Welcome to the Android Open Source Project!

Android is an open source software stack for a wide range of mobile devices and a corresponding open source project led by Google. This site offers the information and source code you need to create custom variants of the Android stack, port devices and accessories to the Android platform, and ensure your devices meet compatibility requirements.

What's New

Videos and Other Resources for Audio Implementation

The Audio team offers video on buffer sizes and their relationship to audio latency, as well as other videos on improving audio performance and related clarifications to text throughout the Audio section.

CTS 5.1 R2

Packages for the 5.1 R2 version of the Android Compatibility Test Suite (CTS) are available for download.

SELinux neverallow Rules

New guidance has been offered on the use of Security-Enhanced Linux (SELinux) neverallow rules, which prohibit behavior that should never occur.

Build Numbers for Nexus 6 and 7

Build numbers LYZ28E and LMY48G have been added for Nexus 6 (T-Mobile ONLY) and Nexus 7 (flo), respectively.

Security Updates and Resources

Security Updates and Resources has been rewritten entirely to describe the processes for reporting security issues, triaging bugs, notifying partners, and much more.

Sign OTA Packages and Release Keys

Signing Builds for Release now contains sections on Release Keys and Signing OTA packages that provide easy recipes for signing flashable images and over-the-air (OTA) updates.

5.1 Compatibility Definition Document

The Android 5.1 Compatibility Definition Document (CDD) has been published to reflect the requirements of the latest version of Android.

Getting Started

Explore the Source

Get the complete Android platform and modify and build it to suit your needs. You can also contribute to the Android Open Source Project (AOSP) repository to make your changes available to everyone else in the Android ecosystem.

Android framework summary

Port Android to Devices

Port the latest Android platform and create compelling devices that your customers want.

Build Accessories

Sometimes, a device can't do it all. Tap into Android's open accessory standard and build accessories to complement the wide variety of Android-powered devices.

Get Compatible

Being Android-compatible lets you offer custom features but still give users and developers a consistent and standard experience across all Android-powered devices. Android provides guidance and a test suite to verify your Android compatibility.

Help this Site

Please note, source.android.com is maintained in the Android Open Source Project. See the docs/source.android.com project log in AOSP for the complete list of changes to this site. Contribute your own updates to that same project and help maintain source.android.com.