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

Android 4.4.4 released

Builds for Android 4.4.4 have been released. See the Source Code Tags and Builds table on Codenames, Tags, and Build Numbers for the new builds, tags, and devices supported.

Android 4.4 CTS packages updated

Revision 3 of the Android 4.4 Compatibility Test Suite (CTS) and Android 4.4 CTS Verifier have been added to Compatibility Downloads. Packages for x86 architectures are included for the first time.

ART introduction completely revised

Introducing ART has been rewritten to reflect forthcoming changes and prepare developers and manufacturers for the runtime's adoption.

Brand guidelines published

Manufacturers have their own set of guidelines for Android brand use.

Graphics architecture document published

Android engineering describes the system-level Graphics Architecture in great detail.

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.

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.