تعریف سازگاری اندروید 8.1

1. مقدمه

این سند شرایطی را که باید برای سازگاری دستگاه‌ها با Android 8.1 رعایت شود، برشمرده است.

استفاده از "باید"، "نباید"، "لازم"، "باید"، "نباید"، "باید"، "نباید"، "توصیه شده"، "ممکن است" و "اختیاری" طبق IETF است. استاندارد تعریف شده در RFC2119 .

همانطور که در این سند استفاده می‌شود، «پیاده‌کننده دستگاه» یا «اجراکننده» شخص یا سازمانی است که راه‌حل سخت‌افزار/نرم‌افزاری را با Android 8.1 توسعه می‌دهد. "پیاده سازی دستگاه" یا "پیاده سازی راه حل سخت افزاری/نرم افزاری است که به این شکل توسعه یافته است.

برای اینکه پیاده‌سازی‌های دستگاه با Android 8.1 سازگار در نظر گرفته شوند، باید الزامات ارائه‌شده در این تعریف سازگاری، از جمله هر سندی که از طریق مرجع گنجانده شده‌اند، داشته باشند.

در مواردی که این تعریف یا تست‌های نرم‌افزاری توضیح داده شده در بخش 10 بی‌صدا، مبهم یا ناقص باشد، این مسئولیت اجرای دستگاه است که از سازگاری با پیاده‌سازی‌های موجود اطمینان حاصل کند.

به همین دلیل، پروژه متن باز اندروید هم مرجع و هم پیاده سازی ترجیحی اندروید است. به اجراکنندگان دستگاه اکیداً توصیه می‌شود که پیاده‌سازی‌های خود را تا حد امکان بر اساس کد منبع «بالادست» موجود در پروژه منبع باز Android قرار دهند. در حالی که برخی از مؤلفه‌ها می‌توانند به صورت فرضی با پیاده‌سازی‌های جایگزین جایگزین شوند، اکیداً توصیه می‌شود که از این رویه پیروی نکنید، زیرا گذراندن آزمون‌های نرم‌افزار به طور قابل‌توجهی دشوارتر می‌شود. این مسئولیت پیاده‌کننده است که از سازگاری کامل رفتاری با پیاده‌سازی استاندارد Android، از جمله و فراتر از مجموعه تست سازگاری اطمینان حاصل کند. در نهایت، توجه داشته باشید که تعویض و اصلاح برخی از اجزا به صراحت توسط این سند ممنوع است.

بسیاری از منابع مرتبط با این سند به طور مستقیم یا غیرمستقیم از Android SDK مشتق شده اند و از نظر عملکردی با اطلاعات موجود در اسناد آن SDK یکسان خواهند بود. در هر موردی که این تعریف سازگاری یا مجموعه تست سازگاری با مستندات SDK مخالف باشد، اسناد SDK معتبر تلقی می‌شوند. هر گونه جزئیات فنی ارائه شده در منابع مرتبط در سراسر این سند با گنجاندن بخشی از این تعریف سازگاری در نظر گرفته می شود.

1.1 ساختار سند

1.1.1. الزامات بر اساس نوع دستگاه

بخش 2 شامل تمام الزامات ضروری و قویاً توصیه شده است که برای یک نوع دستگاه خاص اعمال می شود. هر بخش فرعی از بخش 2 به نوع خاصی از دستگاه اختصاص دارد.

تمام الزامات دیگر، که به طور جهانی برای هر پیاده سازی دستگاه Android اعمال می شود، در بخش های بعد از بخش 2 فهرست شده است. این الزامات به عنوان "نیازهای اصلی" در این سند ذکر شده است.

1.1.2. شناسه مورد نیاز

شناسه مورد نیاز برای الزامات MUST اختصاص داده شده است.

• شناسه فقط برای الزامات MUST اختصاص داده شده است.
• الزامات STRONGLY RECOMMENDED به عنوان [SR] علامت گذاری شده اند اما شناسه اختصاص داده نشده است.
• شناسه شامل موارد زیر است: شناسه نوع دستگاه - شناسه وضعیت - شناسه مورد نیاز (به عنوان مثال C-0-1).

هر شناسه به صورت زیر تعریف می شود:

• شناسه نوع دستگاه (بیشتر در 2. انواع دستگاه مراجعه کنید
  • C: Core (الزاماتی که برای اجرای هر دستگاه Android اعمال می شود)
  • H: دستگاه Android Handheld
  • T: دستگاه Android TV
  • A: پیاده سازی Android Automotive
• شناسه شرایط
  • هنگامی که شرط بدون قید و شرط باشد، این شناسه به عنوان 0 تنظیم می شود.
  • وقتی شرط شرطی است، 1 برای شرط اول اختصاص داده می شود و عدد در همان بخش و همان نوع دستگاه، 1 افزایش می یابد.
• شناسه مورد نیاز
  • این شناسه از 1 شروع می شود و در همان بخش و شرایط یکسان 1 افزایش می یابد.

2. انواع دستگاه

در حالی که پروژه منبع باز Android یک پشته نرم افزاری را ارائه می دهد که می تواند برای انواع مختلف دستگاه ها و فاکتورهای شکل استفاده شود، چند نوع دستگاه وجود دارد که اکوسیستم توزیع برنامه نسبتاً بهتری دارند.

این بخش انواع دستگاه ها و الزامات و توصیه های اضافی قابل اجرا برای هر نوع دستگاه را شرح می دهد.

همه پیاده‌سازی‌های دستگاه Android که در هیچ یک از انواع دستگاه‌های توصیف‌شده قرار نمی‌گیرند، همچنان باید همه الزامات موجود در بخش‌های دیگر این تعریف سازگاری را برآورده کنند.

2.1 تنظیمات دستگاه

برای تفاوت‌های عمده در پیکربندی سخت‌افزار بر اساس نوع دستگاه، الزامات خاص دستگاه را که در این بخش دنبال می‌شود، ببینید.

2.2. الزامات دستی

دستگاه Android Handheld به یک پیاده سازی دستگاه اندرویدی اشاره دارد که معمولاً با نگه داشتن آن در دست استفاده می شود، مانند پخش کننده mp3، تلفن یا تبلت.

پیاده‌سازی‌های دستگاه اندروید در صورتی که تمام معیارهای زیر را داشته باشند به عنوان دستی طبقه‌بندی می‌شوند:

• منبع تغذیه ای داشته باشید که تحرک را فراهم می کند، مانند باتری.
• اندازه صفحه نمایش مورب فیزیکی در محدوده 2.5 تا 8 اینچ داشته باشید.

الزامات اضافی در بقیه این بخش مختص پیاده سازی دستگاه Android Handheld است.

2.2.1. سخت افزار

اندازه صفحه (بخش 7.1.1.1)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید صفحه نمایش حداقل 2.5 اینچ در اندازه مورب فیزیکی داشته باشد. ^*

تراکم صفحه (بخش 7.1.1.3)

پیاده سازی دستگاه های دستی:

• [H-SR] اکیداً توصیه می شود تا به کاربران امکان تغییر اندازه نمایشگر را فراهم کنند.

حالت سازگاری برنامه قدیمی (بخش 7.1.5)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید شامل پشتیبانی از حالت سازگاری برنامه های قدیمی همانطور که توسط کد منبع باز بالادستی Android پیاده سازی شده باشد. به این معنا که پیاده‌سازی دستگاه نباید محرک‌ها یا آستانه‌هایی را که در آن حالت سازگاری فعال می‌شود، تغییر دهند، و نباید رفتار خود حالت سازگاری را تغییر دهند.

صفحه کلید (بخش 7.2.1)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید شامل پشتیبانی از برنامه های کاربردی ویرایشگر روش ورودی (IME) شخص ثالث باشد.

کلیدهای پیمایش (بخش 7.2.3)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید عملکردهای Home، Recents و Back را ارائه دهد.

• [H-0-2] باید هر دو رویداد فشار عادی و طولانی عملکرد برگشت ( KEYCODE_BACK ) را به برنامه پیش زمینه ارسال کند.

ورودی صفحه لمسی (بخش 7.2.4)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید از ورودی صفحه لمسی پشتیبانی کند.

شتاب سنج (بخش 7.3.1)

پیاده سازی دستگاه های دستی:

• [H-SR] اکیداً توصیه می‌شود که شتاب‌سنج 3 محوره داشته باشند.

اگر پیاده سازی های دستگاه دستی شامل شتاب سنج 3 محوره باشد، آنها:

• [H-1-1] باید بتواند رویدادها را تا فرکانس حداقل 100 هرتز گزارش کند.

ژیروسکوپ (بخش 7.3.4)

اگر پیاده سازی های دستگاه دستی شامل ژیروسکوپ باشد، آنها:

• [H-1-1] باید بتواند رویدادها را تا فرکانس حداقل 100 هرتز گزارش کند.

سنسور مجاورت (بخش 7.3.8)

پیاده سازی های دستگاه دستی که می توانند تماس صوتی برقرار کنند و هر مقداری غیر از PHONE_TYPE_NONE را در getPhoneType :

• باید دارای سنسور مجاورت باشد.

سنسور پوس (بخش 7.3.12)

پیاده سازی دستگاه های دستی:

• برای پشتیبانی از سنسور پوز با 6 درجه آزادی توصیه می شود.

بلوتوث (بخش 7.4.3)

پیاده سازی دستگاه های دستی:

• باید شامل پشتیبانی از بلوتوث و بلوتوث LE باشد.

ذخیره داده (بخش 7.4.7)

اگر پیاده سازی های دستگاه دستی شامل یک اتصال اندازه گیری شده باشد، آنها:

• [H-1-1] باید حالت ذخیره داده را ارائه دهد.

حداقل حافظه و ذخیره سازی (بخش 7.6.1)

اگر پیاده‌سازی‌های دستگاه دستی فقط از ABI 32 بیتی پشتیبانی می‌کنند:

• [H-1-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 416 مگابایت باشد اگر صفحه نمایش پیش فرض از وضوح فریم بافر تا qHD (مثلا FWVGA) استفاده می کند.

• [H-2-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 592 مگابایت باشد اگر نمایشگر پیش‌فرض از وضوح فریم بافر تا HD+ استفاده می‌کند (مثلاً HD، WSVGA).

• [H-3-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 896 مگابایت باشد اگر صفحه نمایش پیش فرض از وضوح فریم بافر تا FHD استفاده می کند (به عنوان مثال WSXGA+).

• [H-4-1] اگر صفحه نمایش پیش فرض از وضوح فریم بافر تا QHD (مثلا QWXGA) استفاده می کند، حافظه موجود برای هسته و فضای کاربر باید حداقل 1344 مگابایت باشد.

اگر پیاده سازی های دستگاه دستی پشتیبانی از ABI های 32 بیتی و 64 بیتی را اعلام کنند:

• [H-5-1] اگر صفحه نمایش پیش فرض از وضوح فریم بافر تا qHD (مثلا FWVGA) استفاده می کند، حافظه موجود برای هسته و فضای کاربر باید حداقل 816 مگابایت باشد.

• [H-6-1] اگر نمایشگر پیش‌فرض از وضوح فریم‌بافر تا HD+ استفاده می‌کند (مثلاً HD، WSVGA)، حافظه موجود برای هسته و فضای کاربر باید حداقل 944 مگابایت باشد.

• [H-7-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 1280 مگابایت باشد اگر صفحه نمایش پیش فرض از وضوح فریم بافر تا FHD استفاده می کند (به عنوان مثال WSXGA+).

• [H-8-1] حافظه موجود برای هسته و فضای کاربر باید حداقل 1824 مگابایت باشد اگر صفحه نمایش پیش فرض از وضوح فریم بافر تا QHD (مثلا QWXGA) استفاده می کند.

توجه داشته باشید که "حافظه در دسترس برای هسته و فضای کاربر" در بالا به فضای حافظه ارائه شده به اضافه هر حافظه ای که قبلاً به اجزای سخت افزاری مانند رادیو، ویدئو و غیره اختصاص داده شده است که در پیاده سازی های دستگاه تحت کنترل هسته نیستند، اشاره دارد.

اگر پیاده‌سازی‌های دستگاه دستی شامل کمتر یا مساوی 1 گیگابایت حافظه در دسترس هسته و فضای کاربر باشد، آنها:

• [H-9-1] باید پرچم ویژگی android.hardware.ram.low را اعلام کند.
• [H-9-2] باید حداقل 1.1 گیگابایت فضای ذخیره سازی غیر فرار برای داده های خصوصی برنامه (معروف به پارتیشن "/data") داشته باشد.

اگر پیاده سازی های دستگاه دستی شامل بیش از 1 گیگابایت حافظه در دسترس هسته و فضای کاربر باشد، آنها:

• [H-10-1] باید حداقل 4 گیگابایت فضای ذخیره سازی غیر فرار برای داده های خصوصی برنامه (معروف به پارتیشن "/data") در دسترس باشد.
• باید پرچم ویژگی android.hardware.ram.normal را اعلام کند.

فضای ذخیره سازی مشترک برنامه (بخش 7.6.2)

پیاده سازی دستگاه های دستی:

• [H-0-1] نباید فضای ذخیره سازی مشترک برنامه کوچکتر از 1 گیگابایت ارائه کند.

حالت جانبی USB (بخش 7.7.1)

پیاده سازی دستگاه های دستی:

• باید دارای یک پورت USB باشد که از حالت جانبی پشتیبانی می کند.

اگر پیاده سازی های دستگاه دستی شامل یک پورت USB باشد که از حالت جانبی پشتیبانی می کند، آنها:

• [H-1-1] باید API Android Open Accessory (AOA) را پیاده سازی کند. ^*

میکروفون (بخش 7.8.1)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید دارای میکروفون باشد.

خروجی صدا (بخش 7.8.2)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید یک خروجی صدا داشته باشد و android.hardware.audio.output را اعلام کند.

حالت واقعیت مجازی (بخش 7.9.1)

اگر پیاده سازی های دستگاه دستی شامل پشتیبانی از حالت VR باشد، آنها:

• [H-1-1] باید ویژگی android.software.vr.mode را اعلام کند. ^*

اگر پیاده سازی های دستگاه ویژگی android.software.vr.mode را اعلام کنند، آنها:

• [H-2-1] باید شامل برنامه ای باشد که android.service.vr.VrListenerService را اجرا می کند که می تواند توسط برنامه های VR از طریق android.app.Activity#setVrModeEnabled شود. ^*

عملکرد بالای واقعیت مجازی (بخش 7.9.2)

اگر پیاده‌سازی‌های دستگاه دستی قادر به برآورده کردن همه الزامات برای اعلام پرچم ویژگی android.hardware.vr.high_performance باشند، آنها:

• [H-1-1] باید پرچم ویژگی android.hardware.vr.high_performance را اعلام کند. ^*

2.2.2. چند رسانه ای

رمزگذاری صدا (بخش 5.1.1)

پیاده سازی دستگاه دستی باید از رمزگذاری صوتی زیر پشتیبانی کند:

• [H-0-1] AMR-NB
• [H-0-2] AMR-WB
• [H-0-3] نمایه AAC MPEG-4 (AAC LC)
• [H-0-4] نمایه MPEG-4 HE AAC (AAC+)
• [H-0-5] AAC ELD (AAC تاخیر کم تقویت شده)

رمزگشایی صدا (بخش 5.1.2)

پیاده سازی دستگاه دستی باید از رمزگشایی صوتی زیر پشتیبانی کند:

• [H-0-1] AMR-NB
• [H-0-2] AMR-WB

رمزگذاری ویدیو (بخش 5.2)

پیاده سازی دستگاه های دستی باید از رمزگذاری ویدیوی زیر پشتیبانی کند و آن را برای برنامه های شخص ثالث در دسترس قرار دهد:

• [H-0-1] H.264 AVC
• [H-0-2] VP8

رمزگشایی ویدیو (بخش 5.3)

پیاده سازی دستگاه های دستی باید از رمزگشایی ویدیوی زیر پشتیبانی کند:

• [H-0-1] H.264 AVC.
• [H-0-2] H.265 HEVC.
• [H-0-3] MPEG-4 SP.
• [H-0-4] VP8.
• [H-0-5] VP9.

2.2.3. نرم افزار

سازگاری WebView (بخش 3.4.1)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید یک پیاده سازی کامل از android.webkit.Webview API ارائه دهد.

سازگاری مرورگر (بخش 3.4.2)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید شامل یک برنامه مرورگر مستقل برای مرور وب کاربران عمومی باشد.

لانچر (بخش 3.8.1)

پیاده سازی دستگاه های دستی:

• [H-SR] برای پیاده‌سازی یک راه‌انداز پیش‌فرض که از پین کردن میان‌برها و ویجت‌ها در برنامه پشتیبانی می‌کند، اکیداً توصیه می‌شود.

• [H-SR] برای پیاده‌سازی یک راه‌انداز پیش‌فرض که دسترسی سریع به میانبرهای اضافی ارائه‌شده توسط برنامه‌های شخص ثالث را از طریق ShortcutManager API فراهم می‌کند، اکیداً توصیه می‌شود.

• [H-SR] اکیداً توصیه می‌شود یک برنامه راه‌انداز پیش‌فرض که نشان‌هایی را برای نمادهای برنامه نشان می‌دهد، داشته باشند.

ابزارک ها (بخش 3.8.2)

پیاده سازی دستگاه های دستی:

• [H-SR] برای پشتیبانی از ویجت های برنامه شخص ثالث به شدت توصیه می شود.

اطلاعیه ها (بخش 3.8.3)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید به برنامه های شخص ثالث اجازه دهد تا از طریق کلاس های Notification و NotificationManager API کاربران را از رویدادهای قابل توجه مطلع کنند.
• [H-0-2] باید از اعلان های غنی پشتیبانی کند.
• [H-0-3] باید از اعلان‌های heads-up پشتیبانی کند.
• [H-0-4] باید شامل یک سایه اعلان باشد، که به کاربر امکان کنترل مستقیم (مثلاً پاسخ، به تعویق انداختن، رد کردن، مسدود کردن) اعلان‌ها را از طریق هزینه‌های کاربر مانند دکمه‌های عمل یا پانل کنترل که در AOSP اجرا می‌شود، می‌دهد.

جستجو (بخش 3.8.4)

پیاده سازی دستگاه های دستی:

• [H-SR] اکیداً توصیه می‌شود یک دستیار را روی دستگاه اجرا کنید تا عمل Assist را انجام دهد .

کنترل رسانه قفل صفحه (بخش 3.8.10)

اگر پیاده‌سازی‌های دستگاه Android Handheld از صفحه قفل پشتیبانی می‌کنند، آنها:

• [H-1-1] باید اعلان‌های صفحه قفل از جمله الگوی اعلان رسانه را نمایش دهد.

مدیریت دستگاه (بخش 3.9)

اگر پیاده سازی های دستگاه دستی از صفحه قفل ایمن پشتیبانی می کنند، آنها:

• [H-1-1] باید طیف کاملی از خط‌مشی‌های مدیریت دستگاه تعریف شده در اسناد Android SDK را اجرا کند.

قابلیت دسترسی (بخش 3.10)

پیاده سازی دستگاه های دستی:

• [H-SR] باید از خدمات دسترسی شخص ثالث پشتیبانی کند.

• [H-SR] اکیداً توصیه می‌شود که سرویس‌های دسترس‌پذیری را در دستگاه از قبل بارگیری کنید که با عملکردهای دسترسی سوئیچ و TalkBack (برای زبان‌هایی که توسط موتور از پیش بارگذاری شده تبدیل متن به گفتار پشتیبانی می‌شوند) که در پروژه منبع باز Talkback ارائه شده است، قابل مقایسه یا بیشتر باشد. .

تبدیل متن به گفتار (بخش 3.11)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید از نصب موتورهای TTS شخص ثالث پشتیبانی کند.

• [H-SR] اکیداً توصیه می‌شود موتور TTS را شامل شود که از زبان‌های موجود در دستگاه پشتیبانی می‌کند.

تنظیمات سریع (بخش 3.13)

پیاده سازی دستگاه های دستی:

• [H-SR] اکیداً توصیه می شود که شامل یک مؤلفه رابط کاربری تنظیمات سریع باشد.

جفت‌سازی دستگاه همراه (بخش 3.15)

اگر پیاده‌سازی‌های دستگاه دستی Android پشتیبانی از FEATURE_BLUETOOTH یا FEATURE_WIFI را اعلام کنند، آنها:

• [H-1-1] باید از ویژگی جفت شدن دستگاه همراه پشتیبانی کند.

2.2.4. عملکرد و قدرت

ثبات تجربه کاربر (بخش 8.1)

برای پیاده سازی دستگاه های دستی:

• [H-0-1] تأخیر فریم ثابت . تأخیر ناسازگار فریم یا تأخیر در ارائه فریم‌ها نباید بیشتر از 5 فریم در ثانیه اتفاق بیفتد و باید کمتر از 1 فریم در ثانیه باشد.
• [H-0-2] تأخیر رابط کاربری . پیاده‌سازی‌های دستگاه باید با پیمایش فهرستی از 10 هزار ورودی فهرست که توسط مجموعه تست سازگاری Android (CTS) در کمتر از 36 ثانیه تعریف شده است، تجربه کاربر با تأخیر کم را تضمین کنند.
• [H-0-3] تعویض وظیفه . هنگامی که چندین برنامه راه اندازی شده اند، راه اندازی مجدد یک برنامه از قبل در حال اجرا پس از راه اندازی باید کمتر از 1 ثانیه طول بکشد.

عملکرد دسترسی به فایل ورودی/خروجی (بخش 8.2)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید از عملکرد نوشتن متوالی حداقل 5 مگابایت بر ثانیه اطمینان حاصل کند.
• [H-0-2] باید از عملکرد نوشتن تصادفی حداقل 0.5 مگابایت بر ثانیه اطمینان حاصل کند.
• [H-0-3] باید عملکرد خواندن متوالی حداقل 15 مگابایت بر ثانیه را تضمین کند.
• [H-0-4] باید از عملکرد خواندن تصادفی حداقل 3.5 مگابایت بر ثانیه اطمینان حاصل کند.

حالت‌های ذخیره انرژی (بخش 8.3)

برای پیاده سازی دستگاه های دستی:

• [H-0-1] همه برنامه‌های مستثنی شده از حالت‌های ذخیره انرژی برنامه Standby و Doze باید برای کاربر نهایی قابل مشاهده باشند.
• [H-0-2] الگوریتم‌های راه‌اندازی، نگهداری، بیداری و استفاده از تنظیمات سیستم جهانی حالت‌های ذخیره انرژی App Standby و Doze نباید از پروژه منبع باز Android منحرف شود.

حسابداری مصرف برق (بخش 8.4)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید یک نمایه برق برای هر جزء ارائه کند که مقدار مصرف فعلی را برای هر جزء سخت افزاری و تخلیه تقریبی باتری ناشی از قطعات در طول زمان، همانطور که در سایت پروژه منبع باز Android مستند شده است، تعریف کند.
• [H-0-2] باید تمام مقادیر مصرف برق را بر حسب میلی آمپر ساعت (mAh) گزارش کند.
• [H-0-3] باید مصرف انرژی CPU را برای هر UID فرآیند گزارش کند. پروژه منبع باز Android از طریق اجرای ماژول هسته uid_cputime این نیاز را برآورده می کند.
• [H-0-4] باید این مصرف انرژی را از طریق دستور adb shell dumpsys batterystats shell در اختیار توسعه‌دهنده برنامه قرار دهد.
• اگر نمی‌توان مصرف برق جزء سخت‌افزاری را به یک برنامه کاربردی نسبت داد، باید به خود مؤلفه سخت‌افزار نسبت داده شود.

اگر پیاده سازی های دستگاه دستی شامل یک صفحه نمایش یا خروجی ویدیو باشد، آنها:

• [H-1-1] باید به قصد android.intent.action.POWER_USAGE_SUMMARY احترام بگذارد و منوی تنظیماتی را نمایش دهد که این میزان مصرف انرژی را نشان می دهد.

2.2.5. مدل امنیتی

مجوزها (بخش 9.1)

پیاده سازی دستگاه های دستی:

• [H-0-1] باید به برنامه های شخص ثالث اجازه دهد تا از طریق مجوز android.permission.PACKAGE_USAGE_STATS به آمار استفاده دسترسی داشته باشند و مکانیزمی در دسترس کاربر برای اعطا یا لغو دسترسی به چنین برنامه هایی در پاسخ به android.settings.ACTION_USAGE_ACCESS_SETTINGS ارائه دهند.ACTION_USAGE_ACCESS_SETTINGS قصد

2.3. الزامات تلویزیون

دستگاه Android Television به یک پیاده‌سازی دستگاه Android اشاره دارد که یک رابط سرگرمی برای مصرف رسانه‌های دیجیتال، فیلم‌ها، بازی‌ها، برنامه‌ها و/یا تلویزیون زنده برای کاربرانی است که حدود ده فوت دورتر می‌نشینند (یک کاربر «کم پشت» یا «کاربر 10 فوتی» رابط").

پیاده‌سازی‌های دستگاه اندروید در صورتی به عنوان تلویزیون طبقه‌بندی می‌شوند که تمام معیارهای زیر را داشته باشند:

• مکانیزمی برای کنترل از راه دور رابط کاربری رندر شده بر روی صفحه نمایشی که ممکن است ده فوت دورتر از کاربر قرار گیرد، ارائه کرده اند.
• یک صفحه نمایش تعبیه شده با طول مورب بزرگتر از 24 اینچ داشته باشید یا دارای یک پورت خروجی ویدئو مانند VGA، HDMI، DisplayPort یا یک پورت بی سیم برای نمایش باشد.

الزامات اضافی در بقیه این بخش مربوط به پیاده سازی دستگاه تلویزیون Android است.

2.3.1. سخت افزار

ناوبری بدون لمس (بخش 7.2.2)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید از D-pad پشتیبانی کند.

کلیدهای پیمایش (بخش 7.2.3)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید عملکردهای Home و Back را ارائه دهد.
• [T-0-2] باید هر دو رویداد فشار عادی و طولانی عملکرد برگشت ( KEYCODE_BACK ) را به برنامه پیش زمینه ارسال کند.

نگاشت دکمه ها (بخش 7.2.6.1)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید شامل پشتیبانی از کنترلرهای بازی باشد و پرچم ویژگی android.hardware.gamepad را اعلام کند.

کنترل از راه دور (بخش 7.2.7)

پیاده سازی دستگاه های تلویزیونی:

• باید یک کنترل از راه دور فراهم کند که از طریق آن کاربران بتوانند به ورودی های ناوبری غیر لمسی و کلیدهای ناوبری اصلی دسترسی داشته باشند.

ژیروسکوپ (بخش 7.3.4)

اگر پیاده سازی های دستگاه تلویزیون شامل ژیروسکوپ باشد، آنها:

• [T-1-1] باید بتواند رویدادها را تا فرکانس حداقل 100 هرتز گزارش کند.

بلوتوث (بخش 7.4.3)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید از بلوتوث و بلوتوث LE پشتیبانی کند.

حداقل حافظه و ذخیره سازی (بخش 7.6.1)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید حداقل 4 گیگابایت فضای ذخیره سازی غیر فرار برای داده های خصوصی برنامه (معروف به پارتیشن "/data") در دسترس باشد.
• [T-0-2] باید برای ActivityManager.isLowRamDevice() "true" را زمانی که کمتر از 1 گیگابایت حافظه در دسترس هسته و فضای کاربر وجود دارد، بازگرداند.

میکروفون (بخش 7.8.1)

پیاده سازی دستگاه های تلویزیونی:

• باید دارای میکروفون باشد.

خروجی صدا (بخش 7.8.2)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید یک خروجی صدا داشته باشد و android.hardware.audio.output را اعلام کند.

2.3.2. چند رسانه ای

رمزگذاری صدا (بخش 5.1)

پیاده سازی دستگاه های تلویزیونی باید از رمزگذاری صوتی زیر پشتیبانی کند:

• [T-0-1] نمایه AAC MPEG-4 (AAC LC)
• [T-0-2] نمایه MPEG-4 HE AAC (AAC+)
• [T-0-3] AAC ELD (AAC تاخیر کم تقویت شده)

رمزگذاری ویدیو (بخش 5.2)

پیاده سازی دستگاه های تلویزیونی باید از رمزگذاری ویدیوی زیر پشتیبانی کند:

• [T-0-1] H.264 AVC
• [T-0-2] VP8

H-264 (بخش 5.2.2)

پیاده سازی دستگاه تلویزیون عبارتند از:

• [T-SR] قویاً برای پشتیبانی از کدگذاری H.264 ویدیوهای با وضوح 720p و 1080p توصیه می شود.
• [T-SR] قویاً برای پشتیبانی از کدگذاری H.264 ویدیویی با وضوح 1080p با سرعت 30 فریم در ثانیه (فریم بر ثانیه) توصیه می‌شود.

رمزگشایی ویدیو (بخش 5.3)

پیاده سازی دستگاه های تلویزیونی باید از رمزگشایی ویدیوی زیر پشتیبانی کند:

• [T-0-1] H.264 AVC
• [T-0-2] H.265 HEVC
• [T-0-3] MPEG-4 SP
• [T-0-4] VP8
• [T-0-5] VP9

اجرای دستگاه های تلویزیونی برای پشتیبانی از رمزگشایی ویدیوی زیر به شدت توصیه می شود:

• [T-SR] MPEG-2

H.264 (بخش 5.3.4)

اگر پیاده‌سازی‌های دستگاه تلویزیونی از رمزگشاهای H.264 پشتیبانی می‌کنند، آنها:

• [T-1-1] باید از نمایه سطح بالای 4.2 و نمایه رمزگشایی HD 1080p (با سرعت 60 فریم در ثانیه) پشتیبانی کند.
• [T-1-2] باید بتواند ویدیوها را با هر دو نمایه HD همانطور که در جدول زیر نشان داده شده است رمزگشایی کند و با نمایه خط پایه، نمایه اصلی یا سطح نمایه بالا 4.2 رمزگذاری شده باشد.

H.265 (HEVC) (بخش 5.3.5)

اگر پیاده‌سازی‌های دستگاه تلویزیون از کدک H.265 و نمایه رمزگشایی HD 1080p پشتیبانی می‌کنند، آنها:

• [T-1-1] باید از نمایه اصلی سطح 4.1 لایه اصلی پشتیبانی کند.
• [T-SR] برای پشتیبانی از نرخ فریم ویدیویی 60 فریم در ثانیه برای HD 1080p به شدت توصیه می شود.

اگر پیاده‌سازی‌های دستگاه تلویزیون از کدک H.265 و نمایه رمزگشایی UHD پشتیبانی می‌کنند، پس:

• [T-2-1] کدک باید از نمایه لایه اصلی Main10 Level 5 پشتیبانی کند.

VP8 (بخش 5.3.6)

اگر پیاده سازی های دستگاه تلویزیون از کدک VP8 پشتیبانی می کنند، آنها:

• [T-1-1] باید از نمایه رمزگشایی HD 1080p60 پشتیبانی کند.

اگر پیاده‌سازی‌های دستگاه تلویزیون از کدک VP8 و 720p پشتیبانی می‌کنند، آنها:

• [T-2-1] باید از نمایه رمزگشایی HD 720p60 پشتیبانی کند.

VP9 (بخش 5.3.7)

اگر پیاده‌سازی‌های دستگاه تلویزیون از کدک VP9 و رمزگشایی ویدیوی UHD پشتیبانی می‌کنند، آنها:

• [T-1-1] باید از عمق رنگ 8 بیتی پشتیبانی کند و از VP9 Profile 2 (10 بیتی) پشتیبانی کند.

اگر پیاده‌سازی‌های دستگاه تلویزیون از کدک VP9، نمایه 1080p و رمزگشایی سخت‌افزار VP9 پشتیبانی می‌کنند، آنها:

• [T-2-1] باید 60 فریم در ثانیه برای 1080p پشتیبانی کند.

رسانه ایمن (بخش 5.8)

اگر پیاده‌سازی‌های دستگاه دستگاه‌های تلویزیون Android هستند و از وضوح 4K پشتیبانی می‌کنند، آنها:

• [T-1-1] باید از HDCP 2.2 برای همه نمایشگرهای خارجی سیمی پشتیبانی کند.

اگر پیاده‌سازی‌های دستگاه تلویزیون از وضوح 4K پشتیبانی نمی‌کنند، آنها:

• [T-2-1] باید از HDCP 1.4 برای همه نمایشگرهای خارجی سیمی پشتیبانی کند.

پیاده سازی دستگاه های تلویزیونی:

• [T-SR] برای پشتیبانی از رمزگشایی همزمان جریان های امن به شدت توصیه می شود. حداقل، رمزگشایی همزمان دو بخار به شدت توصیه می شود.

میزان صدای خروجی صدا (بخش 5.5.3)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید شامل پشتیبانی از صدای اصلی سیستم و کاهش صدای خروجی دیجیتال در خروجی‌های پشتیبانی‌شده باشد، به جز خروجی‌های عبوری صوتی فشرده (جایی که رمزگشایی صدا در دستگاه انجام نمی‌شود).

2.3.3. نرم افزار

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید ویژگی های android.software.leanback و android.hardware.type.television را اعلام کند.

سازگاری WebView (بخش 3.4.1)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید یک پیاده سازی کامل از android.webkit.Webview API ارائه دهد.

کنترل رسانه قفل صفحه (بخش 3.8.10)

اگر پیاده سازی های دستگاه Android TV از صفحه قفل پشتیبانی می کنند، آنها:

• [T-1-1] باید اعلان‌های صفحه قفل از جمله الگوی اعلان رسانه را نمایش دهد.

چند پنجره (بخش 3.8.14)

پیاده سازی دستگاه های تلویزیونی:

• [T-SR] برای پشتیبانی از حالت چند پنجره ای حالت تصویر در تصویر (PIP) اکیداً توصیه می شود.

قابلیت دسترسی (بخش 3.10)

پیاده سازی دستگاه های تلویزیونی:

• [T-SR] باید از خدمات دسترسی شخص ثالث پشتیبانی کند.

• [T-SR] پیاده‌سازی‌های دستگاه Android TV قویاً توصیه می‌شود که خدمات دسترس‌پذیری را در دستگاه از قبل بارگیری کنند که با عملکردهای دسترسی سوئیچ و TalkBack (برای زبان‌هایی که توسط موتور از پیش بارگذاری شده تبدیل متن به گفتار پشتیبانی می‌شوند) قابل مقایسه یا فراتر از آن است. پروژه منبع باز تاک بک

تبدیل متن به گفتار (بخش 3.11)

اگر پیاده‌سازی‌های دستگاه ویژگی android.hardware.audio.output را گزارش کنند، آنها:

• [T-SR] اکیداً توصیه می‌شود موتور TTS را شامل شود که از زبان‌های موجود در دستگاه پشتیبانی می‌کند.

• [T-0-1] باید از نصب موتورهای TTS شخص ثالث پشتیبانی کند.

چارچوب ورودی تلویزیون (بخش 3.12)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید از چارچوب ورودی تلویزیون پشتیبانی کند.

2.2.4. عملکرد و قدرت

ثبات تجربه کاربر (بخش 8.1)

برای پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] تأخیر فریم ثابت . تأخیر ناسازگار فریم یا تأخیر در ارائه فریم‌ها نباید بیشتر از 5 فریم در ثانیه اتفاق بیفتد و باید کمتر از 1 فریم در ثانیه باشد.

عملکرد دسترسی به فایل ورودی/خروجی (بخش 8.2)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید عملکرد نوشتن متوالی حداقل 5 مگابایت بر ثانیه را تضمین کند.
• [T-0-2] باید از عملکرد نوشتن تصادفی حداقل 0.5 مگابایت بر ثانیه اطمینان حاصل کند.
• [T-0-3] باید عملکرد خواندن متوالی حداقل 15 مگابایت بر ثانیه را تضمین کند.
• [T-0-4] باید از عملکرد خواندن تصادفی حداقل 3.5 مگابایت بر ثانیه اطمینان حاصل کند.

حالت‌های ذخیره انرژی (بخش 8.3)

برای پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] همه برنامه‌های مستثنی شده از حالت‌های ذخیره انرژی برنامه Standby و Doze باید برای کاربر نهایی قابل مشاهده باشند.
• [T-0-2] الگوریتم‌های راه‌اندازی، نگهداری، بیداری و استفاده از تنظیمات سیستم جهانی حالت‌های ذخیره انرژی App Standby و Doze نباید از پروژه منبع باز Android منحرف شود.

حسابداری مصرف برق (بخش 8.4)

پیاده سازی دستگاه های تلویزیونی:

• [T-0-1] باید یک نمایه قدرت برای هر جزء ارائه کند که مقدار مصرف فعلی را برای هر جزء سخت افزاری و تخلیه تقریبی باتری ناشی از قطعات در طول زمان، همانطور که در سایت پروژه منبع باز Android مستند شده است، تعریف کند.
• [T-0-2] باید تمام مقادیر مصرف برق را بر حسب میلی آمپر ساعت (mAh) گزارش کند.
• [T-0-3] باید مصرف انرژی CPU را برای هر UID فرآیند گزارش کند. پروژه منبع باز Android از طریق اجرای ماژول هسته uid_cputime این نیاز را برآورده می کند.
• اگر نمی‌توان مصرف برق جزء سخت‌افزاری را به یک برنامه کاربردی نسبت داد، باید به خود مؤلفه سخت‌افزار نسبت داده شود.
• [T-0-4] باید این مصرف انرژی را از طریق دستور adb shell dumpsys batterystats shell در اختیار توسعه‌دهنده برنامه قرار دهد.

2.4. الزامات ساعت

دستگاه Android Watch به یک دستگاه اندرویدی اشاره دارد که برای پوشیدن روی بدن، شاید روی مچ قرار دارد.

پیاده‌سازی‌های دستگاه اندروید در صورتی به عنوان Watch طبقه‌بندی می‌شوند که تمام معیارهای زیر را داشته باشند:

• صفحه نمایشی با طول مورب فیزیکی در محدوده 1.1 تا 2.5 اینچ داشته باشید.
• مکانیزمی برای پوشیدن روی بدن ارائه دهید.

الزامات اضافی در بقیه این بخش مربوط به پیاده سازی دستگاه Android Watch است.

2.4.1. سخت افزار

اندازه صفحه (بخش 7.1.1.1)

اجراهای دستگاه را تماشا کنید:

• [W-0-1] باید صفحه نمایشی با اندازه مورب فیزیکی در محدوده 1.1 تا 2.5 اینچ داشته باشد.

کلیدهای پیمایش (بخش 7.2.3)

اجراهای دستگاه را تماشا کنید:

• [W-0-1] باید تابع Home در دسترس کاربر باشد، و تابع Back به جز زمانی که در UI_MODE_TYPE_WATCH است.

ورودی صفحه لمسی (بخش 7.2.4)

اجراهای دستگاه را تماشا کنید:

• [W-0-2] باید از ورودی صفحه لمسی پشتیبانی کند.

شتاب سنج (بخش 7.3.1)

اجراهای دستگاه را تماشا کنید:

• [W-SR] اکیداً توصیه می‌شود که شتاب‌سنج 3 محوره داشته باشند.

بلوتوث (بخش 7.4.3)

اجراهای دستگاه را تماشا کنید:

• [W-0-1] باید از بلوتوث پشتیبانی کند.

حداقل حافظه و ذخیره سازی (بخش 7.6.1)

اجراهای دستگاه را تماشا کنید:

• [W-0-1] باید حداقل 1 گیگابایت فضای ذخیره سازی غیر فرار برای داده های خصوصی برنامه (معروف به پارتیشن "/data") در دسترس باشد.
• [W-0-2] باید حداقل 416 مگابایت حافظه در دسترس هسته و فضای کاربر داشته باشد.

میکروفون (بخش 7.8.1)

اجراهای دستگاه را تماشا کنید:

• [W-0-1] باید دارای میکروفون باشد.

خروجی صدا (بخش 7.8.1)

اجراهای دستگاه را تماشا کنید:

• ممکن است اما نباید خروجی صدا داشته باشد.

2.4.2. چند رسانه ای

بدون نیاز اضافی

2.4.3. نرم افزار

اجراهای دستگاه را تماشا کنید:

• [W-0-1] باید ویژگی android.hardware.type.watch را اعلام کند.
• [W-0-2] باید از uiMode = UI_MODE_TYPE_WATCH پشتیبانی کند.

جستجو (بخش 3.8.4)

اجراهای دستگاه را تماشا کنید:

• [W-SR] اکیداً توصیه می‌شود که یک دستیار را روی دستگاه اجرا کنید تا عملکرد Assist را مدیریت کند .

قابلیت دسترسی (بخش 3.10)

اجراهای دستگاهی را که پرچم ویژگی android.hardware.audio.output را اعلام می کنند تماشا کنید:

• [W-1-1] باید از خدمات دسترسی شخص ثالث پشتیبانی کند.

• [W-SR] اکیداً توصیه می‌شود که سرویس‌های دسترس‌پذیری را در دستگاه از قبل بارگیری کنند که با عملکردهای دسترسی سوئیچ و TalkBack (برای زبان‌هایی که توسط موتور متن به گفتار از پیش بارگذاری‌شده پشتیبانی می‌شوند) که در پروژه منبع باز Talkback ارائه شده است، قابل مقایسه یا بیشتر باشد. .

تبدیل متن به گفتار (بخش 3.11)

اگر پیاده‌سازی‌های دستگاه Watch ویژگی android.hardware.audio.output را گزارش کنند، آنها:

• [W-SR] اکیداً توصیه می‌شود یک موتور TTS را که از زبان‌های موجود در دستگاه پشتیبانی می‌کند، اضافه کنند.

• [W-0-1] باید از نصب موتورهای TTS شخص ثالث پشتیبانی کند.

2.5. الزامات خودرو

پیاده‌سازی Android Automotive به یک واحد اصلی خودرو اشاره دارد که Android را به عنوان یک سیستم عامل برای بخشی یا تمام سیستم و/یا عملکرد اطلاعات سرگرمی اجرا می‌کند.

پیاده‌سازی‌های دستگاه Android در صورتی به عنوان Automotive طبقه‌بندی می‌شوند که ویژگی android.hardware.type.automotive را داشته باشند یا تمام معیارهای زیر را داشته باشند.

• به عنوان بخشی از یک وسیله نقلیه خودرویی یا قابل اتصال به آن تعبیه شده است.
• از صفحه نمایش در ردیف صندلی راننده به عنوان نمایشگر اصلی استفاده می کنید.

الزامات اضافی در بقیه این بخش مربوط به پیاده سازی دستگاه Android Automotive است.

2.5.1. سخت افزار

اندازه صفحه (بخش 7.1.1.1)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید صفحه نمایش حداقل 6 اینچ در اندازه مورب فیزیکی داشته باشد.
• [A-0-2] باید طرح‌بندی اندازه صفحه حداقل 750 dp x 480 dp داشته باشد.

کلیدهای پیمایش (بخش 7.2.3)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید عملکرد Home را ارائه دهد و ممکن است عملکردهای بازگشت و اخیر را ارائه دهد.
• [A-0-2] باید هر دو رویداد فشار عادی و طولانی عملکرد برگشت ( KEYCODE_BACK ) را به برنامه پیش زمینه ارسال کند.

شتاب سنج (بخش 7.3.1)

پیاده سازی دستگاه خودرو:

• [A-SR] اکیداً توصیه می‌شود شتاب‌سنج 3 محوره داشته باشند.

اگر پیاده سازی های دستگاه خودرو شامل شتاب سنج 3 محوره باشد، آنها:

• [A-1-1] باید بتواند رویدادها را تا فرکانس حداقل 100 هرتز گزارش کند.
• [A-1-2] باید با سیستم مختصات سنسور ماشین Android مطابقت داشته باشد.

GPS (بخش 7.3.3)

اگر پیاده‌سازی‌های دستگاه Automotive شامل گیرنده GPS/GNSS باشد و قابلیت آن را از طریق پرچم ویژگی android.hardware.location.gps به برنامه‌ها گزارش کند:

• [A-1-1] تولید فناوری GNSS باید سال «2017» یا جدیدتر باشد.

ژیروسکوپ (بخش 7.3.4)

اگر پیاده سازی های دستگاه خودرو شامل ژیروسکوپ باشد، آنها:

• [A-1-1] باید بتواند رویدادها را تا فرکانس حداقل 100 هرتز گزارش کند.

سنسورهای فقط Android Automotive (بخش 7.3.11) Current Gear (بخش 7.3.11.1)

پیاده سازی دستگاه خودرو:

• باید دنده فعلی را به عنوان SENSOR_TYPE_GEAR ارائه کند.

حالت روز شب (بخش 7.3.11.2)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید از حالت روز/شب که به عنوان SENSOR_TYPE_NIGHT تعریف شده است پشتیبانی کند.
• [A-0-2] مقدار پرچم SENSOR_TYPE_NIGHT باید با حالت روز/شب داشبورد مطابقت داشته باشد و باید بر اساس ورودی حسگر نور محیط باشد.
• ممکن است حسگر نور محیط زیرین همان Photometer باشد.

وضعیت رانندگی (بخش 7.3.11.3)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید از وضعیت رانندگی که به‌عنوان SENSOR_TYPE_DRIVING_STATUS تعریف شده است، با مقدار پیش‌فرض DRIVE_STATUS_UNRESTRICTED زمانی که وسیله نقلیه کاملاً متوقف و پارک شده است، پشتیبانی کند. مسئولیت پیکربندی SENSOR_TYPE_DRIVING_STATUS مطابق با کلیه قوانین و مقررات مربوط به بازارهایی که محصول در آنجا ارسال می شود، بر عهده سازندگان دستگاه است.

سرعت چرخ (بخش 7.3.11.4)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید سرعت وسیله نقلیه تعریف شده به عنوان SENSOR_TYPE_CAR_SPEED را ارائه دهد.

بلوتوث (بخش 7.4.3)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید از بلوتوث پشتیبانی کند و از بلوتوث LE پشتیبانی کند.

• [A-0-2] پیاده‌سازی‌های Android Automotive باید از نمایه‌های بلوتوث زیر پشتیبانی کنند:

  • تماس تلفنی از طریق نمایه هندزفری (HFP).
  • پخش رسانه از طریق نمایه توزیع صوتی (A2DP).
  • کنترل پخش رسانه روی نمایه کنترل از راه دور (AVRCP).
  • اشتراک گذاری تماس با استفاده از نمایه دسترسی دفترچه تلفن (PBAP).
• باید از نمایه دسترسی پیام (MAP) پشتیبانی کند.

حداقل قابلیت شبکه (بخش 7.4.5)

پیاده سازی دستگاه خودرو:

• باید شامل پشتیبانی از اتصال داده مبتنی بر شبکه تلفن همراه باشد.

حداقل حافظه و ذخیره سازی (بخش 7.6.1)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید حداقل 4 گیگابایت فضای ذخیره سازی غیر فرار برای داده های خصوصی برنامه (معروف به پارتیشن "/data") در دسترس باشد.

حالت جانبی USB (بخش 7.7.1)

پیاده سازی دستگاه خودرو:

• باید دارای یک پورت USB باشد که از حالت جانبی پشتیبانی می کند.

میکروفون (بخش 7.8.1)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید دارای میکروفون باشد.

خروجی صدا (بخش 7.8.2)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید یک خروجی صدا داشته باشد و android.hardware.audio.output را اعلام کند.

2.5.2. چند رسانه ای

رمزگذاری صدا (بخش 5.1)

پیاده سازی دستگاه خودرو باید از رمزگذاری صوتی زیر پشتیبانی کند:

• [A-1-1] نمایه AAC MPEG-4 (AAC LC)
• [A-1-2] نمایه MPEG-4 HE AAC (AAC+)
• [A-1-3] AAC ELD (AAC تاخیر کم تقویت شده)

رمزگذاری ویدیو (بخش 5.2)

پیاده سازی دستگاه خودرو باید از رمزگذاری ویدیوی زیر پشتیبانی کند:

• [A-0-1] H.264 AVC
• [A-0-2] VP8

رمزگشایی ویدیو (بخش 5.3)

پیاده سازی دستگاه خودرو باید از رمزگشایی ویدیوی زیر پشتیبانی کند:

• [A-0-1] H.264 AVC
• [A-0-2] MPEG-4 SP
• [A-0-3] VP8
• [A-0-4] VP9

پیاده سازی دستگاه های خودرو برای پشتیبانی از رمزگشایی ویدیوی زیر به شدت توصیه می شود:

• [A-SR] H.265 HEVC

2.5.3. نرم افزار

پیاده سازی دستگاه خودرو:

• [A-0-1] باید ویژگی android.hardware.type.automotive را اعلام کند.
• [A-0-2] باید uiMode = UI_MODE_TYPE_CAR را پشتیبانی کند.
• [A-0-3] پیاده‌سازی‌های Android Automotive باید از همه APIهای عمومی در فضای نام android.car.* پشتیبانی کنند.

سازگاری WebView (بخش 3.4.1)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید یک پیاده سازی کامل از android.webkit.Webview API ارائه دهد.

اطلاعیه ها (بخش 3.8.3)

پیاده سازی دستگاه Android Automotive:

• [A-0-1] باید اعلان‌هایی را که از Notification.CarExtender API استفاده می‌کنند، در صورت درخواست برنامه‌های شخص ثالث نمایش دهد.

جستجو (بخش 3.8.4)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید یک دستیار را روی دستگاه اجرا کند تا عمل Assist را انجام دهد .

رابط کاربری رسانه (بخش 3.14)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید دارای یک چارچوب UI برای پشتیبانی از برنامه های شخص ثالث با استفاده از API های رسانه همانطور که در بخش 3.14 توضیح داده شد، باشد.

2.2.4. عملکرد و قدرت

حالت‌های ذخیره انرژی (بخش 8.3)

برای پیاده سازی دستگاه های خودرو:

• [A-0-1] همه برنامه‌های مستثنی شده از حالت‌های ذخیره انرژی و آماده به کار برنامه و Doze باید برای کاربر نهایی قابل مشاهده باشند.
• [A-0-2] الگوریتم‌های راه‌اندازی، نگهداری، بیداری و استفاده از تنظیمات سیستم جهانی حالت‌های ذخیره انرژی App Standby و Doze نباید از پروژه منبع باز Android منحرف شود.

حسابداری مصرف برق (بخش 8.4)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید یک نمایه برق برای هر جزء ارائه کند که مقدار مصرف فعلی را برای هر جزء سخت افزاری و تخلیه تقریبی باتری ناشی از قطعات در طول زمان، همانطور که در سایت پروژه منبع باز Android مستند شده است، تعریف کند.
• [A-0-2] باید تمام مقادیر مصرف برق را بر حسب میلی آمپر ساعت (mAh) گزارش کند.
• [A-0-3] باید مصرف انرژی CPU را به ازای UID هر فرآیند گزارش کند. پروژه منبع باز Android از طریق اجرای ماژول هسته uid_cputime این نیاز را برآورده می کند.
• اگر نمی‌توان مصرف برق جزء سخت‌افزاری را به یک برنامه کاربردی نسبت داد، باید به خود مؤلفه سخت‌افزار نسبت داده شود.
• [A-0-4] باید این مصرف انرژی را از طریق دستور adb shell dumpsys batterystats shell در اختیار توسعه‌دهنده برنامه قرار دهد.

2.2.5. مدل امنیتی

پشتیبانی چند کاربره (بخش 9.5)

اگر پیاده سازی های دستگاه Automotive شامل چندین کاربر باشد، آنها:

• [A-1-1] باید دارای یک حساب مهمان باشد که به همه عملکردهای ارائه شده توسط سیستم خودرو بدون نیاز به ورود کاربر به سیستم اجازه می دهد.

جداسازی سیستم خودروی خودرو (بخش 9.14)

پیاده سازی دستگاه خودرو:

• [A-0-1] باید پیام‌ها را از زیرسیستم‌های خودرو چارچوب Android نگه دارد، به عنوان مثال، فهرست مجاز انواع پیام و منابع پیام مجاز.
• [A-0-2] باید مراقب حملات انکار سرویس از فریم ورک اندروید یا برنامه های شخص ثالث باشد. این از نرم‌افزارهای مخربی محافظت می‌کند که شبکه خودرو را پر از ترافیک می‌کند، که ممکن است منجر به اختلال در عملکرد زیرسیستم‌های خودرو شود.

2.6. الزامات تبلت

دستگاه تبلت اندروید به یک پیاده سازی دستگاه اندرویدی اطلاق می شود که معمولاً با نگه داشتن در هر دو دست استفاده می شود و نه به صورت تاشو.

پیاده‌سازی‌های دستگاه اندروید در صورتی به عنوان تبلت طبقه‌بندی می‌شوند که تمام معیارهای زیر را داشته باشند:

• منبع تغذیه ای داشته باشید که تحرک را فراهم می کند، مانند باتری.
• اندازه صفحه نمایش مورب فیزیکی در محدوده 7 تا 18 اینچ داشته باشید.

پیاده سازی دستگاه های تبلت دارای الزامات مشابهی با پیاده سازی دستگاه های دستی هستند. استثناها با و * در آن بخش مشخص شده و برای مرجع در این بخش ذکر شده اند.

2.4.1. سخت افزار

اندازه صفحه (بخش 7.1.1.1)

پیاده سازی دستگاه تبلت:

• [Ta-0-1] باید صفحه نمایشی در محدوده 7 تا 18 اینچ داشته باشد.

حداقل حافظه و ذخیره سازی (بخش 7.6.1)

تراکم صفحه نمایش ذکر شده برای صفحه نمایش های کوچک/عادی در الزامات دستی برای تبلت ها قابل اعمال نیست.

حالت جانبی USB (بخش 7.7.1)

اگر پیاده سازی های دستگاه دستی شامل یک پورت USB باشد که از حالت جانبی پشتیبانی می کند، آنها:

• ممکن است API Android Open Accessory (AOA) را پیاده سازی کند.

حالت واقعیت مجازی (بخش 7.9.1)

عملکرد بالای واقعیت مجازی (بخش 7.9.2)

الزامات واقعیت مجازی برای تبلت ها قابل اجرا نیست.

3. نرم افزار

3.1. سازگاری API مدیریت شده

محیط اجرای بایت کد Dalvik مدیریت شده وسیله اولیه برای برنامه های اندروید است. رابط برنامه نویسی برنامه اندروید (API) مجموعه ای از واسط های پلتفرم اندروید است که در معرض برنامه هایی است که در محیط زمان اجرا مدیریت شده اجرا می شوند.

• [C-0-1] پیاده‌سازی‌های دستگاه باید پیاده‌سازی کامل، از جمله تمام رفتارهای مستند، هر API مستندی را که توسط Android SDK یا هر API تزئین شده با نشانگر «@SystemApi» در کد منبع بالادستی Android در معرض دید قرار می‌گیرد، ارائه دهد.

• [C-0-2] پیاده‌سازی‌های دستگاه باید از تمام کلاس‌ها، روش‌ها و عناصر مرتبط مشخص‌شده با حاشیه‌نویسی TestApi (@TestApi) پشتیبانی/حفظ کنند.

• [C-0-3] پیاده‌سازی‌های دستگاه نباید هیچ‌یک از APIهای مدیریت شده را حذف کنند، رابط‌ها یا امضاهای API را تغییر دهند، از رفتار مستند منحرف شوند، یا شامل موارد بدون عملیات باشند، مگر در مواردی که به طور خاص توسط این تعریف سازگاری مجاز است.

• [C-0-4] پیاده‌سازی‌های دستگاه باید همچنان API‌ها را موجود نگه دارند و به شیوه‌ای معقول رفتار کنند، حتی زمانی که برخی از ویژگی‌های سخت‌افزاری که Android شامل API هستند حذف شده باشند. برای الزامات خاص برای این سناریو به بخش 7 مراجعه کنید.

3.1.1. برنامه های افزودنی اندروید

Android شامل پشتیبانی از گسترش APIهای مدیریت شده در حالی که همان نسخه سطح API را حفظ می کند.

• [C-0-1] پیاده‌سازی‌های دستگاه Android باید اجرای AOSP کتابخانه مشترک ExtShared و خدمات ExtServices را با نسخه‌های بالاتر یا برابر با حداقل نسخه‌های مجاز در هر سطح API از قبل بارگذاری کنند. به عنوان مثال، پیاده‌سازی‌های دستگاه Android 7.0 با اجرای API سطح 24 باید حداقل شامل نسخه 1 باشد.

3.2. سازگاری نرم افزار API

علاوه بر APIهای مدیریت شده از بخش 3.1 ، Android همچنین شامل یک API "نرم" فقط زمان اجرا قابل توجه است، به شکل مواردی مانند intent ها، مجوزها، و جنبه های مشابه برنامه های Android که در زمان کامپایل برنامه قابل اجرا نیستند.

3.2.1. مجوزها

• [C-0-1] پیاده‌کننده‌های دستگاه باید تمام ثابت‌های مجوز را همانطور که در صفحه مرجع مجوز مستند شده است، پشتیبانی و اجرا کنند. توجه داشته باشید که بخش 9 الزامات اضافی مربوط به مدل امنیتی اندروید را فهرست می کند.

3.2.2. ساخت پارامترها

APIهای Android شامل تعدادی ثابت در کلاس android.os.Build هستند که برای توصیف دستگاه فعلی در نظر گرفته شده است.

• [C-0-1] برای ارائه مقادیر منسجم و معنادار در سراسر پیاده‌سازی دستگاه، جدول زیر شامل محدودیت‌های اضافی در قالب‌های این مقادیر است که پیاده‌سازی دستگاه باید با آن‌ها مطابقت داشته باشد.

3.2.3. سازگاری قصد

3.2.3.1. اهداف اصلی برنامه

اهداف Android به اجزای برنامه اجازه می دهد تا عملکرد را از سایر اجزای Android درخواست کنند. پروژه بالادستی اندروید شامل لیستی از برنامه‌های کاربردی است که برنامه‌های اصلی اندروید در نظر گرفته می‌شوند که چندین الگوی هدف را برای انجام اقدامات رایج پیاده‌سازی می‌کنند.

• [C-0-1] پیاده‌سازی‌های دستگاه باید یک یا چند برنامه یا مؤلفه خدمات را با یک کنترل‌کننده هدف، برای همه الگوهای فیلتر هدف عمومی که توسط برنامه‌های اندروید اصلی زیر در AOSP تعریف شده‌اند، از قبل بارگذاری کنند:

  • ساعت رومیزی
  • مرورگر
  • تقویم
  • مخاطب
  • گالری
  • جستجوی جهانی
  • پرتاب کننده
  • موسیقی
  • تنظیمات

3.2.3.2. تفکیک قصد

• [C-0-1] از آنجایی که Android یک پلتفرم توسعه‌پذیر است، پیاده‌سازی‌های دستگاه باید اجازه دهند تا هر الگوی قصد اشاره‌شده در بخش 3.2.3.1 توسط برنامه‌های شخص ثالث لغو شود. اجرای متن باز اندروید بالادست این امکان را به طور پیش فرض می دهد.

• [C-0-2] پیاده‌کننده‌های دستگاه نباید امتیازات ویژه‌ای را برای استفاده برنامه‌های سیستمی از این الگوهای هدف قائل شوند، یا از اتصال برنامه‌های شخص ثالث به این الگوها و کنترل آن‌ها جلوگیری کنند. این ممنوعیت به‌طور خاص شامل غیرفعال کردن رابط کاربری «انتخاب کننده» است که به کاربر اجازه می‌دهد بین چند برنامه‌ای که همگی الگوی هدف یکسانی دارند، انتخاب کند.

• [C-0-3] پیاده‌سازی دستگاه باید یک رابط کاربری برای کاربران فراهم کند تا فعالیت پیش‌فرض را برای intent تغییر دهند.

• با این حال، پیاده‌سازی دستگاه ممکن است فعالیت‌های پیش‌فرض را برای الگوهای URI خاص (به‌عنوان مثال http://play.google.com) ارائه دهد، زمانی که فعالیت پیش‌فرض ویژگی خاصی را برای URI داده ارائه می‌کند. به عنوان مثال، یک الگوی فیلتر هدف که URI داده "http://www.android.com" را مشخص می کند، از الگوی هدف اصلی مرورگر برای "http://" خاص تر است.

Android همچنین دارای مکانیزمی برای برنامه‌های شخص ثالث است تا رفتار پیوند دادن برنامه پیش‌فرض معتبر را برای انواع خاصی از اهداف URI وب اعلام کنند. وقتی چنین اعلان‌های معتبری در الگوهای فیلتر قصد برنامه تعریف می‌شوند، پیاده‌سازی دستگاه:

• [C-0-4] باید با انجام مراحل تأیید اعتبار تعریف شده در مشخصات پیوندهای دارایی دیجیتال، همانطور که توسط Package Manager در پروژه منبع باز Android بالادستی پیاده سازی شده است، تلاش کند تا فیلترهای هدف را تأیید کند.
• [C-0-5] باید در حین نصب برنامه، فیلترهای intent را تأیید کند و همه فیلترهای هدف UIR را که با موفقیت تأیید شده اند به عنوان کنترل کننده برنامه پیش فرض برای UIR هایشان تنظیم کند.
• ممکن است فیلترهای هدف URI خاص را به عنوان کنترل‌کننده برنامه پیش‌فرض برای URI‌هایشان تنظیم کند، در صورتی که با موفقیت تأیید شوند اما سایر فیلترهای URI کاندید تأیید نشوند. اگر پیاده‌سازی دستگاهی این کار را انجام دهد، باید در منوی تنظیمات، الگوی هر URI مناسب را به کاربر ارائه دهد.
• باید کنترل‌های پیوندهای برنامه هر برنامه را در تنظیمات به شرح زیر در اختیار کاربر قرار دهد:
  • [C-0-6] کاربر باید بتواند به طور کلی رفتار پیوندهای برنامه پیش‌فرض را لغو کند تا یک برنامه باشد: همیشه باز باشد، همیشه بپرسد یا هرگز باز نشود، که باید برای همه فیلترهای هدف URI نامزد به طور یکسان اعمال شود.
  • [C-0-7] کاربر باید بتواند فهرستی از فیلترهای هدف URI کاندید را ببیند.
  • پیاده‌سازی دستگاه ممکن است به کاربر این امکان را بدهد که فیلترهای هدف URI کاندید خاصی را که با موفقیت تأیید شده‌اند، بر اساس فیلتر هر قصد لغو کند.
  • [C-0-8] اگر پیاده‌سازی دستگاه اجازه می‌دهد برخی از فیلترهای هدف URI نامزد تأیید صحت داشته باشند در حالی که برخی دیگر ممکن است شکست بخورند، پیاده‌سازی دستگاه باید به کاربران امکان مشاهده و لغو فیلترهای هدف URI خاص را بدهد.

3.2.3.3. Intent Namespaces

• [C-0-1] پیاده‌سازی‌های دستگاه نباید شامل هیچ مؤلفه Android باشد که با استفاده از ACTION، CATEGORY یا سایر رشته‌های کلیدی در اندروید، هر هدف جدید یا الگوهای هدف پخش را رعایت کند. یا com.android. فضای نام
• [C-0-2] پیاده‌کننده‌های دستگاه نباید دارای اجزای Android باشند که با استفاده از ACTION، CATEGORY، یا رشته‌های کلیدی دیگر در فضای بسته متعلق به سازمانی دیگر، از هر هدف جدید یا الگوهای هدف پخش شده استفاده کنند.
• [C-0-3] پیاده‌کننده‌های دستگاه نباید هیچ یک از الگوهای هدف مورد استفاده توسط برنامه‌های اصلی فهرست‌شده در بخش 3.2.3.1 را تغییر دهند یا گسترش دهند.
• پیاده سازی دستگاه ممکن است شامل الگوهای هدف با استفاده از فضاهای نام به وضوح و آشکارا با سازمان خود باشد. این ممنوعیت مشابه آن چیزی است که برای کلاس های زبان جاوا در بخش 3.6 مشخص شده است.

3.2.3.4. اهداف پخش

برنامه های شخص ثالث برای پخش مقاصد خاصی به پلتفرم متکی هستند تا تغییرات در محیط سخت افزاری یا نرم افزاری را به آنها اطلاع دهند.

پیاده سازی دستگاه:

• [C-0-1] باید اهداف پخش عمومی را در پاسخ به رویدادهای سیستم مناسب همانطور که در مستندات SDK توضیح داده شده است، پخش کند. توجه داشته باشید که این الزام با بخش 3.5 مغایرت ندارد زیرا محدودیت برای برنامه های پس زمینه نیز در مستندات SDK توضیح داده شده است.

3.2.3.5. تنظیمات پیش فرض برنامه

Android شامل تنظیماتی است که به کاربران راهی آسان برای انتخاب برنامه های پیش فرض خود، به عنوان مثال برای صفحه اصلی یا پیامک، ارائه می دهد.

در جایی که منطقی است، پیاده‌سازی‌های دستگاه باید منوی تنظیمات مشابهی ارائه دهند و با الگوی فیلتر هدف و روش‌های API که در مستندات SDK به شرح زیر توضیح داده شده‌اند، سازگار باشند.

اگر پیاده‌سازی‌های دستگاه android.software.home_screen را گزارش کنند، آنها:

• [C-1-1] باید به قصد android.settings.HOME_SETTINGS برای نمایش منوی تنظیمات برنامه پیش‌فرض برای صفحه اصلی احترام بگذارد.

اگر پیاده‌سازی‌های دستگاه android.hardware.telephony را گزارش کنند، آنها:

• [C-2-1] باید یک منوی تنظیماتی ارائه دهد که android.provider.Telephony.ACTION_CHANGE_DEFAULT را برای نمایش یک گفتگو برای تغییر برنامه پیش‌فرض پیامک فراخوانی می‌کند.

• [C-2-2] باید به قصد android.telecom.action.CHANGE_DEFAULT_DIALER برای نشان دادن یک گفتگو برای اجازه دادن به کاربر برای تغییر برنامه پیش فرض تلفن احترام بگذارد.

• [C-2-3] باید به قصد android.telecom.action.CHANGE_PHONE_ACCOUNTS احترام بگذارد تا توانایی کاربر را برای پیکربندی ConnectionServices مرتبط با PhoneAccounts ، و همچنین یک PhoneAccount پیش‌فرض که ارائه‌دهنده خدمات مخابراتی برای برقراری تماس‌های خروجی از آن استفاده می‌کند، فراهم کند. اجرای AOSP با گنجاندن منوی «گزینه حساب‌های تماس» در منوی تنظیمات «تماس‌ها» این نیاز را برآورده می‌کند.

اگر پیاده سازی های دستگاه android.hardware.nfc.hce را گزارش کنند، آنها:

• [C-3-1] باید به قصد android.settings.NFC_PAYMENT_SETTINGS برای نمایش منوی تنظیمات پیش‌فرض برنامه برای Tap and Pay احترام بگذارد.

اگر پیاده‌سازی‌های دستگاه از VoiceInteractionService پشتیبانی می‌کنند و بیش از یک برنامه با استفاده از این API در یک زمان نصب شده‌اند، آنها:

• [C-4-1] باید به قصد android.settings.ACTION_VOICE_INPUT_SETTINGS برای نمایش منوی تنظیمات پیش‌فرض برنامه برای ورودی صوتی و کمک، احترام بگذارد.

3.2.4. فعالیت در نمایشگرهای ثانویه

اگر پیاده‌سازی‌های دستگاه اجازه راه‌اندازی فعالیت‌های عادی Android را در نمایشگرهای ثانویه می‌دهند، آنها:

• [C-1-1] باید پرچم ویژگی android.software.activities_on_secondary_displays را تنظیم کنید.
• [C-1-2] باید سازگاری API مشابه فعالیتی را که روی نمایشگر اصلی اجرا می شود تضمین کند.
• [C-1-3] باید اکتیویتی جدید را روی همان صفحه نمایشی که اکتیویتی که آن را راه‌اندازی کرده است، قرار دهد، زمانی که فعالیت جدید بدون تعیین نمایشگر هدف از طریق API ActivityOptions.setLaunchDisplayId() راه‌اندازی می‌شود.
• [C-1-4] وقتی نمایشگری با پرچم Display.FLAG_PRIVATE حذف می‌شود، باید همه فعالیت‌ها را نابود کند.
• [C-1-5] در صورتی که اندازه نمایشگر تغییر اندازه داده شود، باید همه فعالیت‌های موجود در VirtualDisplay را مطابق با آن تغییر اندازه دهد.
• ممکن است یک IME (ویرایشگر روش ورودی، یک کنترل کاربر که کاربران را قادر می‌سازد متن را وارد کنند) در صفحه نمایش اصلی، زمانی که یک فیلد ورودی متن روی یک نمایشگر ثانویه متمرکز می‌شود، نشان داده شود.
• هنگامی که ورودی های لمسی یا کلیدی پشتیبانی می شوند، باید فوکوس ورودی را مستقل از نمایشگر اصلی روی نمایشگر ثانویه اعمال کنید.
• باید دارای پیکربندی android.content.res.Configuration باشد که با آن نمایشگر مطابقت دارد تا اگر فعالیتی در صفحه نمایش ثانویه راه اندازی شود، نمایش داده شود، به درستی کار کند و سازگاری داشته باشد.

اگر پیاده‌سازی‌های دستگاه اجازه راه‌اندازی عادی فعالیت‌های Android را در نمایشگرهای ثانویه و نمایشگرهای اولیه و ثانویه می‌دهند، android.util.DisplayMetrics متفاوتی دارند:

• [C-2-1] فعالیت‌های غیرقابل تغییر اندازه (که دارای resizeableActivity=false در AndroidManifest.xml هستند) و برنامه‌هایی که سطح API 23 یا پایین‌تر را هدف قرار می‌دهند، نباید در نمایشگرهای ثانویه مجاز باشند.

اگر پیاده‌سازی‌های دستگاه اجازه راه‌اندازی فعالیت‌های عادی Android را در نمایشگرهای ثانویه می‌دهند و نمایشگر ثانویه دارای پرچم android.view.Display.FLAG_PRIVATE است:

• [C-3-1] فقط مالک آن نمایشگر، سیستم و فعالیت‌هایی که از قبل روی آن نمایشگر هستند، باید بتوانند به آن راه‌اندازی کنند. همه می توانند به نمایشگری راه اندازی کنند که دارای پرچم android.view.Display.FLAG_PUBLIC است.

3.3. سازگاری Native API

پیاده‌کننده‌های دستگاه عبارتند از:

سازگاری کد بومی چالش برانگیز است. به همین دلیل، پیاده‌کننده‌های دستگاه عبارتند از:

• [SR] اکیداً توصیه می‌شود از پیاده‌سازی‌های کتابخانه‌های فهرست‌شده در زیر از پروژه منبع باز Android بالادستی استفاده کنید.

3.3.1. رابط های باینری برنامه

بایت کد Dalvik مدیریت شده می تواند به کد بومی ارائه شده در فایل .apk برنامه به عنوان یک فایل ELF .so که برای معماری سخت افزاری مناسب دستگاه کامپایل شده است، فراخوانی کند. از آنجایی که کد بومی به شدت به فناوری پردازنده اصلی وابسته است، اندروید تعدادی رابط باینری برنامه (ABI) را در Android NDK تعریف می‌کند.

پیاده سازی دستگاه:

• [C-0-1] باید با یک یا چند ABI تعریف شده سازگار باشد و با Android NDK سازگاری داشته باشد.
• [C-0-2] باید شامل پشتیبانی از کدهای در حال اجرا در محیط مدیریت شده برای فراخوانی کد بومی، با استفاده از معناشناسی استاندارد Java Native Interface (JNI) باشد.
• [C-0-3] باید با منبع سازگار (یعنی سازگار با هدر) و سازگار با دودویی (برای ABI) با هر کتابخانه مورد نیاز در لیست زیر باشد.
• [C-0-4] در صورت پشتیبانی از ABI 64 بیتی، باید از ABI معادل 32 بیت پشتیبانی کند.
• [C-0-5] باید به طور دقیق رابط باینری برنامه (ABI) پشتیبانی شده توسط دستگاه را از طریق پارامترهای android.os.Build.SUPPORTED_ABIS ، android.os.Build.SUPPORTED_32_BIT_ABIS و android.os.Build.SUPPORTED_64_BIT_ABIS گزارش کند. ، هر کدام فهرستی از ABI با کاما جدا شده از بیشترین به کمترین ترجیح داده شده است.
• [C-0-6] باید از طریق پارامترهای بالا، فقط آن دسته از ABIهایی را گزارش کند که در آخرین نسخه مستندات مدیریت Android NDK ABI مستند و شرح داده شده است، و باید شامل پشتیبانی از برنامه افزودنی پیشرفته SIMD (معروف به NEON) باشد.

• [C-0-7] باید تمام کتابخانه‌های زیر را با ارائه APIهای بومی برای برنامه‌هایی که شامل کد بومی هستند در دسترس قرار دهد:

  • libaaudio.so (پشتیبانی صوتی بومی AAaudio)
  • libandroid.so (پشتیبانی از فعالیت های Android بومی)
  • libc (کتابخانه C)
  • libcamera2ndk.so
  • libdl (پیوند دهنده پویا)
  • libEGL.so (مدیریت سطح OpenGL بومی)
  • libGLESv1_CM.so (OpenGL ES 1.x)
  • libGLESv2.so (OpenGL ES 2.0)
  • libGLESv3.so (OpenGL ES 3.x)
  • libicui18n.so
  • libicuuc.so
  • libjnigraphics.so
  • liblog (لاگ اندروید)
  • libmediandk.so (پشتیبانی از APIهای رسانه بومی)
  • libm (کتابخانه ریاضی)
  • libOpenMAXAL.so (پشتیبانی از OpenMAX AL 1.0.1)
  • libOpenSLES.so (پشتیبانی صوتی OpenSL ES 1.0.1)
  • libRS.so
  • libstdc++ (حداقل پشتیبانی از C++)
  • libvulkan.so (ولکان)
  • libz (فشرده سازی Zlib)
  • رابط JNI

• [C-0-8] نباید توابع عمومی را برای کتابخانه های بومی فهرست شده در بالا اضافه یا حذف کرد.

• [C-0-9] باید کتابخانه‌های غیر AOSP اضافی که مستقیماً در معرض برنامه‌های شخص ثالث قرار گرفته‌اند را در /vendor/etc/public.libraries.txt کند.
• [C-0-10] نباید هیچ کتابخانه بومی دیگری را که در AOSP به عنوان کتابخانه‌های سیستمی پیاده‌سازی و ارائه شده‌اند، در معرض برنامه‌های شخص ثالثی قرار دهد که سطح API 24 یا بالاتر را هدف قرار می‌دهند.
• [C-0-11] باید تمام نمادهای تابع OpenGL ES 3.1 و بسته برنامه افزودنی Android ، همانطور که در NDK تعریف شده است، از طریق کتابخانه libGLESv3.so شود. توجه داشته باشید که در حالی که همه نمادها باید وجود داشته باشند، بخش 7.1.4.1 با جزئیات بیشتری شرایط مورد نیاز برای اجرای کامل هر یک از عملکردهای مربوطه را توضیح می دهد.
• [C-0-12] باید نمادهای تابع را برای نمادهای اصلی Vulkan 1.0 و همچنین VK_KHR_surface ، VK_KHR_android_surface ، VK_KHR_swapchain ، VK_KHR_maintenance1 ، و VK_KHR_get_physical_device_properties2 ، و VK_KHR_maintenance1، و libvulkan.so . توجه داشته باشید که در حالی که همه نمادها باید وجود داشته باشند، بخش 7.1.4.2 با جزئیات بیشتری شرایط مورد نیاز برای اجرای کامل هر یک از عملکردهای مربوطه را توضیح می دهد.
• باید با استفاده از کد منبع و فایل‌های سرصفحه موجود در پروژه منبع باز اندروید بالادست ساخته شود

Note that future releases of the Android NDK may introduce support for additional ABIs.

3.3.2. 32-bit ARM Native Code Compatibility

If device implementations are 64-bit ARM devices, then:

• [C-1-1] Although the ARMv8 architecture deprecates several CPU operations, including some operations used in existing native code, the following deprecated operations MUST remain available to 32-bit native ARM code, either through native CPU support or through software emulation:

  • SWP and SWPB instructions
  • SETEND instruction
  • CP15ISB, CP15DSB, and CP15DMB barrier operations

If device implementations include a 32-bit ARM ABI, they:

• [C-2-1] MUST include the following lines in /proc/cpuinfo when it is read by 32-bit ARM applications to ensure compatibility with applications built using legacy versions of Android NDK.

  • Features: , followed by a list of any optional ARMv7 CPU features supported by the device.
  • CPU architecture: , followed by an integer describing the device's highest supported ARM architecture (eg, "8" for ARMv8 devices).

• SHOULD not alter /proc/cpuinfo when read by 64-bit ARM or non-ARM applications.

3.4. Web Compatibility

3.4.1. WebView Compatibility

If device implementations provide a complete implementation of the android.webkit.Webview API, they:

• [C-1-1] MUST report android.software.webview .
• [C-1-2] MUST use the Chromium Project build from the upstream Android Open Source Project on the Android 8.1 branch for the implementation of the android.webkit.WebView API.

• [C-1-3] The user agent string reported by the WebView MUST be in this format:

  Mozilla/5.0 (Linux; Android $(VERSION); $(MODEL) Build/$(BUILD); wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 $(CHROMIUM_VER) Mobile Safari/537.36

  • The value of the $(VERSION) string MUST be the same as the value for android.os.Build.VERSION.RELEASE.
  • The value of the $(MODEL) string MUST be the same as the value for android.os.Build.MODEL.
  • The value of the $(BUILD) string MUST be the same as the value for android.os.Build.ID.
  • The value of the $(CHROMIUM_VER) string MUST be the version of Chromium in the upstream Android Open Source Project.
  • Device implementations MAY omit Mobile in the user agent string.

• The WebView component SHOULD include support for as many HTML5 features as possible and if it supports the feature SHOULD conform to the HTML5 specification .

3.4.2. Browser Compatibility

If device implementations include a standalone Browser application for general web browsing, they:

• [C-1-1] MUST support each of these APIs associated with HTML5:
  • application cache/offline operation
  • <video> tag
  • geolocation
• [C-1-2] MUST support the HTML5/W3C webstorage API and SHOULD support the HTML5/W3C IndexedDB API . Note that as the web development standards bodies are transitioning to favor IndexedDB over webstorage, IndexedDB is expected to become a required component in a future version of Android.
• MAY ship a custom user agent string in the standalone Browser application.
• SHOULD implement support for as much of HTML5 as possible on the standalone Browser application (whether based on the upstream WebKit Browser application or a third-party replacement).

However, If device implementations do not include a standalone Browser application, they:

• [C-2-1] MUST still support the public intent patterns as described in section 3.2.3.1 .

3.5. API Behavioral Compatibility

The behaviors of each of the API types (managed, soft, native, and web) must be consistent with the preferred implementation of the upstream Android Open Source Project . Some specific areas of compatibility are:

• [C-0-1] Devices MUST NOT change the behavior or semantics of a standard intent.
• [C-0-2] Devices MUST NOT alter the lifecycle or lifecycle semantics of a particular type of system component (such as Service, Activity, ContentProvider, etc.).
• [C-0-3] Devices MUST NOT change the semantics of a standard permission.
• Devices MUST NOT alter the limitations enforced on background applications. More specifically, for background apps:
  • [C-0-4] they MUST stop executing callbacks that are registered by the app to receive outputs from the GnssMeasurement and GnssNavigationMessage .
  • [C-0-5] they MUST rate-limit the frequency of updates that are provided to the app through the LocationManager API class or the WifiManager.startScan() method.
  • [C-0-6] if the app is targeting API level 25 or higher, they MUST NOT allow to register broadcast receivers for the implicit broadcasts of standard Android intents in the app's manifest, unless the broadcast intent requires a "signature" or "signatureOrSystem" protectionLevel permission or are on the exemption list .
  • [C-0-7] if the app is targeting API level 25 or higher, they MUST stop the app's background services, just as if the app had called the services' stopSelf() method, unless the app is placed on a temporary allowlist to handle a task that's visible to the user.
  • [C-0-8] if the app is targeting API level 25 or higher, they MUST release the wakelocks the app holds.

The above list is not comprehensive. The Compatibility Test Suite (CTS) tests significant portions of the platform for behavioral compatibility, but not all. It is the responsibility of the implementer to ensure behavioral compatibility with the Android Open Source Project. For this reason, device implementers SHOULD use the source code available via the Android Open Source Project where possible, rather than re-implement significant parts of the system.

3.6. API Namespaces

Android follows the package and class namespace conventions defined by the Java programming language. To ensure compatibility with third-party applications, device implementers MUST NOT make any prohibited modifications (see below) to these package namespaces:

• java.*
• javax.*
• sun.*
• android.*
• com.android.*

That is, they:

• [C-0-1] MUST NOT modify the publicly exposed APIs on the Android platform by changing any method or class signatures, or by removing classes or class fields.
• [C-0-2] MUST NOT add any publicly exposed elements (such as classes or interfaces, or fields or methods to existing classes or interfaces) or Test or System APIs to the APIs in the above namespaces. A “publicly exposed element” is any construct that is not decorated with the “@hide” marker as used in the upstream Android source code.

Device implementers MAY modify the underlying implementation of the APIs, but such modifications:

• [C-0-3] MUST NOT impact the stated behavior and Java-language signature of any publicly exposed APIs.
• [C-0-4] MUST NOT be advertised or otherwise exposed to developers.

However, device implementers MAY add custom APIs outside the standard Android namespace, but the custom APIs:

• [C-0-5] MUST NOT be in a namespace owned by or referring to another organization. For instance, device implementers MUST NOT add APIs to the com.google.* or similar namespace: only Google may do so. Similarly, Google MUST NOT add APIs to other companies' namespaces.
• [C-0-6] MUST be packaged in an Android shared library so that only apps that explicitly use them (via the <uses-library> mechanism) are affected by the increased memory usage of such APIs.

If a device implementer proposes to improve one of the package namespaces above (such as by adding useful new functionality to an existing API, or adding a new API), the implementer SHOULD visit source.android.com and begin the process for contributing changes and code, according to the information on that site.

Note that the restrictions above correspond to standard conventions for naming APIs in the Java programming language; this section simply aims to reinforce those conventions and make them binding through inclusion in this Compatibility Definition.

3.7. Runtime Compatibility

پیاده سازی دستگاه:

• [C-0-1] MUST support the full Dalvik Executable (DEX) format and Dalvik bytecode specification and semantics .

• [C-0-2] MUST configure Dalvik runtimes to allocate memory in accordance with the upstream Android platform, and as specified by the following table. (See section 7.1.1 for screen size and screen density definitions.)

• SHOULD use Android RunTime (ART), the reference upstream implementation of the Dalvik Executable Format, and the reference implementation's package management system.

• SHOULD run fuzz tests under various modes of execution and target architectures to assure the stability of the runtime. Refer to JFuzz and DexFuzz in the Android Open Source Project website.

Note that memory values specified below are considered minimum values and device implementations MAY allocate more memory per application.

3.8. User Interface Compatibility

3.8.1. Launcher (Home Screen)

Android includes a launcher application (home screen) and support for third-party applications to replace the device launcher (home screen).

If device implementations allow third-party applications to replace the device home screen, they:

• [C-1-1] MUST declare the platform feature android.software.home_screen .
• [C-1-2] MUST return the AdaptiveIconDrawable object when the third party application use <adaptive-icon> tag to provide their icon, and the PackageManager methods to retrieve icons are called.

If device implementations include a default launcher that supports in-app pinning of shortcuts, they:

• [C-2-1] MUST report true for ShortcutManager.isRequestPinShortcutSupported() .
• [C-2-2] MUST have user affordance asking the user before adding a shortcut requested by apps via the ShortcutManager.requestPinShortcut() API method.
• [C-2-3] MUST support pinned shortcuts and dynamic and static shortcuts as documented on the App Shortcuts page .

Conversely, if device implementations do not support in-app pinning of shortcuts, they:

• [C-3-1] MUST report false for ShortcutManager.isRequestPinShortcutSupported() .

If device implementations implement a default launcher that provides quick access to the additional shortcuts provided by third-party apps through the ShortcutManager API, they:

• [C-4-1] MUST support all documented shortcut features (eg static and dynamic shortcuts, pinning shortcuts) and fully implement the APIs of the ShortcutManager API class.

If device implementations include a default launcher app that shows badges for the app icons, they:

• [C-5-1] MUST respect the NotificationChannel.setShowBadge() API method. In other words, show a visual affordance associated with the app icon if the value is set as true , and do not show any app icon badging scheme when all of the app's notification channels have set the value as false .
• MAY override the app icon badges with their proprietary badging scheme when third-party applications indicate support of the proprietary badging scheme through the use of proprietary APIs, but SHOULD use the resources and values provided through the notification badges APIs described in the SDK , such as the Notification.Builder.setNumber() and the Notification.Builder.setBadgeIconType() API.

3.8.2. Widgets

Android supports third-party app widgets by defining a component type and corresponding API and lifecycle that allows applications to expose an “AppWidget” to the end user.

If device implementations support third-party app widgets, they:

• [C-1-1] MUST declare support for platform feature android.software.app_widgets .
• [C-1-2] MUST include built-in support for AppWidgets and expose user interface affordances to add, configure, view, and remove AppWidgets directly within the Launcher.
• [C-1-3] MUST be capable of rendering widgets that are 4 x 4 in the standard grid size. See the App Widget DesignGuidelines in the Android SDK documentation for details.
• MAY support application widgets on the lock screen.

If device implementations support third-party app widgets and in-app pinning of shortcuts, they:

• [C-2-1] MUST report true for AppWidgetManager.html.isRequestPinAppWidgetSupported() .
• [C-2-2] MUST have user affordance asking the user before adding a shortcut requested by apps via the AppWidgetManager.requestPinAppWidget() API method.

3.8.3. Notifications

Android includes Notification and NotificationManager APIs that allow third-party app developers to notify users of notable events and attract users' attention using the hardware components (eg sound, vibration and light) and software features (eg notification shade, system bar) of the device.

3.8.3.1. Presentation of Notifications

If device implementations allow third party apps to notify users of notable events , they:

• [C-1-1] MUST support notifications that use hardware features, as described in the SDK documentation, and to the extent possible with the device implementation hardware. For instance, if a device implementation includes a vibrator, it MUST correctly implement the vibration APIs. If a device implementation lacks hardware, the corresponding APIs MUST be implemented as no-ops. This behavior is further detailed in section 7 .
• [C-1-2] MUST correctly render all resources (icons, animation files etc.) provided for in the APIs, or in the Status/System Bar icon style guide , although they MAY provide an alternative user experience for notifications than that provided by the reference Android Open Source implementation.
• [C-1-3] MUST honor and implement properly the behaviors described for the APIs to update, remove and group notifications.
• [C-1-4] MUST provide the full behavior of the NotificationChannel API documented in the SDK.
• [C-1-5] MUST provide a user affordance to block and modify a certain third-party app's notification per each channel and app package level.
• [C-1-6] MUST also provide a user affordance to display deleted notification channels.
• SHOULD support rich notifications.
• SHOULD present some higher priority notifications as heads-up notifications.
• SHOULD have a user affordance to snooze notifications.
• MAY only manage the visibility and timing of when third-party apps can notify users of notable events to mitigate safety issues such as driver distraction.

If device implementations support rich notifications, they:

• [C-2-1] MUST use the exact resources as provided through the Notification.Style API class and its subclasses for the presented resource elements.
• SHOULD present each and every resource element (eg icon, title and summary text) defined in the Notification.Style API class and its subclasses.

If device implementations support heads-up notifications: they:

• [C-3-1] MUST use the heads-up notification view and resources as described in the Notification.Builder API class when heads-up notifications are presented.

3.8.3.2. Notification Listener Service

Android includes the NotificationListenerService APIs that allow apps (once explicitly enabled by the user) to receive a copy of all notifications as they are posted or updated.

If device implementations report the feature flag android.hardware.ram.normal , they:

• [C-1-1] MUST correctly and promptly update notifications in their entirety to all such installed and user-enabled listener services, including any and all metadata attached to the Notification object.
• [C-1-2] MUST respect the snoozeNotification() API call, and dismiss the notification and make a callback after the snooze duration that is set in the API call.

If device implementations have a user affordance to snooze notifications, they:

• [C-2-1] MUST reflect the snoozed notification status properly through the standard APIs such as NotificationListenerService.getSnoozedNotifications() .
• [C-2-2] MUST make this user affordance available to snooze notifications from each installed third-party app's, unless they are from persistent/foreground services.

3.8.3.3. DND (Do not Disturb)

If device implementations support the DND feature, they:

• [C-1-1] MUST implement an activity that would respond to the intent ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS , which for implementations with UI_MODE_TYPE_NORMAL it MUST be an activity where the user can grant or deny the app access to DND policy configurations.
• [C-1-2] MUST, for when the device implementation has provided a means for the user to grant or deny third-party apps to access the DND policy configuration, display Automatic DND rules created by applications alongside the user-created and pre-defined rules.
• [C-1-3] MUST honor the suppressedVisualEffects values passed along the NotificationManager.Policy and if an app has set any of the SUPPRESSED_EFFECT_SCREEN_OFF or SUPPRESSED_EFFECT_SCREEN_ON flags, it SHOULD indicate to the user that the visual effects are suppressed in the DND settings menu.

3.8.4. Search

Android includes APIs that allow developers to incorporate search into their applications and expose their application's data into the global system search. Generally speaking, this functionality consists of a single, system-wide user interface that allows users to enter queries, displays suggestions as users type, and displays results. The Android APIs allow developers to reuse this interface to provide search within their own apps and allow developers to supply results to the common global search user interface.

• Android device implementations SHOULD include global search, a single, shared, system-wide search user interface capable of real-time suggestions in response to user input.

If device implementations implement the global search interface, they:

• [C-1-1] MUST implement the APIs that allow third-party applications to add suggestions to the search box when it is run in global search mode.

If no third-party applications are installed that make use of the global search:

• The default behavior SHOULD be to display web search engine results and suggestions.

Android also includes the Assist APIs to allow applications to elect how much information of the current context is shared with the assistant on the device.

If device implementations support the Assist action, they:

• [C-2-1] MUST indicate clearly to the end user when the context is shared, by either:
  • Each time the assist app accesses the context, displaying a white light around the edges of the screen that meet or exceed the duration and brightness of the Android Open Source Project implementation.
  • For the preinstalled assist app, providing a user affordance less than two navigations away from the default voice input and assistant app settings menu , and only sharing the context when the assist app is explicitly invoked by the user through a hotword or assist navigation key input.
• [C-2-2] The designated interaction to launch the assist app as described in section 7.2.3 MUST launch the user-selected assist app, in other words the app that implements VoiceInteractionService , or an activity handling the ACTION_ASSIST intent.
• [SR] STRONGLY RECOMMENDED to use long press on HOME key as this designated interaction.

3.8.5. Alerts and Toasts

Applications can use the Toast API to display short non-modal strings to the end user that disappear after a brief period of time, and use the TYPE_APPLICATION_OVERLAY window type API to display alert windows as an overlay over other apps.

If device implementations include a screen or video output, they:

• [C-1-1] MUST provide a user affordance to block an app from displaying alert windows that use the TYPE_APPLICATION_OVERLAY . The AOSP implementation meets this requirement by having controls in the notification shade.

• [C-1-2] MUST honor the Toast API and display Toasts from applications to end users in some highly visible manner.

3.8.6. Themes

Android provides “themes” as a mechanism for applications to apply styles across an entire Activity or application.

Android includes a “Holo” and "Material" theme family as a set of defined styles for application developers to use if they want to match the Holo theme look and feel as defined by the Android SDK.

If device implementations include a screen or video output, they:

• [C-1-1] MUST NOT alter any of the Holo theme attributes exposed to applications.
• [C-1-2] MUST support the “Material” theme family and MUST NOT alter any of the Material theme attributes or their assets exposed to applications.

Android also includes a “Device Default” theme family as a set of defined styles for application developers to use if they want to match the look and feel of the device theme as defined by the device implementer.

• Device implementations MAY modify the Device Default theme attributes exposed to applications.

Android supports a variant theme with translucent system bars, which allows application developers to fill the area behind the status and navigation bar with their app content. To enable a consistent developer experience in this configuration, it is important the status bar icon style is maintained across different device implementations.

If device implementations include a system status bar, they:

• [C-2-1] MUST use white for system status icons (such as signal strength and battery level) and notifications issued by the system, unless the icon is indicating a problematic status or an app requests a light status bar using the SYSTEM_UI_FLAG_LIGHT_STATUS_BAR flag.
• [C-2-2] Android device implementations MUST change the color of the system status icons to black (for details, refer to R.style ) when an app requests a light status bar.

3.8.7. Live Wallpapers

Android defines a component type and corresponding API and lifecycle that allows applications to expose one or more “Live Wallpapers” to the end user. Live wallpapers are animations, patterns, or similar images with limited input capabilities that display as a wallpaper, behind other applications.

Hardware is considered capable of reliably running live wallpapers if it can run all live wallpapers, with no limitations on functionality, at a reasonable frame rate with no adverse effects on other applications. If limitations in the hardware cause wallpapers and/or applications to crash, malfunction, consume excessive CPU or battery power, or run at unacceptably low frame rates, the hardware is considered incapable of running live wallpaper. As an example, some live wallpapers may use an OpenGL 2.0 or 3.x context to render their content. Live wallpaper will not run reliably on hardware that does not support multiple OpenGL contexts because the live wallpaper use of an OpenGL context may conflict with other applications that also use an OpenGL context.

• Device implementations capable of running live wallpapers reliably as described above SHOULD implement live wallpapers.

If device implementations implement live wallpapers, they:

• [C-1-1] MUST report the platform feature flag android.software.live_wallpaper.

3.8.8. Activity Switching

The upstream Android source code includes the overview screen , a system-level user interface for task switching and displaying recently accessed activities and tasks using a thumbnail image of the application's graphical state at the moment the user last left the application.

Device implementations including the recents function navigation key as detailed in section 7.2.3 MAY alter the interface.

If device implementations including the recents function navigation key as detailed in section 7.2.3 alter the interface, they:

• [C-1-1] MUST support at least up to 7 displayed activities.
• SHOULD at least display the title of 4 activities at a time.
• [C-1-2] MUST implement the screen pinning behavior and provide the user with a settings menu to toggle the feature.
• SHOULD display highlight color, icon, screen title in recents.
• SHOULD display a closing affordance ("x") but MAY delay this until user interacts with screens.
• SHOULD implement a shortcut to switch easily to the previous activity
• SHOULD trigger the fast-switch action between the two most recently used apps, when the recents function key is tapped twice.
• SHOULD trigger the split-screen multiwindow-mode, if supported, when the recents functions key is long pressed.

• MAY display affiliated recents as a group that moves together.

• [SR] Are STRONGLY RECOMMENDED to use the upstream Android user interface (or a similar thumbnail-based interface) for the overview screen.

3.8.9. Input Management

Android includes support for Input Management and support for third-party input method editors.

If device implementations allow users to use third-party input methods on the device, they:

• [C-1-1] MUST declare the platform feature android.software.input_methods and support IME APIs as defined in the Android SDK documentation.
• [C-1-2] MUST provide a user-accessible mechanism to add and configure third-party input methods in response to the android.settings.INPUT_METHOD_SETTINGS intent.

If device implementations declare the android.software.autofill feature flag, they:

• [C-2-1] MUST fully implement the AutofillService and AutofillManager APIs and honor the android.settings.REQUEST_SET_AUTOFILL_SERVICE intent to show a default app settings menu to enable and disable autofill and change the default autofill service for the user.

3.8.10. Lock Screen Media Control

The Remote Control Client API is deprecated from Android 5.0 in favor of the Media Notification Template that allows media applications to integrate with playback controls that are displayed on the lock screen.

3.8.11. Screen savers (previously Dreams)

Android includes support for interactivescreensavers , previously referred to as Dreams. Screen savers allow users to interact with applications when a device connected to a power source is idle or docked in a desk dock. Android Watch devices MAY implement screen savers, but other types of device implementations SHOULD include support for screen savers and provide a settings option for users toconfigure screen savers in response to the android.settings.DREAM_SETTINGS intent.

3.8.12. Location

If device implementations include a hardware sensor (eg GPS) that is capable of providing the location coordinates:

• [C-1-1] location modes MUST be displayed in the Location menu within Settings.

3.8.13. Unicode and Font

Android includes support for the emoji characters defined in Unicode 10.0 .

If device implementations include a screen or video output, they:

• [C-1-1] MUST be capable of rendering these emoji characters in color glyph.
• [C-1-2] MUST include support for:
• Roboto 2 font with different weights—sans-serif-thin, sans-serif-light, sans-serif-medium, sans-serif-black, sans-serif-condensed, sans-serif-condensed-light for the languages available on the device.
• Full Unicode 7.0 coverage of Latin, Greek, and Cyrillic, including the Latin Extended A, B, C, and D ranges, and all glyphs in the currency symbols block of Unicode 7.0.
• SHOULD support the skin tone and diverse family emojis as specified in the Unicode Technical Report #51 .

If device implementations include an IME, they:

• SHOULD provide an input method to the user for these emoji characters.

3.8.14. Multi-windows

If device implementations have the capability to display multiple activities at the same time, they:

• [C-1-1] MUST implement such multi-window mode(s) in accordance with the application behaviors and APIs described in the Android SDK multi-window mode support documentation and meet the following requirements:
• [C-1-2] Applications can indicate whether they are capable of operating in multi-window mode in the AndroidManifest.xml file, either explicitly via setting the android:resizeableActivity attribute to true or implicitly by having the targetSdkVersion > 24. Apps that explicitly set this attribute to false in their manifest MUST NOT be launched in multi-window mode. Older apps with targetSdkVersion < 24 that did not set this android:resizeableActivity attribute MAY be launched in multi-window mode, but the system MUST provide warning that the app may not work as expected in multi-window mode.
• [C-1-3] MUST NOT offer split-screen or freeform mode if the screen height < 440 dp and the screen width < 440 dp.
• Device implementations with screen size xlarge SHOULD support freeform mode.

If device implementations support multi-window mode(s), and the split screen mode, they:

• [C-2-1] MUST preload a resizeable launcher as the default.
• [C-2-2] MUST crop the docked activity of a split-screen multi-window but SHOULD show some content of it, if the Launcher app is the focused window.
• [C-2-3] MUST honor the declared AndroidManifestLayout_minWidth and AndroidManifestLayout_minHeight values of the third-party launcher application and not override these values in the course of showing some content of the docked activity.

If device implementations support multi-window mode(s) and picture-in-picture multi-window mode, they:

• [C-3-1] MUST launch activities in picture-in-picture multi-window mode when the app is: * Targeting API level 26 or higher and declares android:supportsPictureInPicture * Targeting API level 25 or lower and declares both android:resizeableActivity and android:supportsPictureInPicture .
• [C-3-2] MUST expose the actions in their SystemUI as specified by the current PIP activity through the setActions() API.
• [C-3-3] MUST support aspect ratios greater than or equal to 1:2.39 and less than or equal to 2.39:1, as specified by the PIP activity through the setAspectRatio() API.
• [C-3-4] MUST use KeyEvent.KEYCODE_WINDOW to control the PIP window; if PIP mode is not implemented, the key MUST be available to the foreground activity.
• [C-3-5] MUST provide a user affordance to block an app from displaying in PIP mode; the AOSP implementation meets this requirement by having controls in the notification shade.
• [C-3-6] MUST allocate minimum width and height of 108 dp for the PIP window and minimum width of 240 dp and height of 135 dp for the PIP window when the Configuration.uiMode is configured as UI_MODE_TYPE_TELEVISION

3.9. Device Administration

Android includes features that allow security-aware applications to perform device administration functions at the system level, such as enforcing password policies or performing remote wipe, through the Android Device Administration API ].

If device implementations implement the full range of device administration policies defined in the Android SDK documentation, they:

• [C-1-1] MUST declare android.software.device_admin .
• [C-1-2] MUST support device owner provisioning as described in section 3.9.1 and section 3.9.1.1 .
• [C-1-3] MUST declare the support of manged profiles via the android.software.managed_users feature flag, except for when the device is configured so that it would report itself as a low RAM device or so that it allocate internal (non-removable) storage as shared storage.

3.9.1 Device Provisioning

3.9.1.1 Device owner provisioning

If device implementations declare android.software.device_admin , they:

• [C-1-1] MUST support enrolling a Device Policy Client (DPC) as a Device Owner app as described below:.
  • when the device implementation has no user data is configured yet, it:
    • [C-1-3] MUST report true for DevicePolicyManager.isProvisioningAllowed(ACTION_PROVISION_MANAGED_DEVICE) .
    • [C-1-4] MUST enroll the DPC application as the Device Owner app in response to the intent action android.app.action.PROVISION_MANAGED_DEVICE .
    • [C-1-5] MUST enroll the DPC application as the Device Owner app if the device declares Near-Field Communications (NFC) support via the feature flag android.hardware.nfc and receives an NFC message containing a record with MIME type MIME_TYPE_PROVISIONING_NFC .
  • When the device implementation has user data, it:
    • [C-1-6] MUST report false for the DevicePolicyManager.isProvisioningAllowed(ACTION_PROVISION_MANAGED_DEVICE) .
    • [C-1-7] MUST not enroll any DPC application as the Device Owner App any more.
• [C-1-2] MUST NOT set an application (including pre-installed app) as the Device Owner app without explicit consent or action from the user or the administrator of the device.

If device implementations declare android.software.device_admin , but also include a proprietary Device Owner management solution and provide a mechanism to promote an application configured in their solution as a "Device Owner equivalent" to the standard "Device Owner" as recognized by the standard Android DevicePolicyManager APIs, they:

• [C-2-1] MUST have a process in place to verify that the specific app being promoted belongs to a legitimate enterprise device management solution and it has been already configured in the proprietary solution to have the rights equivalent as a "Device Owner".
• [C-2-2] MUST show the same AOSP Device Owner consent disclosure as the flow initiated by android.app.action.PROVISION_MANAGED_DEVICE prior to enrolling the DPC application as "Device Owner".
• MAY have user data on the device prior to enrolling the DPC application as "Device Owner".

3.9.1.2 Managed profile provisioning

If device implementations declare android.software.managed_users , they:

• [C-1-1] MUST implement the APIs allowing a Device Policy Controller (DPC) application to become the owner of a new Managed Profile .

• [C-1-2] The managed profile provisioning process (the flow initiated by android.app.action.PROVISION_MANAGED_PROFILE ) users experience MUST align with the AOSP implementation.

• [C-1-3] MUST provide the following user affordances within the Settings to indicate to the user when a particular system function has been disabled by the Device Policy Controller (DPC):

  • A consistent icon or other user affordance (for example the upstream AOSP info icon) to represent when a particular setting is restricted by a Device Admin.
  • A short explanation message, as provided by the Device Admin via the setShortSupportMessage .
  • The DPC application's icon.

3.9.2 Managed Profile Support

If device implementations declare android.software.managed_users , they:

• [C-1-1] MUST support managed profiles via the android.app.admin.DevicePolicyManager APIs.
• [C-1-2] MUST allow one and only one managed profile to be created .
• [C-1-3] MUST use an icon badge (similar to the AOSP upstream work badge) to represent the managed applications and widgets and other badged UI elements like Recents & Notifications.
• [C-1-4] MUST display a notification icon (similar to the AOSP upstream work badge) to indicate when user is within a managed profile application.
• [C-1-5] MUST display a toast indicating that the user is in the managed profile if and when the device wakes up (ACTION_USER_PRESENT) and the foreground application is within the managed profile.
• [C-1-6] Where a managed profile exists, MUST show a visual affordance in the Intent 'Chooser' to allow the user to forward the intent from the managed profile to the primary user or vice versa, if enabled by the Device Policy Controller.
• [C-1-7] Where a managed profile exists, MUST expose the following user affordances for both the primary user and the managed profile:
  • Separate accounting for battery, location, mobile data and storage usage for the primary user and managed profile.
  • Independent management of VPN Applications installed within the primary user or managed profile.
  • Independent management of applications installed within the primary user or managed profile.
  • Independent management of accounts within the primary user or managed profile.
• [C-1-8] MUST ensure the preinstalled dialer, contacts and messaging applications can search for and look up caller information from the managed profile (if one exists) alongside those from the primary profile, if the Device Policy Controller permits it.
• [C-1-9] MUST ensure that it satisfies all the security requirements applicable for a device with multiple users enabled (see section 9.5 ), even though the managed profile is not counted as another user in addition to the primary user.
• [C-1-10] MUST support the ability to specify a separate lock screen meeting the following requirements to grant access to apps running in a managed profile.
  • Device implementations MUST honor the DevicePolicyManager.ACTION_SET_NEW_PASSWORD intent and show an interface to configure a separate lock screen credential for the managed profile.
  • The lock screen credentials of the managed profile MUST use the same credential storage and management mechanisms as the parent profile, as documented on the Android Open Source Project Site
  • The DPC password policies MUST apply to only the managed profile's lock screen credentials unless called upon the DevicePolicyManager instance returned by getParentProfileInstance .
• When contacts from the managed profile are displayed in the preinstalled call log, in-call UI, in-progress and missed-call notifications, contacts and messaging apps they SHOULD be badged with the same badge used to indicate managed profile applications.

3.10. Accessibility

Android provides an accessibility layer that helps users with disabilities to navigate their devices more easily. In addition, Android provides platform APIs that enable accessibility service implementations to receive callbacks for user and system events and generate alternate feedback mechanisms, such as text-to-speech, haptic feedback, and trackball/d-pad navigation.

If device implementations support third-party accessibility services, they:

• [C-1-1] MUST provide an implementation of the Android accessibility framework as described in the accessibility APIs SDK documentation.
• [C-1-2] MUST generate accessibility events and deliver the appropriate AccessibilityEvent to all registered AccessibilityService implementations as documented in the SDK.
• [C-1-3] MUST honor the android.settings.ACCESSIBILITY_SETTINGS intent to provide a user-accessible mechanism to enable and disable the third-party accessibility services alongside the preloaded accessibility services.
• [C-1-4] MUST add a button in the system's navigation bar allowing the user to control the accessibility service when the enabled accessibility services declare the AccessibilityServiceInfo.FLAG_REQUEST_ACCESSIBILITY_BUTTON . Note that for device implementations with no system navigation bar, this requirement is not applicable, but device implementations SHOULD provide a user affordance to control these accessibility services.

If device implementations include preloaded accessibility services, they:

• [C-2-1] MUST implement these preloaded accessibility services as Direct Boot aware apps when the data storage is encrypted with File Based Encryption (FBE).
• SHOULD provide a mechanism in the out-of-box setup flow for users to enable relevant accessibility services, as well as options to adjust the font size, display size and magnification gestures.

3.11. Text-to-Speech

Android includes APIs that allow applications to make use of text-to-speech (TTS) services and allows service providers to provide implementations of TTS services.

If device implementations reporting the feature android.hardware.audio.output, they:

• [C-1-1] MUST support the Android TTS framework APIs.

If device implementations support installation of third-party TTS engines, they:

• [C-2-1] MUST provide user affordance to allow the user to select a TTS engine for use at system level.

3.12. TV Input Framework

The Android Television Input Framework (TIF) simplifies the delivery of live content to Android Television devices. TIF provides a standard API to create input modules that control Android Television devices.

If device implementations support TIF, they:

• [C-1-1] MUST declare the platform feature android.software.live_tv .
• [C-1-2] MUST preload a TV application (TV App) and meet all requirements described in section 3.12.1 .

3.12.1. TV App

If device implementations support TIF:

• [C-1-1] The TV App MUST provide facilities to install and use TV Channels and meet the following requirements:

The TV app that is required for Android device implementations declaring the android.software.live_tv feature flag, MUST meet the following requirements:

• Device implementations SHOULD allow third-party TIF-based inputs ( third-party inputs ) to be installed and managed.
• Device implementations MAY provide visual separation between pre-installed TIF-based inputs (installed inputs) and third-party inputs.
• Device implementations SHOULD NOT display the third-party inputs more than a single navigation action away from the TV App (ie expanding a list of third-party inputs from the TV App).

The Android Open Source Project provides an implementation of the TV App that meets the above requirements.

3.12.1.1. Electronic Program Guide

If device implementations support TIF, they:

• [C-1-1] MUST show an informational and interactive overlay, which MUST include an electronic program guide (EPG) generated from the values in the TvContract.Programs fields.
• [C-1-2] On channel change, device implementations MUST display EPG data for the currently playing program.
• [SR] The EPG is STRONGLY RECOMMENDED to display installed inputs and third-party inputs with equal prominence. The EPG SHOULD NOT display the third-party inputs more than a single navigation action away from the installed inputs on the EPG.
• The EPG SHOULD display information from all installed inputs and third-party inputs.
• The EPG MAY provide visual separation between the installed inputs and third-party inputs.

3.12.1.2. Navigation

If device implementations support TIF, they:

• [C-1-1] MUST allow navigation for the following functions via the D-pad, Back, and Home keys on the Android Television device's input device(s) (ie remote control, remote control application, or game controller):

  • Changing TV channels
  • Opening EPG
  • Configuring and tuning to third-party TIF-based inputs (if those inputs are supported)
  • Opening Settings menu

• SHOULD pass key events to HDMI inputs through CEC.

3.12.1.3. TV input app linking

Android Television device implementations SHOULD support TV input app linking , which allows all inputs to provide activity links from the current activity to another activity (ie a link from live programming to related content). The TV App SHOULD show TV input app linking when it is provided.

3.12.1.4. Time shifting

If device implementations support TIF, they:

• [SR] STRONGLY RECOMMENDED to support time shifting, which allows the user to pause and resume live content.
• SHOULD provide the user a way to pause and resume the currently playing program, if time shifting for that program is available .

3.12.1.5. TV recording

If device implementations support TIF, they:

• [SR] STRONGLY RECOMMENDED to support TV recording.
• If the TV input supports recording and the recording of a program is not prohibited , the EPG MAY provide a way to record a program .

3.13. Quick Settings

Android provides a Quick Settings UI component that allows quick access to frequently used or urgently needed actions.

If device implementations include a Quick Settings UI component, they:

• [C-1-1] MUST allow the user to add or remove the tiles provided through the quicksettings APIs from a third-party app.
• [C-1-2] MUST NOT automatically add a tile from a third-party app directly to the Quick Settings.
• [C-1-3] MUST display all the user-added tiles from third-party apps alongside the system-provided quick setting tiles.

3.14. Media UI

If device implementations include the UI framework that supports third-party apps that depend on MediaBrowser and MediaSession , they:

• [C-1-1] MUST display MediaItem icons and notification icons unaltered.
• [C-1-2] MUST display those items as described by MediaSession, eg, metadata, icons, imagery.
• [C-1-3] MUST show app title.
• [C-1-4] MUST have drawer to present MediaBrowser hierarchy.
• [C-1-5] MUST consider double tap of KEYCODE_HEADSETHOOK or KEYCODE_MEDIA_PLAY_PAUSE as KEYCODE_MEDIA_NEXT for MediaSession.Callback#onMediaButtonEvent .

3.15. Instant Apps

Device implementations MUST satisfy the following requirements:

• [C-0-1] Instant Apps MUST only be granted permissions that have the android:protectionLevel set to "ephemeral" .
• [C-0-2] Instant Apps MUST NOT interact with installed apps via implicit intents unless one of the following is true:
  • The component's intent pattern filter is exposed and has CATEGORY_BROWSABLE
  • The action is one of ACTION_SEND, ACTION_SENDTO, ACTION_SEND_MULTIPLE
  • The target is explicitly exposed with android:visibleToInstantApps
• [C-0-3] Instant Apps MUST NOT interact explicitly with installed apps unless the component is exposed via android:visibleToInstantApps.
• [C-0-4] IInstalled Apps MUST NOT see details about Instant Apps on the device unless the Instant App explicitly connects to the installed application.

3.16. Companion Device Pairing

Android includes support for companion device pairing to more effectively manage association with companion devices and provides the CompanionDeviceManager API for apps to access this feature.

If device implementations support the companion device pairing feature, they:

• [C-1-1] MUST declare the feature flag FEATURE_COMPANION_DEVICE_SETUP .
• [C-1-2] MUST ensure the APIs in the android.companion package is fully implemented.
• [C-1-3] MUST provide user affordances for the user to select/confirm a companion device is present and operational.

4. Application Packaging Compatibility

Devices implementations:

• [C-0-1] MUST be capable of installing and running Android “.apk” files as generated by the “aapt” tool included in the official Android SDK .
• As the above requirement may be challenging, device implementations are RECOMMENDED to use the AOSP reference implementation's package management systemDevice implementations.
• [C-0-2] MUST support verifying “.apk” files using the APK Signature Scheme v2 and JAR signing .
• [C-0-3] MUST NOT extend either the .apk , Android Manifest , Dalvik bytecode , or RenderScript bytecode formats in such a way that would prevent those files from installing and running correctly on other compatible devices.
• [C-0-4] MUST NOT allow apps other than the current "installer of record" for the package to silently uninstall the app without any prompt, as documented in the SDK for the DELETE_PACKAGE permission. The only exceptions are the system package verifier app handling PACKAGE_NEEDS_VERIFICATION intent and the storage manager app handling ACTION_MANAGE_STORAGE intent.

Device implementations MUST NOT install application packages from unknown sources, unless the app that requests the installation meets all the following requirements:

• It MUST declare the REQUEST_INSTALL_PACKAGES permission or have the android:targetSdkVersion set at 24 or lower.
• It MUST have been granted permission by the user to install apps from unknown sources.

Device implementations MUST have an activity that handles the android.settings.MANAGE_UNKNOWN_APP_SOURCES intent. They SHOULD provide a user affordance to grant/revoke the permission to install apps from unknown sources per application, but MAY choose to implement this as a no-op and return RESULT_CANCELED for startActivityForResult() , if the device implementation does not want to allow users to have this choice. However even in such cases, they SHOULD indicate to the user why there is no such choice presented.

5. Multimedia Compatibility

پیاده سازی دستگاه:

• [C-0-1] MUST support the media formats, encoders, decoders, file types, and container formats defined in section 5.1 for each and every codec declared by MediaCodecList .
• [C-0-2] MUST declare and report support of the encoders, decoders available to third-party applications via MediaCodecList .
• [C-0-3] MUST be able to decode and make available to third-party apps all the formats it can encode. This includes all bitstreams that its encoders generate and the profiles reported in its CamcorderProfile .

پیاده سازی دستگاه:

• SHOULD aim for minimum codec latency, in others words, they
  • SHOULD NOT consume and store input buffers and return input buffers only once processed.
  • SHOULD NOT hold onto decoded buffers for longer than as specified by the standard (eg SPS).
  • SHOULD NOT hold onto encoded buffers longer than required by the GOP structure.

All of the codecs listed in the section below are provided as software implementations in the preferred Android implementation from the Android Open Source Project.

Please note that neither Google nor the Open Handset Alliance make any representation that these codecs are free from third-party patents. Those intending to use this source code in hardware or software products are advised that implementations of this code, including in open source software or shareware, may require patent licenses from the relevant patent holders.

5.1. Media Codecs

5.1.1. Audio Encoding

See more details in 5.1.3. Audio Codecs Details .

If device implementations declare android.hardware.microphone , they MUST support the following audio encoding:

• [C-1-1] PCM/WAVE

5.1.2. Audio Decoding

See more details in 5.1.3. Audio Codecs Details .

If device implementations declare support for the android.hardware.audio.output feature, they:

• [C-1-1] MPEG-4 AAC Profile (AAC LC)
• [C-1-2] MPEG-4 HE AAC Profile (AAC+)
• [C-1-3] MPEG-4 HE AACv2 Profile (enhanced AAC+)
• [C-1-4] AAC ELD (enhanced low delay AAC)
• [C-1-5] FLAC
• [C-1-6] MP3
• [C-1-7] MIDI
• [C-1-8] Vorbis
• [C-1-9] PCM/WAVE
• [C-1-10] Opus

If device implementations support the decoding of AAC input buffers of multichannel streams (ie more than two channels) to PCM through the default AAC audio decoder in the android.media.MediaCodec API, the following MUST be supported:

• [C-2-1] Decoding MUST be performed without downmixing (eg a 5.0 AAC stream must be decoded to five channels of PCM, a 5.1 AAC stream must be decoded to six channels of PCM).
• [C-2-2] Dynamic range metadata MUST be as defined in "Dynamic Range Control (DRC)" in ISO/IEC 14496-3, and the android.media.MediaFormat DRC keys to configure the dynamic range-related behaviors of the audio decoder. The AAC DRC keys were introduced in API 21,and are: KEY_AAC_DRC_ATTENUATION_FACTOR, KEY_AAC_DRC_BOOST_FACTOR, KEY_AAC_DRC_HEAVY_COMPRESSION, KEY_AAC_DRC_TARGET_REFERENCE_LEVEL and KEY_AAC_ENCODED_TARGET_LEVEL

5.1.3. Audio Codecs Details

5.1.4. Image Encoding

See more details in 5.1.6. Image Codecs Details .

Device implementations MUST support encoding the following image encoding:

• [C-0-1] JPEG
• [C-0-2] PNG
• [C-0-3] WebP

5.1.5. Image Decoding

See more details in 5.1.6. Image Codecs Details .

Device implementations MUST support encoding the following image decoding:

• [C-0-1] JPEG
• [C-0-2] GIF
• [C-0-3] PNG
• [C-0-4] BMP
• [C-0-5] WebP
• [C-0-6] Raw

5.1.6. Image Codecs Details

5.1.7. Video Codecs

• For acceptable quality of web video streaming and video-conference services, device implementations SHOULD use a hardware VP8 codec that meets the requirements .

If device implementations include a video decoder or encoder:

• [C-1-1] Video codecs MUST support output and input bytebuffer sizes that accommodate the largest feasible compressed and uncompressed frame as dictated by the standard and configuration but also not overallocate.

• [C-1-2] Video encoders and decoders MUST support YUV420 flexible color format (COLOR_FormatYUV420Flexible).

If device implementations advertise HDR profile support through Display.HdrCapabilities , they:

• [C-2-1] MUST support HDR static metadata parsing and handling.

If device implementations advertise intra refresh support through FEATURE_IntraRefresh in the MediaCodecInfo.CodecCapabilities class, they:

• [C-3-1]MUST support the refresh periods in the range of 10 - 60 frames and accurately operate within 20% of configured refresh period.

5.1.8. Video Codecs List

5.2. Video Encoding

If device implementations support any video encoder and make it available to third-party apps, they:

• SHOULD NOT be, over two sliding windows, more than ~15% over the bitrate between intraframe (I-frame) intervals.
• SHOULD NOT be more than ~100% over the bitrate over a sliding window of 1 second.

If device implementations include an embedded screen display with the diagonal length of at least 2.5 inches or include a video output port or declare the support of a camera via the android.hardware.camera.any feature flag, they:

• [C-1-1] MUST include the support of at least one of the VP8 or H.264 video encoders, and make it available for third-party applications.
• SHOULD support both VP8 and H.264 video encoders, and make it available for third-party applications.

If device implementations support any of the H.264, VP8, VP9 or HEVC video encoders and make it available to third-party applications, they:

• [C-2-1] MUST support dynamically configurable bitrates.
• SHOULD support variable frame rates, where video encoder SHOULD determine instantaneous frame duration based on the timestamps of input buffers, and allocate its bit bucket based on that frame duration.

If device implementations support the MPEG-4 SP video encoder and make it available to third-party apps, they:

• SHOULD support dynamically configurable bitrates for the supported encoder.

5.2.1. H.263

If device implementations support H.263 encoders and make it available to third-party apps, they:

• [C-1-1] MUST support Baseline Profile Level 45.
• SHOULD support dynamically configurable bitrates for the supported encoder.

5.2.2. H-264

If device implementations support H.264 codec, they:

• [C-1-1] MUST support Baseline Profile Level 3. However, support for ASO (Arbitrary Slice Ordering), FMO (Flexible Macroblock Ordering) and RS (Redundant Slices) is OPTIONAL. Moreover, to maintain compatibility with other Android devices, it is RECOMMENDED that ASO, FMO and RS are not used for Baseline Profile by encoders.
• [C-1-2] MUST support the SD (Standard Definition) video encoding profiles in the following table.
• SHOULD support Main Profile Level 4.
• SHOULD support the HD (High Definition) video encoding profiles as indicated in the following table.

If device implementations report support of H.264 encoding for 720p or 1080p resolution videos through the media APIs, they:

• [C-2-1] MUST support the encoding profiles in the following table.

5.2.3. VP8

If device implementations support VP8 codec, they:

• [C-1-1] MUST support the SD video encoding profiles.
• SHOULD support the following HD (High Definition) video encoding profiles.
• SHOULD support writing Matroska WebM files.
• SHOULD use a hardware VP8 codec that meets the WebM project RTC hardware coding requirements , to ensure acceptable quality of web video streaming and video-conference services.

If device implementations report support of VP8 encoding for 720p or 1080p resolution videos through the media APIs, they:

• [C-2-1] MUST support the encoding profiles in the following table.

5.2.4. VP9

If device implementations support VP9 codec, they:

• SHOULD support writing Matroska WebM files.

5.3. Video Decoding

If device implementations support VP8, VP9, H.264, or H.265 codecs, they:

• [C-1-1] MUST support dynamic video resolution and frame rate switching through the standard Android APIs within the same stream for all VP8, VP9, H.264, and H.265 codecs in real time and up to the maximum resolution supported by each codec on the device.

If device implementations declare support for the Dolby Vision decoder through HDR_TYPE_DOLBY_VISION , they:

• [C-2-1] MUST provide a Dolby Vision-capable extractor.
• [C-2-2] MUST properly display Dolby Vision content on the device screen or on a standard video output port (eg, HDMI).
• [C-2-3] MUST set the track index of backward-compatible base-layer(s) (if present) to be the same as the combined Dolby Vision layer's track index.

5.3.1. MPEG-2

If device implementations support MPEG-2 decoders, they:

• [C-1-1] MUST support the Main Profile High Level.

5.3.2. H.263

If device implementations support H.263 decoders, they:

• [C-1-1] MUST support Baseline Profile Level 30 and Level 45.

5.3.3. MPEG-4

If device implementations with MPEG-4 decoders, they:

• [C-1-1] MUST support Simple Profile Level 3.

5.3.4. H.264

If device implementations support H.264 decoders, they:

• [C-1-1] MUST support Main Profile Level 3.1 and Baseline Profile. Support for ASO (Arbitrary Slice Ordering), FMO (Flexible Macroblock Ordering) and RS (Redundant Slices) is OPTIONAL.
• [C-1-2] MUST be capable of decoding videos with the SD (Standard Definition) profiles listed in the following table and encoded with the Baseline Profile and Main Profile Level 3.1 (including 720p30).
• SHOULD be capable of decoding videos with the HD (High Definition) profiles as indicated in the following table.

If the height that is reported by the Display.getSupportedModes() method is equal or greater than the video resolution, device implementations:

• [C-2-1] MUST support the HD 720p video encoding profiles in the following table.
• [C-2-2] MUST support the HD 1080p video encoding profiles in the following table.

5.3.5. H.265 (HEVC)

If device implementations support H.265 codec, they:

• [C-1-1] MUST support the Main Profile Level 3 Main tier and the SD video decoding profiles as indicated in the following table.
• SHOULD support the HD decoding profiles as indicated in the following table.
• [C-1-2] MUST support the HD decoding profiles as indicated in the following table if there is a hardware decoder.

If the height that is reported by the Display.getSupportedModes() method is equal to or greater than the video resolution, then:

• [C-2-1] Device implementations MUST support at least one of H.265 or VP9 decoding of 720, 1080 and UHD profiles.

5.3.6. VP8

If device implementations support VP8 codec, they:

• [C-1-1] MUST support the SD decoding profiles in the following table.
• SHOULD use a hardware VP8 codec that meets the requirements .
• SHOULD support the HD decoding profiles in the following table.

If the height as reported by the Display.getSupportedModes() method is equal or greater than the video resolution, then:

• [C-2-1] Device implementations MUST support 720p profiles in the following table.
• [C-2-2] Device implementations MUST support 1080p profiles in the following table.

5.3.7. VP9

If device implementations support VP9 codec, they:

• [C-1-1] MUST support the SD video decoding profiles as indicated in the following table.
• SHOULD support the HD decoding profiles as indicated in the following table.

If device implementations support VP9 codec and a hardware decoder:

• [C-2-2] MUST support the HD decoding profiles as indicated in the following table.

If the height that is reported by the Display.getSupportedModes() method is equal to or greater than the video resolution, then:

• [C-3-1] Device implementations MUST support at least one of VP9 or H.265 decoding of the 720, 1080 and UHD profiles.

5.4. Audio Recording

While some of the requirements outlined in this section are listed as SHOULD since Android 4.3, the Compatibility Definition for future versions are planned to change these to MUST. Existing and new Android devices are STRONGLY RECOMMENDED to meet these requirements that are listed as SHOULD, or they will not be able to attain Android compatibility when upgraded to the future version.

5.4.1. Raw Audio Capture

If device implementations declare android.hardware.microphone , they:

• [C-1-1] MUST allow capture of raw audio content with the following characteristics:

• Format : Linear PCM, 16-bit

• Sampling rates : 8000, 11025, 16000, 44100 Hz

• Channels : Mono

• [C-1-2] MUST capture at above sample rates without up-sampling.

• [C-1-3] MUST include an appropriate anti-aliasing filter when the sample rates given above are captured with down-sampling.

• SHOULD allow AM radio and DVD quality capture of raw audio content, which means the following characteristics:

• Format : Linear PCM, 16-bit

• Sampling rates : 22050, 48000 Hz
• Channels : Stereo

If device implementations allow AM radio and DVD quality capture of raw audio content, they:

• [C-2-1] MUST capture without up-sampling at any ratio higher than 16000:22050 or 44100:48000.
• [C-2-2] MUST include an appropriate anti-aliasing filter for any up-sampling or down-sampling.

5.4.2. Capture for Voice Recognition

If device implementations declare android.hardware.microphone , they:

• [C-1-1] MUST capture android.media.MediaRecorder.AudioSource.VOICE_RECOGNITION audio source at one of the sampling rates, 44100 and 48000.
• [C-1-2] MUST, by default, disable any noise reduction audio processing when recording an audio stream from the AudioSource.VOICE_RECOGNITION audio source.
• [C-1-3] MUST, by default, disable any automatic gain control when recording an audio stream from the AudioSource.VOICE_RECOGNITION audio source.
• SHOULD record the voice recognition audio stream with approximately flat amplitude versus frequency characteristics: specifically, ±3 dB, from 100 Hz to 4000 Hz.
• SHOULD record the voice recognition audio stream with input sensitivity set such that a 90 dB sound power level (SPL) source at 1000 Hz yields RMS of 2500 for 16-bit samples.
• SHOULD record the voice recognition audio stream so that the PCM amplitude levels linearly track input SPL changes over at least a 30 dB range from -18 dB to +12 dB re 90 dB SPL at the microphone.
• SHOULD record the voice recognition audio stream with total harmonic distortion (THD) less than 1% for 1 kHz at 90 dB SPL input level at the microphone.

If device implementations declare android.hardware.microphone and noise suppression (reduction) technologies tuned for speech recognition, they:

• [C-2-1] MUST allow this audio affect to be controllable with the android.media.audiofx.NoiseSuppressor API.
• [C-2-2] MUST uniquely identfiy each noise suppression technology implementation via the AudioEffect.Descriptor.uuid field.

5.4.3. Capture for Rerouting of Playback

The android.media.MediaRecorder.AudioSource class includes the REMOTE_SUBMIX audio source.

If device implementations declare both android.hardware.audio.output and android.hardware.microphone , they:

• [C-1-1] MUST properly implement the REMOTE_SUBMIX audio source so that when an application uses the android.media.AudioRecord API to record from this audio source, it captures a mix of all audio streams except for the following:

  • AudioManager.STREAM_RING
  • AudioManager.STREAM_ALARM
  • AudioManager.STREAM_NOTIFICATION

5.5. Audio Playback

Android includes the support to allow apps to playback audio through the audio output peripheral as defined in section 7.8.2.

5.5.1. Raw Audio Playback

If device implementations declare android.hardware.audio.output , they:

• [C-1-1] MUST allow playback of raw audio content with the following characteristics:

  • Format : Linear PCM, 16-bit
  • Sampling rates : 8000, 11025, 16000, 22050, 32000, 44100
  • Channels : Mono, Stereo

• SHOULD allow playback of raw audio content with the following characteristics:

  • Sampling rates : 24000, 48000

5.5.2. Audio Effects

Android provides an API for audio effects for device implementations.

If device implementations declare the feature android.hardware.audio.output , they:

• [C-1-1] MUST support the EFFECT_TYPE_EQUALIZER and EFFECT_TYPE_LOUDNESS_ENHANCER implementations controllable through the AudioEffect subclasses Equalizer , LoudnessEnhancer .
• [C-1-2] MUST support the visualizer API implementation, controllable through the Visualizer class.
• SHOULD support the EFFECT_TYPE_BASS_BOOST , EFFECT_TYPE_ENV_REVERB , EFFECT_TYPE_PRESET_REVERB , and EFFECT_TYPE_VIRTUALIZER implementations controllable through the AudioEffect sub-classes BassBoost , EnvironmentalReverb , PresetReverb , and Virtualizer .

5.5.3. Audio Output Volume

پیاده سازی دستگاه خودرو:

• SHOULD allow adjusting audio volume separately per each audio stream using the content type or usage as defined by AudioAttributes and car audio usage as publicly defined in android.car.CarAudioManager .

5.6. Audio Latency

Audio latency is the time delay as an audio signal passes through a system. Many classes of applications rely on short latencies, to achieve real-time sound effects.

For the purposes of this section, use the following definitions:

• output latency . The interval between when an application writes a frame of PCM-coded data and when the corresponding sound is presented to environment at an on-device transducer or signal leaves the device via a port and can be observed externally.
• cold output latency . The output latency for the first frame, when the audio output system has been idle and powered down prior to the request.
• continuous output latency . The output latency for subsequent frames, after the device is playing audio.
• input latency . The interval between when a sound is presented by environment to device at an on-device transducer or signal enters the device via a port and when an application reads the corresponding frame of PCM-coded data.
• lost input . The initial portion of an input signal that is unusable or unavailable.
• cold input latency . The sum of lost input time and the input latency for the first frame, when the audio input system has been idle and powered down prior to the request.
• continuous input latency . The input latency for subsequent frames, while the device is capturing audio.
• cold output jitter . The variability among separate measurements of cold output latency values.
• cold input jitter . The variability among separate measurements of cold input latency values.
• continuous round-trip latency . The sum of continuous input latency plus continuous output latency plus one buffer period. The buffer period allows time for the app to process the signal and time for the app to mitigate phase difference between input and output streams.
• OpenSL ES PCM buffer queue API . The set of PCM-related OpenSL ES APIs within Android NDK .
• AAudio native audio API . The set of AAudio APIs within Android NDK .

If device implementations declare android.hardware.audio.output they are STRONGLY RECOMMENDED to meet or exceed the following requirements:

• [SR] Cold output latency of 100 milliseconds or less
• [SR] Continuous output latency of 45 milliseconds or less
• [SR] Minimize the cold output jitter

If device implementations meet the above requirements after any initial calibration when using the OpenSL ES PCM buffer queue API, for continuous output latency and cold output latency over at least one supported audio output device, they are:

• [SR] STRONGLY RECOMMENDED to report low latency audio by declaring android.hardware.audio.low_latency feature flag.
• [SR] STRONGLY RECOMMENDED to also meet the requirements for low-latency audio via the AAudio API.

If device implementations do not meet the requirements for low-latency audio via the OpenSL ES PCM buffer queue API, they:

• [C-1-1] MUST NOT report support for low-latency audio.

If device implementations include android.hardware.microphone , they are STRONGLY RECOMMENDED to meet these input audio requirements:

• [SR] Cold input latency of 100 milliseconds or less
• [SR] Continuous input latency of 30 milliseconds or less
• [SR] Continuous round-trip latency of 50 milliseconds or less
• [SR] Minimize the cold input jitter

5.7. Network Protocols

Device implementations MUST support the media network protocols for audio and video playback as specified in the Android SDK documentation.

If device implementations include an audio or a video decoder, they:

• [C-1-1] MUST support all required codecs and container formats in section 5.1 over HTTP(S).

• [C-1-2] MUST support the media segment formats shown in the Media Segmant Formats table below over HTTP Live Streaming draft protocol, Version 7 .

• [C-1-3] MUST support the following RTP audio video profile and related codecs in the RTSP table below. For exceptions please see the table footnotes in section 5.1 .

Media Segment Formats

RTSP (RTP, SDP)

5.8. Secure Media

If device implementations support secure video output and are capable of supporting secure surfaces, they:

• [C-1-1] MUST declare support for Display.FLAG_SECURE .

If device implementations declare support for Display.FLAG_SECURE and support wireless display protocol, they:

• [C-2-1] MUST secure the link with a cryptographically strong mechanism such as HDCP 2.x or higher for the displays connected through wireless protocols such as Miracast.

If device implementations declare support for Display.FLAG_SECURE and support wired external display, they:

• [C-3-1] MUST support HDCP 1.2 or higher for all wired external displays.

5.9. Musical Instrument Digital Interface (MIDI)

If device implementations report support for feature android.software.midi via the android.content.pm.PackageManager class, they:

• [C-1-1] MUST support MIDI over all MIDI-capable hardware transports for which they provide generic non-MIDI connectivity, where such transports are:

  • USB host mode, section 7.7
  • USB peripheral mode, section 7.7
  • MIDI over Bluetooth LE acting in central role, section 7.4.3

• [C-1-2] MUST support the inter-app MIDI software transport (virtual MIDI devices)

5.10. Professional Audio

If device implementations report support for feature android.hardware.audio.pro via the android.content.pm.PackageManager class, they:

• [C-1-1] MUST report support for feature android.hardware.audio.low_latency .
• [C-1-2] MUST have the continuous round-trip audio latency, as defined in section 5.6 Audio Latency , MUST be 20 milliseconds or less and SHOULD be 10 milliseconds or less over at least one supported path.
• [C-1-3] MUST include a USB port(s) supporting USB host mode and USB peripheral mode.
• [C-1-4] MUST report support for feature android.software.midi .
• [C-1-5] MUST meet latencies and USB audio requirements using the OpenSL ES PCM buffer queue API.
• [SR] Are STRONGLY RECOMMENDED to provide a consistent level of CPU performance while audio is active and CPU load is varying. This should be tested using SimpleSynth commit 1bd6391 . The SimpleSynth app needs to be run with below parameters and achieve zero underruns after 10 minutes:
  • Work cycles: 200,000
  • Variable load: ON (this will switch between 100% and 10% of the work cycles value every 2 seconds and is designed to test CPU governor behavior)
  • Stabilized load: OFF
• SHOULD minimize audio clock inaccuracy and drift relative to standard time.
• SHOULD minimize audio clock drift relative to the CPU CLOCK_MONOTONIC when both are active.
• SHOULD minimize audio latency over on-device transducers.
• SHOULD minimize audio latency over USB digital audio.
• SHOULD document audio latency measurements over all paths.
• SHOULD minimize jitter in audio buffer completion callback entry times, as this affects usable percentage of full CPU bandwidth by the callback.
• SHOULD provide zero audio underruns (output) or overruns (input) under normal use at reported latency.
• SHOULD provide zero inter-channel latency difference.
• SHOULD minimize MIDI mean latency over all transports.
• SHOULD minimize MIDI latency variability under load (jitter) over all transports.
• SHOULD provide accurate MIDI timestamps over all transports.
• SHOULD minimize audio signal noise over on-device transducers, including the period immediately after cold start.
• SHOULD provide zero audio clock difference between the input and output sides of corresponding end-points, when both are active. Examples of corresponding end-points include the on-device microphone and speaker, or the audio jack input and output.
• SHOULD handle audio buffer completion callbacks for the input and output sides of corresponding end-points on the same thread when both are active, and enter the output callback immediately after the return from the input callback. Or if it is not feasible to handle the callbacks on the same thread, then enter the output callback shortly after entering the input callback to permit the application to have a consistent timing of the input and output sides.
• SHOULD minimize the phase difference between HAL audio buffering for the input and output sides of corresponding end-points.
• SHOULD minimize touch latency.
• SHOULD minimize touch latency variability under load (jitter).

If device implementations meet all of the above requirements, they:

• [SR] STRONGLY RECOMMENDED to report support for feature android.hardware.audio.pro via the android.content.pm.PackageManager class.

If device implementations meet the requirements via the OpenSL ES PCM buffer queue API, they:

• [SR] STRONGLY RECOMMENDED to also meet the same requirements via the AAudio API.

If device implementations include a 4 conductor 3.5mm audio jack, they:

• [C-2-1] MUST have the continuous round-trip audio latency to be 20 milliseconds or less over the audio jack path.
• [SR] STRONGLY RECOMMENDED to comply with section Mobile device (jack) specifications of the Wired Audio Headset Specification (v1.1) .
• The continuous round-trip audio latency SHOULD be 10 milliseconds or less over the audio jack path.

If device implementations omit a 4 conductor 3.5mm audio jack and include a USB port(s) supporting USB host mode, they:

• [C-3-1] MUST implement the USB audio class.
• [C-3-2] MUST have a continuous round-trip audio latency of 20 milliseconds or less over the USB host mode port using USB audio class.
• The continuous round-trip audio latency SHOULD be 10 milliseconds or less over the USB host mode port using USB audio class.

If device implementations include an HDMI port, they:

• [C-4-1] MUST support output in stereo and eight channels at 20-bit or 24-bit depth and 192 kHz without bit-depth loss or resampling.

5.11. Capture for Unprocessed

Android includes support for recording of unprocessed audio via the android.media.MediaRecorder.AudioSource.UNPROCESSED audio source. In OpenSL ES, it can be accessed with the record preset SL_ANDROID_RECORDING_PRESET_UNPROCESSED .

If device implementations intent to support unprocessed audio source and make it available to third-party apps, they:

• [C-1-1] MUST report the support through the android.media.AudioManager property PROPERTY_SUPPORT_AUDIO_SOURCE_UNPROCESSED .

• [C-1-2] MUST exhibit approximately flat amplitude-versus-frequency characteristics in the mid-frequency range: specifically ±10dB from 100 Hz to 7000 Hz for each and every microphone used to record the unprocessed audio source.

• [C-1-3] MUST exhibit amplitude levels in the low frequency range: specifically from ±20 dB from 5 Hz to 100 Hz compared to the mid-frequency range for each and every microphone used to record the unprocessed audio source.

• [C-1-4] MUST exhibit amplitude levels in the high frequency range: specifically from ±30 dB from 7000 Hz to 22 KHz compared to the mid-frequency range for each and every microphone used to record the unprocessed audio source.

• [C-1-5] MUST set audio input sensitivity such that a 1000 Hz sinusoidal tone source played at 94 dB Sound Pressure Level (SPL) yields a response with RMS of 520 for 16 bit-samples (or -36 dB Full Scale for floating point/double precision samples) for each and every microphone used to record the unprocessed audio source.

• [C-1-6] MUST have a signal-to-noise ratio (SNR) at 60 dB or higher for each and every microphone used to record the unprocessed audio source. (whereas the SNR is measured as the difference between 94 dB SPL and equivalent SPL of self noise, A-weighted).

• [C-1-7] MUST have a total harmonic distortion (THD) less than be less than 1% for 1 kHZ at 90 dB SPL input level at each and every microphone used to record the unprocessed audio source.

• MUST not have any other signal processing (eg Automatic Gain Control, High Pass Filter, or Echo cancellation) in the path other than a level multiplier to bring the level to desired range. In other words:

• [C-1-8] If any signal processing is present in the architecture for any reason, it MUST be disabled and effectively introduce zero delay or extra latency to the signal path.
• [C-1-9] The level multiplier, while allowed to be on the path, MUST NOT introduce delay or latency to the signal path.

All SPL measurements are made directly next to the microphone under test. For multiple microphone configurations, these requirements apply to each microphone.

If device implementations declare android.hardware.microphone but do not support unprocessed audio source, they:

• [C-2-1] MUST return null for the AudioManager.getProperty(PROPERTY_SUPPORT_AUDIO_SOURCE_UNPROCESSED) API method, to properly indicate the lack of support.
• [SR] are still STRONGLY RECOMMENDED to satisfy as many of the requirements for the signal path for the unprocessed recording source.

6. Developer Tools and Options Compatibility

6.1. Developer Tools

پیاده سازی دستگاه:

• [C-0-1] MUST support the Android Developer Tools provided in the Android SDK.

• Android Debug Bridge (adb)

  • [C-0-2] MUST support all adb functions as documented in the Android SDK including dumpsys .
  • [C-0-3] MUST NOT alter the format or the contents of device system events (batterystats , diskstats, fingerprint, graphicsstats, netstats, notification, procstats) logged via dumpsys.
  • [C-0-4] MUST have the device-side adb daemon be inactive by default and there MUST be a user-accessible mechanism to turn on the Android Debug Bridge.
  • [C-0-5] MUST support secure adb. Android includes support for secure adb. Secure adb enables adb on known authenticated hosts.

  • [C-0-6] MUST provide a mechanism allowing adb to be connected from a host machine. مثلا:

    • Device implementations without a USB port supporting peripheral mode MUST implement adb via local-area network (such as Ethernet or Wi-Fi).
    • MUST provide drivers for Windows 7, 9 and 10, allowing developers to connect to the device using the adb protocol.

• Dalvik Debug Monitor Service (ddms)

  • [C-0-7] MUST support all ddms features as documented in the Android SDK. As ddms uses adb, support for ddms SHOULD be inactive by default, but MUST be supported whenever the user has activated the Android Debug Bridge, as above.
• Monkey
  • [C-0-8] MUST include the Monkey framework and make it available for applications to use.
• SysTrace
  • [C-0-9] MUST support systrace tool as documented in the Android SDK. Systrace must be inactive by default and there MUST be a user-accessible mechanism to turn on Systrace.

6.2. Developer Options

Android includes support for developers to configure application development-related settings.

Device implementations MUST provide a consistent experience for Developer Options, they:

• [C-0-1] MUST honor the android.settings.APPLICATION_DEVELOPMENT_SETTINGS intent to show application development-related settings. The upstream Android implementation hides the Developer Options menu by default and enables users to launch Developer Options after pressing seven (7) times on the Settings > About Device > Build Number menu item.
• [C-0-2] MUST hide Developer Options by default and MUST provide a mechanism to enable Developer Options without the need for any special allowlisting.
• MAY temporarily limit access to the Developer Options menu, by visually hiding or disabling the menu, to prevent distraction for scenarios where the safety of the user is of concern.

7. Hardware Compatibility

If a device includes a particular hardware component that has a corresponding API for third-party developers:

• [C-0-1] The device implementation MUST implement that API as described in the Android SDK documentation.

If an API in the SDK interacts with a hardware component that is stated to be optional and the device implementation does not possess that component:

• [C-0-2] Complete class definitions (as documented by the SDK) for the component APIs MUST still be presented.
• [C-0-3] The API's behaviors MUST be implemented as no-ops in some reasonable fashion.
• [C-0-4] API methods MUST return null values where permitted by the SDK documentation.
• [C-0-5] API methods MUST return no-op implementations of classes where null values are not permitted by the SDK documentation.
• [C-0-6] API methods MUST NOT throw exceptions not documented by the SDK documentation.
• [C-0-7] Device implementations MUST consistently report accurate hardware configuration information via the getSystemAvailableFeatures() and hasSystemFeature(String) methods on the android.content.pm.PackageManager class for the same build fingerprint.

A typical example of a scenario where these requirements apply is the telephony API: Even on non-phone devices, these APIs must be implemented as reasonable no-ops.

7.1. Display and Graphics

Android includes facilities that automatically adjust application assets and UI layouts appropriately for the device to ensure that third-party applications run well on a variety of hardware configurations . Devices MUST properly implement these APIs and behaviors, as detailed in this section.

The units referenced by the requirements in this section are defined as follows:

• physical diagonal size . The distance in inches between two opposing corners of the illuminated portion of the display.
• dots per inch (dpi) . The number of pixels encompassed by a linear horizontal or vertical span of 1”. Where dpi values are listed, both horizontal and vertical dpi must fall within the range.
• aspect ratio . The ratio of the pixels of the longer dimension to the shorter dimension of the screen. For example, a display of 480x854 pixels would be 854/480 = 1.779, or roughly “16:9”.
• density-independent pixel (dp) . The virtual pixel unit normalized to a 160 dpi screen, calculated as: pixels = dps * (density/160).

7.1.1. Screen Configuration

7.1.1.1. Screen Size

The Android UI framework supports a variety of different logical screen layout sizes, and allows applications to query the current configuration's screen layout size via Configuration.screenLayout with the SCREENLAYOUT_SIZE_MASK and Configuration.smallestScreenWidthDp .

• [C-0-1] Device implementations MUST report the correct layout size for the Configuration.screenLayout as defined in the Android SDK documentation. Specifically, device implementations MUST report the correct logical density-independent pixel (dp) screen dimensions as below:

  • Devices with the Configuration.uiMode set as any value other than UI_MODE_TYPE_WATCH, and reporting a small size for the Configuration.screenLayout , MUST have at least 426 dp x 320 dp.
  • Devices reporting a normal size for the Configuration.screenLayout , MUST have at least 480 dp x 320 dp.
  • Devices reporting a large size for the Configuration.screenLayout , MUST have at least 640 dp x 480 dp.
  • Devices reporting a xlarge size for the Configuration.screenLayout , MUST have at least 960 dp x 720 dp.

• [C-0-2] Device implementations MUST correctly honor applications' stated support for screen sizes through the < supports-screens > attribute in the AndroidManifest.xml, as described in the Android SDK documentation.

7.1.1.2. Screen Aspect Ratio

While there is no restriction to the screen aspect ratio value of the physical screen display, the screen aspect ratio of the logical display that third-party apps are rendered within, as can be derived from the height and width values reported through the view.Display APIs and Configuration API, MUST meet the following requirements:

• [C-0-1] Device implementations with the Configuration.uiMode set as UI_MODE_TYPE_NORMAL MUST have an aspect ratio value between 1.3333 (4:3) and 1.86 (roughly 16:9), unless the app can be deemed as ready to be stretched longer by meeting one of the following conditions:

  • The app has declared that it supports a larger screen aspect ratio through the android.max_aspect metadata value.
  • The app declares it is resizeable via the android:resizeableActivity attribute.
  • The app is targeting API level 26 or higher and does not declare a android:MaxAspectRatio that would restrict the allowed aspect ratio.

• [C-0-2] Device implementations with the Configuration.uiMode set as UI_MODE_TYPE_WATCH MUST have an aspect ratio value set as 1.0 (1:1).

7.1.1.3. Screen Density

The Android UI framework defines a set of standard logical densities to help application developers target application resources.

• [C-0-1] By default, device implementations MUST report only one of the following logical Android framework densities through the DENSITY_DEVICE_STABLE API and this value MUST NOT change at any time; however, the device MAY report a different arbitrary density according to the display configuration changes made by the user (for example, display size) set after initial boot.

  • 120 dpi (ldpi)
  • 160 dpi (mdpi)
  • 213 dpi (tvdpi)
  • 240 dpi (hdpi)
  • 260 dpi (260dpi)
  • 280 dpi (280dpi)
  • 300 dpi (300dpi)
  • 320 dpi (xhdpi)
  • 340 dpi (340dpi)
  • 360 dpi (360dpi)
  • 400 dpi (400dpi)
  • 420 dpi (420dpi)
  • 480 dpi (xxhdpi)
  • 560 dpi (560dpi)
  • 640 dpi (xxxhdpi)

• Device implementations SHOULD define the standard Android framework density that is numerically closest to the physical density of the screen, unless that logical density pushes the reported screen size below the minimum supported. If the standard Android framework density that is numerically closest to the physical density results in a screen size that is smaller than the smallest supported compatible screen size (320 dp width), device implementations SHOULD report the next lowest standard Android framework density.

If there is an affordance to change the display size of the device:

• [C-1-1] The display size MUST NOT be scaled any larger than 1.5 times the native density or produce an effective minimum screen dimension smaller than 320dp (equivalent to resource qualifier sw320dp), whichever comes first.
• [C-1-2] Display size MUST NOT be scaled any smaller than 0.85 times the native density.
• To ensure good usability and consistent font sizes, it is RECOMMENDED that the following scaling of Native Display options be provided (while complying with the limits specified above)
• Small: 0.85x
• Default: 1x (Native display scale)
• Large: 1.15x
• Larger: 1.3x
• Largest 1.45x

7.1.2. Display Metrics

If device implementations include a screen or video output, they:

• [C-1-1] MUST report correct values for all display metrics defined in the android.util.DisplayMetrics API.

If device implementations does not include an embedded screen or video output, they:

• [C-2-1] MUST report reasonable values for all display metrics defined in the android.util.DisplayMetrics API for the emulated default view.Display .

7.1.3. Screen Orientation

پیاده سازی دستگاه:

• [C-0-1] MUST report which screen orientations they support ( android.hardware.screen.portrait and/or android.hardware.screen.landscape ) and MUST report at least one supported orientation. For example, a device with a fixed orientation landscape screen, such as a television or laptop, SHOULD only report android.hardware.screen.landscape .
• [C-0-2] MUST report the correct value for the device's current orientation, whenever queried via the android.content.res.Configuration.orientation , android.view.Display.getOrientation() , or other APIs.

If device implementations support both screen orientations, they:

• [C-1-1] MUST support dynamic orientation by applications to either portrait or landscape screen orientation. That is, the device must respect the application's request for a specific screen orientation.
• [C-1-2] MUST NOT change the reported screen size or density when changing orientation.
• MAY select either portrait or landscape orientation as the default.

7.1.4. 2D and 3D Graphics Acceleration

7.1.4.1 OpenGL ES

پیاده سازی دستگاه:

• [C-0-1] MUST correctly identify the supported OpenGL ES versions (1.1, 2.0, 3.0, 3.1, 3.2) through the managed APIs (such as via the GLES10.getString() method) and the native APIs.
• [C-0-2] MUST include the support for all the corresponding managed APIs and native APIs for every OpenGL ES versions they identified to support.

If device implementations include a screen or video output, they:

• [C-1-1] MUST support both OpenGL ES 1.0 and 2.0, as embodied and detailed in the Android SDK documentation .
• [SR] are STRONGLY RECOMMENDED to support OpenGL ES 3.0.
• SHOULD support OpenGL ES 3.1 or 3.2.

If device implementations support any of the OpenGL ES versions, they:

• [C-2-1] MUST report via the OpenGL ES managed APIs and native APIs any other OpenGL ES extensions they have implemented, and conversely MUST NOT report extension strings that they do not support.
• [C-2-2] MUST support the EGL_KHR_image , EGL_KHR_image_base , EGL_ANDROID_image_native_buffer , EGL_ANDROID_get_native_client_buffer , EGL_KHR_wait_sync , EGL_KHR_get_all_proc_addresses , EGL_ANDROID_presentation_time , EGL_KHR_swap_buffers_with_damage and EGL_ANDROID_recordable extensions.
• [SR] are STRONGLY RECOMMENDED to support EGL_KHR_partial_update.
• SHOULD accurately report via the getString() method, any texture compression format that they support, which is typically vendor-specific.

If device implementations declare support for OpenGL ES 3.0, 3.1, or 3.2, they:

• [C-3-1] MUST export the corresponding function symbols for these version in addition to the OpenGL ES 2.0 function symbols in the libGLESv2.so library.

If device implementations support OpenGL ES 3.2, they:

• [C-4-1] MUST support the OpenGL ES Android Extension Pack in its entirety.

If device implementations support the OpenGL ES Android Extension Pack in its entirety, they:

• [C-5-1] MUST identify the support through the android.hardware.opengles.aep feature flag.

If device implementations expose support for the EGL_KHR_mutable_render_buffer extension, they:

• [C-6-1] MUST also support the EGL_ANDROID_front_buffer_auto_refresh extension.

7.1.4.2 Vulkan

Android includes support for Vulkan , a low-overhead, cross-platform API for high-performance 3D graphics.

If device implementations support OpenGL ES 3.0 or 3.1, they:

• [SR] Are STRONGLY RECOMMENDED to include support for Vulkan 1.0 .

If device implementations include a screen or video output, they:

• SHOULD include support for Vulkan 1.0.

Device implementations, if including support for Vulkan 1.0:

• [C-1-1] MUST report the correct integer value with the android.hardware.vulkan.level and android.hardware.vulkan.version feature flags.
• [C-1-2] MUST enumerate, at least one VkPhysicalDevice for the Vulkan native API vkEnumeratePhysicalDevices() .
• [C-1-3] MUST fully implement the Vulkan 1.0 APIs for each enumerated VkPhysicalDevice .
• [C-1-4] MUST enumerate layers, contained in native libraries named as libVkLayer*.so in the application package's native library directory, through the Vulkan native APIs vkEnumerateInstanceLayerProperties() and vkEnumerateDeviceLayerProperties() .
• [C-1-5] MUST NOT enumerate layers provided by libraries outside of the application package, or provide other ways of tracing or intercepting the Vulkan API, unless the application has the android:debuggable attribute set as true .
• [C-1-6] MUST report all extension strings that they do support via the Vulkan native APIs , and conversely MUST NOT report extension strings that they do not correctly support.

Device implementations, if not including support for Vulkan 1.0:

• [C-2-1] MUST NOT declare any of the Vulkan feature flags (eg android.hardware.vulkan.level , android.hardware.vulkan.version ).
• [C-2-2] MUST NOT enumerate any VkPhysicalDevice for the Vulkan native API vkEnumeratePhysicalDevices() .

7.1.4.3 RenderScript

• [C-0-1] Device implementations MUST support Android RenderScript , as detailed in the Android SDK documentation.

7.1.4.4 2D Graphics Acceleration

Android includes a mechanism for applications to declare that they want to enable hardware acceleration for 2D graphics at the Application, Activity, Window, or View level through the use of a manifest tag android:hardwareAccelerated or direct API calls.

پیاده سازی دستگاه:

• [C-0-1] MUST enable hardware acceleration by default, and MUST disable hardware acceleration if the developer so requests by setting android:hardwareAccelerated="false” or disabling hardware acceleration directly through the Android View APIs.
• [C-0-2] MUST exhibit behavior consistent with the Android SDK documentation on hardware acceleration .

Android includes a TextureView object that lets developers directly integrate hardware-accelerated OpenGL ES textures as rendering targets in a UI hierarchy.

• [C-0-3] MUST support the TextureView API, and MUST exhibit consistent behavior with the upstream Android implementation.

7.1.4.5 Wide-gamut Displays

If device implementations claim support for wide-gamut displays through Display.isWideColorGamut() , they:

• [C-1-1] MUST have a color-calibrated display.
• [C-1-2] MUST have a display whose gamut covers the sRGB color gamut entirely in CIE 1931 xyY space.
• [C-1-3] MUST have a display whose gamut has an area of at least 90% of NTSC 1953 in CIE 1931 xyY space.
• [C-1-4] MUST support OpenGL ES 3.0, 3.1, or 3.2 and report it properly.
• [C-1-5] MUST advertise support for the EGL_KHR_no_config_context , EGL_EXT_pixel_format_float , EGL_KHR_gl_colorspace , EGL_EXT_colorspace_scrgb_linear , and EGL_GL_colorspace_display_p3 extensions.
• [SR] Are STRONGLY RECOMMENDED to support GL_EXT_sRGB .

Conversely, if device implementations do not support wide-gamut displays, they:

• [C-2-1] SHOULD cover 100% or more of sRGB in CIE 1931 xyY space, although the screen color gamut is undefined.

7.1.5. Legacy Application Compatibility Mode

Android specifies a “compatibility mode” in which the framework operates in a 'normal' screen size equivalent (320dp width) mode for the benefit of legacy applications not developed for old versions of Android that pre-date screen-size independence.

7.1.6. Screen Technology

The Android platform includes APIs that allow applications to render rich graphics to the display. Devices MUST support all of these APIs as defined by the Android SDK unless specifically allowed in this document.

پیاده سازی دستگاه:

• [C-0-1] MUST support displays capable of rendering 16-bit color graphics.
• SHOULD support displays capable of 24-bit color graphics.
• [C-0-2] MUST support displays capable of rendering animations.
• [C-0-3] MUST use the display technology that have a pixel aspect ratio (PAR) between 0.9 and 1.15. That is, the pixel aspect ratio MUST be near square (1.0) with a 10 ~ 15% tolerance.

7.1.7. Secondary Displays

Android includes support for secondary display to enable media sharing capabilities and developer APIs for accessing external displays.

If device implementations support an external display either via a wired, wireless, or an embedded additional display connection, they:

• [C-1-1] MUST implement the DisplayManager system service and API as described in the Android SDK documentation.

7.2. Input Devices

پیاده سازی دستگاه:

• [C-0-1] MUST include an input mechanism, such as a touchscreen or non-touch navigation , to navigate between the UI elements.

7.2.1. Keyboard

If device implementations include support for third-party Input Method Editor (IME) applications, they:

• [C-1-1] MUST declare the android.software.input_methods feature flag.
• [C-1-2] MUST implement fully Input Management Framework
• [C-1-3] MUST have a preloaded software keyboard.

Device implementations: [C-0-1] MUST NOT include a hardware keyboard that does not match one of the formats specified in android.content.res.Configuration.keyboard (QWERTY or 12-key). SHOULD include additional soft keyboard implementations. * MAY include a hardware keyboard.

7.2.2. Non-touch Navigation

Android includes support for d-pad, trackball, and wheel as mechanisms for non-touch navigation.

پیاده سازی دستگاه:

• [C-0-1] MUST report the correct value for android.content.res.Configuration.navigation .

If device implementations lack non-touch navigations, they:

• [C-1-1] MUST provide a reasonable alternative user interface mechanism for the selection and editing of text, compatible with Input Management Engines. The upstream Android open source implementation includes a selection mechanism suitable for use with devices that lack non-touch navigation inputs.

7.2.3. Navigation Keys

The Home , Recents , and Back functions typically provided via an interaction with a dedicated physical button or a distinct portion of the touch screen, are essential to the Android navigation paradigm and therefore, device implementations:

• [C-0-1] MUST provide a user affordance to launch installed applications that have an activity with the <intent-filter> set with ACTION=MAIN and CATEGORY=LAUNCHER or CATEGORY=LEANBACK_LAUNCHER for Television device implementations. The Home function SHOULD be the mechanism for this user affordance.
• SHOULD provide buttons for the Recents and Back function.

If the Home, Recents, or Back functions are provided, they:

• [C-1-1] MUST be accessible with a single action (eg tap, double-click or gesture) when any of them are accessible.
• [C-1-2] MUST provide a clear indication of which single action would trigger each function. Having a visible icon imprinted on the button, showing a software icon on the navigation bar portion of the screen, or walking the user through a guided step-by-step demo flow during the out-of-box setup experience are examples of such an indication.

پیاده سازی دستگاه:

• [SR] are STRONGLY RECOMMENDED to not provide the input mechanism for the Menu function as it is deprecated in favor of action bar since Android 4.0.

If device implementations provide the Menu function, they:

• [C-2-1] MUST display the action overflow button whenever the action overflow menu popup is not empty and the action bar is visible.
• [C-2-2] MUST NOT modify the position of the action overflow popup displayed by selecting the overflow button in the action bar, but MAY render the action overflow popup at a modified position on the screen when it is displayed by selecting the Menu function.

If device implementations do not provide the Menu function, for backwards compatibility, they:

• [C-3-1] MUST make the Menu function available to applications when targetSdkVersion is less than 10, either by a physical button, a software key, or gestures. This Menu function should be accessible unless hidden together with other navigation functions.

If device implementations provide the Assist function , they:

• [C-4-1] MUST make the Assist function accessible with a single action (eg tap, double-click or gesture) when other navigation keys are accessible.
• [SR] STRONGLY RECOMMENDED to use long press on HOME function as this designated interaction.

If device implementations use a distinct portion of the screen to display the navigation keys, they:

• [C-5-1] Navigation keys MUST use a distinct portion of the screen, not available to applications, and MUST NOT obscure or otherwise interfere with the portion of the screen available to applications.
• [C-5-2] MUST make available a portion of the display to applications that meets the requirements defined in section 7.1.1 .
• [C-5-3] MUST honor the flags set by the app through the View.setSystemUiVisibility() API method, so that this distinct portion of the screen (aka the navigation bar) is properly hidden away as documented in the SDK.

7.2.4. Touchscreen Input

Android includes support for a variety of pointer input systems, such as touchscreens, touch pads, and fake touch input devices. Touchscreen-based device implementations are associated with a display such that the user has the impression of directly manipulating items on screen. Since the user is directly touching the screen, the system does not require any additional affordances to indicate the objects being manipulated.

پیاده سازی دستگاه:

• SHOULD have a pointer input system of some kind (either mouse-like or touch).
• SHOULD support fully independently tracked pointers.

If device implementations include a touchscreen (single-touch or better), they:

• [C-1-1] MUST report TOUCHSCREEN_FINGER for the Configuration.touchscreen API field.
• [C-1-2] MUST report the android.hardware.touchscreen and android.hardware.faketouch feature flags

If device implementations include a touchscreen that can track more than a single touch, they:

• [C-2-1] MUST report the appropriate feature flags android.hardware.touchscreen.multitouch , android.hardware.touchscreen.multitouch.distinct , android.hardware.touchscreen.multitouch.jazzhand corresponding to the type of the specific touchscreen on the device.

If device implementations do not include a touchscreen (and rely on a pointer device only) and meet the fake touch requirements in section 7.2.5 , they:

• [C-3-1] MUST NOT report any feature flag starting with android.hardware.touchscreen and MUST report only android.hardware.faketouch .

7.2.5. Fake Touch Input

Fake touch interface provides a user input system that approximates a subset of touchscreen capabilities. For example, a mouse or remote control that drives an on-screen cursor approximates touch, but requires the user to first point or focus then click. Numerous input devices like the mouse, trackpad, gyro-based air mouse, gyro-pointer, joystick, and multi-touch trackpad can support fake touch interactions. Android includes the feature constant android.hardware.faketouch, which corresponds to a high-fidelity non-touch (pointer-based) input device such as a mouse or trackpad that can adequately emulate touch-based input (including basic gesture support), and indicates that the device supports an emulated subset of touchscreen functionality.

If device implementations do not include a touchscreen but include another pointer input system which they want to make available, they:

• SHOULD declare support for the android.hardware.faketouch feature flag.

If device implementations declare support for android.hardware.faketouch , they:

• [C-1-1] MUST report the absolute X and Y screen positions of the pointer location and display a visual pointer on the screen.
• [C-1-2] MUST report touch event with the action code that specifies the state change that occurs on the pointer going down or up on the screen .
• [C-1-3] MUST support pointer down and up on an object on the screen, which allows users to emulate tap on an object on the screen.
• [C-1-4] MUST support pointer down, pointer up, pointer down then pointer up in the same place on an object on the screen within a time threshold, which allows users to emulate double tap on an object on the screen.
• [C-1-5] MUST support pointer down on an arbitrary point on the screen, pointer move to any other arbitrary point on the screen, followed by a pointer up, which allows users to emulate a touch drag.
• [C-1-6] MUST support pointer down then allow users to quickly move the object to a different position on the screen and then pointer up on the screen, which allows users to fling an object on the screen.
• [C-1-7] MUST report TOUCHSCREEN_NOTOUCH for the Configuration.touchscreen API field.

If device implementations declare support for android.hardware.faketouch.multitouch.distinct , they:

• [C-2-1] MUST declare support for android.hardware.faketouch .
• [C-2-2] MUST support distinct tracking of two or more independent pointer inputs.

If device implementations declare support for android.hardware.faketouch.multitouch.jazzhand , they:

• [C-3-1] MUST declare support for android.hardware.faketouch .
• [C-3-2] MUST support distinct tracking of 5 (tracking a hand of fingers) or more pointer inputs fully independently.

7.2.6. Game Controller Support

7.2.6.1. Button Mappings

If device implementations declare the android.hardware.gamepad feature flag, they:

• [C-1-1] MUST have embed a controller or ship with a separate controller in the box, that would provide means to input all the events listed in the below tables.
• [C-1-2] MUST be capable to map HID events to it's associated Android view.InputEvent constants as listed in the below tables. The upstream Android implementation includes implementation for game controllers that satisfies this requirement.

1 KeyEvent

2 The above HID usages must be declared within a Game pad CA (0x01 0x0005).

3 This usage must have a Logical Minimum of 0, a Logical Maximum of 7, a Physical Minimum of 0, a Physical Maximum of 315, Units in Degrees, and a Report Size of 4. The logical value is defined to be the clockwise rotation away from the vertical axis; for example, a logical value of 0 represents no rotation and the up button being pressed, while a logical value of 1 represents a rotation of 45 degrees and both the up and left keys being pressed.

4 MotionEvent

1 MotionEvent

7.2.7. Remote Control

See Section 2.3.1 for device-specific requirements.

7.3. Sensors

If device implementations include a particular sensor type that has a corresponding API for third-party developers, the device implementation MUST implement that API as described in the Android SDK documentation and the Android Open Source documentation on sensors .

پیاده سازی دستگاه:

• [C-0-1] MUST accurately report the presence or absence of sensors per the android.content.pm.PackageManager class.
• [C-0-2] MUST return an accurate list of supported sensors via the SensorManager.getSensorList() and similar methods.
• [C-0-3] MUST behave reasonably for all other sensor APIs (for example, by returning true or false as appropriate when applications attempt to register listeners, not calling sensor listeners when the corresponding sensors are not present; etc.).

If device implementations include a particular sensor type that has a corresponding API for third-party developers, they:

• [C-1-1] MUST report all sensor measurements using the relevant International System of Units (metric) values for each sensor type as defined in the Android SDK documentation.
• [C-1-2] MUST report sensor data with a maximum latency of 100 milliseconds
• 2 * sample_time for the case of a sensor streamed with a minimum required latency of 5 ms + 2 * sample_time when the application processor is active. This delay does not include any filtering delays.
• [C-1-3] MUST report the first sensor sample within 400 milliseconds + 2 * sample_time of the sensor being activated. It is acceptable for this sample to have an accuracy of 0.

• [SR] SHOULD report the event time in nanoseconds as defined in the Android SDK documentation, representing the time the event happened and synchronized with the SystemClock.elapsedRealtimeNano() clock. Existing and new Android devices are STRONGLY RECOMMENDED to meet these requirements so they will be able to upgrade to the future platform releases where this might become a REQUIRED component. The synchronization error SHOULD be below 100 milliseconds.

• [C-1-7] For any API indicated by the Android SDK documentation to be a continuous sensor , device implementations MUST continuously provide periodic data samples that SHOULD have a jitter below 3%, where jitter is defined as the standard deviation of the difference of the reported timestamp values between consecutive events.

• [C-1-8] MUST ensure that the sensor event stream MUST NOT prevent the device CPU from entering a suspend state or waking up from a suspend state.

• When several sensors are activated, the power consumption SHOULD NOT exceed the sum of the individual sensor's reported power consumption.

The list above is not comprehensive; the documented behavior of the Android SDK and the Android Open Source Documentations on sensors is to be considered authoritative.

Some sensor types are composite, meaning they can be derived from data provided by one or more other sensors. (Examples include the orientation sensor and the linear acceleration sensor.)

پیاده سازی دستگاه:

• SHOULD implement these sensor types, when they include the prerequisite physical sensors as described in sensor types .

If device implementations include a composite sensor, they:

• [C-2-1] MUST implement the sensor as described in the Android Open Source documentation on composite sensors .

7.3.1. Accelerometer

• Device implementations SHOULD include a 3-axis accelerometer.

If device implementations include a 3-axis accelerometer, they:

• [C-1-1] MUST be able to report events up to a frequency of at least 50 Hz.
• [C-1-2] MUST implement and report TYPE_ACCELEROMETER sensor.
• [C-1-3] MUST comply with the Android sensor coordinate system as detailed in the Android APIs.
• [C-1-4] MUST be capable of measuring from freefall up to four times the gravity(4g) or more on any axis.
• [C-1-5] MUST have a resolution of at least 12-bits.
• [C-1-6] MUST have a standard deviation no greater than 0.05 m/s^, where the standard deviation should be calculated on a per axis basis on samples collected over a period of at least 3 seconds at the fastest sampling rate.
• [SR] are STRONGLY RECOMMENDED to implement the TYPE_SIGNIFICANT_MOTION composite sensor.
• [SR] are STRONGLY RECOMMENDED to implement the TYPE_ACCELEROMETER_UNCALIBRATED sensor if online accelerometer calibration is available.
• SHOULD implement the TYPE_SIGNIFICANT_MOTION , TYPE_TILT_DETECTOR , TYPE_STEP_DETECTOR , TYPE_STEP_COUNTER composite sensors as described in the Android SDK document.
• SHOULD report events up to at least 200 Hz.
• SHOULD have a resolution of at least 16-bits.
• SHOULD be calibrated while in use if the characteristics changes over the life cycle and compensated, and preserve the compensation parameters between device reboots.
• SHOULD be temperature compensated.
• SHOULD also implement TYPE_ACCELEROMETER_UNCALIBRATED sensor.

If device implementations include a 3-axis accelerometer and any of the TYPE_SIGNIFICANT_MOTION , TYPE_TILT_DETECTOR , TYPE_STEP_DETECTOR , TYPE_STEP_COUNTER composite sensors are implemented:

• [C-2-1] The sum of their power consumption MUST always be less than 4 mW.
• SHOULD each be below 2 mW and 0.5 mW for when the device is in a dynamic or static condition.

If device implementations include a 3-axis accelerometer and a gyroscope sensor, they:

• [C-3-1] MUST implement the TYPE_GRAVITY and TYPE_LINEAR_ACCELERATION composite sensors.
• SHOULD implement the TYPE_GAME_ROTATION_VECTOR composite sensor.
• [SR] Existing and new Android devices are STRONGLY RECOMMENDED to implement the TYPE_GAME_ROTATION_VECTOR sensor.

If device implementations include a 3-axis accelerometer, a gyroscope sensor and a magnetometer sensor, they:

• [C-4-1] MUST implement a TYPE_ROTATION_VECTOR composite sensor.

7.3.2. Magnetometer

• Device implementations SHOULD include a 3-axis magnetometer (compass).

If device implementations include a 3-axis magnetometer, they:

• [C-1-1] MUST implement the TYPE_MAGNETIC_FIELD sensor.
• [C-1-2] MUST be able to report events up to a frequency of at least 10 Hz and SHOULD report events up to at least 50 Hz.
• [C-1-3] MUST comply with the Android sensor coordinate system as detailed in the Android APIs.
• [C-1-4] MUST be capable of measuring between -900 µT and +900 µT on each axis before saturating.
• [C-1-5] MUST have a hard iron offset value less than 700 µT and SHOULD have a value below 200 µT, by placing the magnetometer far from dynamic (current-induced) and static (magnet-induced) magnetic fields.
• [C-1-6] MUST have a resolution equal or denser than 0.6 µT.
• [C-1-7] MUST support online calibration and compensation of the hard iron bias, and preserve the compensation parameters between device reboots.
• [C-1-8] MUST have the soft iron compensation applied—the calibration can be done either while in use or during the production of the device.
• [C-1-9] MUST have a standard deviation, calculated on a per axis basis on samples collected over a period of at least 3 seconds at the fastest sampling rate, no greater than 1.5 µT; SHOULD have a standard deviation no greater than 0.5 µT.
• SHOULD implement TYPE_MAGNETIC_FIELD_UNCALIBRATED sensor.
• [SR] Existing and new Android devices are STRONGLY RECOMMENDED to implement the TYPE_MAGNETIC_FIELD_UNCALIBRATED sensor.

If device implementations include a 3-axis magnetometer, an accelerometer sensor and a gyroscope sensor, they:

• [C-2-1] MUST implement a TYPE_ROTATION_VECTOR composite sensor.

If device implementations include a 3-axis magnetometer, an accelerometer, they:

• MAY implement the TYPE_GEOMAGNETIC_ROTATION_VECTOR sensor.

If device implementations include a 3-axis magnetometer, an accelerometer and TYPE_GEOMAGNETIC_ROTATION_VECTOR sensor, they:

• [C-3-1] MUST consume less than 10 mW.
• SHOULD consume less than 3 mW when the sensor is registered for batch mode at 10 Hz.

7.3.3. GPS

پیاده سازی دستگاه:

• SHOULD include a GPS/GNSS receiver.

If device implementations include a GPS/GNSS receiver and report the capability to applications through the android.hardware.location.gps feature flag, they:

• [C-1-1] MUST support location outputs at a rate of at least 1 Hz when requested via LocationManager#requestLocationUpdate .
• [C-1-2] MUST be able to determine the location in open-sky conditions (strong signals, negligible multipath, HDOP < 2) within 10 seconds (fast time to first fix), when connected to a 0.5 Mbps or faster data speed internet connection. This requirement is typically met by the use of some form of Assisted or Predicted GPS/GNSS technique to minimize GPS/GNSS lock-on time (Assistance data includes Reference Time, Reference Location and Satellite Ephemeris/Clock).
  • [SR] After making such a location calculation, it is STRONGLY RECOMMENDED for the device to be able to determine its location, in open sky, within 10 seconds, when location requests are restarted, up to an hour after the initial location calculation, even when the subsequent request is made without a data connection, and/or after a power cycle.

• In open sky conditions after determining the location, while stationary or moving with less than 1 meter per second squared of acceleration:

  • [C-1-3] MUST be able to determine location within 20 meters, and speed within 0.5 meters per second, at least 95% of the time.
  • [C-1-4] MUST simultaneously track and report via GnssStatus.Callback at least 8 satellites from one constellation.
  • SHOULD be able to simultaneously track at least 24 satellites, from multiple constellations (eg GPS + at least one of Glonass, Beidou, Galileo).
  • [C-1-5] MUST report the GNSS technology generation through the test API 'getGnssYearOfHardware'.
  • [SR] Continue to deliver normal GPS/GNSS location outputs during an emergency phone call.
  • [SR] Report GNSS measurements from all constellations tracked (as reported in GnssStatus messages), with the exception of SBAS.
  • [SR] Report AGC, and Frequency of GNSS measurement.
  • [SR] Report all accuracy estimates (including Bearing, Speed, and Vertical) as part of each GPS Location.
  • [SR] are STRONGLY RECOMMENDED to meet as many as possible from the additional mandatory requirements for devices reporting the year "2016" or "2017" through the Test API LocationManager.getGnssYearOfHardware() .

If device implementations include a GPS/GNSS receiver and report the capability to applications through the android.hardware.location.gps feature flag and the LocationManager.getGnssYearOfHardware() Test API reports the year "2016" or newer, they:

• [C-2-1] MUST report GPS measurements, as soon as they are found, even if a location calculated from GPS/GNSS is not yet reported.
• [C-2-2] MUST report GPS pseudoranges and pseudorange rates, that, in open-sky conditions after determining the location, while stationary or moving with less than 0.2 meter per second squared of acceleration, are sufficient to calculate position within 20 meters, and speed within 0.2 meters per second, at least 95% of the time.

If device implementations include a GPS/GNSS receiver and report the capability to applications through the android.hardware.location.gps feature flag and the LocationManager.getGnssYearOfHardware() Test API reports the year "2017" or newer, they:

• [C-3-1] MUST continue to deliver normal GPS/GNSS location outputs during an emergency phone call.
• [C-3-2] MUST report GNSS measurements from all constellations tracked (as reported in GnssStatus messages), with the exception of SBAS.
• [C-3-3] MUST report AGC, and Frequency of GNSS measurement.
• [C-3-4] MUST report all accuracy estimates (including Bearing, Speed, and Vertical) as part of each GPS Location.

7.3.4. Gyroscope

پیاده سازی دستگاه:

• SHOULD include a gyroscope (angular change sensor).
• SHOULD NOT include a gyroscope sensor unless a 3-axis accelerometer is also included.

If device implementations include a gyroscope, they:

• [C-1-1] MUST be able to report events up to a frequency of at least 50 Hz.
• [C-1-2] MUST implement the TYPE_GYROSCOPE sensor and SHOULD also implement TYPE_GYROSCOPE_UNCALIBRATED sensor.
• [C-1-3] MUST be capable of measuring orientation changes up to 1,000 degrees per second.
• [C-1-4] MUST have a resolution of 12-bits or more and SHOULD have a resolution of 16-bits or more.
• [C-1-5] MUST be temperature compensated.
• [C-1-6] MUST be calibrated and compensated while in use, and preserve the compensation parameters between device reboots.
• [C-1-7] MUST have a variance no greater than 1e-7 rad^2 / s^2 per Hz (variance per Hz, or rad^2 / s). The variance is allowed to vary with the sampling rate, but MUST be constrained by this value. In other words, if you measure the variance of the gyro at 1 Hz sampling rate it SHOULD be no greater than 1e-7 rad^2/s^2.
• [SR] Existing and new Android devices are STRONGLY RECOMMENDED to implement the SENSOR_TYPE_GYROSCOPE_UNCALIBRATED sensor.
• [SR] Calibration error is STRONGLY RECOMMENDED to be less than 0.01 rad/s when device is stationary at room temperature.
• SHOULD report events up to at least 200 Hz.

If device implementations include a gyroscope, an accelerometer sensor and a magnetometer sensor, they:

• [C-2-1] MUST implement a TYPE_ROTATION_VECTOR composite sensor.

If device implementations include a gyroscope and a accelerometer sensor, they:

• [C-3-1] MUST implement the TYPE_GRAVITY and TYPE_LINEAR_ACCELERATION composite sensors.
• [SR] Existing and new Android devices are STRONGLY RECOMMENDED to implement the TYPE_GAME_ROTATION_VECTOR sensor.
• SHOULD implement the TYPE_GAME_ROTATION_VECTOR composite sensor.

7.3.5. Barometer

• Device implementations SHOULD include a barometer (ambient air pressure sensor).

If device implementations include a barometer, they:

• [C-1-1] MUST implement and report TYPE_PRESSURE sensor.
• [C-1-2] MUST be able to deliver events at 5 Hz or greater.
• [C-1-3] MUST be temperature compensated.
• [SR] STRONGLY RECOMMENDED to be able to report pressure measurements in the range 300hPa to 1100hPa.
• SHOULD have an absolute accuracy of 1hPa.
• SHOULD have a relative accuracy of 0.12hPa over 20hPa range (equivalent to ~1m accuracy over ~200m change at sea level).

7.3.6. Thermometer

Device implementations: MAY include an ambient thermometer (temperature sensor). MAY but SHOULD NOT include a CPU temperature sensor.

If device implementations include an ambient thermometer (temperature sensor), they:

• [C-1-1] MUST be defined as SENSOR_TYPE_AMBIENT_TEMPERATURE and MUST measure the ambient (room/vehicle cabin) temperature from where the user is interacting with the device in degrees Celsius.
• [C-1-2] MUST be defined as SENSOR_TYPE_TEMPERATURE .
• [C-1-3] MUST measure the temperature of the device CPU.
• [C-1-4] MUST NOT measure any other temperature.

Note the SENSOR_TYPE_TEMPERATURE sensor type was deprecated in Android 4.0.

7.3.7. Photometer

• Device implementations MAY include a photometer (ambient light sensor).

7.3.8. Proximity Sensor

• Device implementations MAY include a proximity sensor.

If device implementations include a proximity sensor, they:

• [C-1-1] MUST measure the proximity of an object in the same direction as the screen. That is, the proximity sensor MUST be oriented to detect objects close to the screen, as the primary intent of this sensor type is to detect a phone in use by the user. If device implementations include a proximity sensor with any other orientation, it MUST NOT be accessible through this API.
• [C-1-2] MUST have 1-bit of accuracy or more.

7.3.9. High Fidelity Sensors

If device implementations include a set of higher quality sensors as defined in this section, and make available them to third-party apps, they:

• [C-1-1] MUST identify the capability through the android.hardware.sensor.hifi_sensors feature flag.

If device implementations declare android.hardware.sensor.hifi_sensors , they:

• [C-2-1] MUST have a TYPE_ACCELEROMETER sensor which:

  • MUST have a measurement range between at least -8g and +8g.
  • MUST have a measurement resolution of at least 1024 LSB/G.
  • MUST have a minimum measurement frequency of 12.5 Hz or lower.
  • MUST have a maximum measurement frequency of 400 Hz or higher.
  • MUST have a measurement noise not above 400 uG/√Hz.
  • MUST implement a non-wake-up form of this sensor with a buffering capability of at least 3000 sensor events.
  • MUST have a batching power consumption not worse than 3 mW.
  • SHOULD have a stationary noise bias stability of \<15 μg √Hz from 24hr static dataset.
  • SHOULD have a bias change vs. temperature of ≤ +/- 1mg / °C.
  • SHOULD have a best-fit line non-linearity of ≤ 0.5%, and sensitivity change vs. temperature of ≤ 0.03%/C°.
  • SHOULD have white noise spectrum to ensure adequate qualification of sensor's noise integrity.

• [C-2-2] MUST have a TYPE_ACCELEROMETER_UNCALIBRATED with the same quality requirements as TYPE_ACCELEROMETER .

• [C-2-3] MUST have a TYPE_GYROSCOPE sensor which:

  • MUST have a measurement range between at least -1000 and +1000 dps.
  • MUST have a measurement resolution of at least 16 LSB/dps.
  • MUST have a minimum measurement frequency of 12.5 Hz or lower.
  • MUST have a maximum measurement frequency of 400 Hz or higher.
  • MUST have a measurement noise not above 0.014°/s/√Hz.
  • SHOULD have a stationary bias stability of < 0.0002 °/s √Hz from 24-hour static dataset.
  • SHOULD have a bias change vs. temperature of ≤ +/- 0.05 °/ s / °C.
  • SHOULD have a sensitivity change vs. temperature of ≤ 0.02% / °C.
  • SHOULD have a best-fit line non-linearity of ≤ 0.2%.
  • SHOULD have a noise density of ≤ 0.007 °/s/√Hz.
  • SHOULD have white noise spectrum to ensure adequate qualification of sensor's noise integrity.
  • SHOULD have calibration error less than 0.002 rad/s in temperature range 10 ~ 40 ℃ when device is stationary.

• [C-2-4] MUST have a TYPE_GYROSCOPE_UNCALIBRATED with the same quality requirements as TYPE_GYROSCOPE .

• [C-2-5] MUST have a TYPE_GEOMAGNETIC_FIELD sensor which:
  • MUST have a measurement range between at least -900 and +900 uT.
  • MUST have a measurement resolution of at least 5 LSB/uT.
  • MUST have a minimum measurement frequency of 5 Hz or lower.
  • MUST have a maximum measurement frequency of 50 Hz or higher.
  • MUST have a measurement noise not above 0.5 uT.
• [C-2-6] MUST have a TYPE_MAGNETIC_FIELD_UNCALIBRATED with the same quality requirements as TYPE_GEOMAGNETIC_FIELD and in addition:
  • MUST implement a non-wake-up form of this sensor with a buffering capability of at least 600 sensor events.
  • SHOULD have white noise spectrum to ensure adequate qualification of sensor's noise integrity.
• [C-2-7] MUST have a TYPE_PRESSURE sensor which:
  • MUST have a measurement range between at least 300 and 1100 hPa.
  • MUST have a measurement resolution of at least 80 LSB/hPa.
  • MUST have a minimum measurement frequency of 1 Hz or lower.
  • MUST have a maximum measurement frequency of 10 Hz or higher.
  • MUST have a measurement noise not above 2 Pa/√Hz.
  • MUST implement a non-wake-up form of this sensor with a buffering capability of at least 300 sensor events.
  • MUST have a batching power consumption not worse than 2 mW.
• [C-2-8] MUST have a TYPE_GAME_ROTATION_VECTOR sensor which:
  • MUST implement a non-wake-up form of this sensor with a buffering capability of at least 300 sensor events.
  • MUST have a batching power consumption not worse than 4 mW.
• [C-2-9] MUST have a TYPE_SIGNIFICANT_MOTION sensor which:
  • MUST have a power consumption not worse than 0.5 mW when device is static and 1.5 mW when device is moving.
• [C-2-10] MUST have a TYPE_STEP_DETECTOR sensor which:
  • MUST implement a non-wake-up form of this sensor with a buffering capability of at least 100 sensor events.
  • MUST have a power consumption not worse than 0.5 mW when device is static and 1.5 mW when device is moving.
  • MUST have a batching power consumption not worse than 4 mW.
• [C-2-11] MUST have a TYPE_STEP_COUNTER sensor which:
  • MUST have a power consumption not worse than 0.5 mW when device is static and 1.5 mW when device is moving.
• [C-2-12] MUST have a TILT_DETECTOR sensor which:
  • MUST have a power consumption not worse than 0.5 mW when device is static and 1.5 mW when device is moving.
• [C-2-13] The event timestamp of the same physical event reported by the Accelerometer, Gyroscope sensor and Magnetometer MUST be within 2.5 milliseconds of each other.
• [C-2-14] MUST have Gyroscope sensor event timestamps on the same time base as the camera subsystem and within 1 milliseconds of error.
• [C-2-15] MUST deliver samples to applications within 5 milliseconds from the time when the data is available on any of the above physical sensors to the application.
• [C-2-16] MUST not have a power consumption higher than 0.5 mW when device is static and 2.0 mW when device is moving when any combination of the following sensors are enabled:
  • SENSOR_TYPE_SIGNIFICANT_MOTION
  • SENSOR_TYPE_STEP_DETECTOR
  • SENSOR_TYPE_STEP_COUNTER
  • SENSOR_TILT_DETECTORS
• [C-2-17] MAY have a TYPE_PROXIMITY sensor, but if present MUST have a minimum buffer capability of 100 sensor events.

Note that all power consumption requirements in this section do not include the power consumption of the Application Processor. It is inclusive of the power drawn by the entire sensor chain—the sensor, any supporting circuitry, any dedicated sensor processing system, etc.

If device implementations include direct sensor support, they:

• [C-3-1] MUST correctly declare support of direct channel types and direct report rates level through the isDirectChannelTypeSupported and getHighestDirectReportRateLevel API.
• [C-3-2] MUST support at least one of the two sensor direct channel types for all sensors that declare support for sensor direct channel
• TYPE_HARDWARE_BUFFER
• TYPE_MEMORY_FILE
• SHOULD support event reporting through sensor direct channel for primary sensor (non-wakeup variant) of the following types:
• TYPE_ACCELEROMETER
• TYPE_ACCELEROMETER_UNCALIBRATED
• TYPE_GYROSCOPE
• TYPE_GYROSCOPE_UNCALIBRATED
• TYPE_MAGNETIC_FIELD
• TYPE_MAGNETIC_FIELD_UNCALIBRATED

7.3.10. Fingerprint Sensor

If device implementations include a secure lock screen, they:

• SHOULD include a fingerprint sensor.

If device implementations include a fingerprint sensor and make the sensor available to third-party apps, they:

• [C-1-1] MUST declare support for the android.hardware.fingerprint feature.
• [C-1-2] MUST fully implement the corresponding API as described in the Android SDK documentation.
• [C-1-3] MUST have a false acceptance rate not higher than 0.002%.
• [SR] Are STRONGLY RECOMMENDED to have a spoof and imposter acceptance rate not higher than 7%.
• [C-1-4] MUST disclose that this mode may be less secure than a strong PIN, pattern, or password and clearly enumerate the risks of enabling it, if the spoof and imposter acceptance rates are higher than 7%.
• [C-1-5] MUST rate limit attempts for at least 30 seconds after five false trials for fingerprint verification.
• [C-1-6] MUST have a hardware-backed keystore implementation, and perform the fingerprint matching in a Trusted Execution Environment (TEE) or on a chip with a secure channel to the TEE.
• [C-1-7] MUST have all identifiable fingerprint data encrypted and cryptographically authenticated such that they cannot be acquired, read or altered outside of the Trusted Execution Environment (TEE) as documented in the implementation guidelines on the Android Open Source Project site.
• [C-1-8] MUST prevent adding a fingerprint without first establishing a chain of trust by having the user confirm existing or add a new device credential (PIN/pattern/password) that's secured by TEE; the Android Open Source Project implementation provides the mechanism in the framework to do so.
• [C-1-9] MUST NOT enable 3rd-party applications to distinguish between individual fingerprints.
• [C-1-10] MUST honor the DevicePolicyManager.KEYGUARD_DISABLE_FINGERPRINT flag.
• [C-1-11] MUST, when upgraded from a version earlier than Android 6.0, have the fingerprint data securely migrated to meet the above requirements or removed.
• [SR] Are STRONGLY RECOMMENDED to have a false rejection rate of less than 10%, as measured on the device.
• [SR] Are STRONGLY RECOMMENDED to have a latency below 1 second, measured from when the fingerprint sensor is touched until the screen is unlocked, for one enrolled finger.
• SHOULD use the Android Fingerprint icon provided in the Android Open Source Project.

7.3.11. Android Automotive-only sensors

Automotive-specific sensors are defined in the android.car.CarSensorManager API .

7.3.11.1. Current Gear

See Section 2.5.1 for device-specific requirements.

7.3.11.2. Day Night Mode

See Section 2.5.1 for device-specific requirements.

7.3.11.3. Driving Status

See Section 2.5.1 for device-specific requirements.

7.3.11.4. Wheel Speed

See Section 2.5.1 for device-specific requirements.

7.3.12. Pose Sensor

پیاده سازی دستگاه:

• MAY support pose sensor with 6 degrees of freedom.

If device implementations support pose sensor with 6 degrees of freedom, they:

• [C-1-1] MUST implement and report TYPE_POSE_6DOF sensor.
• [C-1-2] MUST be more accurate than the rotation vector alone.

7.4. Data Connectivity

7.4.1. Telephony

“Telephony” as used by the Android APIs and this document refers specifically to hardware related to placing voice calls and sending SMS messages via a GSM or CDMA network. While these voice calls may or may not be packet-switched, they are for the purposes of Android considered independent of any data connectivity that may be implemented using the same network. In other words, the Android “telephony” functionality and APIs refer specifically to voice calls and SMS. For instance, device implementations that cannot place calls or send/receive SMS messages are not considered a telephony device, regardless of whether they use a cellular network for data connectivity.

• Android MAY be used on devices that do not include telephony hardware. That is, Android is compatible with devices that are not phones.

If device implementations include GSM or CDMA telephony, they:

• [C-1-1] MUST declare the android.hardware.telephony feature flag and other sub-feature flags according to the technology.
• [C-1-2] MUST implement full support for the API for that technology.

If device implementations do not include telephony hardware, they:

• [C-2-1] MUST implement the full APIs as no-ops.

7.4.1.1. Number Blocking Compatibility

If device implementations report the android.hardware.telephony feature , they:

• [C-1-1] MUST include number blocking support
• [C-1-2] MUST fully implement BlockedNumberContract and the corresponding API as described in the SDK documentation.
• [C-1-3] MUST block all calls and messages from a phone number in 'BlockedNumberProvider' without any interaction with apps. The only exception is when number blocking is temporarily lifted as described in the SDK documentation.
• [C-1-4] MUST NOT write to the platform call log provider for a blocked call.
• [C-1-5] MUST NOT write to the Telephony provider for a blocked message.
• [C-1-6] MUST implement a blocked numbers management UI, which is opened with the intent returned by TelecomManager.createManageBlockedNumbersIntent() method.
• [C-1-7] MUST NOT allow secondary users to view or edit the blocked numbers on the device as the Android platform assumes the primary user to have full control of the telephony services, a single instance, on the device. All blocking related UI MUST be hidden for secondary users and the blocked list MUST still be respected.
• SHOULD migrate the blocked numbers into the provider when a device updates to Android 7.0.

7.4.1.2. Telecom API

اگر پیاده‌سازی‌های دستگاه android.hardware.telephony را گزارش کنند، آنها:

• [C-SR] Are STRONGLY RECOMMENDED to handle the the audio headset's KEYCODE_MEDIA_PLAY_PAUSE and KEYCODE_HEADSETHOOK events for the android.telecom APIs as below:
  • Call Connection.onDisconnect() when a short press of the key event is detected during an ongoing call.
  • Call Connection.onAnswer() when a short press of the key event is detected during an incoming call.
  • Call Connection.onReject() when a long press of the key event is detected during an incoming call.
  • Toggle the mute status of the CallAudioState

7.4.2. IEEE 802.11 (Wi-Fi)

پیاده سازی دستگاه:

• SHOULD include support for one or more forms of 802.11.

If device implementations include support for 802.11 and expose the functionality to a third-party application, they

• [C-1-1] MUST implement the corresponding Android API.
• [C-1-2] MUST report the hardware feature flag android.hardware.wifi .
• [C-1-3] MUST implement the multicast API as described in the SDK documentation.
• [C-1-4] MUST support multicast DNS (mDNS) and MUST NOT filter mDNS packets (224.0.0.251) at any time of operation including:
  • Even when the screen is not in an active state.
  • For Android Television device implementations, even when in standby power states.
• SHOULD randomize the source MAC address and sequence number of probe request frames, once at the beginning of each scan, while STA is disconnected.
  • Each group of probe request frames comprising one scan should use one consistent MAC address (SHOULD NOT randomize MAC address halfway through a scan).
  • Probe request sequence number should iterate as normal (sequentially) between the probe requests in a scan
  • Probe request sequence number should randomize between the last probe request of a scan and the first probe request of the next scan
• SHOULD only allow the following information elements in probe request frames, while STA is disconnected:
  • SSID Parameter Set (0)
  • DS Parameter Set (3)

7.4.2.1. Wi-Fi Direct

پیاده سازی دستگاه:

• SHOULD include support for Wi-Fi Direct (Wi-Fi peer-to-peer).

If device implementations include support for Wi-Fi Direct, they:

• [C-1-1] MUST implement the corresponding Android API as described in the SDK documentation.
• [C-1-2] MUST report the hardware feature android.hardware.wifi.direct .
• [C-1-3] MUST support regular Wi-Fi operation.
• SHOULD support Wi-Fi and Wi-Fi Direct operations concurrently.

7.4.2.2. Wi-Fi Tunneled Direct Link Setup

پیاده سازی دستگاه:

• SHOULD include support for Wi-Fi Tunneled Direct Link Setup (TDLS) as described in the Android SDK Documentation.

If device implementations include support for TDLS and TDLS is enabled by the WiFiManager API, they:

• [C-1-1] MUST declare support for TDLS through WifiManager.isTdlsSupported .
• SHOULD use TDLS only when it is possible AND beneficial.
• SHOULD have some heuristic and NOT use TDLS when its performance might be worse than going through the Wi-Fi access point.

7.4.2.3. Wi-Fi Aware

پیاده سازی دستگاه:

• SHOULD include support for Wi-Fi Aware .

If device implementations include support for Wi-Fi Aware and expose the functionality to third-party apps, then they:

• [C-1-1] MUST implement the WifiAwareManager APIs as described in the SDK documentation .
• [C-1-2] MUST declare the android.hardware.wifi.aware feature flag.
• [C-1-3] MUST support Wi-Fi and Wi-Fi Aware operations concurrently.
• [C-1-4] MUST randomize the Wi-Fi Aware management interface address at intervals no longer then 30 minutes and whenever Wi-Fi Aware is enabled.

7.4.2.4. Wi-Fi Passpoint

پیاده سازی دستگاه:

• SHOULD include support for Wi-Fi Passpoint .

If device implementations include support for Wi-Fi Passpoint, they:

• [C-1-1] MUST implement the Passpoint related WifiManager APIs as described in the SDK documentation .
• [C-1-2] MUST support IEEE 802.11u standard, specifically related to Network Discovery and Selection, such as Generic Advertisement Service (GAS) and Access Network Query Protocol (ANQP).

Conversely if device implementations do not include support for Wi-Fi Passpoint:

• [C-2-1] The implementation of the Passpoint related WifiManager APIs MUST throw an UnsupportedOperationException .

7.4.3. Bluetooth

If device implementations support Bluetooth Audio profile, they:

• SHOULD support Advanced Audio Codecs and Bluetooth Audio Codecs (eg LDAC).

If device implementations declare android.hardware.vr.high_performance feature, they:

• [C-1-1] MUST support Bluetooth 4.2 and Bluetooth LE Data Length Extension.

Android includes support for Bluetooth and Bluetooth Low Energy .

If device implementations include support for Bluetooth and Bluetooth Low Energy, they:

• [C-2-1] MUST declare the relevant platform features ( android.hardware.bluetooth and android.hardware.bluetooth_le respectively) and implement the platform APIs.
• SHOULD implement relevant Bluetooth profiles such as A2DP, AVCP, OBEX, etc. as appropriate for the device.

If device implementations include support for Bluetooth Low Energy, they:

• [C-3-1] MUST declare the hardware feature android.hardware.bluetooth_le .
• [C-3-2] MUST enable the GATT (generic attribute profile) based Bluetooth APIs as described in the SDK documentation and android.bluetooth .
• [C-3-3] MUST report the correct value for BluetoothAdapter.isOffloadedFilteringSupported() to indicate whether the filtering logic for the ScanFilter API classes is implemented.
• [C-3-4] MUST report the correct value for BluetoothAdapter.isMultipleAdvertisementSupported() to indicate whether Low Energy Advertising is supported.
• SHOULD support offloading of the filtering logic to the bluetooth chipset when implementing the ScanFilter API .
• SHOULD support offloading of the batched scanning to the bluetooth chipset.

• SHOULD support multi advertisement with at least 4 slots.

• [SR] STRONGLY RECOMMENDED to implement a Resolvable Private Address (RPA) timeout no longer than 15 minutes and rotate the address at timeout to protect user privacy.

7.4.4. Near-Field Communications

پیاده سازی دستگاه:

• SHOULD include a transceiver and related hardware for Near-Field Communications (NFC).
• [C-0-1] MUST implement android.nfc.NdefMessage and android.nfc.NdefRecord APIs even if they do not include support for NFC or declare the android.hardware.nfc feature as the classes represent a protocol-independent data representation format.

If device implementations include NFC hardware and plan to make it available to third-party apps, they:

• [C-1-1] MUST report the android.hardware.nfc feature from the android.content.pm.PackageManager.hasSystemFeature() method .
• MUST be capable of reading and writing NDEF messages via the following NFC standards as below:
• [C-1-2] MUST be capable of acting as an NFC Forum reader/writer (as defined by the NFC Forum technical specification NFCForum-TS-DigitalProtocol-1.0) via the following NFC standards:
• NfcA (ISO14443-3A)
• NfcB (ISO14443-3B)
• NfcF (JIS X 6319-4)
• IsoDep (ISO 14443-4)
• NFC Forum Tag Types 1, 2, 3, 4, 5 (defined by the NFC Forum)

• [SR] STRONGLY RECOMMENDED to be capable of reading and writing NDEF messages as well as raw data via the following NFC standards. Note that while the NFC standards are stated as STRONGLY RECOMMENDED, the Compatibility Definition for a future version is planned to change these to MUST. These standards are optional in this version but will be required in future versions. Existing and new devices that run this version of Android are very strongly encouraged to meet these requirements now so they will be able to upgrade to the future platform releases.

• [C-1-3] MUST be capable of transmitting and receiving data via the following peer-to-peer standards and protocols:

• ISO 18092
• LLCP 1.2 (defined by the NFC Forum)
• SDP 1.0 (defined by the NFC Forum)
• NDEF Push Protocol
• SNEP 1.0 (defined by the NFC Forum)
• [C-1-4] MUST include support for Android Beam and SHOULD enable Android Beam by default.
• [C-1-5] MUST be able to send and receive using Android Beam, when Android Beam is enabled or another proprietary NFC P2p mode is turned on.
• [C-1-6] MUST implement the SNEP default server. Valid NDEF messages received by the default SNEP server MUST be dispatched to applications using the android.nfc.ACTION_NDEF_DISCOVERED intent. Disabling Android Beam in settings MUST NOT disable dispatch of incoming NDEF message.
• [C-1-7] MUST honor the android.settings.NFCSHARING_SETTINGS intent to show NFC sharing settings .
• [C-1-8] MUST implement the NPP server. Messages received by the NPP server MUST be processed the same way as the SNEP default server.
• [C-1-9] MUST implement a SNEP client and attempt to send outbound P2P NDEF to the default SNEP server when Android Beam is enabled. If no default SNEP server is found then the client MUST attempt to send to an NPP server.
• [C-1-10] MUST allow foreground activities to set the outbound P2P NDEF message using android.nfc.NfcAdapter.setNdefPushMessage , and android.nfc.NfcAdapter.setNdefPushMessageCallback , and android.nfc.NfcAdapter.enableForegroundNdefPush .
• SHOULD use a gesture or on-screen confirmation, such as 'Touch to Beam', before sending outbound P2P NDEF messages.
• [C-1-11] MUST support NFC Connection handover to Bluetooth when the device supports Bluetooth Object Push Profile.
• [C-1-12] MUST support connection handover to Bluetooth when using android.nfc.NfcAdapter.setBeamPushUris , by implementing the “ Connection Handover version 1.2 ” and “ Bluetooth Secure Simple Pairing Using NFC version 1.0 ” specs from the NFC Forum. Such an implementation MUST implement the handover LLCP service with service name “urn:nfc:sn:handover” for exchanging the handover request/select records over NFC, and it MUST use the Bluetooth Object Push Profile for the actual Bluetooth data transfer. For legacy reasons (to remain compatible with Android 4.1 devices), the implementation SHOULD still accept SNEP GET requests for exchanging the handover request/select records over NFC. However an implementation itself SHOULD NOT send SNEP GET requests for performing connection handover.
• [C-1-13] MUST poll for all supported technologies while in NFC discovery mode.
• SHOULD be in NFC discovery mode while the device is awake with the screen active and the lock-screen unlocked.
• SHOULD be capable of reading the barcode and URL (if encoded) of Thinfilm NFC Barcode products.

(Note that publicly available links are not available for the JIS, ISO, and NFC Forum specifications cited above.)

Android includes support for NFC Host Card Emulation (HCE) mode.

If device implementations include an NFC controller chipset capable of HCE (for NfcA and/or NfcB) and support Application ID (AID) routing, they:

• [C-2-1] MUST report the android.hardware.nfc.hce feature constant.
• [C-2-2] MUST support NFC HCE APIs as defined in the Android SDK.

If device implementations include an NFC controller chipset capable of HCE for NfcF, and implement the feature for third-party applications, they:

• [C-3-1] MUST report the android.hardware.nfc.hcef feature constant.
• [C-3-2] MUST implement the NfcF Card Emulation APIs as defined in the Android SDK.

If device implementations include general NFC support as described in this section and support MIFARE technologies (MIFARE Classic, MIFARE Ultralight, NDEF on MIFARE Classic) in the reader/writer role, they:

• [C-4-1] MUST implement the corresponding Android APIs as documented by the Android SDK.
• [C-4-2] MUST report the feature com.nxp.mifare from the android.content.pm.PackageManager.hasSystemFeature () method. Note that this is not a standard Android feature and as such does not appear as a constant in the android.content.pm.PackageManager class.

7.4.5. Minimum Network Capability

پیاده سازی دستگاه:

• [C-0-1] MUST include support for one or more forms of data networking. Specifically, device implementations MUST include support for at least one data standard capable of 200Kbit/sec or greater. Examples of technologies that satisfy this requirement include EDGE, HSPA, EV-DO, 802.11g, Ethernet, Bluetooth PAN, etc.
• [C-0-2] MUST include an IPv6 networking stack and support IPv6 communication using the managed APIs, such as java.net.Socket and java.net.URLConnection , as well as the native APIs, such as AF_INET6 sockets.
• [C-0-3] MUST enable IPv6 by default.
• MUST ensure that IPv6 communication is as reliable as IPv4, for example.
• [C-0-4] MUST maintain IPv6 connectivity in doze mode.
• [C-0-5] Rate-limiting MUST NOT cause the device to lose IPv6 connectivity on any IPv6-compliant network that uses RA lifetimes of at least 180 seconds.
• SHOULD also include support for at least one common wireless data standard, such as 802.11 (Wi-Fi) when a physical networking standard (such as Ethernet) is the primary data connection
• MAY implement more than one form of data connectivity.

The required level of IPv6 support depends on the network type, as follows:

If devices implementations support Wi-Fi networks, they:

• [C-1-1] MUST support dual-stack and IPv6-only operation on Wi-Fi.

If device implementations support Ethernet networks, they:

• [C-2-1] MUST support dual-stack operation on Ethernet.

If device implementations support cellular data, they:

• [C-3-1] MUST simultaneously meet these requirements on each network to which it is connected when a device is simultaneously connected to more than one network (eg, Wi-Fi and cellular data), .
• SHOULD support IPv6 operation (IPv6-only and possibly dual-stack) on cellular data.

7.4.6. Sync Settings

پیاده سازی دستگاه:

• [C-0-1] MUST have the master auto-sync setting on by default so that the method getMasterSyncAutomatically() returns “true”.

7.4.7. Data Saver

If device implementations include a metered connection, they are:

• [SR] STRONGLY RECOMMENDED to provide the data saver mode.

If device implementations provide the data saver mode, they:

• [C-1-1] MUST support all the APIs in the ConnectivityManager class as described in the SDK documentation
• [C-1-2] MUST provide a user interface in the settings, that handles the Settings.ACTION_IGNORE_BACKGROUND_DATA_RESTRICTIONS_SETTINGS intent, allowing users to add applications to or remove applications from the allowlist.

If device implementations do not provide the data saver mode, they:

• [C-2-1] MUST return the value RESTRICT_BACKGROUND_STATUS_DISABLED for ConnectivityManager.getRestrictBackgroundStatus()
• [C-2-2] MUST NOT broadcast ConnectivityManager.ACTION_RESTRICT_BACKGROUND_CHANGED .
• [C-2-3] MUST have an activity that handles the Settings.ACTION_IGNORE_BACKGROUND_DATA_RESTRICTIONS_SETTINGS intent but MAY implement it as a no-op.

7.5. Cameras

If device implementations include at least one camera, they:

• [C-1-1] MUST declare the android.hardware.camera.any feature flag.
• [C-1-2] MUST be possible for an application to simultaneously allocate 3 RGBA_8888 bitmaps equal to the size of the images produced by the largest-resolution camera sensor on the device, while camera is open for the purpose of basic preview and still capture.

7.5.1. Rear-Facing Camera

A rear-facing camera is a camera located on the side of the device opposite the display; that is, it images scenes on the far side of the device, like a traditional camera.

پیاده سازی دستگاه:

• SHOULD include a rear-facing camera.

If device implementations include at least one rear-facing camera, they:

• [C-1-1] MUST report the feature flag android.hardware.camera and android.hardware.camera.any .
• [C-1-2] MUST have a resolution of at least 2 megapixels.
• SHOULD have either hardware auto-focus or software auto-focus implemented in the camera driver (transparent to application software).
• MAY have fixed-focus or EDOF (extended depth of field) hardware.
• MAY include a flash.

If the Camera includes a flash:

• [C-2-1] the flash lamp MUST NOT be lit while an android.hardware.Camera.PreviewCallback instance has been registered on a Camera preview surface, unless the application has explicitly enabled the flash by enabling the FLASH_MODE_AUTO or FLASH_MODE_ON attributes of a Camera.Parameters object. Note that this constraint does not apply to the device's built-in system camera application, but only to third-party applications using Camera.PreviewCallback .

7.5.2. Front-Facing Camera

A front-facing camera is a camera located on the same side of the device as the display; that is, a camera typically used to image the user, such as for video conferencing and similar applications.

پیاده سازی دستگاه:

• MAY include a front-facing camera

If device implementations include at least one front-facing camera, they:

• [C-1-1] MUST report the feature flag android.hardware.camera.any and android.hardware.camera.front .
• [C-1-2] MUST have a resolution of at least VGA (640x480 pixels).
• [C-1-3] MUST NOT use a front-facing camera as the default for the Camera API and MUST NOT configure the API to treat a front-facing camera as the default rear-facing camera, even if it is the only camera on the device.
• [C-1-5] The camera preview MUST be mirrored horizontally relative to the orientation specified by the application when the current application has explicitly requested that the Camera display be rotated via a call to the android.hardware.Camera.setDisplayOrientation() method. Conversely, the preview MUST be mirrored along the device's default horizontal axis when the the current application does not explicitly request that the Camera display be rotated via a call to the android.hardware.Camera.setDisplayOrientation() method.
• [C-1-6] MUST NOT mirror the final captured still image or video streams returned to application callbacks or committed to media storage.
• [C-1-7] MUST mirror the image displayed by the postview in the same manner as the camera preview image stream.
• MAY include features (such as auto-focus, flash, etc.) available to rear-facing cameras as described in section 7.5.1 .

If device implementations are capable of being rotated by user (such as automatically via an accelerometer or manually via user input):

• [C-2-1] The camera preview MUST be mirrored horizontally relative to the device's current orientation.

7.5.3. External Camera

پیاده سازی دستگاه:

• MAY include support for an external camera that is not necessarily always connected.

If device implementations include support for an external camera, they:

• [C-1-1] MUST declare the platform feature flag android.hardware.camera.external and android.hardware camera.any .
• [C-1-2] MUST support USB Video Class (UVC 1.0 or higher) if the external camera connects through the USB port.
• SHOULD support video compressions such as MJPEG to enable transfer of high-quality unencoded streams (ie raw or independently compressed picture streams).
• MAY support multiple cameras.
• MAY support camera-based video encoding. If supported, a simultaneous unencoded / MJPEG stream (QVGA or greater resolution) MUST be accessible to the device implementation.

7.5.4. Camera API Behavior

Android includes two API packages to access the camera, the newer android.hardware.camera2 API expose lower-level camera control to the app, including efficient zero-copy burst/streaming flows and per-frame controls of exposure, gain, white balance gains, color conversion, denoising, sharpening, and more.

The older API package, android.hardware.Camera , is marked as deprecated in Android 5.0 but as it should still be available for apps to use. Android device implementations MUST ensure the continued support of the API as described in this section and in the Android SDK.

Device implementations MUST implement the following behaviors for the camera-related APIs, for all available cameras. پیاده سازی دستگاه:

• [C-0-1] MUST use android.hardware.PixelFormat.YCbCr_420_SP for preview data provided to application callbacks when an application has never called android.hardware.Camera.Parameters.setPreviewFormat(int) .
• [C-0-2] MUST further be in the NV21 encoding format when an application registers an android.hardware.Camera.PreviewCallback instance and the system calls the onPreviewFrame() method and the preview format is YCbCr_420_SP, the data in the byte[] passed into onPreviewFrame() . That is, NV21 MUST be the default.
• [C-0-3] MUST support the YV12 format (as denoted by the android.graphics.ImageFormat.YV12 constant) for camera previews for both front- and rear-facing cameras for android.hardware.Camera . (The hardware video encoder and camera may use any native pixel format, but the device implementation MUST support conversion to YV12.)
• [C-0-4] MUST support the android.hardware.ImageFormat.YUV_420_888 and android.hardware.ImageFormat.JPEG formats as outputs through the android.media.ImageReader API for android.hardware.camera2 devices that advertise REQUEST_AVAILABLE_CAPABILITIES_BACKWARD_COMPATIBLE capability in android.request.availableCapabilities .
• [C-0-5] MUST still implement the full Camera API included in the Android SDK documentation, regardless of whether the device includes hardware autofocus or other capabilities. For instance, cameras that lack autofocus MUST still call any registered android.hardware.Camera.AutoFocusCallback instances (even though this has no relevance to a non-autofocus camera.) Note that this does apply to front-facing cameras; for instance, even though most front-facing cameras do not support autofocus, the API callbacks must still be “faked” as described.
• [C-0-6] MUST recognize and honor each parameter name defined as a constant on the android.hardware.Camera.Parameters class. Conversely, device implementations MUST NOT honor or recognize string constants passed to the android.hardware.Camera.setParameters() method other than those documented as constants on the android.hardware.Camera.Parameters . That is, device implementations MUST support all standard Camera parameters if the hardware allows, and MUST NOT support custom Camera parameter types. For instance, device implementations that support image capture using high dynamic range (HDR) imaging techniques MUST support camera parameter Camera.SCENE_MODE_HDR .
• [C-0-7] MUST report the proper level of support with the android.info.supportedHardwareLevel property as described in the Android SDK and report the appropriate framework feature flags .
• [C-0-8] MUST also declare its individual camera capabilities of android.hardware.camera2 via the android.request.availableCapabilities property and declare the appropriate feature flags ; MUST define the feature flag if any of its attached camera devices supports the feature.
• [C-0-9] MUST broadcast the Camera.ACTION_NEW_PICTURE intent whenever a new picture is taken by the camera and the entry of the picture has been added to the media store.
• [C-0-10] MUST broadcast the Camera.ACTION_NEW_VIDEO intent whenever a new video is recorded by the camera and the entry of the picture has been added to the media store.

7.5.5. Camera Orientation

If device implementations have a front- or a rear-facing camera, such camera(s):

• [C-1-1] MUST be oriented so that the long dimension of the camera aligns with the screen's long dimension. That is, when the device is held in the landscape orientation, cameras MUST capture images in the landscape orientation. This applies regardless of the device's natural orientation; that is, it applies to landscape-primary devices as well as portrait-primary devices.

7.6. Memory and Storage

7.6.1. Minimum Memory and Storage

پیاده سازی دستگاه:

• [C-0-1] MUST include a Download Manager that applications MAY use to download data files and they MUST be capable of downloading individual files of at least 100MB in size to the default “cache” location.

7.6.2. Application Shared Storage

پیاده سازی دستگاه:

• [C-0-1] MUST offer storage to be shared by applications, also often referred as “shared external storage”, "application shared storage" or by the Linux path "/sdcard" it is mounted on.
• [C-0-2] MUST be configured with shared storage mounted by default, in other words “out of the box”, regardless of whether the storage is implemented on an internal storage component or a removable storage medium (eg Secure Digital card slot).
• [C-0-3] MUST mount the application shared storage directly on the Linux path sdcard or include a Linux symbolic link from sdcard to the actual mount point.
• [C-0-4] MUST enforce the android.permission.WRITE_EXTERNAL_STORAGE permission on this shared storage as documented in the SDK. Shared storage MUST otherwise be writable by any application that obtains that permission.

Device implementations MAY meet the above requirements using either:

• a user-accessible removable storage, such as a Secure Digital (SD) card slot.
• a portion of the internal (non-removable) storage as implemented in the Android Open Source Project (AOSP).

If device implementations use removable storage to satisfy the above requirements, they:

• [C-1-1] MUST implement a toast or pop-up user interface warning the user when there is no storage medium inserted in the slot.
• [C-1-2] MUST include a FAT-formatted storage medium (eg SD card) or show on the box and other material available at time of purchase that the storage medium has to be purchased separately.

If device implementations use a protion of the non-removable storage to satisfy the above requirements, they:

• SHOULD use the AOSP implementation of the internal application shared storage.
• MAY share the storage space with the application private data.

If device implementations include multiple shared storage paths (such as both an SD card slot and shared internal storage), they:

• [C-3-1] MUST allow only pre-installed and privileged Android applications with the WRITE_EXTERNAL_STORAGE permission to write to the secondary external storage, except when writing to their package-specific directories or within the URI returned by firing the ACTION_OPEN_DOCUMENT_TREE intent.

If device implementations have a USB port with USB peripheral mode support, they:

• [C-3-1] MUST provide a mechanism to access the data on the application shared storage from a host computer.
• SHOULD expose content from both storage paths transparently through Android's media scanner service and android.provider.MediaStore .
• MAY use USB mass storage, but SHOULD use Media Transfer Protocol to satisfy this requirement.

If device implementations have a USB port with USB peripheral mode and support Media Transfer Protocol, they:

• SHOULD be compatible with the reference Android MTP host, Android File Transfer .
• SHOULD report a USB device class of 0x00.
• SHOULD report a USB interface name of 'MTP'.

7.6.3. Adoptable Storage

If the device is expected to be mobile in nature unlike Television, device implementations are:

• [SR] STRONGLY RECOMMENDED to implement the adoptable storage in a long-term stable location, since accidentally disconnecting them can cause data loss/corruption.

If the removable storage device port is in a long-term stable location, such as within the battery compartment or other protective cover, device implementations are:

• [SR] STRONGLY RECOMMENDED to implement adoptable storage .

7.7. USB

If device implementations have a USB port, they:

• SHOULD support USB peripheral mode and SHOULD support USB host mode.

7.7.1. USB peripheral mode

If device implementations include a USB port supporting peripheral mode:

• [C-1-1] The port MUST be connectable to a USB host that has a standard type-A or type-C USB port.
• [C-1-2] MUST report the correct value of iSerialNumber in USB standard device descriptor through android.os.Build.SERIAL .
• [C-1-3] MUST detect 1.5A and 3.0A chargers per the Type-C resistor standard and MUST detect changes in the advertisement if they support Type-C USB.
• [SR] The port SHOULD use micro-B, micro-AB or Type-C USB form factor. Existing and new Android devices are STRONGLY RECOMMENDED to meet these requirements so they will be able to upgrade to the future platform releases.
• [SR] The port SHOULD be located on the bottom of the device (according to natural orientation) or enable software screen rotation for all apps (including home screen), so that the display draws correctly when the device is oriented with the port at bottom. Existing and new Android devices are STRONGLY RECOMMENDED to meet these requirements so they will be able to upgrade to future platform releases.
• [SR] SHOULD implement support to draw 1.5 A current during HS chirp and traffic as specified in the USB Battery Charging specification, revision 1.2 . Existing and new Android devices are STRONGLY RECOMMENDED to meet these requirements so they will be able to upgrade to the future platform releases.
• [SR] STRONGLY RECOMMENDED to not support proprietary charging methods that modify Vbus voltage beyond default levels, or alter sink/source roles as such may result in interoperability issues with the chargers or devices that support the standard USB Power Delivery methods. While this is called out as "STRONGLY RECOMMENDED", in future Android versions we might REQUIRE all type-C devices to support full interoperability with standard type-C chargers.
• [SR] STRONGLY RECOMMENDED to support Power Delivery for data and power role swapping when they support Type-C USB and USB host mode.
• SHOULD support Power Delivery for high-voltage charging and support for Alternate Modes such as display out.
• SHOULD implement the Android Open Accessory (AOA) API and specification as documented in the Android SDK documentation.

If device implementations including a USB port, implement the AOA specification, they:

• [C-2-1] MUST declare support for the hardware feature android.hardware.usb.accessory .
• [C-2-2] The USB mass storage class MUST include the string "android" at the end of the interface description iInterface string of the USB mass storage
• SHOULD NOT implement AOAv2 audio documented in the Android Open Accessory Protocol 2.0 documentation. AOAv2 audio is deprecated as of Android version 8.0 (API level 26).

7.7.2. USB host mode

If device implementations include a USB port supporting host mode, they:

• [C-1-1] MUST implement the Android USB host API as documented in the Android SDK and MUST declare support for the hardware feature android.hardware.usb.host .
• [C-1-2] MUST implement support to connect standard USB peripherals, in other words, they MUST either:
  • Have an on-device type C port or ship with cable(s) adapting an on-device proprietary port to a standard USB type-C port (USB Type-C device).
  • Have an on-device type A or ship with cable(s) adapting an on-device proprietary port to a standard USB type-A port.
  • Have an on-device micro-AB port, which SHOULD ship with a cable adapting to a standard type-A port.
• [C-1-3] MUST NOT ship with an adapter converting from USB type A or micro-AB ports to a type-C port (receptacle).
• [SR] STRONGLY RECOMMENDED to implement the USB audio class as documented in the Android SDK documentation.
• SHOULD support charging the connected USB peripheral device while in host mode; advertising a source current of at least 1.5A as specified in the Termination Parameters section of the USB Type-C Cable and Connector Specification Revision 1.2 for USB Type-C connectors or using Charging Downstream Port(CDP) output current range as specified in the USB Battery Charging specifications, revision 1.2 for Micro-AB connectors.
• SHOULD implement and support USB Type-C standards.

If device implementations include a USB port supporting host mode and the USB audio class, they:

• [C-2-1] MUST support the USB HID class
• [C-2-2] MUST support the detection and mapping of the following HID data fields specified in the USB HID Usage Tables and the Voice Command Usage Request to the KeyEvent constants as below:
  • Usage Page (0xC) Usage ID (0x0CD): KEYCODE_MEDIA_PLAY_PAUSE
  • Usage Page (0xC) Usage ID (0x0E9): KEYCODE_VOLUME_UP
  • Usage Page (0xC) Usage ID (0x0EA): KEYCODE_VOLUME_DOWN
  • Usage Page (0xC) Usage ID (0x0CF): KEYCODE_VOICE_ASSIST

If device implementations include a USB port supporting host mode and the Storage Access Framework (SAF), they:

• [C-3-1] MUST recognize any remotely connected MTP (Media Transfer Protocol) devices and make their contents accessible through the ACTION_GET_CONTENT , ACTION_OPEN_DOCUMENT , and ACTION_CREATE_DOCUMENT intents. .

If device implementations include a USB port supporting host mode and USB Type-C, they:

• [C-4-1] MUST implement Dual Role Port functionality as defined by the USB Type-C specification (section 4.5.1.3.3).
• [SR] STRONGLY RECOMMENDED to support DisplayPort, SHOULD support USB SuperSpeed Data Rates, and are STRONGLY RECOMMENDED to support Power Delivery for data and power role swapping.
• [SR] STRONGLY RECOMMENDED to NOT support Audio Adapter Accessory Mode as described in the Appendix A of the USB Type-C Cable and Connector Specification Revision 1.2 .
• SHOULD implement the Try.* model that is most appropriate for the device form factor. For example a handheld device SHOULD implement the Try.SNK model.

7.8. Audio

7.8.1. Microphone

If device implementations include a microphone, they:

• [C-1-1] MUST report the android.hardware.microphone feature constant.
• [C-1-2] MUST meet the audio recording requirements in section 5.4 .
• [C-1-3] MUST meet the audio latency requirements in section 5.6 .
• [SR] STRONGLY RECOMMENDED to support near-ultrasound recording as described in section 7.8.3 .

If device implementations omit a microphone, they:

• [C-2-1] MUST NOT report the android.hardware.microphone feature constant.
• [C-2-2] MUST implement the audio recording API at least as no-ops, per section 7 .

7.8.2. Audio Output

If device implementations include a speaker or an audio/multimedia output port for an audio output peripheral such as a 4 conductor 3.5mm audio jack or USB host mode port using USB audio class , they:

• [C-1-1] MUST report the android.hardware.audio.output feature constant.
• [C-1-2] MUST meet the audio playback requirements in section 5.5 .
• [C-1-3] MUST meet the audio latency requirements in section 5.6 .
• [SR] STRONGLY RECOMMENDED to support near-ultrasound playback as described in section 7.8.3 .

If device implementations do not include a speaker or audio output port, they:

• [C-2-1] MUST NOT report the android.hardware.audio.output feature.
• [C-2-2] MUST implement the Audio Output related APIs as no-ops at least.

For the purposes of this section, an "output port" is a physical interface such as a 3.5mm audio jack, HDMI, or USB host mode port with USB audio class. Support for audio output over radio-based protocols such as Bluetooth, WiFi, or cellular network does not qualify as including an "output port".

7.8.2.1. Analog Audio Ports

In order to be compatible with the headsets and other audio accessories using the 3.5mm audio plug across the Android ecosystem, if a device implementation includes one or more analog audio ports, at least one of the audio port(s) SHOULD be a 4 conductor 3.5mm audio jack.

If device implementations have a 4 conductor 3.5mm audio jack, they:

• [C-1-1] MUST support audio playback to stereo headphones and stereo headsets with a microphone.
• [C-1-2] MUST support TRRS audio plugs with the CTIA pin-out order.
• [C-1-3] MUST support the detection and mapping to the keycodes for the following 3 ranges of equivalent impedance between the microphone and ground conductors on the audio plug:
  • 70 ohm or less : KEYCODE_HEADSETHOOK
  • 210-290 ohm : KEYCODE_VOLUME_UP
  • 360-680 ohm : KEYCODE_VOLUME_DOWN
• [C-1-4] MUST trigger ACTION_HEADSET_PLUG upon a plug insert, but only after all contacts on plug are touching their relevant segments on the jack.
• [C-1-5] MUST be capable of driving at least 150mV ± 10% of output voltage on a 32 ohm speaker impedance.
• [C-1-6] MUST have a microphone bias voltage between 1.8V ~ 2.9V.
• [SR] STRONGLY RECOMMENDED to detect and map to the keycode for the following range of equivalent impedance between the microphone and ground conductors on the audio plug:
  • 110-180 ohm: KEYCODE_VOICE_ASSIST
• SHOULD support audio plugs with the OMTP pin-out order.
• SHOULD support audio recording from stereo headsets with a microphone.

If device implementations have a 4 conductor 3.5mm audio jack and support a microphone, and broadcast the android.intent.action.HEADSET_PLUG with the extra value microphone set as 1, they:

• [C-2-1] MUST support the detection of microphone on the plugged in audio accessory.

7.8.3. Near-Ultrasound

Near-Ultrasound audio is the 18.5 kHz to 20 kHz band.

پیاده سازی دستگاه:

• MUST correctly report the support of near-ultrasound audio capability via the AudioManager.getProperty API as follows:

If PROPERTY_SUPPORT_MIC_NEAR_ULTRASOUND is "true", the following requirements MUST be met by the VOICE_RECOGNITION and UNPROCESSED audio sources:

• [C-1-1] The microphone's mean power response in the 18.5 kHz to 20 kHz band MUST be no more than 15 dB below the response at 2 kHz.
• [C-1-2] The microphone's unweighted signal to noise ratio over 18.5 kHz to 20 kHz for a 19 kHz tone at -26 dBFS MUST be no lower than 50 dB.

If PROPERTY_SUPPORT_SPEAKER_NEAR_ULTRASOUND is "true":

• [C-2-1] The speaker's mean response in 18.5 kHz - 20 kHz MUST be no lower than 40 dB below the response at 2 kHz.

7.9. Virtual Reality

Android includes APIs and facilities to build "Virtual Reality" (VR) applications including high quality mobile VR experiences. Device implementations MUST properly implement these APIs and behaviors, as detailed in this section.

7.9.1. Virtual Reality Mode

Android includes support for VR Mode , a feature which handles stereoscopic rendering of notifications and disables monocular system UI components while a VR application has user focus.

7.9.2. Virtual Reality High Performance

If device implementations identify the support of high performance VR for longer user periods through the android.hardware.vr.high_performance feature flag, they:

• [C-1-1] MUST have at least 2 physical cores.
• [C-1-2] MUST declare android.software.vr.mode feature .
• [C-1-3] MUST support sustained performance mode.
• [C-1-4] MUST support OpenGL ES 3.2.
• [C-1-5] MUST support Vulkan Hardware Level 0 and SHOULD support Vulkan Hardware Level 1.
• [C-1-6] MUST implement EGL_KHR_mutable_render_buffer , EGL_ANDROID_front_buffer_auto_refresh , EGL_ANDROID_get_native_client_buffer , EGL_KHR_fence_sync , EGL_KHR_wait_sync , EGL_IMG_context_priority , EGL_EXT_protected_content , and expose the extensions in the list of available EGL extensions.
• [C-1-7] The GPU and display MUST be able to synchronize access to the shared front buffer such that alternating-eye rendering of VR content at 60fps with two render contexts will be displayed with no visible tearing artifacts.
• [C-1-8] MUST implement GL_EXT_multisampled_render_to_texture , GL_OVR_multiview , GL_OVR_multiview2 , GL_OVR_multiview_multisampled_render_to_texture , GL_EXT_protected_textures , GL_EXT_EGL_image_array , GL_EXT_external_buffer , and expose the extensions in the list of available GL extensions.
• [C-1-9] MUST implement support for AHardwareBuffer flags AHARDWAREBUFFER_USAGE_GPU_DATA_BUFFER and AHARDWAREBUFFER_USAGE_SENSOR_DIRECT_DATA as described in the NDK.
• [C-1-10] MUST implement support for AHardwareBuffers with more than one layer.
• [C-1-11] MUST support H.264 decoding at least 3840x2160@30fps-40Mbps (equivalent to 4 instances of 1920x1080@30fps-10Mbps or 2 instances of 1920x1080@60fps-20Mbps).
• [C-1-12] MUST support HEVC and VP9, MUST be capable to decode at least 1920x1080@30fps-10Mbps and SHOULD be capable to decode 3840x2160@30fps-20Mbps (equivalent to 4 instances of 1920x1080@30fps-5Mbps).
• [C-1-13] MUST support HardwarePropertiesManager.getDeviceTemperatures API and return accurate values for skin temperature.
• [C-1-14] MUST have an embedded screen, and its resolution MUST be at least be FullHD(1080p) and STRONGLY RECOMMENDED TO BE be QuadHD (1440p) or higher.
• [C-1-15] The display MUST update at least 60 Hz while in VR Mode.
• [C-1-16] The display latency (as measured on Gray-to-Gray, White-to-Black, and Black-to-White switching time) MUST be ≤ 6 milliseconds.
• [C-1-17] The display MUST support a low-persistence mode with ≤ 5 milliseconds persistence, persistence being defined as the amount of time for which a pixel is emitting light.
• [C-1-18] MUST support Bluetooth 4.2 and Bluetooth LE Data Length Extension section 7.4.3 .
• [C-1-19] MUST support and properly report Direct Channel Type for all of the following default sensor types:
  • TYPE_ACCELEROMETER
  • TYPE_ACCELEROMETER_UNCALIBRATED
  • TYPE_GYROSCOPE
  • TYPE_GYROSCOPE_UNCALIBRATED
  • TYPE_MAGNETIC_FIELD
  • TYPE_MAGNETIC_FIELD_UNCALIBRATED
• [C-1-20] MUST support the TYPE_HARDWARE_BUFFER direct channel type for all Direct Channel Types listed above.
• [SR] Are STRONGLY RECOMMENDED to support android.hardware.sensor.hifi_sensors feature and MUST meet the gyroscope, accelerometer, and magnetometer related requirements for android.hardware.hifi_sensors .
• MAY provide an exclusive core to the foreground application and MAY support the Process.getExclusiveCores API to return the numbers of the cpu cores that are exclusive to the top foreground application. If exclusive core is supported then the core MUST not allow any other userspace processes to run on it (except device drivers used by the application), but MAY allow some kernel processes to run as necessary.

8. Performance and Power

Some minimum performance and power criteria are critical to the user experience and impact the baseline assumptions developers would have when developing an app.

8.1. User Experience Consistency

A smooth user interface can be provided to the end user if there are certain minimum requirements to ensure a consistent frame rate and response times for applications and games. Device implementations, depending on the device type, MAY have measurable requirements for the user interface latency and task switching as described in section 2 .

8.2. File I/O Access Performance

Providing a common baseline for a consistent file access performance on the application private data storage ( /data partition) allows app developers to set a proper expectation that would help their software design. Device implementations, depending on the device type, MAY have certain requirements described in section 2 for the following read and write operations:

• Sequential write performance . Measured by writing a 256MB file using 10MB write buffer.
• Random write performance . Measured by writing a 256MB file using 4KB write buffer.
• Sequential read performance . Measured by reading a 256MB file using 10MB write buffer.
• Random read performance . Measured by reading a 256MB file using 4KB write buffer.

8.3. Power-Saving Modes

Android includes App Standby and Doze power-saving modes to optimize battery usage. [SR] All Apps exempted from these modes are STRONGLY RECOMMENDED to be made visible to the end user. [SR] The triggering, maintenance, wakeup algorithms and the use of global system settings of these power-saving modes are STRONGLY RECOMMENDED NOT to deviate from the Android Open Source Project.

In addition to the power-saving modes, Android device implementations MAY implement any or all of the 4 sleeping power states as defined by the Advanced Configuration and Power Interface (ACPI).

If device implementations implements S3 and S4 power states as defined by the ACPI, they:

• [C-1-1] MUST only enter these states when closing a lid that is physically part of the device.

8.4. Power Consumption Accounting

A more accurate accounting and reporting of the power consumption provides the app developer both the incentives and the tools to optimize the power usage pattern of the application.

پیاده سازی دستگاه:

• [SR] STRONGLY RECOMMENDED to provide a per-component power profile that defines the current consumption value for each hardware component and the approximate battery drain caused by the components over time as documented in the Android Open Source Project site.
• [SR] STRONGLY RECOMMENDED to report all power consumption values in milliampere hours (mAh).
• [SR] STRONGLY RECOMMENDED to report CPU power consumption per each process's UID. پروژه منبع باز Android از طریق اجرای ماژول هسته uid_cputime این نیاز را برآورده می کند.
• [SR] STRONGLY RECOMMENDED to make this power usage available via the adb shell dumpsys batterystats shell command to the app developer.
• SHOULD be attributed to the hardware component itself if unable to attribute hardware component power usage to an application.

8.5. Consistent Performance

Performance can fluctuate dramatically for high-performance long-running apps, either because of the other apps running in the background or the CPU throttling due to temperature limits. Android includes programmatic interfaces so that when the device is capable, the top foreground application can request that the system optimize the allocation of the resources to address such fluctuations.

پیاده سازی دستگاه:

• [C-0-1] MUST report the support of Sustained Performance Mode accurately through the PowerManager.isSustainedPerformanceModeSupported() API method.

• SHOULD support Sustained Performance Mode.

If device implementations report support of Sustained Performance Mode, they:

• [C-1-1] MUST provide the top foreground application a consistent level of performance for at least 30 minutes, when the app requests it.
• [C-1-2] MUST honor the Window.setSustainedPerformanceMode() API and other related APIs.

If device implementations include two or more CPU cores, they:

• SHOULD provide at least one exclusive core that can be reserved by the top foreground application.

If device implementations support reserving one exclusive core for the top foreground application, they:

• [C-2-1] MUST report through the Process.getExclusiveCores() API method the ID numbers of the exclusive cores that can be reserved by the top foreground application.
• [C-2-2] MUST not allow any user space processes except the device drivers used by the application to run on the exclusive cores, but MAY allow some kernel processes to run as necessary.

If device implementations do not support an exclusive core, they:

• [C-3-1] MUST return an empty list through the Process.getExclusiveCores() API method.

9. Security Model Compatibility

پیاده سازی دستگاه:

• [C-0-1] MUST implement a security model consistent with the Android platform security model as defined in Security and Permissions reference document in the APIs in the Android developer documentation.

• [C-0-2] MUST support installation of self-signed applications without requiring any additional permissions/certificates from any third parties/authorities. Specifically, compatible devices MUST support the security mechanisms described in the follow subsections.

9.1. مجوزها

پیاده سازی دستگاه:

• [C-0-1] MUST support the Android permissions model as defined in the Android developer documentation. Specifically, they MUST enforce each permission defined as described in the SDK documentation; no permissions may be omitted, altered, or ignored.

• MAY add additional permissions, provided the new permission ID strings are not in the android.\* namespace.

• [C-0-2] Permissions with a protectionLevel of PROTECTION_FLAG_PRIVILEGED MUST only be granted to apps preloaded in the privileged path(s) of the system image and within the subset of the explicitly allowlisted permissions for each app. The AOSP implementation meets this requirement by reading and honoring the allowlisted permissions for each app from the files in the etc/permissions/ path and using the system/priv-app path as the privileged path.

Permissions with a protection level of dangerous are runtime permissions. Applications with targetSdkVersion > 22 request them at runtime.

پیاده سازی دستگاه:

• [C-0-3] MUST show a dedicated interface for the user to decide whether to grant the requested runtime permissions and also provide an interface for the user to manage runtime permissions.
• [C-0-4] MUST have one and only one implementation of both user interfaces.
• [C-0-5] MUST NOT grant any runtime permissions to preinstalled apps unless:
• the user's consent can be obtained before the application uses it
• the runtime permissions are associated with an intent pattern for which the preinstalled application is set as the default handler

If device implementations include a pre-installed app or wish to allow third-party apps to access the usage statistics, they:

• [C-1-1] are STRONGLY RECOMMENDED provide user-accessible mechanism to grant or revoke access to the usage stats in response to the android.settings.ACTION_USAGE_ACCESS_SETTINGS intent for apps that declare the android.permission.PACKAGE_USAGE_STATS permission.

If device implementations intend to disallow any apps, including pre-installed apps, from accessing the usage statistics, they:

• [C-2-1] MUST still have an activity that handles the android.settings.ACTION_USAGE_ACCESS_SETTINGS intent pattern but MUST implement it as a no-op, that is to have an equivalent behavior as when the user is declined for access.

9.2. UID and Process Isolation

پیاده سازی دستگاه:

• [C-0-1] MUST support the Android application sandbox model, in which each application runs as a unique Unixstyle UID and in a separate process.
• [C-0-2] MUST support running multiple applications as the same Linux user ID, provided that the applications are properly signed and constructed, as defined in the Security and Permissions reference .

9.3. Filesystem Permissions

پیاده سازی دستگاه:

• [C-0-1] MUST support the Android file access permissions model as defined in the Security and Permissions reference .

9.4. Alternate Execution Environments

Device implementations MUST keep consistency of the Android security and permission model, even if they include runtime environments that execute applications using some other software or technology than the Dalvik Executable Format or native code. In other words:

• [C-0-1] Alternate runtimes MUST themselves be Android applications, and abide by the standard Android security model, as described elsewhere in section 9 .

• [C-0-2] Alternate runtimes MUST NOT be granted access to resources protected by permissions not requested in the runtime's AndroidManifest.xml file via the < uses-permission > mechanism.

• [C-0-3] Alternate runtimes MUST NOT permit applications to make use of features protected by Android permissions restricted to system applications.

• [C-0-4] Alternate runtimes MUST abide by the Android sandbox model and installed applications using an alternate runtime MUST NOT reuse the sandbox of any other app installed on the device, except through the standard Android mechanisms of shared user ID and signing certificate.

• [C-0-5] Alternate runtimes MUST NOT launch with, grant, or be granted access to the sandboxes corresponding to other Android applications.

• [C-0-6] Alternate runtimes MUST NOT be launched with, be granted, or grant to other applications any privileges of the superuser (root), or of any other user ID.

• [C-0-7] When the .apk files of alternate runtimes are included in the system image of device implementations, it MUST be signed with a key distinct from the key used to sign other applications included with the device implementations.

• [C-0-8] When installing applications, alternate runtimes MUST obtain user consent for the Android permissions used by the application.

• [C-0-9] When an application needs to make use of a device resource for which there is a corresponding Android permission (such as Camera, GPS, etc.), the alternate runtime MUST inform the user that the application will be able to access that resource.

• [C-0-10] When the runtime environment does not record application capabilities in this manner, the runtime environment MUST list all permissions held by the runtime itself when installing any application using that runtime.

• Alternate runtimes SHOULD install apps via the PackageManager into separate Android sandboxes (Linux user IDs, etc.).

• Alternate runtimes MAY provide a single Android sandbox shared by all applications using the alternate runtime.

9.5. Multi-User Support

Android includes support for multiple users and provides support for full user isolation.

• Device implementations MAY but SHOULD NOT enable multi-user if they use removable media for primary external storage.

If device implementations include multiple users, they:

• [C-1-1] MUST meet the following requirements related to multi-user support .
• [C-1-2] MUST, for each user, implement a security model consistent with the Android platform security model as defined in Security and Permissions reference document in the APIs.
• [C-1-3] MUST have separate and isolated shared application storage (aka /sdcard ) directories for each user instance.
• [C-1-4] MUST ensure that applications owned by and running on behalf a given user cannot list, read, or write to the files owned by any other user, even if the data of both users are stored on the same volume or filesystem.
• [C-1-5] MUST encrypt the contents of the SD card when multiuser is enabled using a key stored only on non-removable media accessible only to the system if device implementations use removable media for the external storage APIs. As this will make the media unreadable by a host PC, device implementations will be required to switch to MTP or a similar system to provide host PCs with access to the current user's data.

If device implementations include multiple users and do not declare the android.hardware.telephony feature flag, they:

• [C-2-1] MUST support restricted profiles, a feature that allows device owners to manage additional users and their capabilities on the device. With restricted profiles, device owners can quickly set up separate environments for additional users to work in, with the ability to manage finer-grained restrictions in the apps that are available in those environments.

If device implementations include multiple users and declare the android.hardware.telephony feature flag, they:

• [C-3-1] MUST NOT support restricted profiles but MUST align with the AOSP implementation of controls to enable /disable other users from accessing the voice calls and SMS.

9.6. Premium SMS Warning

Android includes support for warning users of any outgoing premium SMS message . Premium SMS messages are text messages sent to a service registered with a carrier that may incur a charge to the user.

If device implementations declare support for android.hardware.telephony , they:

• [C-1-1] MUST warn users before sending a SMS message to numbers identified by regular expressions defined in /data/misc/sms/codes.xml file in the device. The upstream Android Open Source Project provides an implementation that satisfies this requirement.

9.7. Kernel Security Features

The Android Sandbox includes features that use the Security-Enhanced Linux (SELinux) mandatory access control (MAC) system, seccomp sandboxing, and other security features in the Linux kernel. پیاده سازی دستگاه:

• [C-0-1] MUST maintain compatibility with existing applications, even when SELinux or any other security features are implemented below the Android framework.
• [C-0-2] MUST NOT have a visible user interface when a security violation is detected and successfully blocked by the security feature implemented below the Android framework, but MAY have a visible user interface when an unblocked security violation occurs resulting in a successful exploit.
• [C-0-3] MUST NOT make SELinux or any other security features implemented below the Android framework configurable to the user or app developer.
• [C-0-4] MUST NOT allow an application that can affect another application through an API (such as a Device Administration API) to configure a policy that breaks compatibility.
• [C-0-5] MUST split the media framework into multiple processes so that it is possible to more narrowly grant access for each process as described in the Android Open Source Project site.
• [C-0-6] MUST implement a kernel application sandboxing mechanism which allows filtering of system calls using a configurable policy from multithreaded programs. The upstream Android Open Source Project meets this requirement through enabling the seccomp-BPF with threadgroup synchronization (TSYNC) as described in the Kernel Configuration section of source.android.com .

Kernel integrity and self-protection features are integral to Android security. پیاده سازی دستگاه:

• [C-0-7] MUST implement kernel stack buffer overflow protections (eg CONFIG_CC_STACKPROTECTOR_STRONG ).
• [C-0-8] MUST implement strict kernel memory protections where executable code is read-only, read-only data is non-executable and non-writable, and writable data is non-executable (eg CONFIG_DEBUG_RODATA or CONFIG_STRICT_KERNEL_RWX ).
• [SR] STRONGLY RECOMMENDED to keep kernel data which is written only during initialization marked read-only after initialization (eg __ro_after_init ).
• [SR} STRONGLY RECOMMENDED to implement static and dynamic object size bounds checking of copies between user-space and kernel-space (eg CONFIG_HARDENED_USERCOPY ).
• [SR] STRONGLY RECOMMENDED to never execute user-space memory when running in the kernel (eg hardware PXN, or emulated via CONFIG_CPU_SW_DOMAIN_PAN or CONFIG_ARM64_SW_TTBR0_PAN ).
• [SR] STRONGLY RECOMMENDED to never read or write user-space memory in the kernel outside of normal usercopy access APIs (eg hardware PAN, or emulated via CONFIG_CPU_SW_DOMAIN_PAN or CONFIG_ARM64_SW_TTBR0_PAN ).
• [SR] STRONGLY RECOMMENDED to randomize the layout of the kernel code and memory, and to avoid exposures that would compromise the randomization (eg CONFIG_RANDOMIZE_BASE with bootloader entropy via the /chosen/kaslr-seed Device Tree node or EFI_RNG_PROTOCOL ).

If device implementations use a Linux kernel, they:

• [C-1-1] MUST implement SELinux.
• [C-1-2] MUST set SELinux to global enforcing mode.
• [C-1-3] MUST configure all domains in enforcing mode. No permissive mode domains are allowed, including domains specific to a device/vendor.
• [C-1-4] MUST NOT modify, omit, or replace the neverallow rules present within the system/sepolicy folder provided in the upstream Android Open Source Project (AOSP) and the policy MUST compile with all neverallow rules present, for both AOSP SELinux domains as well as device/vendor specific domains.
• SHOULD retain the default SELinux policy provided in the system/sepolicy folder of the upstream Android Open Source Project and only further add to this policy for their own device-specific configuration.

If device implementations use kernel other than Linux, they:

• [C-2-1] MUST use an mandatory access control system that is equivalent to SELinux.

9.8. Privacy

9.8.1. Usage History

Android stores the history of the user's choices and manages such history by UsageStatsManager .

پیاده سازی دستگاه:

• [C-1-1] MUST keep a reasonable retention period of such user history.
• [SR] Are STRONGLY RECOMMENDED to keep the 14 days retention period as configured by default in the AOSP implementation.

9.8.2. Recording

If device implementations include functionality in the system that captures the contents displayed on the screen and/or records the audio stream played on the device, they:

• [C-1-1] MUST have an ongoing notification to the user whenever this functionality is enabled and actively capturing/recording.

If device implementations include a component enabled out-of-box, capable of recording ambient audio to infer useful information about user's context, they:

• [C-2-1] MUST NOT store in persistent on-device storage or transmit off the device the recorded raw audio or any format that can be converted back into the original audio or a near facsimile, except with explicit user consent.

9.8.3. Connectivity

If device implementations have a USB port with USB peripheral mode support, they:

• [C-1-1] MUST present a user interface asking for the user's consent before allowing access to the contents of the shared storage over the USB port.

9.8.4. Network Traffic

پیاده سازی دستگاه:

• [C-0-1] MUST preinstall the same root certificates for the system-trusted Certificate Authority (CA) store as provided in the upstream Android Open Source Project.
• [C-0-2] MUST ship with an empty user root CA store.
• [C-0-3] MUST display a warning to the user indicating the network traffic may be monitored, when a user root CA is added.

If device traffic is routed through a VPN, device implementations:

• [C-1-1] MUST display a warning to the user indicating either:
  • That network traffic may be monitored.
  • That network traffic is being routed through the specific VPN application providing the VPN.

If device implementations have a mechanism, enabled out-of-box by default, that routes network data traffic through a proxy server or VPN gateway (for example, preloading a VPN service with android.permission.CONTROL_VPN granted), they:

• [C-2-1] MUST ask for the user's consent before enabling that mechanism, unless that VPN is enabled by the Device Policy Controller via the DevicePolicyManager.setAlwaysOnVpnPackage() , in which case the user does not need to provide a separate consent, but MUST only be notified.

If device implementations implement a user affordance to toggle on the "always-on VPN" function of a 3rd-party VPN app, they:

• [C-3-1] MUST disable this user affordance for apps that do not support always-on VPN service in the AndroidManifest.xml file via setting the SERVICE_META_DATA_SUPPORTS_ALWAYS_ON attribute to false .

9.9. Data Storage Encryption

If device implementations support a secure lock screen as described in section 9.11.1 , they:

• [C-1-1] MUST support data storage encryption of the application private data ( /data partition ), as well as the application shared storage partition ( /sdcard partition ) if it is a permanent, non-removable part of the device.

If device implementations support a secure lock screen as described in section 9.11.1 and support data storage encryption with Advanced Encryption Standard (AES) crypto performance above 50MiB/sec, they:

• [C-2-1] MUST enable the data storage encryption by default at the time the user has completed the out-of-box setup experience. If device implementations are already launched on an earlier Android version with encryption disabled by default, such a device cannot meet the requirement through a system software update and thus MAY be exempted.

• SHOULD meet the above data storage encryption requirement via implementing File Based Encryption (FBE).

9.9.1. Direct Boot

پیاده سازی دستگاه:

• [C-0-1] MUST implement the Direct Boot mode APIs even if they do not support Storage Encryption.

• [C-0-2] The ACTION_LOCKED_BOOT_COMPLETED and ACTION_USER_UNLOCKED Intents MUST still be broadcast to signal Direct Boot aware applications that Device Encrypted (DE) and Credential Encrypted (CE) storage locations are available for user.

9.9.2. File Based Encryption

If device implementations support FBE, they:

• [C-1-1] MUST boot up without challenging the user for credentials and allow Direct Boot aware apps to access to the Device Encrypted (DE) storage after the ACTION_LOCKED_BOOT_COMPLETED message is broadcasted.
• [C-1-2] MUST only allow access to Credential Encrypted (CE) storage after the user has unlocked the device by supplying their credentials (eg. passcode, pin, pattern or fingerprint) and the ACTION_USER_UNLOCKED message is broadcasted.
• [C-1-3] MUST NOT offer any method to unlock the CE protected storage without the user-supplied credentials.
• [C-1-4] MUST support Verified Boot and ensure that DE keys are cryptographically bound to the device's hardware root of trust.
• [C-1-5] MUST support encrypting file contents using AES with a key length of 256-bits in XTS mode.

• [C-1-6] MUST support encrypting file name using AES with a key length of 256-bits in CBC-CTS mode.

• The keys protecting CE and DE storage areas:

• [C-1-7] MUST be cryptographically bound to a hardware-backed Keystore.

• [C-1-8] CE keys MUST be bound to a user's lock screen credentials.
• [C-1-9] CE keys MUST be bound to a default passcode when the user has not specified lock screen credentials.

• [C-1-10] MUST be unique and distinct, in other words no user's CE or DE key matches any other user's CE or DE keys.

• SHOULD make preloaded essential apps (eg Alarm, Phone, Messenger) Direct Boot aware.

• MAY support alternative ciphers, key lengths and modes for file content and file name encryption, but MUST use the mandatorily supported ciphers, key lengths and modes by default.

The upstream Android Open Source project provides a preferred implementation of this feature based on the Linux kernel ext4 encryption feature.

9.9.3. Full Disk Encryption

If device implementations support full disk encryption (FDE), they:

• [C-1-1] MUST use AES with a key of 128-bits (or greater) and a mode designed for storage (for example, AES-XTS, AES-CBC-ESSIV).
• [C-1-2] MUST use a default passcode to wrap the encryption key and MUST NOT write the encryption key to storage at any time without being encrypted.
• [C-1-3] MUST AES encrypt the encryption key by default unless the user explicitly opts out, except when it is in active use, with the lock screen credentials stretched using a slow stretching algorithm (eg PBKDF2 or scrypt).
• [C-1-4] The above default password stretching algorithm MUST be cryptographically bound to that keystore when the user has not specified a lock screen credentials or has disabled use of the passcode for encryption and the device provides a hardware-backed keystore.
• [C-1-5] MUST NOT send encryption key off the device (even when wrapped with the user passcode and/or hardware bound key).

The upstream Android Open Source project provides a preferred implementation of this feature, based on the Linux kernel feature dm-crypt.

9.10. Device Integrity

The following requirements ensures there is transparency to the status of the device integrity. پیاده سازی دستگاه:

• [C-0-1] MUST correctly report through the System API method PersistentDataBlockManager.getFlashLockState() whether their bootloader state permits flashing of the system image. The FLASH_LOCK_UNKNOWN state is reserved for device implementations upgrading from an earlier version of Android where this new system API method did not exist.

Verified boot is a feature that guarantees the integrity of the device software. If a device implementation supports the feature, it:

• [C-1-1] MUST declare the platform feature flag android.software.verified_boot .
• [C-1-2] MUST perform verification on every boot sequence.
• [C-1-3] MUST start verification from an immutable hardware key that is the root of trust and go all the way up to the system partition.
• [C-1-4] MUST implement each stage of verification to check the integrity and authenticity of all the bytes in the next stage before executing the code in the next stage.
• [C-1-5] MUST use verification algorithms as strong as current recommendations from NIST for hashing algorithms (SHA-256) and public key sizes (RSA-2048).
• [C-1-6] MUST NOT allow boot to complete when system verification fails, unless the user consents to attempt booting anyway, in which case the data from any non-verified storage blocks MUST not be used.
• [C-1-7] MUST NOT allow verified partitions on the device to be modified unless the user has explicitly unlocked the boot loader.
• [SR] If there are multiple discrete chips in the device (eg radio, specialized image processor), the boot process of each of those chips is STRONGLY RECOMMENDED to verify every stage upon booting.
• [SR] STRONGLY RECOMMENDED to use tamper-evident storage: for when the bootloader is unlocked. Tamper-evident storage means that the boot loader can detect if the storage has been tampered with from inside the HLOS (High Level Operating System).
• [SR] STRONGLY RECOMMENDED to prompt the user, while using the device, and require physical confirmation before allowing a transition from boot loader locked mode to boot loader unlocked mode.
• [SR] STRONGLY RECOMMENDED to implement rollback protection for the HLOS (eg boot, system partitions) and to use tamper-evident storage for storing the metadata used for determining the minimum allowable OS version.
• SHOULD implement rollback protection for any component with persistent firmware (eg modem, camera) and SHOULD use tamper-evident storage for storing the metadata used for determining the minimum allowable version.

The upstream Android Open Source Project provides a preferred implementation of this feature in the external/avb/ repository, which can be integrated into the boot loader used for loading Android.

If device implementations report the feature flag android.hardware.ram.normal , they:

• [C-2-1] MUST support verified boot for device integrity.

If a device implementation is already launched without supporting verified boot on an earlier version of Android, such a device can not add support for this feature with a system software update and thus are exempted from the requirement.

9.11. Keys and Credentials

The Android Keystore System allows app developers to store cryptographic keys in a container and use them in cryptographic operations through the KeyChain API or the Keystore API . پیاده سازی دستگاه:

• [C-0-1] MUST at least allow more than 8,192 keys to be imported.
• [C-0-2] The lock screen authentication MUST rate-limit attempts and MUST have an exponential backoff algorithm. Beyond 150 failed attempts, the delay MUST be at least 24 hours per attempt.
• SHOULD not limit the number of keys that can be generated

When the device implementation supports a secure lock screen, it:

• [C-1-1] MUST back up the keystore implementation with secure hardware.
• [C-1-2] MUST have implementations of RSA, AES, ECDSA and HMAC cryptographic algorithms and MD5, SHA1, and SHA-2 family hash functions to properly support the Android Keystore system's supported algorithms in an area that is securely isolated from the code running on the kernel and above. Secure isolation MUST block all potential mechanisms by which kernel or userspace code might access the internal state of the isolated environment, including DMA. The upstream Android Open Source Project (AOSP) meets this requirement by using the Trusty implementation, but another ARM TrustZone-based solution or a third-party reviewed secure implementation of a proper hypervisor-based isolation are alternative options.
• [C-1-3] MUST perform the lock screen authentication in the isolated execution environment and only when successful, allow the authentication-bound keys to be used. Lock screen credentials MUST be stored in a way that allows only the isolated execution environment to perform lock screen authentication. The upstream Android Open Source Project provides the Gatekeeper Hardware Abstraction Layer (HAL) and Trusty, which can be used to satisfy this requirement.
• [C-1-4] MUST support key attestation where the attestation signing key is protected by secure hardware and signing is performed in secure hardware. The attestation signing keys MUST be shared across large enough number of devices to prevent the keys from being used as device identifiers. One way of meeting this requirement is to share the same attestation key unless at least 100,000 units of a given SKU are produced. If more than 100,000 units of an SKU are produced, a different key MAY be used for each 100,000 units.

Note that if a device implementation is already launched on an earlier Android version, such a device is exempted from the requirement to have a hardware-backed keystore, unless it declares the android.hardware.fingerprint feature which requires a hardware-backed keystore.

9.11.1. Secure Lock Screen

If device implementations have a secure lock screen and include one or more trust agent, which implements the TrustAgentService System API, then they:

• [C-1-1] MUST indicate the user in the Settings and Lock screen user interface of situations where either the screen auto-lock is deferred or the screen lock can be unlocked by the trust agent. The AOSP meets the requirement by showing a text description for the "Automatically lock setting" and "Power button instantly locks setting" menus and a distinguishable icon on the lock screen.
• [C-1-2] MUST respect and fully implement all trust agent APIs in the DevicePolicyManager class, such as the KEYGUARD_DISABLE_TRUST_AGENTS constant.
• [C-1-3] MUST NOT fully implement the TrustAgentService.addEscrowToken() function on a device that is used as the primary personal device (eg handheld) but MAY fully implement the function on device implementations typically shared.
• [C-1-4] MUST encrypt the tokens added by TrustAgentService.addEscrowToken() before storing them on the device.
• [C-1-5] MUST NOT store the encryption key on the device.
• [C-1-6] MUST inform the user about the security implications before enabling the escrow token to decrypt the data storage.

If device implementations add or modify the authentication methods to unlock the lock screen, then for such an authentication method to be treated as a secure way to lock the screen, they:

• [C-2-1] MUST be the user authentication method as described in Requiring User Authentication For Key Use .
• [C-2-2] MUST unlock all keys for a third-party developer app to use when the user unlocks the secure lock screen. For example, all keys MUST be available for a third-party developer app through relevant APIs, such as createConfirmDeviceCredentialIntent and setUserAuthenticationRequired .

If device implementations add or modify the authentication methods to unlock the lock screen if based on a known secret then for such an authentication method to be treated as a secure way to lock the screen, they:

• [C-3-1] The entropy of the shortest allowed length of inputs MUST be greater than 10 bits.
• [C-3-2] The maximum entropy of all possible inputs MUST be greater than 18 bits.
• [C-3-3] MUST not replace any of the existing authentication methods (PIN,pattern, password) implemented and provided in AOSP.
• [C-3-4] MUST be disabled when the Device Policy Controller (DPC) application has set the password quality policy via the DevicePolicyManager.setPasswordQuality() method with a more restrictive quality constant than PASSWORD_QUALITY_SOMETHING .

If device implementations add or modify the authentication methods to unlock the lock screen if based on a physical token or the location, then for such an authentication method to be treated as a secure way to lock the screen, they:

• [C-4-1] MUST have a fall-back mechanism to use one of the primary authentication methods which is based on a known secret and meets the requirements to be treated as a secure lock screen.
• [C-4-2] MUST be disabled and only allow the primary authentication to unlock the screen when the Device Policy Controller (DPC) application has set the policy with either the DevicePolicyManager.setKeyguardDisabledFeatures(KEYGUARD_DISABLE_TRUST_AGENTS) method or the DevicePolicyManager.setPasswordQuality() method with a more restrictive quality constant than PASSWORD_QUALITY_UNSPECIFIED .
• [C-4-3] The user MUST be challenged for the primary authentication (egPIN, pattern, password) at least once every 72 hours or less.

If device implementations add or modify the authentication methods to unlock the lock screen based on biometrics, then for such an authentication method to be treated as a secure way to lock the screen, they:

• [C-5-1] MUST have a fall-back mechanism to use one of the primary authentication methods which is based on a known secret and meets the requirements to be treated as a secure lock screen.
• [C-5-2] MUST be disabled and only allow the primary authentication to unlock the screen when the Device Policy Controller (DPC) application has set the keguard feature policy by calling the method DevicePolicyManager.setKeyguardDisabledFeatures(KEYGUARD_DISABLE_FINGERPRINT) .
• [C-5-3] MUST have a false acceptance rate that is equal or stronger than what is required for a fingerprint sensor as described in section 7.3.10, or otherwise MUST be disabled and only allow the primary authentication to unlock the screen when the Device Policy Controller (DPC) application has set the password quality policy via the DevicePolicyManager.setPasswordQuality() method with a more restrictive quality constant than PASSWORD_QUALITY_BIOMETRIC_WEAK .
• [SR] Are STRONGLY RECOMMENDED to have spoof and imposter acceptance rates that are equal to or stronger than what is required for a fingerprint sensor as described in section 7.3.10.

If the spoof and imposter acceptance rates are not equal to or stronger than what is required for a fingerprint sensor as described in section 7.3.10 and the Device Policy Controller (DPC) application has set the password quality policy via the DevicePolicyManager.setPasswordQuality() method with a more restrictive quality constant than PASSWORD_QUALITY_BIOMETRIC_WEAK , then:

• [C-6-1] MUST disable these biometric methods and allow only the primary authentication to unlock the screen.
• [C-6-2] MUST challenge the user for the primary authentication (egPIN, pattern, password) at least once every 72 hours or less.

If device implementations add or modify the authentication methods to unlock the lock screen and if such an authentication method will be used to unlock the keyguard, but will not be treated as a secure lock screen, then they:

• [C-7-1] MUST return false for both the KeyguardManager.isKeyguardSecure() and the KeyguardManager.isDeviceSecure() methods.
• [C-7-2] MUST be disabled when the Device Policy Controller (DPC) application has set the password quality policy via the DevicePolicyManager.setPasswordQuality() method with a more restrictive quality constant than PASSWORD_QUALITY_UNSPECIFIED .
• [C-7-3] MUST NOT reset the password expiration timers set by DevicePolicyManager.setPasswordExpirationTimeout() .
• [C-7-4] MUST NOT authenticate access to keystores if the application has called KeyGenParameterSpec.Builder.setUserAuthenticationRequired(true) ).

9.12. Data Deletion

All device implementations:

• [C-0-1] MUST provide users a mechanism to perform a "Factory Data Reset".
• [C-0-2] MUST delete all user-generated data. That is, all data except for the following:
  • The system image
  • Any operating system files required by the system image
• [C-0-3] MUST delete the data in such a way that will satisfy relevant industry standards such as NIST SP800-88.
• [C-0-4] MUST trigger the above "Factory Data Reset" process when the DevicePolicyManager.wipeData() API is called by the primary user's Device Policy Controller app.
• MAY provide a fast data wipe option that conducts only a logical data erase.

9.13. Safe Boot Mode

Android provides Safe Boot Mode, which allows users to boot up into a mode where only preinstalled system apps are allowed to run and all third-party apps are disabled. This mode, known as "Safe Boot Mode", provides the user the capability to uninstall potentially harmful third-party apps.

Device implementations are:

• [SR] STRONGLY RECOMMENDED to implement Safe Boot Mode.

If device implementations implement Safe Boot Mode, they:

• [C-1-1] MUST provide the user an option to enter Safe Boot Mode in such a way that is uninterruptible from third-party apps installed on the device, except when the third-party app is a Device Policy Controller and has set the UserManager.DISALLOW_SAFE_BOOT flag as true.

• [C-1-2] MUST provide the user the capability to uninstall any third-party apps within Safe Mode.

• SHOULD provide the user an option to enter Safe Boot Mode from the boot menu using a workflow that is different from that of a normal boot.

9.14. Automotive Vehicle System Isolation

Android Automotive devices are expected to exchange data with critical vehicle subsystems by using the vehicle HAL to send and receive messages over vehicle networks such as CAN bus.

The data exchange can be secured by implementing security features below the Android framework layers to prevent malicious or unintentional interaction with these subsystems.

10. Software Compatibility Testing

Device implementations MUST pass all tests described in this section.

However, note that no software test package is fully comprehensive. For this reason, device implementers are STRONGLY RECOMMENDED to make the minimum number of changes as possible to the reference and preferred implementation of Android available from the Android Open Source Project. This will minimize the risk of introducing bugs that create incompatibilities requiring rework and potential device updates.

10.1. Compatibility Test Suite

Device implementations MUST pass the Android Compatibility Test Suite (CTS) available from the Android Open Source Project, using the final shipping software on the device. Additionally, device implementers SHOULD use the reference implementation in the Android Open Source tree as much as possible, and MUST ensure compatibility in cases of ambiguity in CTS and for any reimplementations of parts of the reference source code.

The CTS is designed to be run on an actual device. Like any software, the CTS may itself contain bugs. The CTS will be versioned independently of this Compatibility Definition, and multiple revisions of the CTS may be released for Android 8.1. Device implementations MUST pass the latest CTS version available at the time the device software is completed.

10.2. CTS Verifier

Device implementations MUST correctly execute all applicable cases in the CTS Verifier. The CTS Verifier is included with the Compatibility Test Suite, and is intended to be run by a human operator to test functionality that cannot be tested by an automated system, such as correct functioning of a camera and sensors.

The CTS Verifier has tests for many kinds of hardware, including some hardware that is optional. Device implementations MUST pass all tests for hardware that they possess; for instance, if a device possesses an accelerometer, it MUST correctly execute the Accelerometer test case in the CTS Verifier. Test cases for features noted as optional by this Compatibility Definition Document MAY be skipped or omitted.

Every device and every build MUST correctly run the CTS Verifier, as noted above. However, since many builds are very similar, device implementers are not expected to explicitly run the CTS Verifier on builds that differ only in trivial ways. Specifically, device implementations that differ from an implementation that has passed the CTS Verifier only by the set of included locales, branding, etc. MAY omit the CTS Verifier test.

11. Updatable Software

Device implementations MUST include a mechanism to replace the entirety of the system software. The mechanism need not perform “live” upgrades—that is, a device restart MAY be required.

Any method can be used, provided that it can replace the entirety of the software preinstalled on the device. For instance, any of the following approaches will satisfy this requirement:

• “Over-the-air (OTA)” downloads with offline update via reboot.
• “Tethered” updates over USB from a host PC.
• “Offline” updates via a reboot and update from a file on removable storage.

However, if the device implementation includes support for an unmetered data connection such as 802.11 or Bluetooth PAN (Personal Area Network) profile, it MUST support OTA downloads with offline update via reboot.

The update mechanism used MUST support updates without wiping user data. That is, the update mechanism MUST preserve application private data and application shared data. Note that the upstream Android software includes an update mechanism that satisfies this requirement.

For device implementations that are launching with Android 6.0 and later, the update mechanism SHOULD support verifying that the system image is binary identical to expected result following an OTA. The block-based OTA implementation in the upstream Android Open Source Project, added since Android 5.1, satisfies this requirement.

Also, device implementations SHOULD support A/B system updates . The AOSP implements this feature using the boot control HAL.

If an error is found in a device implementation after it has been released but within its reasonable product lifetime that is determined in consultation with the Android Compatibility Team to affect the compatibility of third-party applications, the device implementer MUST correct the error via a software update available that can be applied per the mechanism just described.

Android includes features that allow the Device Owner app (if present) to control the installation of system updates. To facilitate this, the system update subsystem for devices that report android.software.device_admin MUST implement the behavior described in the SystemUpdatePolicy class.

12. Document Changelog

For a summary of changes to the Compatibility Definition in this release:

• Document changelog

For a summary of changes to individuals sections:

1. Introduction
2. Device Types
3. Software
4. Application Packaging
5. Multimedia
6. Developer Tools and Options
7. Hardware Compatibility
8. Performance and Power
9. Security Model
10. Software Compatibility Testing
11. Updatable Software
12. Document Changelog
13. Contact Us

12.1. Changelog Viewing Tips

Changes are marked as follows:

• CDD
  Substantive changes to the compatibility requirements.

• Docs
  Cosmetic or build related changes.

For best viewing, append the pretty=full and no-merges URL parameters to your changelog URLs.

13. Contact Us

You can join the android-compatibility forum and ask for clarifications or bring up any issues that you think the document does not cover.