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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. 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>

  </div>

</div>

<div class="wrap">

  <div class="landing-docs">
    <div class="col-8">
    <h3>What's New</h3>
<a href="{@docRoot}source/initializing.html">
        <h4>Initializing Improvements</h4></a>
        <p>Build environment <strong><a
        href="{@docRoot}source/initializing.html#setting-up-a-mac-os-x-build-environment">Initializing</a></strong>
        instructions now explain how to resize and unmount Mac OS sparse
        images. And the ccache section has been moved to an optional <strong><a
        href="{@docRoot}source/initializing.html#optimizing-a-build-environment">Optimizing
        a build environment</a></strong> section.</p>

<a href="{@docRoot}devices/tech/security/selinux/index.html">
        <h4>SELinux Permissive Declarations</h4></a>
        <p>SELinux <strong><a
        href="{@docRoot}devices/tech/security/selinux/customize.html">Customizing</a></strong>
        and <strong><a
        href="{@docRoot}devices/tech/security/selinux/implement.html">Implementing</a></strong>
        instructions have been updated to recommend using permissive declarations
        directly as <code>permissive_or_unconfined()</code> has been deprecated.
        Similarly, <code>BOARD_SEPOLICY_UNION</code> has been removed, so
        <code>BOARD_SEPOLICY_*</code> variables are suggested insead.</p>

<a href="{@docRoot}devices/input/diagnostics.html">
        <h4>Dumpsys Input and System Diagnostics</h4></a>
        <p>Dumpsys contents have been completely rewritten with fresh output
        examples and split into <strong><a
        href="{@docRoot}devices/input/diagnostics.html">Input Diagnostics</a></strong>
        and <strong><a href="{@docRoot}devices/tech/debug/dumpsys.html">System
        Diagnostics</a></strong>.</p>

<a href="{@docRoot}devices/bluetooth.html">
        <h4>Android 5.0 Bluetooth HCI Requirements</h4></a>
        <p><strong><a
        href="{@docRoot}devices/Android-5.0-Bluetooth-HCI-Reqs.pdf">Bluetooth
        Host Controller Interface (HCI) requirements</a></strong> to leverage
        the Bluetooth Low Energy APIs in Android 5.0 have
        been published and linked from the <strong><a
        href="{@docRoot}devices/bluetooth.html">Bluetooth</a></strong> introduction.</p>

<a href="{@docRoot}devices/tech/ota/index.html">
        <h4>OTA Updates</h4></a>
        <p>An entire suite of documentation has been added describing the <strong><a
        href="{@docRoot}devices/tech/ota/index.html">over-the-air (OTA)
        update process</a></strong> including <strong><a
        href="{@docRoot}devices/tech/ota/tools.html">available tools</a></strong>, <strong><a
        href="{@docRoot}devices/tech/ota/block.html">block-based OTAs</a></strong>, and
        <strong><a
        href="{@docRoot}devices/tech/ota/device_code.html">device-specific code</a></strong> for customizing updates.</p>

<a href="{@docRoot}devices/tech/security/verifiedboot/index.html">
        <h4>Verified Boot</h4></a>
        <p>The <strong><a
        href="{@docRoot}devices/tech/security/verifiedboot/index.html">Verified
        Boot</a></strong> section of the site has been augmented with additional
        information for <strong><a
        href="{@docRoot}devices/tech/security/verifiedboot/verified-boot.html">verifying
        boot</a></strong> and <strong><a
        href="{@docRoot}devices/tech/security/verifiedboot/dm-verity.html">implementing
        dm-verity</a></strong>.</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:left;margin:5px 10px"></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>
    </div>

  </div>

</div>