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.

Android 6.0 Updates Available — see details below

What's New

Android 6.0, 5.1, and 5.0 CTS Downloads

Android 6.0 R3, 5.1 R5, and 5.0 R4 Compatibility Test Suite (CTS) and CTS Verifier are available for Download.

JDK 8 for Latest Platform Development

The master branch of Android now requires JDK 8 to build. See Requirements for a summary of Java versions by Android release. See Setting up a Linux build environment or Setting up a Mac OS build environment for update instructions by operating system.

Reading Bug Reports

Android Engineering has written a detailed guide for understanding device-generated bug reports. This guide describes and provides examples of common errors and their associated causes, such as low memory. It even explains how to establish a narrative of the issue by syncing timelines across logs.

Rotation Vector CV Crosscheck

Instructions now exist for the CTS Verifier Rotation Vector CV Crosscheck used to properly test the compatibility of rotation vector sensor implementations.

Security Bulletins

The Android security team now publishes monthly Nexus Security Bulletins describing key vulnerabilities fixed in AOSP with links to associated changes.

Lollipop and Marshmallow Build Numbers

New Build Numbers have been published for Lollipop on Nexus 6, Nexus 7 (deb), Nexus 9 (volantisg), Nexus 10 and Marshmallow on Nexus 5, Nexus 5X, Nexus 6, Nexus 6P, Nexus 7 (flo/deb), Nexus 9 (volantis/volantisg), and Nexus Player.

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.