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<h1 itemprop="name" style="margin-bottom:0;">Welcome to the Android Open Source Project!</h1>

<p>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.</p>

<h2 align="center">Android 7.0 Updates Available</h2>

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  <h3>What's New</h3>

<h4>New Android Build Numbers and CTS Downloads</h4>
<p>Android 7.0 R.1, 6.0 R9, 5.1 R10, and 5.0 R9 Compatibility Test Suite (CTS)
and CTS Verifier are available for <strong><a
href="{@docRoot}compatibility/cts/downloads.html#android-70">Download</a></strong>.
Also, new <strong><a
href="{@docRoot}source/build-numbers.html#source-code-tags-and-builds">Build
Numbers</a></strong> have been published for Android 7.0 on Nexus 6P, Nexus 5X,
Nexus 9 (volantis), Nexus Player, and Pixel C and Android 6.0 on Nexus 5, Nexus
5X, Nexus 6, Nexus 6P, and Nexus 9 (volantis).</p>

<h4>Feedback Fixes</h4>
<p>User feedback has resulted in the addition of the <a
href="https://g.co/ABH">g.co/ABH</a> warning about operating system safety to
the <em>User experience</em> section of <strong><a
href="{@docRoot}security/verifiedboot/verified-boot.html#user_experience">Verifying
Boot</a></strong> and timing of security updates to Nexus devices in <strong><a
href="{@docRoot}security/bulletin/index.html">Android Security
Bulletins</a></strong>. In addition, <strong><a
href="{@docRoot}source/read-bug-reports.html">Reading Bug Reports</a></strong>
now contains information on event log tags, wake locks, and Bluetooth Low
Energy (BLE) scans.</p>

<h4>Key Features</h4>
<p>
<a href="{@docRoot}devices/tech/dalvik/jit-compiler.html"><strong>Just-in-time
(JIT) compiler</strong></a> with code profiling to Android runtime (ART)
continually improves app performance and now offers <a
href="{@docRoot}devices/tech/dalvik/jit-compiler.html#recommendation"><strong>Recommendations</a></strong>
for use. <a
href="{@docRoot}security/encryption/file-based.html"><strong>Direct boot and
file-based encryption</strong></a> allows certain apps to run securely when
the device is powered on but not unlocked.
<a href="{@docRoot}devices/tech/display/multi-window.html"><strong>Multi-window</strong></a>
support enables simultaneous display of multiple apps on a device screen.
The <a href="{@docRoot}devices/automotive.html"><strong>Vehicle
HAL</strong></a> enables Android Automotive implementations.</p>

<h4>Security Improvements</h4>
<p>
Android now strictly enforces
<a href="{@docRoot}security/verifiedboot/verified-boot.html"><strong>verified
boot</strong></a> and requires a
<a href="{@docRoot}security/overview/app-security.html#certificate-authorities"><strong>same-system
trusted CA store</strong></a>.
<a href="{@docRoot}security/apksigning/index.html#v2"><strong>APK signature
scheme v2</strong></a> performs signature checking across the entire file.
Security hardening of <a href="{@docRoot}devices/media/framework-hardening.html"><strong>media
framework</strong></a> and
<a href="{@docRoot}devices/camera/versioning.html#hardening">camera service</strong></a>
splits mediaserver into multiple processes with restricted permissions and
capabilities (may require changes to HAL implementations).
For more changes, see
<a href="{@docRoot}security/enhancements/enhancements70.html"><strong>7.0
security enhancements</strong></a>.</p>

<h4>Audio, Camera, &amp; Graphics Updates</h4>
<p>
<a href="{@docRoot}devices/audio/implement-policy.html"><strong>Audio policy
improvements</strong></a> include changes to policy configuration files, a
reorganization of audio policy code, and new extensions for audio policy routing
APIs.
Android now supports
<a href="{@docRoot}devices/graphics/arch-vulkan.html"><strong>Vulkan</strong></a>
(low­-overhead, cross-platform API for high-performance 3D graphics) and
<a href="{@docRoot}devices/graphics/testing.html"><strong>OpenGL
3.2</strong></a>; check with your SoC for driver support.
Enhancements to
<a href="{@docRoot}devices/camera/versioning.html"><strong>camera3</strong></a>
support devices with high-end cameras.</p>

<h4>OEM Customizations</h4>
<p>Users can now
<a href="{@docRoot}devices/tech/connect/block-numbers.html"><strong>restrict
calls and texts</strong></a> (impacts apps using blocking features).
Do-not-disturb (DND) rules can now
<a href="{@docRoot}devices/tech/display/dnd.html"><strong>suppress visual
interruptions</strong></a>.</p>

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<h3>Getting Started</h3>
<a href="{@docRoot}source/index.html"><h4>Explore the Source</h4></a>
<p>Get the complete Android platform and modify and build it to suit your needs.
You can also
<strong><a href="https://android-review.googlesource.com/#/q/status:open">contribute
to</a></strong> the <strong><a href="https://android.googlesource.com/">Android
Open Source Project (AOSP) repository</a></strong> to make your changes
available to everyone else in the Android ecosystem.</p>

<a href="{@docRoot}source/index.html"><img border="0"
src="images/android_framework_small.png" alt="Android framework summary"
style="display:inline;float:right;margin:5px 10px;width:42%;height:42%"></a>

<a href="{@docRoot}devices/index.html"><h4>Port Android to Devices</h4></a>
<p>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.</p>

<a href="{@docRoot}security/index.html"><h4>Make Secure</h4></a>
<p>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.</p>

<a href="{@docRoot}compatibility/index.html"><h4>Get Compatible</h4></a>
<p>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.</p>

<a href="https://android.googlesource.com/platform/docs/source.android.com/">
<h4>Help this Site</h4></a>
<p>Use the <strong>Site Feedback</strong> 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
<strong><a href="https://android.googlesource.com/platform/docs/source.android.com/+log/master">docs/source.android.com.</a></strong></p>
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