page.title=SDK Platforms Release Notes

@jd:body

<div id="qv-wrapper">
<div id="qv">


<h2>See Also</h2>
<ol>
  <li><a href="{@docRoot}about/versions/kitkat.html">KitKat
Highlights and APIs</a></li>
  <li><a href="{@docRoot}about/versions/jelly-bean.html">Jelly Bean
Highlights and APIs</a></li>
  <li><a href="{@docRoot}about/versions/android-4.0-highlights.html">Ice Cream Sandwich
Highlights and APIs</a></li>
</ol>

</div>
</div>



<p>This document provides release information about the SDK Platform packages required
for app development. If you want details about the features and APIs added in each Android
version, instead read the highlights in the <a href="{@docRoot}about/index.html">About</a>
section.</p>

<p>In order to compile your application against a particular version of Android, you must use the
<a href="{@docRoot}tools/help/sdk-manager.html">SDK Manager</a> to download and install the SDK
Platform for that release. If you want to test your application on an emulator, you must also
download at least one System Image for that Android version.</p>


<p>Each platform release includes system images that support a specific processor architecture,
such as ARM EABI, Intel x86 or MIPS. Platform releases also include a system image that contains
Google APIs. The <a href="{@docRoot}tools/help/sdk-manager.html">SDK Manager</a> lists available
platform system images under each platform version header, for example:</p>

<ul>
  <li>ARM EABI v7a System Image</li>
  <li>Intel x86 Atom System Image</li>
  <li>MIPS System Image</li>
  <li>Google APIs</li>
</ul>

<p>To determine what revisions of an Android platform you have installed, refer to the
<em>Packages</em> listing in the Android
<a href="{@docRoot}tools/help/sdk-manager.html">SDK Manager</a>.</p>

<p class="caution"><strong>Important:</strong> To download the most recent Android
system components from the Android SDK Manager, you must first update the SDK Tools to the
most recent release and restart the SDK Manager. If you do not, the latest Android system
packages may not be available for download.</p>


<h2 id="5.1">Android 5.1</h2>

<div class="toggle-content opened">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-opened.png"
class="toggle-content-img" alt="" />Revision 1</a> <em>(March 2015)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Initial release for Android 5.1 (API level 22).</p>
    <p>Also see the
    <a href="{@docRoot}about/versions/android-5.1.html">Android 5.1 APIs overview</a>.</p>
    <p>Dependencies:</p>
    <ul>
      <li>Android SDK Platform-tools r22 or higher is required.</li>
      <li>Android SDK Tools 23.0.5 or higher is required.</li>
    </ul>
  </div>

</div>



<h2 id="5.0">Android 5.0</h2>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 2</a> <em>(December 2014)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Updated layouts in the Support Library and fixed various issues.</p>
    <p>Dependencies:</p>
    <ul>
      <li>Android SDK Platform-tools r21 or higher is required.</li>
      <li>Android SDK Tools 23.0.5 or higher is required.</li>
    </ul>
  </div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 1</a> <em>(October 2014)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Initial release for Android 5.0 (API level 21).</p>
    <p>Also see the
    <a href="{@docRoot}about/versions/android-5.0.html">Android 5.0 APIs overview</a>.</p>
    <p>Dependencies:</p>
    <ul>
      <li>Android SDK Platform-tools r21 or higher is required.</li>
      <li>Android SDK Tools 23.0.5 or higher is required.</li>
    </ul>
  </div>

  <h3>Device Definitions</h3>

  <p>The platform includes the following new device definitions for use in creating
  Android Virtual Devices in the <a href="{@docRoot}tools/help/avd-manager.html">AVD Manager</a>:</p>

  <ul>
  <li>Nexus 6 (5.96", 1440 x 2560, Normal 560dpi screen) </li>
  <li>Nexus 9 (8.9", 2048 x 1536, X-Large xhdpi screen) </li>
  </ul>

</div>


<h2 id="4.4">Android 4.4W</h2>

<div class="toggle-content open">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 2</a> <em>(October 2014)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Updated the rendering library.  </p>

    <p>Dependencies:</p>
    <ul>
      <li>Android SDK Platform-tools r20 or higher is required.</li>
      <li>Android SDK Tools 23.0 or higher is required.</li>
    </ul>
  </div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 1</a> <em>(June 2014)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Initial release for Android Wear.</p>
    <p>Dependencies:</p>
    <ul>
      <li>Android SDK Platform-tools r20 or higher is required.</li>
      <li>Android SDK Tools 23.0 or higher is required.</li>
    </ul>
  </div>

  <h3>Device Definitions</h3>

  <p>The platform includes the following device definitions for use in creating Android Virtual
  Devices in the <a href="{@docRoot}tools/help/avd-manager.html">AVD Manager</a>:</p>

  <ul>
    <li>Android Wear Round (320 x 320, hdpi)</li>
    <li>Android Wear Square (320 x 320, hdpi)</li>
  </ul>
</div>

<h2 id="4.4">Android 4.4</h2>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 2</a> <em>(December 2013)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Maintenance release. The system version is 4.4.2.</p>
    <p>Also see the
    <a href="{@docRoot}about/versions/android-4.4.html">Android 4.4 APIs overview</a>.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>Android SDK Platform-tools r19 or higher is required.</dd>
      <dd>Android SDK Tools 22.3 or higher is recommended.</dd>
    </dl>

  </div>
</div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 1</a> <em>(October 2013)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Initial release. The system version is 4.4.</p>
    <p>Also see the
    <a href="{@docRoot}about/versions/android-4.4.html">Android 4.4 APIs overview</a>.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>Android SDK Platform-tools r19 or higher is required.</dd>
      <dd>Android SDK Tools 22.3 or higher is recommended.</dd>
    </dl>

  </div>
</div>



<h3 id="gsi-4.4">Google APIs System Image</h3>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 4</a> <em>(March 2014)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>This release includes
    <a href="{@docRoot}google/play-services/index.html">Google Play services</a> version 4.3,
    allowing you to test your application in an emulator using the latest Google Play services.</p>

  </div>
</div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 3</a> <em>(February 2014)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>This release includes
    <a href="{@docRoot}google/play-services/index.html">Google Play services</a> version 4.2.42,
    allowing you to test your application in an emulator using the latest Google Play services.</p>

  </div>
</div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 2</a> <em>(December 2013)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>This release includes
    <a href="{@docRoot}google/play-services/index.html">Google Play services</a> version 4.0.33.</p>

  </div>
</div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 1</a> <em>(October 2013)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Initial release. This release includes
    <a href="{@docRoot}google/play-services/index.html">Google Play services</a> version 4.0.30.
    </p>

  </div>
</div>



<h2 id="4.3">Android 4.3</h2>


<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 2</a> <em>(August 2013)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Maintenance update. The system version is 4.3.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>Android SDK Platform-tools r18 or higher is required.</dd>
      <dd>Android SDK Tools 22.0.4 or higher is recommended.</dd>
    </dl>

  </div>
</div>

<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 1</a> <em>(July 2013)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Initial release. The system version is 4.3.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>Android SDK Platform-tools r18 or higher is required.</dd>
      <dd>Android SDK Tools 22.0.4 or higher is recommended.</dd>
    </dl>

  </div>
</div>

<h3 id="gsi-4.3">Google APIs System Image</h3>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 3</a> <em>(September 2013)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Maintenance update. This release includes
    <a href="{@docRoot}google/play-services/index.html">Google Play services</a> version 3.2.65.
    </p>

  </div>
</div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 2</a> <em>(August 2013)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Maintenance update. This release includes
    <a href="{@docRoot}google/play-services/index.html">Google Play services</a> version 3.2.25.
    </p>

  </div>
</div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 1</a> <em>(July 2013)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Initial release. This release includes
    <a href="{@docRoot}google/play-services/index.html">Google Play services</a> version 3.1.58.</p>

  </div>
</div>




<h2 id="4.2">Android 4.2</h2>


<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 2</a> <em>(February 2013)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Maintenance update. The system version is 4.2.2.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>SDK Tools r21 or higher is required.</dd>
    </dl>

  </div>
</div>

<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 1</a> <em>(November 2012)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Initial release. The system version is 4.2.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>SDK Tools r20 or higher is required.</dd>
    </dl>

  </div>
</div>

<h3>Device Definitions</h3>

<p>The platform includes the following device definitions for use in creating Android Virtual
Devices in the <a href="{@docRoot}tools/help/avd-manager.html">AVD Manager</a>:</p>

<ul>
  <li>
    Nexus 7 (7.3", 800 x 1280, Large tvdpi screen)
  </li>
  <li>
    Galaxy Nexus (4.7", 720 x 1280, Normal xhdpi screen)
  </li>
  <li>
    Nexus S (4.0", 480 x 800, Normal hdpi screen)
  </li>
  <li>
    Nexus One (3.7", 480 x 720, Normal hdpi screen)
  </li>
  <li>
    10.1" WXGA Tablet (1280 x 800, X-Large mdpi screen)
  </li>
  <li>
    7.0" WSVGA Tablet (1024 x 600, Large mdpi screen)
  </li>
  <li>
    5.4" FWVGA (480 x 854, Large mdpi screen)
  </li>
  <li>
    5.1" WVGA (480 x 800, Large mdpi screen)
  </li>
  <li>
    4.7" WXGA (1280 x 720, Normal xhdpi screen)
  </li>
  <li>
    4.65" 720p (720 x 1280, Normal xhdpi screen)
  </li>
  <li>
    4.0" WVGA (480 x 800, Normal hdpi screen)
  </li>
  <li>
    3.7" WVGA (480 x 800, Normal hdpi screen)
  </li>
  <li>
    3.7" FWVGA slider (480 x 854, Normal hdpi screen)
  </li>
  <li>
    3.4" WQVGA (240 x 432, Normal ldpi screen)
  </li>
  <li>
    3.3" WQVGA (240 x 400, Normal ldpi screen)
  </li>
  <li>
    3.2" QVGA ADP2 (320 x 480, Normal mdpi screen)
  </li>
  <li>
    3.2" HVGA slider ADP1 (320 x 480, Normal mdpi screen)
  </li>
  <li>
    2.7" QVGA slider (240 x 320, Small ldpi screen)
  </li>
  <li>
    2.7" QVGA (240 x 320, Small ldpi screen)
  </li>
</ul>



<h2 id="4.1">Android 4.1</h2>


<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 3</a> <em>(October 2012)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Maintenance update. The system version is 4.1.2.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>SDK Tools r20 or higher is required.</dd>
    </dl>

  </div>
</div>

<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 2</a> <em>(July 2012)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Maintenance update. The system version is 4.1.1.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>SDK Tools r20 or higher is required.</dd>
    </dl>

  </div>
</div>

<div class="toggle-content closed" >

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 1</a> <em>(June 2012)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Initial release. The system version is 4.1.0.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>SDK Tools r20 or higher is required.</dd>
    </dl>

  </div>
</div>

<h3>Emulator Skins</h3>

<p>The downloadable platform includes the following emulator skins:</p>

<ul>
  <li>
    QVGA (240x320, low density, small screen)
  </li>
  <li>
    WQVGA400 (240x400, low density, normal screen)
  </li>
  <li>
    WQVGA432 (240x432, low density, normal screen)
  </li>
  <li>
    HVGA (320x480, medium density, normal screen)
  </li>
  <li>
    WVGA800 (480x800, high density, normal screen)
  </li>
  <li>
    WVGA854 (480x854 high density, normal screen)
  </li>
  <li>
    WXGA720 (1280x720, extra-high density, normal screen)
  </li>
  <li>
    WSVGA (1024x600, medium density, large screen)
  </li>
  <li>
    WXGA800-7in (1280x800, high density, large screen) <span class="new">new</span>
  </li>
  <li>
    WXGA800 (1280x800, medium density, xlarge screen)
  </li>
</ul>

<p>To test your application on an emulator that represents the <a
href="http://play.google.com/nexus7">Nexus 7</a> tablet device, you can create an AVD with
the new WXGA800-7in skin. For best performance, make sure to enable <a
href="{@docRoot}tools/devices/emulator.html#accel-graphics">graphics acceleration</a> in the
emulator configuration.</p>














<h2 id="4.0.3">Android 4.0.3</h2>


<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 3</a> <em>(March 2012)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Maintenance update. The system version is 4.0.4.</p>
    <p class="note"><strong>Note:</strong> This system image includes support for emulator
hardware graphics acceleration when used with SDK Tools r17 or higher.
(<a href="{@docRoot}tools/devices/emulator.html#accel-graphics">more info</a>)</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>SDK Tools r17 or higher is required.</dd>
    </dl>

  </div>
</div>

<div class="toggle-content closed" >

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 2</a> <em>(January 2012)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Maintenance update. The system version is 4.0.3.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>SDK Tools r14 or higher is required.</dd>
    </dl>

  </div>
</div>

<div class="toggle-content closed" >

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Revision 1</a> <em>(December 2011)</em>
  </p>

  <div class="toggle-content-toggleme">

    <p>Initial release. The system version is 4.0.3.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>SDK Tools r14 or higher is required.</dd>
    </dl>

  </div>
</div>

<h3>Emulator Skins</h3>

<p>The downloadable platform includes the following emulator skins:</p>

<ul>
  <li>
    QVGA (240x320, low density, small screen)
  </li>
  <li>
    WQVGA400 (240x400, low density, normal screen)
  </li>
  <li>
    WQVGA432 (240x432, low density, normal screen)
  </li>
  <li>
    HVGA (320x480, medium density, normal screen)
  </li>
  <li>
    WVGA800 (480x800, high density, normal screen)
  </li>
  <li>
    WVGA854 (480x854 high density, normal screen)
  </li>
  <li>
    WXGA720 (1280x720, extra-high density, normal screen)
  </li>
  <li>
    WSVGA (1024x600, medium density, large screen)
  </li>
  <li>
    WXGA (1280x800, medium density, xlarge screen)
  </li>
</ul>
















<h2 id="4.0">Android 4.0</h2>


<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android 4.0, Revision 2</a> <em>(December 2011)</em>
  </p>

  <div class="toggle-content-toggleme">
    <p>Maintenance update. The system version is 4.0.2.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>SDK Tools r14 or higher is required.</dd>
    </dl>
  </div>
</div>

<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android 4.0, Revision 1</a> <em>(October 2011)</em>
  </p>

  <div class="toggle-content-toggleme">
    <p>Initial release. The system version is 4.0.1.</p>
    <dl>
      <dt>Dependencies:</dt>
      <dd>SDK Tools r14 or higher is required.</dd>
    </dl>
  </div>
</div>


<h3>Emulator Skins</h3>

<p>The downloadable platform includes the following emulator skins:</p>

<ul>
  <li>
    QVGA (240x320, low density, small screen)
  </li>
  <li>
    WQVGA400 (240x400, low density, normal screen)
  </li>
  <li>
    WQVGA432 (240x432, low density, normal screen)
  </li>
  <li>
    HVGA (320x480, medium density, normal screen)
  </li>
  <li>
    WVGA800 (480x800, high density, normal screen)
  </li>
  <li>
    WVGA854 (480x854 high density, normal screen)
  </li>
  <li>
    WXGA720 (1280x720, extra-high density, normal screen) <span class="new">new</span>
  </li>
  <li>
    WSVGA (1024x600, medium density, large screen) <span class="new">new</span>
  </li>
  <li>
    WXGA (1280x800, medium density, xlarge screen)
  </li>
</ul>

<p>To test your application on an emulator that represents the latest Android device, you can create
an AVD with the new WXGA720 skin (it's an xhdpi, normal screen device). Note that the emulator
currently doesn't support the new on-screen navigation bar for devices without hardware navigation
buttons, so when using this skin, you must use keyboard keys <em>Home</em> for the Home button,
<em>ESC</em> for the Back button, and <em>F2</em> or <em>Page-up</em> for the Menu button.</p>

<p>However, due to performance issues in the emulator when running high-resolution screens such as
the one for the WXGA720 skin, we recommend that you primarily use the traditional WVGA800 skin
(hdpi, normal screen) to test your application.</p>













<h2 id="3.2">Android 3.2</h2>



<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android 3.2, Revision 1</a> <em>(July 2011)</em>
  </p>

  <div class="toggle-content-toggleme">

<dl>
<dt>Initial release. SDK Tools r12 or higher is recommended.</dt>
</dl>

  </div>
</div>




<h3>Emulator Skins</h3>

<p>The downloadable platform includes the following emulator skin:</p>

<ul>
  <li>
    WXGA (1280x800, medium density, xlarge screen)
  </li>
</ul>

<p>For more information about how to develop an application that displays
and functions properly on all Android-powered devices, see <a
href="{@docRoot}guide/practices/screens_support.html">Supporting Multiple
Screens</a>.</p>


















<h2 id="3.1">Android 3.1</h2>


<div class="toggle-content closed">

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android 3.1, Revision 3</a> <em>(July 2011)</em>
</p>

<div class="toggle-content-toggleme">

<dl>
<dt>Dependencies:</dt>
<dd>
<p>Requires <a href="{@docRoot}tools/sdk/tools-notes.html">SDK Tools r12</a> or
higher.</p>
</dd>
<dt>Notes:</dt>
<dd>
<p>Improvements to the platform's rendering library to support the visual layout editor in the ADT
Eclipse plugin. This revision allows for more drawing features in ADT and fixes several
bugs in the previous rendering library. It also unlocks several editor features that were added in
ADT 12.</p>
</dd>
</dl>

</div>
</div>


<div class="toggle-content closed" >

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android 3.1, Revision 2</a> <em>(May 2011)</em>
</p>

<div class="toggle-content-toggleme">

<dl>
<dt>Dependencies:</dt>
<dd>
<p>Requires <a href="{@docRoot}tools/sdk/tools-notes.html">SDK Tools r11</a> or
higher.</p>
</dd>
<dt>Notes:</dt>
<dd>
<p>Fixes an issue with the visual layout editor rendering library that prevented Android 3.1 from
running in ADT.</p>
</dd>
</dl>

</div>
</div>


<div class="toggle-content closed">

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android 3.1, Revision 1</a> <em>(May 2011)</em>
</p>

<div class="toggle-content-toggleme">

<dl>
<dt>Dependencies:</dt>
<dd>
<p>Requires <a href="{@docRoot}tools/sdk/tools-notes.html">SDK Tools r11</a> or
higher.</p>
</dd>
</dl>

</div>
</div>


<h3>Emulator Skins</h3>

<p>The downloadable platform includes the following emulator skin:</p>

<ul>
  <li>
    WXGA (1280x800, medium density, xlarge screen)
  </li>
</ul>

<p>For more information about how to develop an application that displays
and functions properly on all Android-powered devices, see <a
href="{@docRoot}guide/practices/screens_support.html">Supporting Multiple
Screens</a>.</p>











<h2 id="3.0">Android 3.0</h2>


<div class="toggle-content closed" >

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android 3.0, Revision 2</a> <em>(July 2011)</em>
</p>

<div class="toggle-content-toggleme">

<dl>
<dt>Dependencies:</dt>
<dd>
<p>Requires <a href="{@docRoot}tools/sdk/tools-notes.html">SDK Tools r12</a> or
higher.</p>
</dd>
<dt>Notes:</dt>
<dd>
<p>Improvements to the platform's rendering library to support the visual layout editor in the ADT
Eclipse plugin. This revision allows for more drawing features in ADT and fixes several
bugs in the previous rendering library. It also unlocks several editor features that were added in
ADT 12.</p>
</dd>
</dl>

</div>
</div>

<div class="toggle-content closed">

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png" class="toggle-content-img"
       alt="" />Android 3.0, Revision 1</a> <em>(February 2011)</em>
</p>

<div class="toggle-content-toggleme">

<dl>
<dt>Dependencies:</dt>
<dd>
<p>Requires <a href="{@docRoot}tools/sdk/tools-notes.html">SDK Tools r10</a> or higher.</p>
</dd>
</dl>

</div>
</div>



<h3>Emulator Skins</h3>

<p>The downloadable platform includes the following emulator skin:</p>

<ul>
  <li>
    WXGA (1280x800, medium density, xlarge screen)
  </li>
</ul>


















<h2 id="2.3.4">Android 2.3.4</h2>


<div class="toggle-content closed" >

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png" class="toggle-content-img"
       alt="" />Android 2.3.4, Revision 1</a> <em>(May 2011)</em>
</p>

  <div class="toggle-content-toggleme">
    <dl>
      <dt>Dependencies:</dt>
      <dd>
        <p>Requires SDK Tools r11 or higher.</p>
      </dd>
    </dl>
  </div>
</div>


<h3>Emulator Skins</h3>

<p>The downloadable platform includes a set of emulator skins that you can use
for modeling your application in different screen sizes and resolutions. The
emulator skins are:</p>

<ul>
  <li>
    QVGA (240x320, low density, small screen)
  </li>
  <li>
    WQVGA400 (240x400, low density, normal screen)
  </li>
  <li>
    WQVGA432 (240x432, low density, normal screen)
  </li>
  <li>
    HVGA (320x480, medium density, normal screen)
  </li>
  <li>
    WVGA800 (480x800, high density, normal screen)
  </li>
  <li>
    WVGA854 (480x854 high density, normal screen)
  </li>
</ul>













<h2 id="2.3.3">Android 2.3.3</h2>


<div class="toggle-content closed" >

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android 2.3.3, Revision 2</a> <em>(July 2011)</em>
</p>

<div class="toggle-content-toggleme">

<dl>
<dt>Dependencies:</dt>
<dd>
<p>Requires <a href="{@docRoot}tools/sdk/tools-notes.html">SDK Tools r12</a> or
higher.</p>
</dd>
<dt>Notes:</dt>
<dd>
<p>Improvements to the platform's rendering library to support the visual layout editor in the ADT
Eclipse plugin. This revision allows for more drawing features in ADT and fixes several
bugs in the previous rendering library. It also unlocks several editor features that were added in
ADT 12.</p>
</dd>
</dl>

</div>
</div>

<div class="toggle-content closed" >

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android 2.3.3, Revision 1</a> <em>(February 2011)</em>
</p>

<div class="toggle-content-toggleme">
<dl>
<dt>Dependencies:</dt>
<dd>
<p>Requires SDK Tools r9 or higher.</p>
</dd>
</dl>

</div>
</div>


<h3>Emulator Skins</h3>

<p>The downloadable platform includes a set of emulator skins that you can use
for modeling your application in different screen sizes and resolutions. The
emulator skins are:</p>

<ul>
  <li>
    QVGA (240x320, low density, small screen)
  </li>
  <li>
    WQVGA400 (240x400, low density, normal screen)
  </li>
  <li>
    WQVGA432 (240x432, low density, normal screen)
  </li>
  <li>
    HVGA (320x480, medium density, normal screen)
  </li>
  <li>
    WVGA800 (480x800, high density, normal screen)
  </li>
  <li>
    WVGA854 (480x854 high density, normal screen)
  </li>
</ul>












<h2 id="2.3">Android 2.3</h2>


<div class="toggle-content closed" >

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png" class="toggle-content-img"
       alt="" />Android 2.3, Revision 1</a> <em>(December 2010)</em>
</p>

  <div class="toggle-content-toggleme">
    <dl>
      <dt>Dependencies:</dt>
      <dd>
      <p>Requires SDK Tools r8 or higher.</p>
      </dd>
    </dl>
  </div>
</div>


<h3>Emulator Skins</h3>

<p>The downloadable platform includes a set of emulator skins that you can use
for modeling your application in different screen sizes and resolutions. The
emulator skins are:</p>

<ul>
  <li>
    QVGA (240x320, low density, small screen)
  </li>
  <li>
    WQVGA400 (240x400, low density, normal screen)
  </li>
  <li>
    WQVGA432 (240x432, low density, normal screen)
  </li>
  <li>
    HVGA (320x480, medium density, normal screen)
  </li>
  <li>
    WVGA800 (480x800, high density, normal screen)
  </li>
  <li>
    WVGA854 (480x854 high density, normal screen)
  </li>
</ul>









<h2 id="2.2">Android 2.2</h2>


<div class="toggle-content closed" >

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android {@sdkPlatformVersion}, Revision 3</a> <em>(July 2011)</em>
</p>

<div class="toggle-content-toggleme">

<dl>
<dt>Dependencies:</dt>
<dd>
<p>Requires <a href="{@docRoot}tools/sdk/tools-notes.html">SDK Tools r12</a> or
higher.</p>
</dd>
<dt>Notes:</dt>
<dd>
<p>Improvements to the platform's rendering library to support the visual layout editor in the ADT
Eclipse plugin. This revision allows for more drawing features in ADT and fixes several
bugs in the previous rendering library. It also unlocks several editor features that were added in
ADT 12.</p>
</dd>
</dl>

</div>
</div>

<div class="toggle-content closed" >

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android {@sdkPlatformVersion}, Revision 2</a> <em>(July 2010)</em>
</p>

<div class="toggle-content-toggleme">
<dt>Dependencies:</dt>
<dd>
<p>Requires SDK Tools r6 or higher.</p>
</dd>

<dt>System Image:</dt>
<dd>
<ul>
<li>Adds default Search Widget.</li>
<li>Includes proper provisioning for the platform's Backup Manager. For more information about how
to use the Backup Manager, see <a href="{@docRoot}guide/topics/data/backup.html">Data
Backup</a>.</li>
<li>Updates the Android 2.2 system image to FRF91.</li>
</ul>
</dd>

</dl>
 </div>
</div>

<div class="toggle-content closed">

<p><a href="#" onclick="return toggleContent(this)">
  <img src="{@docRoot}assets/images/triangle-closed.png"
class="toggle-content-img" alt="" />Android {@sdkPlatformVersion}, Revision 1</a> <em>(May 2010)</em></p>

<div class="toggle-content-toggleme">
<dl>
<dt>Dependencies:</dt>
<dd>
<p>Requires SDK Tools r6 or higher.</p>
</dd>

<dt>Tools:</dt>
<dd>
<p>Adds support for building with Android library projects. See <a href="{@docRoot}tools/sdk/tools-notes.html">SDK
Tools, r6</a> for information.</p>
</dd>

</dl>
 </div>
</div>


<h3>Emulator Skins</h3>

<p>The downloadable platform includes a set of emulator skins that you can use
for modeling your application in different screen sizes and resolutions. The
emulator skins are:</p>

<ul>
  <li>
    QVGA (240x320, low density, small screen)
  </li>
  <li>
    WQVGA (240x400, low density, normal screen)
  </li>
  <li>
    FWQVGA (240x432, low density, normal screen)
  </li>
  <li>
    HVGA (320x480, medium density, normal screen)
  </li>
  <li>
    WVGA800 (480x800, high density, normal screen)
  </li>
  <li>
    WVGA854 (480x854 high density, normal screen)
  </li>
</ul>