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. Here you can find the information and source code you need to learn more about the Android platform. From there you can create custom variants of the Android software stack, port devices and accessories to the Android platform, and ensure your devices are compatible with the Android compatibility definition.

What's New

SELinux instructions revised

The entire set of Security-Enhanced Linux instructions have been revised thanks to open source contributions.

Compatibility manual and CTS updated, CDD source made available

New versions of the Compatibility Test Suite (5.0_r2) and the CTS Manual have been uploaded to the site. HTML versions of the 5.0 and 4.4 Compatibility Definition Documents (CDD) have been uploaded to AOSP for easy diffing.

Audio terminology enhanced

Audio Terminology has been updated to include definitions for FIFO, lossy, transparency, and more.

Using Repo and Mac OS initializing instructions fixed

The POSIXLY_CORRECT entry and Java 7 link within the Mac OS initializing instructions have been updated. And the Repo command reference has been revised to remove the replace option and point to help for the latest instructions.

Nexus 7 build tag updated

The LRX22G build tag now applies to the deb and tilapia variants of Nexus 7.

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 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.