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 and the Android Open Source Project (AOSP) repository offer 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 7.0 Updates Available

What's New

A/B System Updates

A/B system updates ensure a workable booting system remains on the disk during an over-the-air (OTA) update, reducing the likelihood of an inactive device afterward. See A/B System Updates for a detailed description of this feature and instructions for implementing it.

November Android Security Bulletin

The November 2016 Android Security Bulletin has been published along with links to associated fixes. In addition, new build numbers have been published for Pixel, Pixel XL, Pixel C, Nexus 6, Nexus 9, Nexus 5X, Nexus 6P, and Nexus Player running Android 6.0.1, 7.0, and 7.1 to support the November Android security release.

New CTS Downloads

Android 7.0 R3, Android 6.0 R12, and Android 5.1 R13 versions of the Compatibility Test Suite (CTS) and CTS Verifier are available for Download.

Android 7.0 CDD is Here

The Android Compatibility Definition Document (CDD) for Android 7.0 on the API level 24 is now available to the public.

Using Filters for Smaller System Images

Implementing ART Just-In-Time (JIT) Compiler now contains recommendations for minimizing the system image size with the interpret-only filter in JIT.

Panic Button Support for Indian Phones

AOSP now provides support for the Panic button required on phones sold in India from 1 January 2017 through the Emergency Affordance feature. See the guide for details on enabling this feature.

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 AOSP repository to make your changes available to everyone else in the Android ecosystem.

Android framework summary

Port Android to Devices

Get help porting the latest Android platform to create compelling devices for your customers. Includes documentation for HAL interfaces and details on core technologies such as Android runtime (ART) and over-the-air (OTA) updates.

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 how 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 content improvements or let us know about errors. To contribute your own updates to the site or to view a complete list of site changes, use the AOSP project docs/source.android.com.