docs/html/sdk/compatibility-library.jd - platform/frameworks/base - Git at Google

 page.title=Support Package

 @jd:body

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

 <h2>In this document</h2>
 <ol>
   <li><a href="#Notes">Revisions</a></li>
   <li><a href="#Downloading">Downloading the Support Package</a></li>
   <li><a href="#SettingUp">Setting Up a Project to Use a Library</a></li>
   <li><a href="#Using">Using the v4 Library APIs</a></li>
   <li><a href="#Docs">Reference Docs</a></li>
   <li><a href="#Samples">Samples</a></li>
 </ol>

 <h2>See also</h2>
 <ol>
   <li><a
 href="{@docRoot}guide/practices/optimizing-for-3.0.html">Optimizing Apps for Android 3.0</a></li>
   <li><a href="http://code.google.com/p/iosched/">Google I/O App source code</a></li>
 </ol>

 </div>
 </div>

 <p><em>Minimum API level supported:</em> <b>4</b></p>

 <p>The Support Package includes static "support libraries" that you can add to your Android
 application in order to use APIs that are either not available for older platform versions or that
 offer "utility" APIs that aren't a part of the framework APIs. The goal is to simplify your
 development by offering more APIs that you can bundle with your application so you can
 worry less about platform versions.</p>

 <p class="note"><strong>Note:</strong> The Support Package includes more than one support
 library. Each one has a different <em>minimum API level</em>. For example, one library requires API
 level 4 or higher, while another requires API level 13 or higher (v13 is a superset of v4 and includes additional
 support classes to work with v13 APIs). The minimum version is indicated
 by the directory name, such as {@code v4/} and {@code v13/}.</p>


 <h2 id="Notes">Revisions</h2>

 <p>The sections below provide notes about successive releases of
 the Support Package, as denoted by revision number.</p>


 <div class="toggle-content open">

   <p><a href="#" onclick="return toggleContent(this)">
     <img src="{@docRoot}assets/images/triangle-opened.png" class="toggle-content-img" />
     Support Package, revision 4 (October 2011)
   </a></p>

   <div class="toggle-content-toggleme" style="padding-left:2em">
     <dl>
       <dt>Changes for v4 support library:</dt>
       <dd>
         <ul>
           <li>Support for Accessiblity APIs:
             <ul>
               <li>Added <code>AccessibilityDelegateCompat</code> to support
               {@link android.view.View.AccessibilityDelegate}.</li>

               <li>Added <code>AccessibilityEventCompat</code> to support
               {@link android.view.accessibility.AccessibilityEvent}.</li>

               <li>Added <code>AccessibilityManagerCompat</code> to support
               {@link android.view.accessibility.AccessibilityManager}.</li>

               <li>Added <code>AccessibilityNodeInfoCompat</code> to support
               {@link android.view.accessibility.AccessibilityNodeInfo}.</li>

               <li>Added <code>AccessibilityRecordCompat</code> to support
               {@link android.view.accessibility.AccessibilityRecord}.</li>

               <li>Added <code>AccessibilityServiceInfoCompat</code> to support
               {@link android.accessibilityservice.AccessibilityServiceInfo}.</li>

               <li>Added <code>ViewGroupCompat</code>
               to support accessibility features in {@link android.view.ViewGroup}.
               </li>

               <li>Modified <code>ViewCompat</code>
               to support accessibility features in {@link android.view.View}.</li>
             </ul>
           </li>

           <li>Added <code>EdgeEffectCompat</code> to
           support {@link android.widget.EdgeEffect}.</li>

           <li>Added <code>LocalBroadcastManager</code> to allow applications to easily
             register for and receive intents within a single application without
             broadcasting them globally.</li>

           <li>Added support in <code>ViewCompat</code> to check for and set overscroll
           modes for {@link android.view.View}s on Android 2.3 and later.</li>
           <li>Changes to Fragment APIs:
             <ul>
               <li>Added new APIs to control the visibility of new menus.</li>
               <li>Added custom animation APIs.</li>
               <li>Added APIs in <code>FragmentActivity</code> to retain custom,
               non-configuration instance data.</li>
               <li>Various bug fixes.</li>
             </ul>
           </li>
           <li>Changes to <code>ViewPager</code>:
             <ul>
               <li>Added support for margins between pages.
               An optional {@link android.graphics.drawable.Drawable} can be provided
               to fill the margins.</li>
               <li>Added support for {@link android.widget.EdgeEffect}.</li>
               <li>Added support for keyboard navigation</li>
               <li>Added support to control how many pages are kept to either side
               of the current page.</li>
               <li>Improved touch physics.</li>
             </ul>
           </li>

           <li>Fixed a {@link android.content.Loader} bug that caused issues in
           canceling {@link android.os.AsyncTask}s when running on Froyo and older
           versions of the platform. The support
           code now uses its own version of {@link android.os.AsyncTask} to keep the same
           behavior on all platform versions.</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" />
     Compatibility Package, revision 3 (July 2011)
   </a></p>

   <div class="toggle-content-toggleme" style="padding-left:2em">
     <dl>
       <dt>Changes for v4 support library:</dt>
       <dd>
         <ul>
           <li>Adds support for {@link android.app.Fragment.SavedState}</li>
           <li>Adds {@code MotionEventCompat} to support newer {@link
 android.view.MotionEvent} APIs</li>
           <li>Adds {@code VelocityTrackerCompat} to support a newer {@link
 android.view.VelocityTracker} APIs</li>
           <li>Adds {@code ViewConfigurationCompat} to support a newer {@link
 android.view.ViewConfiguration} APIs</li>
           <li>All new APIs (available only in the support library) that allow you to create UIs
 with horizontal paging, allowing users to swipe left and right between content views. Classes to
 support this include:
             <ul>
               <li>{@code ViewPager}: A {@link android.view.ViewGroup} that manages the
 layout for the child views, which the user can swipe between.</li>
               <li>{@code PagerAdapter}: An adapter that populates the {@code ViewPager} with the
 views that represent each page.</li>
               <li>{@code FragmentPagerAdapter}: An extension of {@code PagerAdapter} for flipping
 between fragments.</li>
               <li>{@code FragmentStatePagerAdapter}: An extension of {@code PagerAdapter} for
 flipping between fragments that uses the library's support for {@link
 android.app.Fragment.SavedState}.</li>
             </ul>
           </li>
         </ul>
       </dd>
       <dt>New v13 support library:</dt>
       <dd>
         <ul>
           <li>Includes the {@code FragmentPagerAdapter} and {@code FragmentStatePagerAdapter}
 to support the horizontal paging.
           <p>These are exactly the same as the APIs added to the v4 support library, but rely on
 other platform components in Android 3.2. Use this library instead of v4 if you're developing for
 Android 3.2 and higher (all other APIs in the v4 library are already available with API level
 13).</p>
           </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" />
     Compatibility Package, revision 2 (May 2011)
   </a></p>

   <div class="toggle-content-toggleme" style="padding-left:2em">
     <dl>
     <dt>Changes for v4 library:</dt>
     <dd>
       <ul>
         <li>Support for fragment animations</li>
         <li>Fix {@code Fragment.onActivityResult()} bug</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" />
     Compatibility Package, revision 1 (March 2011)
   </a></p>

   <div class="toggle-content-toggleme" style="padding-left:2em">
       <p>Initial release with the v4 library.</p>
   </div>

 </div>


 <h2 id="Downloading">Downloading the Support Package</h2>

 <p>The Support Package is provided as a downloadable package from the Android SDK and AVD
 Manager. To install:</p>

 <ol>
   <li>Launch the SDK and AVD Manager.
     <p>From Eclipse, you can select <strong>Window</strong>
 &gt; <strong>Android SDK and AVD Manager</strong>. Or, launch {@code SDK Manager.exe} from
 the {@code &lt;sdk&gt;/} directory (on Windows only) or {@code android} from the {@code
 &lt;sdk&gt;/tools/} directory.</p></li>
   <li>Expand the Android Repository, check <strong>Android Support package</strong>
 and click <strong>Install selected</strong>.</li>
   <li>Proceed to install the package.</li>
 </ol>

 <p>When done, all files (including source code, samples, and the {@code .jar} files) are saved
 into the <code>&lt;sdk&gt;/extras/android/support/</code> directory. This directory contains
 each of the different support libraries, such as the library for API level 4 and up and the library
 for API level 13 and up, each named with the respective version (such as {@code v4/}).</p>


 <h2 id="SettingUp">Setting Up a Project to Use a Library</h2>

 <p>To add one of the libraries to your Android project:</p>
 <ol>
   <li>In your Android project, create a directory named {@code libs} at the root of your
 project (next to {@code src/}, {@code res/}, etc.)</li>
   <li>Locate the JAR file for the library you want to use and copy it into the {@code
 libs/} directory.
     <p>For example, the library that supports API level 4 and up is located at {@code
 &lt;sdk&gt;/extras/android/support/v4/android-support-v4.jar}.</p>
   </li>
   <li>Add the JAR to your project build path.
     <p>In Eclipse, right-click the JAR file in the Package Explorer, select <strong>Build
 Path</strong> &gt; <strong>Add to Build Path</strong>. You should then see the JAR file appear in a
 new directory called Referenced Libraries.</p>
   </li>
 </ol>

 <p>Your application is now ready to use the library APIs. All the
 provided APIs are available in the {@code android.support} package (for
 example, {@code android.support.v4}).</p>

 <p class="note"><strong>Tip:</strong> To see the library APIs in action, take a look at the sample
 apps in {@code extras/android/support/&lt;version&gt;/samples/}.</p>

 <p class="warning"><strong>Warning:</strong> Be certain that you not confuse the standard
 {@code android} packages with those in {@code android.support} library. Some code completion tools
 might
 get this wrong, especially if you're building against recent versions of the platform. To be safe,
 keep your build target set to the same version as you have defined for your <a
 href="{@docRoot}guide/topics/manifest/uses-sdk-element.html#min">{@code android:minSdkVersion}</a>
 and double check the import statements for classes that also exist in the support library, such as
 {@code SimpleCursorAdapter}.</p>


 <h2 id="Using">Using the v4 Library APIs</h2>

 <p>The support library for v4 provides access to several classes introduced with Android 3.0 and
 beyond, plus some updated version of existing classes, and even some APIs that currently don't
 exist in the Android platform. Some of the most useful and notable classes that have
 counterparts in the v4 support library are:</p>

 <ul>
   <li>{@link android.app.Fragment}</li>
   <li>{@link android.app.FragmentManager}</li>
   <li>{@link android.app.FragmentTransaction}</li>
   <li>{@link android.app.ListFragment}</li>
   <li>{@link android.app.DialogFragment}</li>
   <li>{@link android.app.LoaderManager}</li>
   <li>{@link android.content.Loader}</li>
   <li>{@link android.content.AsyncTaskLoader}</li>
   <li>{@link android.content.CursorLoader}</li>
 </ul>

 <p>For each of the classes above (and others not listed), the APIs work almost exactly the same
 as the counterparts in the latest Android platform. Thus, you can usually refer to
 the online documentation for information about the supported APIs. There are some
 differences, however. Most notably:</p>

 <ul>
   <li>When creating an activity to use fragments, you must declare your activity to extend the
 {@code FragmentActivity} class (instead of the traditional {@link android.app.Activity}
 class).</li>
   <li>To manage your fragments and loaders, you must use the methods {@code
 FragmentActivity.getSupportFragmentManager()} and {@code
 FragmentActivity.getSupportLoaderManager()} (instead of the {@link
 android.app.Activity#getFragmentManager()} and {@link android.app.Activity#getLoaderManager()}
 methods).</li>
   <li>The {@link android.app.ActionBar} is <strong>not supported</strong> by the library.
 However, when creating your <a href="{@docRoot}guide/topics/ui/menus.html#options-menu">Options
 Menu</a>, you can declare which items should be added to the Action Bar when it's available (on
 Android 3.0 or later). You can do so with the {@code MenuCompat.setShowAsAction()} method. For
 example:
 <pre>
 public boolean onCreateOptionsMenu(Menu menu) {
     MenuInflater inflater = getMenuInflater();
     inflater.inflate(R.menu.options, menu);
     MenuCompat.setShowAsAction(menu.findItem(R.id.action_search), 1);
     return true;
 }
 </pre>
 </li>
 </ul>

 <div class="note"><p><strong>Tip:</strong> To enable the Holographic theme on devices
 running Android 3.0 or higher, declare in your manifest file that your application targets
 API level 11. For example:</p>
 <pre>
 &lt;uses-sdk android:minSdkVersion="4" android:targetSdkVersion="11" /&gt;
 </pre>
 <p>This way, your application automatically receives the Holographic theme and the Action Bar for
 each activity when running on Android 3.0 and higher.</p>
 </div>

 <p>For more information about how you can optimize your application for the latest
 Android-powered devices, read <a href="{@docRoot}guide/practices/optimizing-for-3.0.html">Optimizing
 Apps for Android 3.0</a>.</p>


 <h2 id="Docs">Reference Docs</h2>

 <p>The libraries currently do not provide reference documentation for the included APIs. To generate
 your own set using the {@code javadoc} tool, perform the following from a command (as appropriate
 for the library version you're using). In this example, documentation is generated for the v4
 library:</p>

 <pre class="no-pretty-print">
 cd &lt;sdk&gt;/extras/android/support/v4/
 mkdir docs
 javadoc -sourcepath src/java/ -subpackages android.support.v4 -d docs
 </pre>
 <p>Open the {@code docs/index.html} file to begin browsing the generated documentation.</p>


 <h2 id="Samples">Samples</h2>

 <p>If you want to see some code that uses the support libraries, samples are included with the
 Support Package, inside each support library directory. For example, at {@code
 extras/android/support/v4/samples/}.</p>

 <p>Additionally, the <a href="http://code.google.com/p/iosched/">Google I/O App</a> is a complete
 application that uses the v4 support library to provide a single APK for both handsets and tablets
 and also demonstrates some of Android's best practices in Android UI design.</p>
	page.title=Support Package

	@jd:body

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

	<h2>In this document</h2>
	<ol>
	<li><a href="#Notes">Revisions</a></li>
	<li><a href="#Downloading">Downloading the Support Package</a></li>
	<li><a href="#SettingUp">Setting Up a Project to Use a Library</a></li>
	<li><a href="#Using">Using the v4 Library APIs</a></li>
	<li><a href="#Docs">Reference Docs</a></li>
	<li><a href="#Samples">Samples</a></li>
	</ol>

	<h2>See also</h2>
	<ol>
	<li><a
	href="{@docRoot}guide/practices/optimizing-for-3.0.html">Optimizing Apps for Android 3.0</a></li>
	<li><a href="http://code.google.com/p/iosched/">Google I/O App source code</a></li>
	</ol>

	</div>
	</div>

	<p><em>Minimum API level supported:</em> <b>4</b></p>

	<p>The Support Package includes static "support libraries" that you can add to your Android
	application in order to use APIs that are either not available for older platform versions or that
	offer "utility" APIs that aren't a part of the framework APIs. The goal is to simplify your
	development by offering more APIs that you can bundle with your application so you can
	worry less about platform versions.</p>

	<p class="note"><strong>Note:</strong> The Support Package includes more than one support
	library. Each one has a different <em>minimum API level</em>. For example, one library requires API
	level 4 or higher, while another requires API level 13 or higher (v13 is a superset of v4 and includes additional
	support classes to work with v13 APIs). The minimum version is indicated
	by the directory name, such as {@code v4/} and {@code v13/}.</p>


	<h2 id="Notes">Revisions</h2>

	<p>The sections below provide notes about successive releases of
	the Support Package, as denoted by revision number.</p>



	<div class="toggle-content open">

	<p><a href="#" onclick="return toggleContent(this)">
	<img src="{@docRoot}assets/images/triangle-opened.png" class="toggle-content-img" />
	Support Package, revision 4 (October 2011)
	</a></p>

	<div class="toggle-content-toggleme" style="padding-left:2em">
	<dl>
	<dt>Changes for v4 support library:</dt>
	<dd>
	<ul>
	<li>Support for Accessiblity APIs:
	<ul>
	<li>Added <code>AccessibilityDelegateCompat</code> to support
	{@link android.view.View.AccessibilityDelegate}.</li>

	<li>Added <code>AccessibilityEventCompat</code> to support
	{@link android.view.accessibility.AccessibilityEvent}.</li>

	<li>Added <code>AccessibilityManagerCompat</code> to support
	{@link android.view.accessibility.AccessibilityManager}.</li>

	<li>Added <code>AccessibilityNodeInfoCompat</code> to support
	{@link android.view.accessibility.AccessibilityNodeInfo}.</li>

	<li>Added <code>AccessibilityRecordCompat</code> to support
	{@link android.view.accessibility.AccessibilityRecord}.</li>

	<li>Added <code>AccessibilityServiceInfoCompat</code> to support
	{@link android.accessibilityservice.AccessibilityServiceInfo}.</li>

	<li>Added <code>ViewGroupCompat</code>
	to support accessibility features in {@link android.view.ViewGroup}.
	</li>

	<li>Modified <code>ViewCompat</code>
	to support accessibility features in {@link android.view.View}.</li>
	</ul>
	</li>

	<li>Added <code>EdgeEffectCompat</code> to
	support {@link android.widget.EdgeEffect}.</li>

	<li>Added <code>LocalBroadcastManager</code> to allow applications to easily
	register for and receive intents within a single application without
	broadcasting them globally.</li>

	<li>Added support in <code>ViewCompat</code> to check for and set overscroll
	modes for {@link android.view.View}s on Android 2.3 and later.</li>
	<li>Changes to Fragment APIs:
	<ul>
	<li>Added new APIs to control the visibility of new menus.</li>
	<li>Added custom animation APIs.</li>
	<li>Added APIs in <code>FragmentActivity</code> to retain custom,
	non-configuration instance data.</li>
	<li>Various bug fixes.</li>
	</ul>
	</li>
	<li>Changes to <code>ViewPager</code>:
	<ul>
	<li>Added support for margins between pages.
	An optional {@link android.graphics.drawable.Drawable} can be provided
	to fill the margins.</li>
	<li>Added support for {@link android.widget.EdgeEffect}.</li>
	<li>Added support for keyboard navigation</li>
	<li>Added support to control how many pages are kept to either side
	of the current page.</li>
	<li>Improved touch physics.</li>
	</ul>
	</li>

	<li>Fixed a {@link android.content.Loader} bug that caused issues in
	canceling {@link android.os.AsyncTask}s when running on Froyo and older
	versions of the platform. The support
	code now uses its own version of {@link android.os.AsyncTask} to keep the same
	behavior on all platform versions.</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" />
	Compatibility Package, revision 3 (July 2011)
	</a></p>

	<div class="toggle-content-toggleme" style="padding-left:2em">
	<dl>
	<dt>Changes for v4 support library:</dt>
	<dd>
	<ul>
	<li>Adds support for {@link android.app.Fragment.SavedState}</li>
	<li>Adds {@code MotionEventCompat} to support newer {@link
	android.view.MotionEvent} APIs</li>
	<li>Adds {@code VelocityTrackerCompat} to support a newer {@link
	android.view.VelocityTracker} APIs</li>
	<li>Adds {@code ViewConfigurationCompat} to support a newer {@link
	android.view.ViewConfiguration} APIs</li>
	<li>All new APIs (available only in the support library) that allow you to create UIs
	with horizontal paging, allowing users to swipe left and right between content views. Classes to
	support this include:
	<ul>
	<li>{@code ViewPager}: A {@link android.view.ViewGroup} that manages the
	layout for the child views, which the user can swipe between.</li>
	<li>{@code PagerAdapter}: An adapter that populates the {@code ViewPager} with the
	views that represent each page.</li>
	<li>{@code FragmentPagerAdapter}: An extension of {@code PagerAdapter} for flipping
	between fragments.</li>
	<li>{@code FragmentStatePagerAdapter}: An extension of {@code PagerAdapter} for
	flipping between fragments that uses the library's support for {@link
	android.app.Fragment.SavedState}.</li>
	</ul>
	</li>
	</ul>
	</dd>
	<dt>New v13 support library:</dt>
	<dd>
	<ul>
	<li>Includes the {@code FragmentPagerAdapter} and {@code FragmentStatePagerAdapter}
	to support the horizontal paging.
	<p>These are exactly the same as the APIs added to the v4 support library, but rely on
	other platform components in Android 3.2. Use this library instead of v4 if you're developing for
	Android 3.2 and higher (all other APIs in the v4 library are already available with API level
	13).</p>
	</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" />
	Compatibility Package, revision 2 (May 2011)
	</a></p>

	<div class="toggle-content-toggleme" style="padding-left:2em">
	<dl>
	<dt>Changes for v4 library:</dt>
	<dd>
	<ul>
	<li>Support for fragment animations</li>
	<li>Fix {@code Fragment.onActivityResult()} bug</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" />
	Compatibility Package, revision 1 (March 2011)
	</a></p>

	<div class="toggle-content-toggleme" style="padding-left:2em">
	<p>Initial release with the v4 library.</p>
	</div>

	</div>



	<h2 id="Downloading">Downloading the Support Package</h2>

	<p>The Support Package is provided as a downloadable package from the Android SDK and AVD
	Manager. To install:</p>

	<ol>
	<li>Launch the SDK and AVD Manager.
	<p>From Eclipse, you can select <strong>Window</strong>
	> <strong>Android SDK and AVD Manager</strong>. Or, launch {@code SDK Manager.exe} from
	the {@code <sdk>/} directory (on Windows only) or {@code android} from the {@code
	<sdk>/tools/} directory.</p></li>
	<li>Expand the Android Repository, check <strong>Android Support package</strong>
	and click <strong>Install selected</strong>.</li>
	<li>Proceed to install the package.</li>
	</ol>

	<p>When done, all files (including source code, samples, and the {@code .jar} files) are saved
	into the <code><sdk>/extras/android/support/</code> directory. This directory contains
	each of the different support libraries, such as the library for API level 4 and up and the library
	for API level 13 and up, each named with the respective version (such as {@code v4/}).</p>


	<h2 id="SettingUp">Setting Up a Project to Use a Library</h2>

	<p>To add one of the libraries to your Android project:</p>
	<ol>
	<li>In your Android project, create a directory named {@code libs} at the root of your
	project (next to {@code src/}, {@code res/}, etc.)</li>
	<li>Locate the JAR file for the library you want to use and copy it into the {@code
	libs/} directory.
	<p>For example, the library that supports API level 4 and up is located at {@code
	<sdk>/extras/android/support/v4/android-support-v4.jar}.</p>
	</li>
	<li>Add the JAR to your project build path.
	<p>In Eclipse, right-click the JAR file in the Package Explorer, select <strong>Build
	Path</strong> > <strong>Add to Build Path</strong>. You should then see the JAR file appear in a
	new directory called Referenced Libraries.</p>
	</li>
	</ol>

	<p>Your application is now ready to use the library APIs. All the
	provided APIs are available in the {@code android.support} package (for
	example, {@code android.support.v4}).</p>

	<p class="note"><strong>Tip:</strong> To see the library APIs in action, take a look at the sample
	apps in {@code extras/android/support/<version>/samples/}.</p>

	<p class="warning"><strong>Warning:</strong> Be certain that you not confuse the standard
	{@code android} packages with those in {@code android.support} library. Some code completion tools
	might
	get this wrong, especially if you're building against recent versions of the platform. To be safe,
	keep your build target set to the same version as you have defined for your <a
	href="{@docRoot}guide/topics/manifest/uses-sdk-element.html#min">{@code android:minSdkVersion}</a>
	and double check the import statements for classes that also exist in the support library, such as
	{@code SimpleCursorAdapter}.</p>


	<h2 id="Using">Using the v4 Library APIs</h2>

	<p>The support library for v4 provides access to several classes introduced with Android 3.0 and
	beyond, plus some updated version of existing classes, and even some APIs that currently don't
	exist in the Android platform. Some of the most useful and notable classes that have
	counterparts in the v4 support library are:</p>

	<ul>
	<li>{@link android.app.Fragment}</li>
	<li>{@link android.app.FragmentManager}</li>
	<li>{@link android.app.FragmentTransaction}</li>
	<li>{@link android.app.ListFragment}</li>
	<li>{@link android.app.DialogFragment}</li>
	<li>{@link android.app.LoaderManager}</li>
	<li>{@link android.content.Loader}</li>
	<li>{@link android.content.AsyncTaskLoader}</li>
	<li>{@link android.content.CursorLoader}</li>
	</ul>

	<p>For each of the classes above (and others not listed), the APIs work almost exactly the same
	as the counterparts in the latest Android platform. Thus, you can usually refer to
	the online documentation for information about the supported APIs. There are some
	differences, however. Most notably:</p>

	<ul>
	<li>When creating an activity to use fragments, you must declare your activity to extend the
	{@code FragmentActivity} class (instead of the traditional {@link android.app.Activity}
	class).</li>
	<li>To manage your fragments and loaders, you must use the methods {@code
	FragmentActivity.getSupportFragmentManager()} and {@code
	FragmentActivity.getSupportLoaderManager()} (instead of the {@link
	android.app.Activity#getFragmentManager()} and {@link android.app.Activity#getLoaderManager()}
	methods).</li>
	<li>The {@link android.app.ActionBar} is <strong>not supported</strong> by the library.
	However, when creating your <a href="{@docRoot}guide/topics/ui/menus.html#options-menu">Options
	Menu</a>, you can declare which items should be added to the Action Bar when it's available (on
	Android 3.0 or later). You can do so with the {@code MenuCompat.setShowAsAction()} method. For
	example:
	<pre>
	public boolean onCreateOptionsMenu(Menu menu) {
	MenuInflater inflater = getMenuInflater();
	inflater.inflate(R.menu.options, menu);
	MenuCompat.setShowAsAction(menu.findItem(R.id.action_search), 1);
	return true;
	}
	</pre>
	</li>
	</ul>

	<div class="note"><p><strong>Tip:</strong> To enable the Holographic theme on devices
	running Android 3.0 or higher, declare in your manifest file that your application targets
	API level 11. For example:</p>
	<pre>
	<uses-sdk android:minSdkVersion="4" android:targetSdkVersion="11" />
	</pre>
	<p>This way, your application automatically receives the Holographic theme and the Action Bar for
	each activity when running on Android 3.0 and higher.</p>
	</div>

	<p>For more information about how you can optimize your application for the latest
	Android-powered devices, read <a href="{@docRoot}guide/practices/optimizing-for-3.0.html">Optimizing
	Apps for Android 3.0</a>.</p>


	<h2 id="Docs">Reference Docs</h2>

	<p>The libraries currently do not provide reference documentation for the included APIs. To generate
	your own set using the {@code javadoc} tool, perform the following from a command (as appropriate
	for the library version you're using). In this example, documentation is generated for the v4
	library:</p>

	<pre class="no-pretty-print">
	cd <sdk>/extras/android/support/v4/
	mkdir docs
	javadoc -sourcepath src/java/ -subpackages android.support.v4 -d docs
	</pre>
	<p>Open the {@code docs/index.html} file to begin browsing the generated documentation.</p>


	<h2 id="Samples">Samples</h2>

	<p>If you want to see some code that uses the support libraries, samples are included with the
	Support Package, inside each support library directory. For example, at {@code
	extras/android/support/v4/samples/}.</p>

	<p>Additionally, the <a href="http://code.google.com/p/iosched/">Google I/O App</a> is a complete
	application that uses the v4 support library to provide a single APK for both handsets and tablets
	and also demonstrates some of Android's best practices in Android UI design.</p>