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

Android Security 2015 Year in Review

The Android Security team has published its 2015 Year In Review and a new document of Classifications for Potentially Harmful Applications.

Build Numbers for April Security Updates

New build numbers have been published for Pixel C, Nexus 5, Nexus 6, Nexus 7, Nexus 9, Nexus 5X, Nexus 6P, Nexus Player, and Android One running Android 6.0 and Nexus 10 running Android 5.1.

April Nexus Security Bulletin

The April 2016 Nexus Security Bulletin has been published. The bulletin describes numerous vulnerabilities that have been fixed in the Android Open Source Project (AOSP).

CTS Media Files 1.2

A new version of the media files required for Android Compatibility Test Suite (CTS) media stress tests is now available for download.

Android Security Advisories

The Android security team has released its first advisory, a supplement to Nexus Security Bulletins that may not require security patches or Nexus device updates but could still affect an Android user's overall security.

Requirements Expanded, Build Environment Simplified

The Android build Requirements have been expanded to include both the operating system and Java version needed for each Android version and also broken down into hardware and software requirements. Conversely, these same requirements have been removed from Establishing a Build Environment to separate those reference materials from the steps needed to set up your workstation.

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.

Make Secure

Follow these examples and instructions to harden your Android devices against malicious attacks. Find out how the Android security program works and learn to implement the latest features.

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

Use the Site Feedback button at the bottom of any page to request improvements to the content or identify errors. In addition, 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.