page.title=Platforms
@jd:body

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


<h2>See Also</h2>
<ol>
  <li><a href="{@docRoot}about/versions/android-4.0-highlights.html">Ice Cream Sandwich
Highlights and APIs</a></li>
  <li><a href="{@docRoot}about/versions/android-3.0-highlights.html">Honeycomb
Highlights and APIs</a></li>
  <li><a href="{@docRoot}about/versions/android-2.3-highlights.html">Gingerbread
Highlights and APIs</a></li>
</ol>

</div>
</div>



<p>To develop an Android app, you must install at least one Android platform from the SDK Manager
against which you can compile your app. Often, any given version of the Android will be revised
with bug fixes or other changes, as denoted by the "revision" number. Below, you'll find the
release notes for each version of the platform and the subsequent revisions to the platform
version.</p>

<p>To determine what revision of an Android platform you
have installed, refer to the "Installed Packages" listing in the Android SDK Manager.</p>








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


<p class="caution"><strong>Important:</strong> To download the new Android
4.0.x system components from the Android SDK Manager, you must first update the
SDK tools to revision 14 or later and restart the Android SDK Manager. If you do not,
the Android 4.0.x system components will not be available for download.</p>

<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 3</a> <em>(March 2012)</em>
  </a></p>

  <div class="toggle-content-toggleme" style="padding-left:2em;">

    <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>
  </a></p>

  <div class="toggle-content-toggleme" style="padding-left:2em;">

    <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>
  </a></p>

  <div class="toggle-content-toggleme" style="padding-left:2em;">

    <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>

<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="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>
  </a></p>

  <div class="toggle-content-toggleme" style="padding-left:2em;">
    <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>
  </a></p>

  <div class="toggle-content-toggleme" style="padding-left:2em;">
    <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>
  </a></p>

  <div class="toggle-content-toggleme" style="padding-left:2em;">

<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>
</a></p>

<div class="toggle-content-toggleme" style="padding-left:2em;">

<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>
</a></p>

<div class="toggle-content-toggleme" style="padding-left:2em;">

<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>
</a></p>

<div class="toggle-content-toggleme" style="padding-left:2em;">

<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>
</a></p>

<div class="toggle-content-toggleme" style="padding-left:2em;">

<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>
</a></p>

<div class="toggle-content-toggleme" style="padding-left:2em;">
    
<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>



<p>The sections below provide notes about successive releases of
the Android 2.3.4 platform component for the Android SDK, as denoted by
revision number. To determine what revision(s) of the Android
2.3.4 platforms are installed in your SDK environment, refer to
the "Installed Packages" listing in the Android SDK and AVD Manager.</p>

<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>
</a></p>

  <div class="toggle-content-toggleme" style="padding-left:2em;">
    <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>
</a></p>

<div class="toggle-content-toggleme" style="padding-left:2em;">

<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>
</a></p>

<div class="toggle-content-toggleme" style="padding-left:2em;">
<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>



<p>The sections below provide notes about successive releases of
the Android 2.3 platform component for the Android SDK, as denoted by
revision number. To determine what revision(s) of the Android
2.3 platforms are installed in your SDK environment, refer to
the "Installed Packages" listing in the Android SDK and AVD Manager.</p>


<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>
</a></p>

  <div class="toggle-content-toggleme" style="padding-left:2em;">
    <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>
</a></p>

<div class="toggle-content-toggleme" style="padding-left:2em;">

<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>
</a></p>

<div class="toggle-content-toggleme" style="padding-left:2em;">
<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>
</a></p>

<div class="toggle-content-toggleme" style="padding-left:2em;">
<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="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>