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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. 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.
</p>
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<h3>What's New</h3>
<a href="{@docRoot}source/build-numbers.html">
<h4>Android 4.4.4 released</h4></a>
<p>Builds for Android 4.4.4 have been released. See the <strong><a
href="{@docRoot}source/build-numbers.html#source-code-tags-and-builds">Source
Code Tags and Builds</a></strong> table on <strong>Codenames, Tags, and Build
Numbers</strong> for the new builds, tags, and devices supported.</p>
<a href="{@docRoot}compatibility/downloads.html">
<h4>Android 4.4 CTS packages updated</h4></a>
<p>Revision 3 of the Android 4.4 Compatibility Test Suite (CTS) and
Android 4.4 CTS Verifier have been added to Compatibility
<strong><a
href="{@docRoot}compatibility/downloads.html">Downloads</a></strong>. Packages
for x86 architectures are included for the first time.</p>
<img border="0" src="images/Android_Robot_100.png" alt="Android Partner icon" style="display:inline;float:right;margin:5px 10px">
<a href="{@docRoot}devices/tech/dalvik/art.html">
<h4>ART introduction completely revised</h4></a>
<p><strong><a
href="{@docRoot}devices/tech/dalvik/art.html">Introducing ART</a></strong> has been
rewritten to reflect forthcoming changes and prepare developers and
manufacturers for the runtime's adoption.</p>
<a href="{@docRoot}source/brands.html">
<h4>Brand guidelines published</h4></a>
<p>Manufacturers have their own set of <strong><a
href="{@docRoot}source/brands.html">guidelines for Android brand use</a></strong>.</p>
<a href="{@docRoot}devices/graphics/architecture.html">
<h4>Graphics architecture document published</h4></a>
<p>Android engineering describes the system-level <strong><a
href="{@docRoot}devices/graphics/architecture.html">Graphics
Architecture</a></strong> in great detail.</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
repository</a></strong> to make your changes available to everyone else in
the Android ecosystem.</p>
<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>
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