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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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  <div class="landing-docs">
    <div class="col-8">
    <h3>What's New</h3>
<a href="{@docRoot}compatibility/cts/verifier.html">
        <h4>Audio Framework and Near Ultrasound CTS Tests</h4></a>
        <p>Find comprehensive guides for testing the <strong><a
        href="{@docRoot}compatibility/cts/audio-framework.html">Audio
        Framework</a></strong> and <strong><a
        href="{@docRoot}compatibility/cts/near-ultrasound.html">Near
        Ultrasound</a></strong> capabilities of Android devices within the
        Compatibility Test Suite <strong><a
        href="{@docRoot}compatibility/cts/verifier.html">CTS Verifier</a></strong> section.</p>

<a href="{@docRoot}devices/tech/debug/native-memory.html">
        <h4>Malloc Debugging and Native Memory Tracking</h4></a>
        <p>New documents on <strong><a
        href="https://android.googlesource.com/platform/bionic/+/master/libc/malloc_debug/README.md">malloc
        debugging</a></strong> and <strong><a
        href="https://android.googlesource.com/platform/bionic/+/master/libc/malloc_debug/README_api.md">native
        memory tracking using libc Callbacks</a></strong> have been published to the
        Android Open Source Project (AOSP) and linked from <strong><a
        href="{@docRoot}devices/tech/debug/native-memory.html">Debugging Native Memory
        Use</a></strong>.</p>

<a href="{@docRoot}security/trusty/index.html">
        <h4>Trusty Build Instructions</h4></a>
        <p>Links and commands have been added for <strong><a
        href="{@docRoot}security/trusty/index.html#downloading_building">downloading
        and building</a></strong> the Trusty Trusted Execution Environment (TEE).</p>

<a href="{@docRoot}security/bulletin/index.html">
        <h4>May Android Security Bulletin</h4></a>
        <p>The <strong><a
        href="{@docRoot}security/bulletin/2016-05-01.html">May 2016 Android Security
        Bulletin</a></strong> has been published along with updates to the <strong><a
        href="{@docRoot}security/overview/updates-resources.html#severity">Android
        Security severity ratings</a></strong>. In addition, new <strong><a
        href="{@docRoot}source/build-numbers.html#source-code-tags-and-builds">build
        numbers</a></strong> have been published for Nexus 5, Nexus 6, Nexus 7,
        Nexus 9, Nexus 5X, Nexus 6P, and Nexus Player running Android 6.0 to
        support the May Android security release.</p>

<a href="{@docRoot}compatibility/cts/downloads.html">
        <h4>CTS Updated to 6.0R6, 5.1R7 and 5.0R6</h4></a>
        <p>New versions of the Compatibility Test Suite (CTS) have been
        released for Android 6.0, 5.1, and 5.0. In additon, the <strong><a
        href="{@docRoot}compatibility/cts/downloads.html">Downloads</a></strong> page has been
        moved under <strong><a
        href="{@docRoot}compatibility/cts/index.html">CTS</a></strong> since links to
        the Android Compatibility Definition Document (CDD) have been moved to a
        dedicated <strong><a href="{@docRoot}compatibility/cdd.html">Compatibility
        Definition Document</a></strong> page.</p>

<a href="{@docRoot}compatibility/cdd.html">
        <h4>CDD as Web Page, Older Versions Available</h4></a>
        <p>The Android Compatibility Definition Document (CDD) is now published
        as a <strong><a href="{@docRoot}compatibility/android-cdd.html">web
        page</a></strong> for easy access, and all older versions of the CDD and
        associated version strings are now listed on a central <strong><a
        href="{@docRoot}compatibility/cdd.html">Compatibility Definition Document</a>
        </strong> page.</p>
    </div>

    <div class="col-8">
      <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}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 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 improvements to the content or identify errors. In addition,
        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>
    </div>

  </div>

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