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page.metaDescription=The official site for the Android Open Source Project.
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<div class="landing-banner">
<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>
</div>
</div>
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<h3>What's New</h3>
<a href="{@docRoot}devices/tech/security/verifiedboot/verified-boot.html">
<h4>Verified Boot Improvements</h4></a>
<p><strong><a
href="{@docRoot}devices/tech/security/verifiedboot/verified-boot.html#classes">Verifying
Boot</a></strong> has been rewritten to remove the VERIFIED state and Keystore
format and add details on implementation classes, communicating boot state, and
kernel command line parameters. And performance recommendations have been added
to <strong><a
href="{@docRoot}devices/tech/security/verifiedboot/dm-verity.html#optimize">Implementing
dm-verity</a></strong>.</p>
<a href="{@docRoot}source/building.html">
<h4>Increased Disk Space Requirements</h4></a>
<p>The amount of available disk space required to build Android has
been increased to a minimum of 100GB in <strong><a
href="{@docRoot}source/building.html">Downloading and Building</a></strong>.</p>
<a href="{@docRoot}compatibility/cts/index.html">
<h4>Compatibility Test Suite User Instructions</h4></a>
<p>The <strong><a
href="{@docRoot}compatibility/cts/index.html">Compatibility Test Suite (CTS)
User Manual</a></strong> previously presented as a PDF has been converted to native web
pages and updated to improve clarity.</p>
<a href="{@docRoot}devices/halref/index.html">
<h4>Hardware Abstraction Layer References</h4></a>
<p>The <strong><a href="{@docRoot}devices/halref/index.html">Hardware
Abstraction Layer (HAL) reference files</a></strong> have been updated to
reflect the latest development, such as the introduction of
<code>AUDIO_PARAMETER_DEVICE_CONNECT</code> to <strong><a
href="{@docRoot}devices/halref/audio_8h_source.html">audio.h</a></strong>.</p>
<a href="{@docRoot}devices/tech/debug/dumpsys.html">
<h4>Example Dumpsys Diagnostic Output</h4></a>
<p>In addition to the aforementioned <strong><a
href="{@docRoot}devices/input/diagnostics.html">Input
Diagnostics</a></strong>, you can now find Dumpsys examples of usage
data for <strong><a href="{@docRoot}devices/tech/ram/procstats.html">RAM
(procstats)</a></strong>, <strong><a
href="{@docRoot}devices/tech/netstats.html">network (netstats)</a></strong>,
and <strong><a
href="{@docRoot}devices/tech/power/batterystats.html">battery (batterystats)</a></strong>.</p>
<a href="{@docRoot}devices/audio/latency_measurements.html">
<h4>Audio Latency Measurements</h4></a>
<p>The Android audio team has published <strong><a
href="{@docRoot}devices/audio/latency_measurements.html">round-trip audio latency
measurements</a></strong> for select Nexus devices to help partners compare their
own devices and reduce latency further.</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>Port the latest Android platform and
create compelling devices that your customers want.</p>
<a href="{@docRoot}accessories/index.html">
<h4>Build Accessories</h4></a>
<p>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.</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>Please note, source.android.com is maintained in the Android Open Source Project. See the <strong><a
href="https://android.googlesource.com/platform/docs/source.android.com/+log/master">docs/source.android.com
project log in AOSP</a></strong> for the complete list of changes to this site.
Contribute your own updates to that same project and help maintain source.android.com.</p>
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