page.title=Support Library

@jd:body

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

    <h2>In this document</h2>
    <ol>
      <li><a href="#overview">Overview</a></li>
      <li><a href="#revisions">Revisions</a></li>
    </ol>

    <h2>See also</h2>
    <ol>
      <li><a href="{@docRoot}tools/support-library/features.html">
        Support Library Features</a></li>
      <li><a href="{@docRoot}tools/support-library/setup.html">
        Support Library Setup </a></li>
    </ol>

  </div>
</div>

<p>The Android Support Library package is a set of code libraries that provide
  backward-compatible versions of Android framework APIs as well as features that are only available
  through the library APIs. Each Support Library is backward-compatible to a specific Android API
  level. This design means that your applications can use the libraries' features and still be
  compatible with devices running Android 1.6 (API level 4) and up.</p>

<p>This guide provides information about what features are enabled by the Support Libraries,
  how to use them in your development environment and information about library releases.</p>


<h2 id="overview">Overview</h2>

<p>Including the Support Libraries in your Android project is considered a best practice for
  application developers, depending on the range of platform versions your app is targeting
  and the APIs that it uses. Using the features the libraries provide can help you improve the look of your
  application, increase performance and broaden the reach of your application to more users.
  If you use the Android
  <a href="{@docRoot}tools/projects/templates.html">code template</a> tools, you will notice that
  all the Android application templates include one or more of the Support Libraries by default.</p>

<p>The Support Libraries each target a base Android API level and each provides a different set
  of features. In order to effectively use the libraries, it is important to consider what features
  you want to support and understand what features are supported by each library at what Android
  API level. To get started, review the
  <a href="{@docRoot}tools/support-library/features.html">Support Library Features</a> guide.
  After that, go to the
  <a href="{@docRoot}tools/support-library/setup.html">Support Library Setup</a> topic to
  learn how to incorporate the Support Libraries into your application. For more details
  about Support Library APIs, see the {@link android.support.v4.app android.support}
  packages in the API reference.</p>


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

<p>This section provides details about the Support Library package releases.</p>

<div class="toggle-content opened">
  <p id="rev23-2-1">
    <a href="#" onclick="return toggleContent(this)"><img src=
    "{@docRoot}assets/images/styles/disclosure_up.png" class="toggle-content-img"
    alt="">Android Support Library, revision 23.2.1</a> <em>(March
    2016)</em>
  </p>

  <div class="toggle-content-toggleme">
    <dl>
      <dt>
        Changes for <a href=
        "{@docRoot}tools/support-library/features.html#v4">v4 Support
        Library</a>:
      </dt>

      <dd>
        <ul>
          <li>Fixed an exception in {@link
          android.support.v4.graphics.drawable.DrawableCompat#wrap
          DrawableCompat.wrap()} and {@link android.graphics.drawable.LayerDrawable} on
          API levels 17 to 19. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201817">Issue 201817</a>)
          </li>

          <li>Fixed an {@code ArrayIndexOutOfBoundsException} in {@link
          android.support.v4.widget.ViewDragHelper#shouldInterceptTouchEvent
          ViewDragHelper.shouldInterceptTouchEvent()}. (<a class="external-link"
            href="https://code.google.com/p/android/issues/detail?id=182262">Issue
            182262</a>)
          </li>

          <li>Fixed a bug in {@link android.support.v4.view.ViewPager} related to
          scroll calculation for size changes.
          </li>

          <li>Fixed a {@code NullPointerException} when {@code
          DrawerLayout.removeDrawerListener()} is called without a set {@link
          android.support.v4.widget.DrawerLayout.DrawerListener
          DrawerLayout.DrawerListener}. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=202478">Issue 202478</a>)
          </li>

          <li>Fixed a bug where {@link android.support.v4.view.ViewPager} does not set
          {@link android.view.accessibility.AccessibilityEvent} parameters properly
          when scrolling.
          </li>

          <li>Fixed an issue that caused lag during device rotation when using
          {@link android.support.v4.graphics.drawable.DrawableCompat#wrap
          Drawable.wrap()}. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201924">Issue 201924</a>)
          </li>
        </ul>
      </dd>

      <dt>
        Changes for <a href=
        "{@docRoot}tools/support-library/features.html#v7-appcompat">v7
        appcompat library</a>:
      </dt>

      <dd>
        <ul>
          <li>Reverted dependency on vector assets so that developers using the
            <a href="{@docRoot}tools/support-library/features.html#v7-appcompat">appcompat
            library</a> are not forced to use {@link
            android.graphics.drawable.VectorDrawable} and its associated build flags.
          </li>

          <li>Fixed a compatibility issue with Night Mode and API level 23.
            (<a class="external-link" href=
            "https://code.google.com/p/android/issues/detail?id=201910">Issue
            201910</a>)
          </li>

          <li>Fixed a compatibility issue with {@link
          android.support.v7.widget.SwitchCompat} and API level 7. (<a class=
          "external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201942">Issue 201942</a>)
          </li>

          <li>Fixed an issue with propagating configuration values in Resources objects
          <a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201928">Issue 201928</a>
          </li>

          <li>Fixed a compatibility issue where the {@link
          android.support.v7.app.NotificationCompat.MediaStyle
          NotificationCompat.MediaStyle} cancel button becomes invisible on API level
          21 and below. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=202156">Issue 202156</a>)
          </li>

          <li>Fixed a compatibility crash with {@link
          android.support.v7.widget.AppCompatSpinner} on API level 21 and below.
          (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=202246">Issue 202246</a>)
          </li>

          <li>Fixed an issue where the {@code app:textAllCaps = "false"} style did not
          work. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=202117">Issue 202117</a>)
          </li>

          <li>Fixed a crash when restoring {@link android.widget.SearchView}.
            (<a class="external-link" href=
            "https://code.google.com/p/android/issues/detail?id=201836">Issue
            201836</a>)
          </li>

          <li>Fixed a memory leak that occurs when tinting drawable resources using
          AppCompat. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=202379">Issue 202379</a>)
          </li>

          <li>Fixed an issue with {@link android.view.KeyEvent} on API level 11 and
          lower. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=202939">Issue 202939</a>)
          </li>
        </ul>
      </dd>

      <dt>
        Changes for <a href=
        "{@docRoot}tools/support-library/features.html#v7-cardview">v7 cardview
        library</a>:
      </dt>

      <dd>
        <ul>
          <li>Added Night Mode support for {@link
          android.support.v7.widget.CardView}. (<a class="external-link"
            href="https://code.google.com/p/android/issues/detail?id=194497">Issue
            194497</a>)
          </li>
        </ul>
      </dd>

      <dt>
        Changes for <a href=
        "{@docRoot}tools/support-library/features.html#v7-recyclerview">v7
        recyclerview library</a>:
      </dt>

      <dd>
        <ul>
          <li>Fixed bugs related to various measure-spec methods. (<a class=
          "external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201856">Issue
          201856</a>)
          </li>

          <li>Reduced the lockdown period in which {@link
          android.support.v7.widget.RecyclerView} does not allow adapter
          changes while calculating a layout or scroll. (<a class=
          "external-link" href=
          "https://code.google.com/p/android/issues/detail?id=202046">Issue
          202046</a>)
          </li>

          <li>Fixed a crash when calling {@link
          android.support.v7.widget.RecyclerView.Adapter#notifyItemChanged
          notifyItemChanged()} on an item that is out of view. (<a class=
          "external-link" href=
          "https://code.google.com/p/android/issues/detail?id=202136">Issue
          202136</a>)
          </li>

          <li>Fixed a crash that occurs when {@link
          android.support.v7.widget.RecyclerView.LayoutManager
          RecyclerView.LayoutManager} adds and removes a view in the same
          measurement pass. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=193958">Issue
          193958</a>)
          </li>
        </ul>
      </dd>

      <dt>
        Changes for <a href=
        "{@docRoot}tools/support-library/features.html#v7-mediarouter">v7
        mediarouter library</a>:
      </dt>

      <dd>
        <ul>
          <li>Fixed a crash that occurs when calling {@link
          android.support.v7.media.MediaRouter#getInstance
          MediaRouter.getInstance()} on API level 17. (<a class="external-link"
            href=
            "https://code.google.com/p/android/issues/detail?id=180654">Issue
            180654</a>)
          </li>
        </ul>
      </dd>

      <dt>
        Changes for <a href=
        "{@docRoot}tools/support-library/features.html#v17-leanback">v17
        Leanback Library</a>:
      </dt>

      <dd>
        <ul>
          <li>Fixed an issue with {@code GridLayout.onAddFocusables()} that
          caused the wrong item to be selected.
          </li>

          <li>Fixed issue with {@link
          android.support.v17.leanback.app.GuidedStepFragment} actions
          disappearing after an action was collapsed.
          </li>
        </ul>
      </dd>

      <dt>
        Changes for <a href=
        "{@docRoot}tools/support-library/features.html#design">Design Support
        Library</a>:
      </dt>

      <dd>
        <ul>
          <li>Fixed a {@link android.support.design.widget.TabLayout} crash
          caused by tab-pooling. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201827">Issue
          201827</a>)
          </li>

          <li>Fixed a bug in {@link
          android.support.design.widget.NavigationView} that caused the wrong
          color to be selected. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201951">Issue
          201951</a>)
          </li>

          <li>Fixed a bug where {@link
          android.support.design.widget.FloatingActionButton#setBackgroundTintList
          setBackgroundTintList()} was no longer able to change the background
          color. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201873">Issue
          201873</a>)
          </li>

          <li>Fixed an issue where {@link
          android.support.design.widget.AppBarLayout} did not completely scroll
          out of view when used with {@code android:fitsSystemWindows = “true”}.
          (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201822">Issue
          201822</a>)
          </li>

          <li>Fixed an issue where {@code BottomSheetDialog} did not display
          short content views correctly. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201793">Issue
          201793</a>)
          </li>

          <li>Fixed an issue where {@code BottomSheetDialogFragment} moved
          sporadically when content inside was changed. (<a class=
          "external-link" href=
          "https://code.google.com/p/android/issues/detail?id=202125">Issue
          202125</a>)
          </li>

          <li>Fixed a crash in TextInputLayout counter <a class="external-link"
            href=
            "https://code.google.com/p/android/issues/detail?id=202051">link</a>
          </li>

          <li>Fixed a crash that occured when {@link
          android.support.design.widget.TextInputLayout#getCounterMaxLength
          TextInputLayout.getCounterMaxLength()} restored a saved state.
          (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=202375">Issue
          202375</a>)
          </li>

          <li>Fixed a {@code ClassCastException} that occurred when restoring a
          {@link android.support.design.widget.CoordinatorLayout} using the
          saved state of a view that was not a {@link
          android.support.design.widget.CoordinatorLayout}.
          </li>
        </ul>
      </dd>

      <dt>
        Changes for VectorDrawableCompat:
      </dt>

      <dd>
        <ul>
          <li>Fixed a bug where the wrong variable was read for {@code
          android:tintMode}. (<a class="external-link" href=
          "https://code.google.com/p/android/issues/detail?id=201907">Issue
          201907</a>)
          </li>
        </ul>
      </dd>
    </dl>
  </div>
</div>
<!-- end of collapsible section -->

<div class="toggle-content closed">
  <p id="rev23-2-0">
    <a href="#" onclick="return toggleContent(this)"><img src=
    "{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img"
    alt="">Android Support Library, revision 23.2.0</a> <em>(February
    2016)</em>
  </p>

  <div class="toggle-content-toggleme">
    <dl>
      <dt>
        Changes for <a href="features.html#v4">v4 Support library</a>:
      </dt>

      <dd>
        <ul>
          <li>Added {@code MediaBrowserCompat} for {@link
          android.media.browse.MediaBrowser} support, and {@code
          MediaBrowserServiceCompat} for {@link
          android.service.media.MediaBrowserService} support. This is useful
          when connecting a media app’s background service with UI components,
          and integrating with Android Auto and Android Wear without requiring
          API level 21 or higher.
          </li>

          <li>The system now calls {@link
          android.support.v4.app.FragmentActivity#onActivityResult onActivityResult()} for a
          nested {@link android.support.v4.app.FragmentActivity}.
          </li>
        </ul>
      </dd>

      <dt>
        Changes for <a href="features.html#v7-appcompat">v7 AppCompat
        library</a>:
      </dt>

      <dd>
        <ul>
          <li>Added Night Mode functionality to API level 14 and higher. Switch
          between <a href="{@docRoot}training/material/theme.html">Material
          Light and Material Dark Themes</a> based on the time of day or
          app-specific setting.
          </li>

          <li style="list-style: none; display: inline">
            <ul>
              <li>Day and night themes can be found here: {@code
              &lt;sdk&gt;/extras/android/support/v7/appcompat/res/values/themes_daynight.xml}
              </li>

              <li>{@code AppCompatDelegate.setDefaultNightMode()}: sets the
              app’s default mode by passing one of the following constants:
              </li>

              <li style="list-style: none; display: inline">
                <ul>
                  <li>{@code MODE_NIGHT_AUTO}
                  </li>

                  <li>{@code MODE_NIGHT_NO}
                  </li>

                  <li>{@code MODE_NIGHT_YES}
                  </li>

                  <li>{@code MODE_NIGHT_FOLLOW_SYSTEM}
                  </li>
                </ul>
              </li>

              <li>{@code AppCompatDelegate.setLocalNightMode()}: overrides
              the night mode setting for the local app component.
              </li>

              <li>{@code AppCompatDelegate.getDefaultNightMode()}: returns
              the default night mode.
              </li>
            </ul>
          </li>
        </ul>
      </dd>

      <dt>
        Changes for <a href="features.html#v7-mediarouter">v7 mediarouter
        library</a>:
      </dt>

      <dd>
        <ul>
          <li>{@link android.support.v7.app.MediaRouteControllerDialog} now
          correctly applies custom app theme colors.
          </li>
        </ul>
      </dd>

      <dt>
        Changes for <a href="features.html#design">Design support library</a>:
      </dt>

      <dd>
        <ul>
          <li>Added support for <a href=
          "https://www.google.com/design/spec/components/bottom-sheets.html">bottom
          sheets</a>. An interaction plugin, {@code
          BottomSheetBehavior}, allows a child view of a {@link
          android.support.design.widget.CoordinatorLayout} to act as
          a bottom sheet. The base class, {@code BottomSheetCallback}, provides
          callbacks to monitor bottom sheet events.
          </li>
        </ul>
      </dd>

      <dt>
        Changes for the <a href="features.html#custom-tabs">CustomTabs support
        library</a>:
      </dt>

      <dd>
        <ul>
          <li>
            <a href=
            "https://developer.chrome.com/multidevice/android/customtabs">Chrome
            Custom Tabs</a> now allows apps to include a bottom bar with action
            buttons in addition to the existing top action button.
          </li>

          <li>{@code CustomTabsIntent.Builder.addToolBarItem()}: adds an action
          button to a custom tab. You can use this to add multiple buttons.
          </li>

          <li>{@code CustomTabsSession.setToolBarItem()}: updates the visuals
          for toolbar items. This method will only succeed if it is given a
          valid id and the browser session is in the foreground.
          </li>
        </ul>
      </dd>

      <dt>
        Added VectorDrawable support library:
      </dt>

      <dd>
        <ul>
          <li>Added Classes:
          </li>

          <li style="list-style: none; display: inline">
            <ul>
              <li>{@code VectorDrawableCompat}
              </li>

              <li>{@code AnimatedVectorDrawableCompat}
              </li>
            </ul>
          </li>

          <li>Adds support for {@link
          android.graphics.drawable.VectorDrawable} assets to apps
          running on API level 7 or higher. {@link
          android.graphics.drawable.AnimatedVectorDrawable} assets
          are also supported on API level 11 or higher. Vector assets can be
          considerably smaller than image assets and should help reduce app
          size by reducing the amount of assets required to support multiple
          device screens.
          </li>

          <li>This library is now a dependency of the <a href=
          "features.html#v7-appcompat">v7 AppCompat library</a>, allowing
          developers and <a href="features.html#v7-appcompat">AppCompat </a>
          to easily use vector drawables. To use {@code
          VectorDrawableCompat} within an {@link android.widget.ImageButton} or
          {@link android.widget.ImageView}, use the {@code app:srcCompat} XML
          attribute or {@code setImageResource()}
          method.
          </li>

          <li>To keep referencing attribute IDs on API level 20 or
          lower, add the following {@code appt} flag to your {@code
          build,gradle} file:
          </li>

          <li style="list-style: none; display: inline">
            <ul>
              <li>If you are building with Android Plugin for Gradle 1.5.0 or
              lower, add the following to your {@code build.gradle} file:
              </li>

              <li style="list-style: none; display: inline">
                <pre>
android {
  defaultConfig {
    // Stops the Gradle’s automatic rasterization of vectors
    generatedDensities = []
  }
   // Flag that tells aapt to keep the attribute ids
  aaptOptions {
    additionalParameters "--no-version-vectors"
  }
}
</pre>
              </li>

              <li>If you are building with Android Plugin for Gradle 2.0.0 or
              higher, add the following to your {@code build.gradle} file:
              </li>

              <li style="list-style: none; display: inline">
                <pre>
android {
  defaultConfig {
    vectorDrawables.useSupportLibrary = true
  }
}
</pre>
              </li>
            </ul>
          </li>
        </ul>
      </dd>

      <dt>
        Changes for <a href="features.html#v17-leanback">v17 Leanback
        Library</a>:
      </dt>

      <dd>
        <ul>
          <li>Added new capabilities to {@link android.support.v17.leanback.app.GuidedStepFragment},
          which is a component that guides users through a decision or series of decisions:
          </li>

          <li style="list-style: none; display: inline">
            <ul>
              <li>Added button actions to {@link
              android.support.v17.leanback.widget.GuidedAction}:
              </li>

                <ul>
                  <li>{@code GuidedStepFragment.setButtonActions()}: sets a list of
                  {@link android.support.v17.leanback.widget.GuidedAction} buttons that
                  the user may select from the Actions view.
                  </li>
                </ul>
              </li>

              <li>Description fields are now editable:
              </li>

              <li style="list-style: none; display: inline">
                <ul>
                  <li>{@code GuidedAction.Builder.descriptionEditable()}: when passing
                  {@code true}, sets the action’s description to be editable.
                  </li>

                  <li>{@code GuidedAction.getEditDescription()}: returns the editable
                  description as a {@code CharSequence}.
                  </li>
                </ul>
              </li>

              <li>Added drop-down lists of sub-actions:
              </li>

              <li style="list-style: none; display: inline">
                <ul>
                  <li>{@code GuidedAction.setSubActions()}: sets a {@link
                  android.support.v17.leanback.widget.GuidedAction} list as a drop-down
                  menu of sub-actions.
                  </li>
                </ul>
              </li>
            </ul>

          <li>Added the {@code GuidedDatePickerAction} widget for {@link
          android.widget.DatePicker} functionality:
          </li>

          <li style="list-style: none; display: inline">
            <ul>
              <li>The date is selected using year, month, and day columns and has a
              customizable range.
              </li>

              <li>{@code GuidedDatePickerAction.Builder}: builder class for the {@code
              GuidedDatePickerAction} object.
              </li>

              <li>{@code GuidedDatePickerAction.Builder.datePickerFormat(String
              datePickerFormat)}: set the desired date format by passing the
              appropriate three-character {@code String}, e.g. {@code “YMD”} or {@code
              “MDY”}. Alternatively, use the {@code datePickerFormat} XML attribute.
              </li>
            </ul>
          </li>
        </ul>
      </dd>
    </dl>

    <dl>
      <dt>
        Changes for <a href="features.html#v7-recyclerview">v7 RecyclerView
        library</a>:
      </dt>

      <dd>
        <ul>
          <li>{@link android.support.v7.widget.RecyclerView} now has an opt-in
          feature called <em>AutoMeasure</em> which allows {@link
          android.support.v7.widget.RecyclerView.LayoutManager} to easily wrap
          content or handle various measurement specifications provided by the
          parent of the {@link android.support.v7.widget.RecyclerView}. It
          supports all existing animation capabilities of the {@link
          android.support.v7.widget.RecyclerView}.
          </li>

          <li style="list-style: none; display: inline">
            <ul>
              <li>If you have a custom {@link
              android.support.v7.widget.RecyclerView.LayoutManager},
              call {@code setAutoMeasureEnabled(true)} to start using the new
              AutoMeasure API. All built-in {@link
              android.support.v7.widget.RecyclerView.LayoutManager} objects
              enable auto-measure by default.
              </li>

              <li>{@link android.support.v7.widget.RecyclerView.LayoutManager}
              no longer ignores some {@link
              android.support.v7.widget.RecyclerView.LayoutParams} settings,
              such as {@code MATCH_PARENT} in the scroll direction.
                <p class="note">
                  <strong>Note:</strong> These lifted restrictions may cause
                  unexpected behavior in your layouts. Make sure you specify
                  the correct layout parameters.
                </p>
              </li>
            </ul>
          </li>

          <li>When updating a {@link
          android.support.v7.widget.RecyclerView.ViewHolder} with payload
          information, {@link android.support.v7.widget.DefaultItemAnimator}
          now disables change animations.
          </li>

          <li>You can now modify the {@link
          android.support.v7.widget.helper.ItemTouchHelper} escape velocity to
          control swipe sensitivity. To make it easier or harder to swipe,
          override {@code getSwipeEscapeVelocity(float defaultValue)} and modify {@code defaultValue}.
          </li>
        </ul>
      </dd>
    </dl>
  </div>
</div>
<!-- end of collapsible section -->

<div class="toggle-content closed">
  <p id="rev23-1-1"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 23.1.1</a> <em>(November 2015)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for <a href="features.html#v7-recyclerview">v7 recyclerview library:</a></dt>
      <dd>
        <ul>
          <li>Fixed a crash that occurs when you perform a swipe-to-dismiss action that the
            {@code ItemTouchHelper} utility class provides, and then add an item.
            (<a href="http://b.android.com/190500">Issue 190500</a>)</li>
         </ul>
      </dd>
      <dt>Changes for <a href="features.html#v7-preference">v7 preference library:</a></dt>
      <dd>
        <ul>
          <li>Fixed an issue with ProGuard usage.
          (<a href="http://b.android.com/183261">Issue 183261</a>)</li>
         </ul>
      </dd>

      <dt>Changes for <a href="features.html#v17-leanback">v17 Leanback Support library:</a></dt>
      <dd>
        <ul>
          <li>Fixed a number of internal issues in this library.</li>
         </ul>
      </dd>
      <dt>Changes for <a href="features.html#design">Design Support library:</a></dt>
      <dd>
        <ul>
          <li>Added the <code>getHeaderView</code> method to the <code>NavigationView</code> class.</li>
          <li>Fixed a transparent background issue for a <code>FloatingActionButton</code> object on
          devices running Android 4.0 (API level 15) and lower.
          (<a href="http://b.android.com/183315">Issue 183315</a>)</li>
         </ul>
       </dd>
    </dl>

  </div>
</div> <!-- end of collapsible section -->


<div class="toggle-content closed">
  <p id="rev23-1-0"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 23.1.0</a> <em>(October 2015)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for <a href="features.html#v4">v4 Support library:</a></dt>
       <dd>
        <ul>
           <li>Added <code>OnScrollChangedListener</code> interface support to the
            <code>NestedScrollView</code> widget. It
            allows you to receive callbacks when the scroll X or Y positions change.</li>
          <li>Added a <code>MediaButtonReceiver</code> class to forward received playback controls
            to a service that’s managing the <code>MediaSessionCompat</code> class. The
            <code>MediaSessionCompat</code> class has a
            constructor that can automatically find a media button receiver in the manifest. A
            media button receiver is a key part to <a href=
          "http://developer.android.com/training/managing-audio/volume-playback.html#PlaybackControls">handling
          playback controls</a> from hardware or bluetooth controls.</li>
        </ul>
       </dd>


      <dt>Changes for <a href="features.html#v7-appcompat">v7 appcompat library:</a></dt>
       <dd>
        <ul>
          <li>Added material design <code>Seekbar</code> and <code>ImageButton</code> widgets.</li>
          <li>Updated the <code>ImageView</code> widget to support the tint feature.</li>
          <li>Updated the look-and-feel of the <code>SwitchCompat</code> widget.</li>
         </ul>
       </dd>

      <dt>Changes for <a href="features.html#v7-mediarouter">v7 mediarouter library:</a></dt>
       <dd>
        <ul>
        <li>Added the following features to the <code>MediaRouteChooserDialog</code> class:</li>
        <ul>
          <li>Displays a loading page while discovering media route providers.</li>
          <li>Includes a device type icon for easier device identification.</li>
          <li>Sorts the routes according to frequency of use in the current app.</li>
          <li>Supports landscape mode.</li>
        </ul>
        </ul>
        <ul>
        <li>Added the following features to the <code>MediaRouteControllerDialog</code> class:</li>
        <ul>
           <li>Recognizes screen casting and provides a proper description.</li>
           <li>Supports various album art sizes and aspect ratios, and loads the art asynchronously.</li>
           <li>Automatically selects the content color based on the primary color of the app.</li>
           <li>Adjusts the dialog layout based on available screen space on the device.</li>
           <li>Supports landscape mode.</li>
        </ul>
        </ul>
       </dd>

      <dt>Changes for <a href="features.html#v7-palette">v7 palette library:</a></dt>
       <dd>
        <ul>
          <li>Added the <code>setRegion()</code> method to support extracting color from a specific
            region of a <code>Bitmap</code> object.</li>
         </ul>
       </dd>

      <dt>Changes for <a href="features.html#v7-recyclerview">v7 recyclerview library:</a></dt>
       <dd>
        <ul>
        <li>Added an improved animation API to the <code>ItemAnimator</code> class for better
          customizations:</li>
           <ul>
           <li>Change animations no longer enforce two copies of the <code>ViewHolder</code> object,
            which enables item content animations. Also, the <code>ItemAnimator</code> object
            decides whether it wants to reuse the same <code>ViewHolder</code> object or create a
            new one.</li>
           <li>The new information record API gives the <code>ItemAnimator</code> class the flexibility
            to collect data at the correct point in the layout lifecycle. This information is later
            passed into the animate callbacks.</li>
            </ul>
         </ul>
          <ul>
          <li>Provided an easy transition plan for this backward-incompatible API change:</li>
           <ul>
           <li>If you’ve previously extended the <code>ItemAnimator</code> class, you can change
            your base class to <code>SimpleItemAnimator</code> and your code should work as before.
            The <code>SimpleItemAnimator</code> class provides the old API by wrapping the new API.</li>
           <li>Some methods were removed from the <code>ItemAnimator</code> class. The following
            code will no longer compile:</li>
           <pre>recyclerView.getItemAnimator().setSupportsChangeAnimations(false)</pre>
           <p>You can replace it with:</p>
           <pre>
ItemAnimator animator = recyclerView.getItemAnimator();
if (animator instanceof SimpleItemAnimator) {
   ((SimpleItemAnimator) animator).setSupportsChangeAnimations(false);
}
           </pre>
          </ul>
         </ul>
       </dd>


      <dt>Changes for <a href="features.html#v7-preference">v7</a>,
          <a href="features.html#v14-preference">v14</a>, and
          <a href="features.html#v17-preference">v17</a> Preference Support library:</dt>
       <dd>
        <ul>
          <li>Removed APIs for controlling <code>EditText</code> dialogs.</li>
         </ul>
       </dd>

     <dt>Changes for <a href="features.html#v17-leanback">v17 Leanback Support library:</a></dt>
      <dd>
        <ul>
          <li>Added a version of the <code>GuidedStepFragment</code> class for the Support library
            (extends <code>android.support.v4.app.Fragment</code>), and improved animations and
            transitions.</li>
          <li>Updated the <code>GuidedStepFragment</code> class so it can be placed on top of
            existing content.</li>
          <li>Added the ability to annotate different types of search completions to the
          <code>SearchFragment</code> class.</li>
          <li>Added staggered slide transition support to the <code>VerticalGridFragment</code>
            class.</li>
         </ul>
       </dd>


     <dt>Changes for <a href="features.html#design">Design Support library:</a></dt>
      <dd>
        <ul>
          <li>Added <a href=
  "https://www.google.com/design/spec/components/text-fields.html#text-fields-character-counter">
          character counting</a> support to the <code>TextInputLayout</code> widget.</li>
          <li>Added edge snapping support to the <code>AppBarLayout</code> class by adding the
            <code>SCROLL_FLAG_SNAP</code> constant. When scrolling ends, if the view is only
            partially visible, the view is snapped and scrolled to its closest edge.</li>
          <li>Added support for custom views to the <code>NavigationView</code> class by using the
            <code>app:actionLayout</code> attribute or <code>MenuItemCompat.setActionView()</code>
            method.</li>
         </ul>
       </dd>


     <dt>Changes for <a href="features.html#custom-tabs">Custom Tabs Support library:</a></dt>
      <dd>
        <ul>
          <li>Added the <code>enableUrlBarHiding()</code> method to the <code>CustomTabsIntent</code>
            class. It lets the client customize whether the URL bar should be hidden automatically
            on scroll down.</li>
          <li>Added the <code>setActionButton()</code> method to the <code>CustomTabsSession</code>
            class. It lets the client
            change the icon for a custom action button in an already launched custom tab.</li>
          <li>Added the <code>TAB_SHOWN</code> and <code>TAB_HIDDEN</code> constants as new events
            for the <code>onNavigationEvent</code> method of the <code>CustomTabsCallback</code>
            class.</li>
         </ul>
       </dd>

    </dl>

  </div>
</div> <!-- end of collapsible section -->


<div class="toggle-content closed">
  <p id="rev23-0-1"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 23.0.1</a> <em>(September 2015)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for <a href="features.html#v7-preference">v7</a> and
          <a href="features.html#v14-preference">v14</a> Preference Support library:</dt>
       <dd>
        <ul>
          <li>Added the material design layout and style files.
          (<a href="http://b.android.com/183376">Issue 183376</a>)</li>
         </ul>
       </dd>


      <dt>Changes for <a href="features.html#v7-appcompat">v7 appcompat library:</a></dt>
       <dd>
        <ul>
          <li>Fixed crash issues for the {@link android.app.Fragment} class by limiting the use of
              hardware layers to Android 4.1 (API level 16) and higher.
          (<a href="http://b.android.com/183896">Issue 183896</a>)</li>
          <li>Fixed an issue where hardware buttons did not work when an activity had set the
            {@link android.widget.Toolbar} class to act as the
            {@link android.app.ActionBar} by using the <code>setSupportActionBar()</code> method.
          (<a href="http://b.android.com/183334">Issue 183334</a>)</li>
          <li>Updated the {@link android.support.v7.app.AppCompatDialogFragment} class so it
            no longer throws the {@code Windows feature must be requested before adding content}
            error.
          (<a href="http://b.android.com/183186">Issue 183186</a>)</li>
         </ul>
       </dd>


     <dt>Changes for <a href="features.html#design">Design Support library:</a></dt>
      <dd>
        <ul>
          <li>Fixed the
            {@link android.support.design.widget.AppBarLayout} class so it now draws correctly after
            rotation.
          (<a href="http://b.android.com/183109">Issue 183109</a>)</li>
          <li>Fixed the
            {@link android.support.design.widget.TabLayout} class so it now behaves correctly when a
            user clicks after a swipe.
          (<a href="http://b.android.com/183123">Issue 183123</a>)</li>
         </ul>
       </dd>


     <dt>Changes for <a href="features.html#custom-tabs">Custom Tabs Support library:</a></dt>
      <dd>
        <ul>
          <li>Lowered the
          <a href="{@docRoot}guide/topics/manifest/uses-sdk-element.html"><code>minSdkVersion</code></a>
              value from 16 to 15 for version support.</li>
          <li>Added a way to generate a
            {@link android.support.customtabs.CustomTabsSessionToken} from an intent.</li>
         </ul>
       </dd>

    </dl>

  </div>
</div> <!-- end of collapsible section -->


<div class="toggle-content closed">
  <p id="rev23"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 23</a> <em>(August 2015)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
     <dt>Added new support libraries:</a></dt>
      <dd>
        <ul>
          <li><a href="features.html#custom-tabs">Custom Tabs Support library</a></li>
          <li><a href="features.html#percent">Percent Support library</a></li>
          <li><a href="features.html#recommendation">App Recommendation Support library for TV</a></li>
          <li><a href="features.html#v7-preference">v7 Preference Support library</a></li>
          <li><a href="features.html#v14-preference">v14 Preference Support library</a></li>
          <li><a href="features.html#v17-preference">v17 Preference Support library for TV</a></li>
         </ul>
       </dd>

    </dl>

    <p>For a complete list of the Support Library changes, see the
    <a href="{@docRoot}sdk/support_api_diff/23/changes.html">Support
    Library API Differences Report</a>.  </p>

  </div>
</div> <!-- end of collapsible section -->


<div class="toggle-content closed">
  <p id="rev22-2-1"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 22.2.1</a> <em>(July 2015)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for <a href="features.html#design">Design Support library:</a></dt>
      <dd>
        <ul>
          <li>Added the {@code hide()} and {@code show()} methods to the
            {@link android.support.design.widget.FloatingActionButton} class for programmatic
            triggering of animations.  </li>
          <li>Added the {@code LENGTH_INDEFINITE} constant to the
            {@link android.support.design.widget.Snackbar} class for showing a snackbar
            until it is dismissed or another snackbar is shown. Also, added the
            {@link android.support.design.widget.Snackbar#setActionTextColor(int)} and
            {@link android.support.design.widget.Snackbar#setActionTextColor(ColorStateList)}
            methods.  </li>
          <li>Added the {@code getSelectedTabPosition()} method to the
            {@link android.support.design.widget.TabLayout} class for retrieving the currently
            selected tab. </li>
          <li>Provided a fully fluent API for the
            {@link android.support.v7.app.NotificationCompat.MediaStyle} class for method
            chaining.  </li>
           <li>Added convenience methods to the
             {@link android.support.v7.widget.RecyclerView} for batch insertion of items. </li>
         </ul>
       </dd>
    </dl>

    <p>For a complete list of the Support Library changes, see the
    <a href="{@docRoot}sdk/support_api_diff/22.2.0/changes.html">Support
    Library API Differences Report</a>.  </p>

  </div>
</div> <!-- end of collapsible section -->


<div class="toggle-content closed">
  <p id="rev21"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 22.2.0</a> <em>(May 2015)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Added <a href="features.html#design">Design Support library:</a></dt>
      <dd>
        <ul>
          <li>Added {@link android.support.design.widget.TextInputLayout} for showing
            {@link android.widget.EditText} hint and error text as floating labels.
          </li>
          <li>Added {@link android.support.design.widget.FloatingActionButton} for implementing a
            primary action on your interface as a
            floating action button, supporting either default or mini sizes.
          </li>
          <li>Added {@link android.support.design.widget.Snackbar} for providing lightweight
            feedback with an optional action in an animated snackbar.
          </li>
          <li>Added {@link android.support.design.widget.TabLayout} for implementing fixed and
            scrollable
           <a href="{@docRoot}design/building-blocks/tabs.html">tabs</a> as well as easy
             integration with
             {@link android.support.v4.view.ViewPager}.
          </li>
          <li>Added {@link android.support.design.widget.NavigationView} for implementing
            <a href="{@docRoot}design/patterns/navigation-drawer.html">navigation drawer</a>
             contents, including the ability to inflate menu items via a
             <a href="{@docRoot}guide/topics/resources/menu-resource.html">Menu Resource</a>.
          </li>
          <li>Added {@link android.support.design.widget.CoordinatorLayout}, a general purpose
            layout, used for building dependencies between
            sibling views and allowing easy scrolling reactions between components via
            {@link android.support.design.widget.CoordinatorLayout.Behavior}. Many of the Design
            Library components rely on being a child of a
            {@link android.support.design.widget.CoordinatorLayout}.
          </li>
          <li>Added {@link android.support.design.widget.AppBarLayout}, a container for a
            {@link android.widget.Toolbar}
            and other views (such as {@link android.support.design.widget.TabLayout}) for
            reacting to scrolling events by scrolling off the screen, becoming visible in reaction
            to a downward scroll, or collapsing/uncollapsing before scrolling off/onto the screen.
          </li>
          <li>Added {@link android.support.design.widget.CollapsingToolbarLayout} for controlling
            how a {@link android.widget.Toolbar} collapses. A toolbar may collapse by:
            pinning components to the top of the screen while it collapses, introducing
            parallax scrolling of components such as an {@link android.widget.ImageView},
            or adding a content scrim color when the view is partially collapsed.
          </li>
       </ul>
      </dt>


      <dt>Changes for <a href="features.html#v4">v4 support library:</a></dt>
      <dd>
         <ul>

          <li>Added the
{@link android.support.v4.view.accessibility.AccessibilityEventCompat#getContentChangeTypes getContentChangeTypes()}
            and
{@link android.support.v4.view.accessibility.AccessibilityEventCompat#setContentChangeTypes setContentChangeTypes()}
            methods and related change type
            fields to the
            {@link android.support.v4.view.accessibility.AccessibilityEventCompat}
            class for accessibility event handling.
          </li>
          <li>Added the
{@link android.support.v4.media.session.PlaybackStateCompat#getActiveQueueItemId getActiveQueueItemId()},
{@link android.support.v4.media.session.PlaybackStateCompat#getCustomActions getCustomActions()},
            and
            {@link android.support.v4.media.session.PlaybackStateCompat#getExtras getExtras()}
            methods with related state fields to the
            {@link android.support.v4.media.session.PlaybackStateCompat} class for
            getting custom actions from the queue.
          </li>
          <li>Added the
{@link android.support.v4.media.session.PlaybackStateCompat.Builder#addCustomAction addCustomAction()},
{@link android.support.v4.media.session.PlaybackStateCompat.Builder#setActiveQueueItemId setActiveQueueItemId()},
            and
            {@link android.support.v4.media.session.PlaybackStateCompat.Builder#setExtras setExtras()}
            methods to the
            {@link android.support.v4.media.session.PlaybackStateCompat.Builder} class for adding
            custom actions to a playback state.
          </li>
          <li>Added the
{@link android.support.v4.media.session.PlaybackStateCompat.CustomAction#fromCustomAction fromCustomAction()} and
{@link android.support.v4.media.session.PlaybackStateCompat.CustomAction#getCustomAction getCustomAction()} methods
            to the
            {@link android.support.v4.media.session.PlaybackStateCompat.CustomAction} class
            for getting custom actions from the queue.
          </li>
          <li>Added the {@link android.support.v4.view.ViewCompat#isAttachedToWindow isAttachedToWindow()},
            {@link android.support.v4.view.ViewCompat#offsetLeftAndRight offsetLeftAndRight()}, and
            {@link android.support.v4.view.ViewCompat#offsetTopAndBottom offsetTopAndBottom()}
            methods to the {@link android.support.v4.view.ViewCompat} class for working with views.
          </li>
          <li>Added the {@link android.support.v4.view.ViewPager#addOnPageChangeListener addOnPageChangeListener()},
            {@link android.support.v4.view.ViewPager#clearOnPageChangeListeners clearOnPageChangeListeners()}, and
            {@link android.support.v4.view.ViewPager#removeOnPageChangeListener removeOnPageChangeListener()}
            methods to the {@link android.support.v4.view.ViewPager} class for responding to page
            changes.
            <p>Deprecated the
            {@link android.support.v4.view.ViewPager#setOnPageChangeListener setOnPageChangeListener()} method.</p>
          </li>
          <li>Added the
{@link android.support.v4.view.ViewParentCompat#notifySubtreeAccessibilityStateChanged notifySubtreeAccessibilityStateChanged()} method to
            the {@link android.support.v4.view.ViewParentCompat} class for notifying a view parent
            that the accessibility state of one of its descendants has changed.
          </li>
          <li>Added the {@link android.support.v4.view.ViewPropertyAnimatorCompat#translationZ translationZ()},
            {@link android.support.v4.view.ViewPropertyAnimatorCompat#translationZBy translationZBy()},
            {@link android.support.v4.view.ViewPropertyAnimatorCompat#z z()}, and
            {@link android.support.v4.view.ViewPropertyAnimatorCompat#zBy zBy()}
            methods to the {@link android.support.v4.view.ViewPropertyAnimatorCompat} class for
            adding animation.
          </li>
       </ul>
      </dd>


<dt>Changes for <a href="features.html#v7-appcompat">v7 appcompat library</a>:</dt>
      <dd>
<ul>
          <li>Added the
            {@link android.support.v7.app.AppCompatActivity#onWindowStartingSupportActionMode onWindowStartingSupportActionMode()}
            method to the
            {@link android.support.v7.app.AppCompatActivity},
            {@link android.support.v7.app.AppCompatCallback}, and
            {@link android.support.v7.app.AppCompatDialog} classes for handling action modes
            started from the current window.
          </li>

          <li>Added the
{@link android.support.v7.app.AppCompatDelegate#isHandleNativeActionModesEnabled isHandleNativeActionModesEnabled()} and
{@link android.support.v7.app.AppCompatDelegate#setHandleNativeActionModesEnabled setHandleNativeActionModesEnabled()}
           methods to the
           {@link android.support.v7.app.AppCompatDelegate} class for handling native action modes.
          </li>
       </ul>
      </dd>

    <p>For a complete list of the Support Library changes, see the
    <a href="{@docRoot}sdk/support_api_diff/22.2.0/changes.html">Support
    Library API Differences Report</a>.  </p>

    </dl>

  </div>
</div> <!-- end of collapsible section -->


<div class="toggle-content closed">
  <p id="rev21"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 22.1.0</a> <em>(April 2015)</em>
  </p>


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


  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for <a href="features.html#annotations">annotations library:</a></dt>
      <dd>
        <ul>
          <li>Added the Annotations library to provide support for enhanced code inspections.
            Annotations are added as metadata tags that you attach to variables, parameters,
            and return values to inspect method return values, passed parameters, and local
            variables and fields.
          </li>
        </ul>
      </dd>


      <dt>Changes for <a href="features.html#v4">v4 support library:</a></dt>
      <dd>
        <ul>

          <li>Added the {@link android.support.v4.graphics.ColorUtils ColorUtils} class
            to provide a set of color-related utility methods.
          </li>
          <li>Added the {@link android.support.v4.graphics.drawable.DrawableCompat#unwrap unwrap()} and
            {@link android.support.v4.graphics.drawable.DrawableCompat#wrap wrap()} methods to the
            {@link android.support.v4.graphics.drawable.DrawableCompat} class , allowing you to use
            {@link android.support.v4.graphics.drawable.DrawableCompat#setTint setTint()},
            {@link android.support.v4.graphics.drawable.DrawableCompat#setTintList setTintList()},
            and {@link android.support.v4.graphics.drawable.DrawableCompat#setTintMode setTintMode()}
            on all API level 4 or higher devices.
          </li>
          <li>Added the {@link android.support.v4.os.TraceCompat} class to
            write trace events to the system trace buffer, which can then be collected and
            visualized using the <a href="{@docRoot}tools/help/systrace.html">Systrace</a> tool.
          </li>
          <li>Added the {@link android.support.v4.util.CircularIntArray} class
            to create circular integer array data structures.
          </li>
          <li>Added the {@link android.support.v4.util.CircularArray#clear clear()},
            {@link android.support.v4.util.CircularArray#removeFromStart removeFromStart()},
            and {@link android.support.v4.util.CircularArray#removeFromEnd removeFromEnd()}
            methods to the {@link android.support.v4.util.CircularArray} class. Also, changed the
            existing methods in this class to be non-final.
          </li>
          <li>Added the {@link android.support.v4.view.InputDeviceCompat}
            as a helper class to access data in the
            {@link android.support.v4.view.InputDeviceCompat} class.
          </li>
          <li>Added the {@link android.support.v4.view.LayoutInflaterCompat}
            class as a helper class to access data in the
            {@link android.support.v4.view.LayoutInflaterCompat} class
            and added the {@link android.support.v4.view.LayoutInflaterFactory} interface.
          </li>
          <li>Added classes, methods, and interfaces to support nested scrolling.
             <ul>
               <li>Added the {@link android.support.v4.view.NestedScrollingChildHelper}
               and {@link android.support.v4.view.NestedScrollingParentHelper}
               helper classes for implementing nested scrolling parent and child views.</li>
               <li>Added the {@link android.support.v4.view.NestedScrollingChild}
               interface to be implemented by {@link android.view.View} subclasses.</li>
               <li>Added the {@link android.support.v4.view.NestedScrollingParent}
               and {@link android.support.v4.view.ScrollingView} interfaces to support
               scrolling operations and provide scroll related APIs.</li>
               <li>Added the
                {@link android.support.v4.view.ViewGroupCompat#getNestedScrollAxes
                getNestedScrollAxes()} method to the {@link android.support.v4.view.ViewGroupCompat}
                class.</li>
               <li>Added methods to the {@link android.support.v4.view.ViewParentCompat} class to
                support nested scrolling.
               </li>
               <li>Added the {@link android.support.v4.widget.NestedScrollView}
                 class to support nested scrolling parent and child on both new and old versions of
                 Android.
               </li>
              </ul>
          </li>
          <li>Added methods and constants to the {@link android.support.v4.view.MotionEventCompat}
            class for getting axis values and event source.
         </li>
         <li>Updated the {@link android.support.v4.view.accessibility.AccessibilityNodeInfoCompat}
          class to add methods for errors, content invalidation and labels.
         </li>
         <li>Added the following interpolation classes for animation:
           {@link android.support.v4.view.animation.FastOutLinearInInterpolator},
           {@link android.support.v4.view.animation.FastOutSlowInInterpolator},
           {@link android.support.v4.view.animation.LinearOutSlowInInterpolator},
           {@link android.support.v4.view.animation.LinearOutSlowInInterpolator}, and
           {@link android.support.v4.view.animation.PathInterpolatorCompat}.
         </li>
         <li>Added the {@link android.support.v4.widget.Space} class to create gaps between
           components in general purpose layouts. This class is deprecated in the gridlayout library.
         </li>
         <li>Added the {@link android.support.v4.widget.TextViewCompat} class for accessing
           features in a {@link android.widget.TextView}.
         </li>
         <li>Added a displacement parameter to the
           {@link android.support.v4.widget.EdgeEffectCompat#onPull onPull()} method in the
           {@link android.support.v4.widget.EdgeEffectCompat} class.
         </li>

       </ul>
      </dd>


  <dt>Changes for <a href="features.html#v7-appcompat">v7 appcompat library</a>:</dt>
      <dd>
        <ul>
          <li>Added tint support to appcompat widgets, including
            {@link android.support.v7.widget.AppCompatAutoCompleteTextView},
            {@link android.support.v7.widget.AppCompatButton},
            {@link android.support.v7.widget.AppCompatCheckBox},
            {@link android.support.v7.widget.AppCompatCheckedTextView},
            {@link android.support.v7.widget.AppCompatEditText},
            {@link android.support.v7.widget.AppCompatMultiAutoCompleteTextView},
            {@link android.support.v7.widget.AppCompatRadioButton},
            {@link android.support.v7.widget.AppCompatRatingBar},
            {@link android.support.v7.widget.AppCompatSpinner}, and
            {@link android.support.v7.widget.AppCompatTextView}.
          </li>
          <li>Updated the {@link android.support.v7.app.AppCompatActivity} as the base
            class for activities that use the support library action bar features. This class
            replaces the deprecated {@link android.support.v7.app.ActionBarActivity}.
          </li>
          <li>Added the
            {@link android.support.v7.app.AppCompatCallback} interface
            to be implemented for AppCompat to be able to perform callbacks.
          </li>
            <li>Added the
            {@link android.support.v7.app.AppCompatDelegate} abstract class
            as a delegate you can use to extend AppCompat's support to any activity.
          </li>
          <li>Added the
            {@link android.support.v7.app.AppCompatDialog} class
            as the base class for AppCompat themed dialogs.
          </li>
          <li>Added the spinner style
            {@link android.support.v7.app.AlertDialog} and
            {@link android.support.v7.app.AlertDialog.Builder} classes to provide an AppCompat
            themed {@link android.app.AlertDialog}.
          </li>
          <li>Added the {@link android.support.v7.graphics.Palette.Builder} class
            for generating {@link android.support.v7.graphics.Palette} instances.
            <ul>
              <li>Added the
                {@link android.support.v7.graphics.Palette#from}
                method to the {@link android.support.v7.graphics.Palette} class to
                start generating a Palette with the returned
                {@link android.support.v7.graphics.Palette.Builder} instance.
              </li>
              <li>Deprecated the {@link android.support.v7.graphics.Palette#generate generate()} and
                {@link android.support.v7.graphics.Palette#generateAsync generateAsync()} methods.
              </li>
             </ul>
           </li>

           <li>Added the
             {@link android.support.v7.widget.GridLayout.Spec#getAbsoluteAlignment
             getAbsoluteAlignment()} method to the {@link android.support.v7.widget.GridLayout.Spec}
             class.
           </li>
           <li>Deprecated use of <code>app:theme</code> for styling
             {@link android.support.v7.widget.Toolbar}. You can now use
             <code>android:theme</code> for toolbars on all API level 7 and higher devices and
             <code>android:theme</code> support for all widgets on API level 11 and higher devices.
           </li>
        </ul>
      </dd>


      <dt>Changes for <a href="features.html#v17-leanback">v17 leanback library</a>:</dt>
      <dd>
        <ul>
          <li> Added {@link android.support.v17.leanback.app.GuidedStepFragment},
            {@link android.support.v17.leanback.widget.GuidanceStylist} and
            {@link android.support.v17.leanback.widget.GuidedActionsStylist} to support
            creating multi-step decision flows.
          </li>
        </ul>
      </dd>


      <dt>Changes for <a href="features.html#v7-recyclerview">v7 recyclerview library</a>:</dt>
      <dd>
        <ul>
           <li>Added {@link android.support.v7.util.SortedList} classes to display items in
             a list order and provide notification of changes to the list.
           </li>
           <li>Added the {@link android.support.v7.widget.util.SortedListAdapterCallback} class
             that can bind a sorted list to a
             {@link android.support.v7.widget.RecyclerView.Adapter} class.
           </li>
        </ul>
      </dd>


      <dt>Changes for <a href="features.html#v8-renderscript">v8 renderscript library</a>:</dt>
      <dd>
        <ul>
          <li>Added the {@link android.support.v8.renderscript.ScriptIntrinsicHistogram} class for
            use as a histogram filter.</li>
          <li>Added the {@link android.support.v8.renderscript.ScriptIntrinsicResize} class for
            performing a resize of a 2D allocation.
          </li>
        </ul>
      </dd>

    </dl>


  </div>
</div> <!-- end of collapsible section -->


<div class="toggle-content closed">
  <p id="rev21"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 22</a> <em>(March 2015)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for <a href="features.html#v4">v4 support library:</a></dt>
      <dd>
        <ul>
          <li>Updated the {@link android.support.v4.content.res.ResourcesCompat#getDrawable
            getDrawable()} method to return a drawable object for a specified specific resource ID,
            screen density, and theme.
          </li>
          <li>Added the {@link android.support.v4.view.ViewCompat#setImportantForAccessibility
            setImportantForAccessibility()} method so you can indicate if a view should trigger
            accessibility events.
          </li>
          <li>Added the {@link android.support.v4.widget.DrawerLayout#getStatusBarBackgroundDrawable
            getStatusBarBackgroundDrawable()} method so you can get the status bar background
            drawable.
          </li>
          <li>Added methods to the
            {@link android.support.v4.app.NotificationCompat.CarExtender.UnreadConversation}
            class so Android Auto messaging apps can retrieve additional notification data.
          </li>
          <li>Added the {@link android.support.v4.widget.SwipeRefreshLayout#getProgressCircleDiameter
            getProgressCircleDiameter()} method to return the diameter of a circle layout.
          </li>
          <li>Changed the default {@link android.support.v4.widget.DrawerLayout DrawerLayout}
            status bar color to {@link android.R.attr#colorPrimaryDark}.
          </li>
        </ul>
      </dd>

      <dt>Changes for <a href="features.html#v7-appcompat">v7 appcompat library</a>:</dt>
      <dd>
        <ul>
          <li>Added the spinner style
            {@link android.support.v7.appcompat.R.style#Base_Widget_AppCompat_Spinner_Underlined}.</li>
          <li>Added tinted widgets styles with
            {@link android.support.v7.appcompat.R.style#Widget_AppCompat_AutoCompleteTextView},
            {@link android.widget.MultiAutoCompleteTextView},
            {@link android.support.v7.appcompat.R.style#TextAppearance_AppCompat_Button}, and
            {@link android.support.v7.appcompat.R.style#Base_Widget_AppCompat_RatingBar}.</li>
        </ul>
      </dd>

      <dt>Changes for <a href="features.html#v17-leanback">v17 leanback library</a>:</dt>
      <dd>
        <ul>
          <li>Added the {@link android.support.v17.leanback.widget.ListRowPresenter#getRecycledPoolSize
            getRecycledPoolSize()} and
            {@link android.support.v17.leanback.widget.ListRowPresenter#setRecycledPoolSize
            setRecycledPoolSize()} methods to allow customized recycled pool sizes.</li>
          <li>Added the {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} attribute to the
            layout width setting to support wrapped content for title icons.</li>
          <li>Defined {@link android.support.v17.leanback.R.transition} in XML to
            improve transition updates.  </li>
          <li>Enabled support for right to left layouts.</li>
          <li>Added the play and pause media key events support to the
            {@link android.support.v17.leanback.app.PlaybackOverlayFragment} class.</li>
          <li>Added enter and return transitions to the
            {@link android.support.v17.leanback.app.BrowseFragment} class and the
            {@link android.support.v17.leanback.app.DetailsFragment} class.</li>
          <li>Added the {@link android.support.v17.leanback.widget.ArrayObjectAdapter#replace
            replace()} method to replace items in an object’s adapter array. </li>
        </ul>
      </dd>


      <dt>Changes for <a href="features.html#v7-mediarouter">v7 mediarouter library</a>:</dt>
      <dd>
        <ul>
          <li>Updated Google Cast icons to use the
            <a href="{@docRoot}training/material/index.html">material design</a> style.</li>
          <li>Updated all the icons used in the {@link android.media.MediaRouter} dialogs to use the
            <a href="{@docRoot}training/material/index.html">material design</a> style.</li>
        </ul>
      </dd>


      <dt>Changes for <a href="features.html#v7-recyclerview">v7 recyclerview library</a>:</dt>
      <dd>
        <ul>
          <li>Added the {@link android.support.v7.widget.RecyclerView.ViewHolder#getLayoutPosition
            getlayoutPosition()}
            and {@link android.support.v7.widget.RecyclerView.ViewHolder#getAdapterPosition
            getadapterPosition()} methods to the {@link android.support.v7.widget.RecyclerView}
            class.</li>
          <li>Deprecated the <code>classgetChildPosition()</code> and
            <code>findViewHolderForPosition()</code> methods in the
            {@link android.support.v7.widget.RecyclerView} class. </li>
          <li>Deprecated the <code>getPosition()</code> method in the
            {@link android.support.v7.widget.RecyclerView.ViewHolder} class. </li>
          <li>Deprecated the <code>getViewPosition()</code> method in the
            {@link android.support.v7.widget.RecyclerView.LayoutParams} class. </li>
        </ul>
      </dd>

  </div>
</div>


<div class="toggle-content closed">
  <p id="rev21"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 21.0.3</a> <em>(December 2014)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for <a href="features.html#v4">v4 support library:</a></dt>
      <dd>
        <ul>
          <li>Added several {@link android.support.v4.app.NotificationCompat.WearableExtender}
          methods to improve the display of barcodes in notifications on wearable devices.
             <ul>
             <li>{@link android.support.v4.app.NotificationCompat.WearableExtender#getHintScreenTimeout getHintScreenTimeout()}</li>
             <li>{@link android.support.v4.app.NotificationCompat.WearableExtender#setHintScreenTimeout setHintScreenTimeout()}</li>
             <li>{@link android.support.v4.app.NotificationCompat.WearableExtender#getHintAvoidBackgroundClipping getHintAvoidBackgroundClipping()}</li>
             <li>{@link android.support.v4.app.NotificationCompat.WearableExtender#setHintAvoidBackgroundClipping setHintAvoidBackgroundClipping()}</li>
             </ul>
          </li>
        </ul>
      </dd>

  </div>
</div>


<div class="toggle-content closed">
  <p id="rev21"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 21.0.2</a> <em>(November 2014)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for <a href="features.html#v4">v4 support library:</a></dt>
      <dd>
        <ul>
          <li>Added {@link android.support.v4.app.NotificationCompat.CarExtender}
          class to support Android Auto extensions to notifications.</li>
        </ul>
      </dd>
      <dt>Changes for <a href="features.html#v7-appcompat">v7 appcompat library</a>:</dt>
      <dd>
        <ul>
          <li>Added the {@link android.support.v7.widget.PopupMenu} constructor to support new popup
          menus.</li>
          <li>Added support for a Collapse icon description in the {@link android.support.v7.widget.Toolbar}
          class.</li>
          <li>Updated the {@link android.support.v7.widget.SearchView} widget to support displaying
          the {@link android.support.v7.appcompat.R.attr#commitIcon}. </li>
          <li>Removed the <code>buttonGravity</code> attribute from the
          {@link android.support.v7.widget.Toolbar} class. </li>
        </ul>
      </dd>
      <dt>Changes for <a href="features.html#v7-cardview">v7 cardview library</a>:</dt>
      <dd>
        <ul>
          <li>Added {@link android.support.v7.widget.CardView#setCardBackgroundColor} API to
          support changing the background color of the {@link android.support.v7.widget.CardView}.</li>
          <li>Changed the {@link android.support.v7.widget.CardView} to more accurately report its
          opacity value as {@link android.graphics.PixelFormat#TRANSLUCENT}.</li>
        </ul>
      </dd>
      <dt>Changes for <a href="features.html#v7-recyclerview">v7 recyclerview
        library</a>:</dt>
      <dd>
        <ul>
          <li>Added {@link android.support.v7.widget.RecyclerView#TOUCH_SLOP_DEFAULT} and
          {@link android.support.v7.widget.RecyclerView#TOUCH_SLOP_PAGING} constants
          to the {@link android.support.v7.widget.RecyclerView} class
          to support touch slop configurations for paging.</li>
        </ul>
      </dd>
      <dt>Changes for <a href="features.html#v17-leanback">v17 leanback library</a>:</dt>
      <dd>
        <ul>
          <li>Added support to generate v4 code fragments. </li>
          <li>Changed the secondary text color on {@link android.support.v7.widget.CardView}. </li>
        </ul>
      </dd>
    </dl>
  </div>
</div>


<div class="toggle-content closed">
  <p id="rev21"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 21.0.1</a> <em>(November 2014)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Added <a href="{@docRoot}tools/support-library/features.html#multidex">
      multidex support library</a> to support multiple
      <a href="https://source.android.com/devices/tech/dalvik/">Dalvik</a> Executable (DEX) files
      for multi-dex file support prior to Android 5.0.
      </dt>
    </dl>
  </div>
</div>


<div class="toggle-content closed">
  <p id="rev21"><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 21</a> <em>(October 2014)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for <a href="features.html#v4">v4 support library:</a></dt>
      <dd>
        <ul>
          <li>Added support for {@link android.support.v4.app.Fragment}
              transitions for devices running Android 5.0 (API level 21).
              Be aware that transitions have no effect on devices running
              Android 4.4 and lower.
          </li>
          <li>Added {@link android.support.v4.provider.DocumentFile} to ease
              the transition from {@link java.io.File}
              while working with document trees. However, this class demands
              more processing overhead compared to the platform's
              {@link android.provider.DocumentsContract} API added in
              Android 4.4 (API level 19). So you should switch to using {@link
              android.provider.DocumentsContract} when running on Android 4.4
              and higher.</li>
        </ul>
      </dd>
      <dt>Changes for <a href="features.html#v7-appcompat">v7 appcompat
        library</a>:</dt>
      <dd>
        <ul>
          <li>Added support for <a href="{@docRoot}design/material/">material
              design</a> user interfaces.</li>
          <li>Added {@link android.support.v7.widget.Toolbar}, which generalizes
              the functionality of {@link android.support.v7.app.ActionBar} for
              use within app layouts.</li>
          <li>Updated {@link android.support.v7.app.ActionBarDrawerToggle},
              which contains the menu-to-arrow animation</li>
          <li>Updated common user interface widgets to allow tinting via theme
              attributes when running on pre-Android 5.0 devices</li>
          <li>Added {@link android.support.v7.widget.SwitchCompat}, a backport
              of the {@link android.widget.Switch} widget that was added in
              Android 4.0 (API level 14).</li>
        </ul>
      </dd>
      <dt>New <a href="features.html#v7-cardview">v7 cardview library</a>:</dt>
      <dd>
        <ul>
          <li>Added the {@link android.support.v7.widget.CardView} widget, which
            provides a material design-compatible implementation for displaying
            data items.</li>
        </ul>
      </dd>
      <dt>New <a href="features.html#v7-recyclerview">v7 recyclerview
        library</a>:</dt>
      <dd>
        <ul>
          <li>Added the {@link android.support.v7.widget.RecyclerView} widget,
            which provides a flexible list view for providing a limited window
            into a large data set.</li>
        </ul>
      </dd>
      <dt>New <a href="features.html#v7-palette">v7 palette library</a>:</dt>
      <dd>
        <ul>
          <li>Added {@link android.support.v7.graphics.Palette} class,
          which lets you extract prominent colors from an image.</li>
        </ul>
      </dd>
      <dt>New <a href="features.html#v17-leanback">v17 leanback library</a>:</dt>
      <dd>
        <ul>
          <li>Added support for building TV user interfaces, including
            {@link android.support.v17.leanback.app.BrowseFragment},
            {@link android.support.v17.leanback.app.DetailsFragment}, and
            {@link android.support.v17.leanback.app.PlaybackOverlayFragment}.
            For more information about using these user interface widgets,
            see <a href="{@docRoot}training/tv/playback/index.html">Building TV
            Playback Apps</a>.</li>
        </ul>
      </dd>
    </dl>
  </div>
</div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 20</a> <em>(July 2014)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Added extended notification support for Android Wear in
            {@link android.support.v4.app.NotificationCompat.WearableExtender}, which allows you
            to specify wearable-specific features in your notifications.</li>
          <li>Added {@link android.support.v4.app.NotificationCompat.Action.WearableExtender},
            which allows actions to be added on wearable notifications.</li>
          <li>Added {@link android.support.v4.app.NotificationManagerCompat}, which allows you
            to issue notifications that properly support wearable features.</li>
          <li>Added {@link android.support.v4.app.RemoteInput}, which allows a handheld device
            to receive voice input from a notification that appears on a wearable device.</li>
          <li>Improved the handling of touch feedback in
            {@link android.support.v4.widget.SwipeRefreshLayout}.</li>
        </ul>
      </dd>
    </dl>
  </div>
</div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 19.1.0</a> <em>(March 2014)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Added the {@link android.support.v4.widget.SwipeRefreshLayout} class,
              which enables users to refresh the contents of a view with a vertical
              swipe gesture.</li>
          <li>Fixed accessibility issues with navigation drawers.</li>
        </ul>
      </dd>

      <dt>Changes for v7 appcompat library:</dt>
      <dd>
        <ul>
          <li>Fixed background issues with the action bar.</li>
        </ul>
      </dd>
    </dl>
  </div>
</div>

<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 19.0.1</a> <em>(December 2013)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Improved {@link android.support.v4.print.PrintHelper} by adding asynchronous
            handling of printing.</li>
          <li>Fixed the {@link android.support.v4.widget.DrawerLayout} class approximation of
            the {@link android.view.View#addChildrenForAccessibility addChildrenForAccessibility()}
            method.</li>
          <li>Fixed slide drawable mirroring in {@link
            android.support.v4.app.ActionBarDrawerToggle}.</li>
          <li>Fixed off-by-one issue when removing an item from a collection iterator.</li>
        </ul>
      </dd>

      <dt>Changes for v7 mediarouter library:</dt>
      <dd>
        <ul>
          <li>Improved route identification by using full component name in the {@link
            android.support.v7.media.MediaRouteProvider.ProviderMetadata}.</li>
          <li>Updated {@link android.support.v7.app.MediaRouteChooserDialog} to hide disabled
            routes.</li>
        </ul>
      </dd>

      <dt>Changes for <a href="features.html#v8-renderscript">v8 renderscript library</a></dt>
      <dd>
        <ul>
          <li>Added error propagation for the RenderScript thunking layer.</li>
        </ul>
      </dd>

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


<div class="toggle-content closed">
  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 19</a> <em>(October 2013)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Added support for external Storage APIs with the
            {@link android.support.v4.content.ContextCompat#getObbDirs getObbDirs()},
            {@link android.support.v4.content.ContextCompat#getExternalFilesDirs getExternalFilesDirs()},
            {@link android.support.v4.content.ContextCompat#getExternalCacheDirs getExternalCacheDirs()},
            and {@link android.support.v4.os.EnvironmentCompat#getStorageState getStorageState()}.
            These helper methods always return a single file object on devices running Android
            4.3 (API level 18) and earlier. When running on Android 4.4 (API level 19) and higher,
            these methods may return more than one file object.</li>
          <li>Added {@link android.support.v4.print.PrintHelper} class that works with the
            Print APIs to print images with a minimum of code.</li>
          <li>Added drag-to-open user interface support for pop-up menus. For more information, see
            {@link android.support.v4.widget.PopupMenuCompat} and
            {@link android.support.v4.widget.ListPopupWindowCompat}.</li>
          <li>Improved accessibility support with the addition of a
            {@link android.support.v4.view.accessibility.AccessibilityNodeProviderCompat#findFocus
            findFocus()} method in
            {@link android.support.v4.view.accessibility.AccessibilityNodeProviderCompat} and the
            {@link android.support.v4.view.accessibility.AccessibilityNodeInfoCompat#getLiveRegion
            getLiveRegion()} method in
            {@link android.support.v4.view.accessibility.AccessibilityNodeInfoCompat}.</li>
          <li>Added helper class {@link android.support.v4.view.ScaleGestureDetectorCompat} for
            accessing new scaling gesture methods.</li>
          <li>Fixed problem with {@link android.support.v4.app.ActionBarDrawerToggle} in
            right-to-left language displays.</li>
          <li>Modified {@link android.support.v4.widget.AutoScrollHelper} option to consume
            touch events or allow them to be passed through to other views.</li>
        </ul>
      </dd>

      <dt>Changes for v7 mediarouter library:</dt>
      <dd>
        <ul>
          <li>Added support for media playback queuing, setting HTTP header values and media
            playback duration.</li>
          <li>Added explicit start, get, and end session actions for explicitly managing media
            playback sessions with media router.</li>
        </ul>
      </dd>
    </dl>
  </div>
</div>

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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 18</a> <em>(July 2013)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
      <ul>
        <li>User interface
          <ul>
            <li>Added {@link android.support.v4.text.BidiFormatter} for handling
              text strings that combine right to left and left to right-formatted text.</li>
            <li>Modified {@link android.support.v4.view.ViewPager} to better handle cases where the
              pager has a measured width of zero in the initial layout processing.</li>
            <li>Modified {@link android.support.v4.widget.DrawerLayout} and
              {@link android.support.v4.widget.SlidingPaneLayout} to not throw exceptions for
              measurement while the project code is being edited.</li>
          </ul>
        </li>

        <li>Accessibility
          <ul>
            <li>Added {@link android.support.v4.widget.ExploreByTouchHelper} to simplify the
              implementation of accessibility for custom views.</li>
            <li>Fixed a problem with {@link android.support.v4.view.ViewPager} incorrectly
              populating {@link
              android.support.v4.view.accessibility.AccessibilityEventCompat#TYPE_VIEW_SCROLLED
              TYPE_VIEW_SCROLLED} accessibility events.</li>
            <li>Fixed a null pointer exception in {@link android.support.v4.view.ViewPager} when
              populating an accessibility event.</li>
            <li>Simplified {@link android.support.v4.view.accessibility.AccessibilityNodeInfoCompat}
              by changing {@link java.lang.CharSequence} inputs to {@link java.lang.String} objects.
              </li>
            <li>Deprecated an {@link android.support.v4.view.accessibility.AccessibilityRecordCompat}
              constructor that used an {@link java.lang.Object} as input.</li>
          </ul>
        </li>

        <li>Media
          <ul>
            <li>Added {@link android.support.v4.media.TransportMediator} helper class to manage
              media transport control, such as play, pause, skip and other media actions.</li>
            <li>Added {@link android.support.v4.hardware.display.DisplayManagerCompat} for managing
              display output to one or more device displays.</li>
          </ul>
        </li>

        <li>Other changes
        <ul>
            <li>Added {@link android.support.v4.content.WakefulBroadcastReceiver} helper class for
              implementing a common pattern of detecting a device wakeup event and passing work off
              to a {@link android.app.Service} while ensuring that the device does not go back to
              sleep before the handoff is complete.</li>
            <li>Added two new APIs,
              {@link android.support.v4.content.AsyncTaskLoader#commitContentChanged
              commitContentChanged()} and
              {@link android.support.v4.content.AsyncTaskLoader#rollbackContentChanged
              rollbackContentChanged()}, to {@link android.support.v4.content.AsyncTaskLoader} to
              help deal with background updates for data changes that are subsequently canceled.
              </li>
          </ul>
        </li>
      </ul>
      </dd>

      <dt>New v7 appcompat library:</dt>
      <dd>
        <ul>
          <li>Added {@link android.support.v7.app.ActionBar} to allow implementation of the
            action bar user interface <a href="{@docRoot}design/patterns/actionbar.html">design
            pattern</a> back to Android 2.1 (API level 7) and higher. Use of this class requires
            that you implement your activity by extending the new
            {@link android.support.v7.app.ActionBarActivity} class.</li>
        </ul>
      </dd>

      <dt>New v7 mediarouter library:</dt>
      <dd>
        <p>Added a new mediarouter library that provides support for the <a
        href="https://developers.google.com/cast/">Google Cast developer preview</a>.
        The v7 mediarouter library APIs provide a means of controlling the routing of
        media channels and streams from the current device to external screens,
        speakers, and other destination devices, with compatibility back to Android 2.1
        (API level 7). See <a
        href="{@docRoot}tools/support-library/features.html#v7-mediarouter">V7
        mediarouter library</a> for more information. </p>

        <p class="caution">The v7 mediarouter library APIs introduced in Support
        Library r18 are subject to change in later revisions of the Support
        Library. At this time, we recommend using the library only in connection
        with the <a href="https://developers.google.com/cast/">Google Cast
        developer preview</a>.</p>
      </dd>

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


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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 13</a> <em>(May 2013)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Added {@link android.support.v4.widget.DrawerLayout} for creating a
            <a href="{@docRoot}training/implementing-navigation/nav-drawer.html">Navigation
            Drawer</a> that can be pulled in from the edge of a window.</li>
          <li>Added {@link android.support.v4.widget.SlidingPaneLayout} widget for creating linked
            summary and detail views that appropriately adapt to various screen sizes.</li>
          <li>Added {@link android.support.v4.app.ActionBarDrawerToggle} as a way to tie
            together the functions of {@link android.support.v4.widget.DrawerLayout} and {@link
            android.app.ActionBar}.</li>
          <li>Added {@link android.support.v4.widget.ViewDragHelper} as a new common component
            for dragging views within a parent view.</li>
          <li>Added {@link android.support.v4.widget.ScrollerCompat} to provide {@link
            android.widget.Scroller} and {@link android.widget.OverScroller} compatibility support.
            </li>
          <li>Added {@link android.support.v4.content.FileProvider} to allow sharing of private
            files between applications.</li>
          <li>Updated {@link android.support.v4.view.ViewPager} to throw an exception if the
            associated {@link android.support.v4.view.PagerAdapter} class is modified without a
            call to {@link android.support.v4.view.PagerAdapter#notifyDataSetChanged
            notifyDataSetChanged()}.
            </li>
          <li>Fixed an issue with {@link android.support.v4.view.ViewPager} children drawing sort
            order.</li>
          <li>Fixed {@link android.support.v4.view.GestureDetectorCompat} to dispatch missing
            {@link android.view.GestureDetector.SimpleOnGestureListener#onSingleTapConfirmed} calls
            between tap timeout and long press events.</li>
        </ul>
      </dd>

      <dt>New v7 gridlayout library:</dt>
      <dd>
        <ul>
          <li>Added {@link android.support.v7.widget.GridLayout} to provide support for the
            {@link android.widget.GridLayout} layout object.</li>
          <li>Added {@link android.support.v7.widget.Space} which can be used to create blank areas
            within a {@link android.support.v7.widget.GridLayout} layout object.</li>
        </ul>
    </dl>
  </div>
</div>


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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 12</a> <em>(February 2013)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Improved interaction behavior for {@link android.support.v4.view.ViewPager}.</li>
          <li>Fixed a bug that could cause {@link android.support.v4.view.ViewPager} to select the
            wrong page.</li>
          <li>Fixed use of {@link android.support.v4.view.ViewPager#removeView removeView()} method
            during layout for {@link android.support.v4.view.ViewPager}.</li>
          <li>Fixed issue with {@link android.support.v4.widget.SearchViewCompat} where using the
            back button to dismiss does not clear the search text. This fix only applies to
            host API levels 14 and higher.</li>
        </ul>
      </dd>
    </dl>
  </div>
</div>


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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 11</a> <em>(November 2012)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>User Interface
            <ul>
              <li>Added support for nested {@link android.support.v4.app.Fragment} classes.</li>
              <li>Added improvements to {@link android.support.v4.app.FragmentManager} debugging.
                </li>
              <li>Fixed problem in {@link android.support.v4.app.FragmentTabHost} where fragment
                and tab interaction could result in a {@link android.widget.ListView} state loss.
                </li>
              <li>Fixed issue with user-visible hint in
                {@link android.support.v4.app.FragmentStatePagerAdapter}.</li>
              <li>Added {@link android.support.v4.view.ViewPager.PageTransformer PageTransformer}
                interface to {@link android.support.v4.view.ViewPager} to allow applications to
                supply a custom transition behavior for scrolling.</li>
              <li>Added new features and fixes to {@link android.support.v4.app.TaskStackBuilder}
                from current release.</li>
              <li>Fixed {@link android.support.v4.view.PagerTitleStrip} to correctly track the
                {@link android.support.v4.view.PagerAdapter} currently in use.</li>
              <li>Fixed display flickering, positioning, and text clipping problems with
                {@link android.support.v4.view.PagerTitleStrip}.</li>
              <li>Fixed {@link android.support.v4.view.PagerTabStrip} to properly respect padding
                when drawing an underline.</li>
            </ul>
          </li>
          <li>Accessibility
            <ul>
              <li>Added support for new accessibility gesture and touch event types in
                {@link android.support.v4.view.accessibility.AccessibilityEventCompat}.</li>
              <li>Added support for new accessibility APIs in
                {@link android.support.v4.view.ViewCompat}.</li>
              <li>Added support for {@link android.support.v4.view.ViewCompat#performAccessibilityAction
                performAccessibilityAction()} method to {@link android.support.v4.view.ViewCompat}.
                </li>
            </ul>
          </li>
          <li>Added support for gestures with {@link android.support.v4.view.GestureDetectorCompat}.
            </li>
          <li>Added support for performing atomic operations on files using a new
            {@link android.support.v4.util.AtomicFile} class.</li>
          <li>Added support for the full set of {@code make} methods in
            {@link android.support.v4.content.IntentCompat}.</li>
          <li>Added {@link android.support.v4.util.LruCache#trimToSize trimToSize()} method in
            {@link android.support.v4.util.LruCache} utility class.</li>
          <li>Updated {@link android.support.v4.net.ConnectivityManagerCompat} to get NetworkInfo
            from a {@link android.net.ConnectivityManager#CONNECTIVITY_ACTION}
            broadcast.</li>
        </ul>
      </dd>
    </dl>
  </div>
</div>


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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 10</a> <em>(August 2012)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Added support for notification features introduced in Android 4.1 (API level 16) with
          additions to {@link android.support.v4.app.NotificationCompat}.</li>
        </ul>
      </dd>
    </dl>
  </div>
</div>


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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 9</a> <em>(June 2012)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>

          <li>User Interface Support
            <ul>
              <li>Added {@link android.support.v4.view.PagerTabStrip} support, providing enhanced
functionality beyond {@link android.support.v4.view.PagerTitleStrip}.</li>
              <li>Fixed various bugs for {@link android.support.v4.view.PagerTitleStrip} and
{@link android.support.v4.view.PagerTabStrip}, including {@link
android.widget.TextView#setAllCaps setAllCaps} option, title alignment,
appearance improvements, minimum width constraints and touch navigation issues.</li>
              <li>Added support for {@link android.support.v4.view.ViewPager} page gutters, which
helps the {@link android.support.v4.view.ViewPager} class provide paging support for content with
a large horizontal scroll range, such as a map.</li>
              <li>Fixed numerous bugs for {@link android.support.v4.view.ViewPager}, including size
and data set change problems, page positioning, user interaction, scroll tracking and keyboard
navigation problems.</li>
              <li>Fixed many bugs for {@link android.support.v4.app.Fragment}, including proper
handling of {@link android.support.v4.app.Fragment#onActivityResult onActivityResult()} when
the target fragment no longer exists, dispatching selection events to invisible fragments, improved
{@link android.support.v4.app.FragmentTransaction#replace FragmentTransaction.replace()} behavior
and added better state handling for fragments being moved out of view.</li>
              <li>Added support for the {@link
android.support.v4.view.ViewCompat postOnAnimation()} method in {@link
android.support.v4.view.ViewCompat}.</li>
              <li>Updated {@link android.support.v4.app.NavUtils} to use Android 4.1 (API level 16)
<em>Up</em> navigation functionality when available.</li>
            </ul>
          </li>

          <li>Accessibility
            <ul>
              <li>Updated accessibility support classes, including {@link
android.support.v4.view.accessibility.AccessibilityNodeInfoCompat}, to follow fixes made in Android
4.1 (API level 16).</li>
              <li>Added support for accessibility scroll actions in {@link
android.support.v4.view.ViewPager}.</li>
            </ul>
          </li>

          <li>General improvements
            <ul>
              <li>Updated {@link android.support.v4.app.TaskStackBuilder} to reflect API changes in
Android 4.1 (API level 16).</li>
              <li>Enhanced {@link android.support.v4.app.TaskStackBuilder} to allow it to be used
from a Service.</li>
              <li>Added support for {@link android.support.v4.content.IntentCompat EXTRA_HTML_TEXT}
to {@link android.support.v4.app.ShareCompat}.</li>
              <li>Updated {@link android.support.v4.app.NotificationCompat.Builder} to support the
{@link android.support.v4.app.NotificationCompat.Builder#setNumber setNumber()} method.</li>
              <li>Added support in {@link android.support.v4.net.ConnectivityManagerCompat} for the
{@link android.support.v4.net.ConnectivityManagerCompat#isActiveNetworkMetered
isActiveNetworkMetered()} method.</li>
            </ul>
          </li>
        </ul>
      </dd>
    </dl>
  </div>
</div>


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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 8</a> <em>(April 2012)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Fixed intent flags for {@link android.app.PendingIntent} objects generated
            by {@link android.support.v4.app.TaskStackBuilder}.</li>
          <li>Removed unused attributes from the gridlayout library projects to make sure
            the library can be built with API level 7 and higher.</li>
          <li>Added {@code .classpath} and {@code .project} files for the gridlayout
            library project.</li>
        </ul>
      </dd>
    </dl>
  </div>
</div>


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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 7</a> <em>(March 2012)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Added {@link android.support.v4.app.ShareCompat}, which provides helper classes
for sending and receiving content for social sharing applications, including new metadata for
attributing shared data to the source app. This class also provides compatible integration with the
new {@link android.widget.ShareActionProvider} in Android 4.0.</li>
          <li>Added {@link android.support.v4.app.NavUtils} and {@link
android.support.v4.app.TaskStackBuilder} to provide support for implementing the
<a href="{@docRoot}design/index.html">Android Design</a> guidelines for navigation. These
additions include a way to implement the action bar's <em>Up</em> button across versions.
For an example implementation of this pattern, see the AppNavigation sample in
(<code><em>&lt;sdk&gt;</em>/samples/<em>&lt;platform&gt;</em>/AppNavigation</code>).</li>
          <li>Added {@link android.support.v4.app.NotificationCompat.Builder} to provide a
compatibility implementation of Android 3.0's {@link android.app.Notification.Builder} helper class
for creating standardized system notifications.</li>
        </ul>
      </dd>
    </dl>
  </div>
</div>


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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 6</a> <em>(December 2011)</em>
  </p>
  <div class="toggle-content-toggleme">

    <p class="note"><strong>Note:</strong> Reference for support library APIs are now available with
    the framework references, for example: {@link android.support.v4.app}.</p>
<dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Changes to ViewPager:
            <ul>
              <li>Added extra decorative view support for {@link android.support.v4.view.ViewPager}.
                Decorative views may be supplied as child views of a pager in XML layout.</li>
              <li>Added {@link android.support.v4.view.PagerAdapter#getPageTitle
                PagerAdapter.getPageTitle()} to supply title strings for pages, which defaults to no
                title for each page.</li>
              <li>Added {@link android.support.v4.view.PagerTitleStrip}, a non-interactive title
                strip, that can be added as a child of ViewPager. Developers can supply text
                appearance and color, as well as layout sizing and gravity information.</li>
              <li>Updated {@link android.support.v4.view.PagerAdapter} methods to take ViewGroup
                objects, rather than View to avoid class casting in adapter implementations.</li>
              <li>Updated {@link android.support.v4.view.ViewPager} to use Launcher-style
                fling behavior.</li>
              <li>Bug fixes for user interface interaction and test automation.</li>
            </ul>
          </li>

          <li>Support for Fragments:
            <ul>
              <li>Changed {@code setStartDeferred()} method to {@link
                android.support.v4.app.Fragment#setUserVisibleHint}.</li>
              <li>Added deferred start for off-screen pages to improve performance.</li>
            </ul>
          </li>

          <li>Support for Accessiblity APIs:
            <ul>
              <li>Updated {@link android.support.v4.view.AccessibilityDelegateCompat} methods
                to return empty lists instead of null.</li>
              <li>Added new APIs needed by the v4 samples.</li>
            </ul>
          </li>

        </ul>
      </dd>
    </dl>
  </div>
</div>

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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 5</a> <em>(December 2011)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <li>Support for Accessiblity APIs:
            <ul>
              <li>Added {@link android.support.v4.view.AccessibilityDelegateCompat}
              to support {@link android.view.View.AccessibilityDelegate}.</li>

              <li>Added {@link android.support.v4.view.accessibility.AccessibilityEventCompat}
              to support {@link android.view.accessibility.AccessibilityEvent}.</li>

              <li>Added {@link android.support.v4.view.accessibility.AccessibilityManagerCompat}
              to support {@link android.view.accessibility.AccessibilityManager}.</li>

              <li>Added {@link android.support.v4.view.accessibility.AccessibilityNodeInfoCompat}
              to support {@link android.view.accessibility.AccessibilityNodeInfo}.</li>

              <li>Added {@link android.support.v4.view.accessibility.AccessibilityRecordCompat}
              to support {@link android.view.accessibility.AccessibilityRecord}.</li>

              <li>Added {@link
              android.support.v4.accessibilityservice.AccessibilityServiceInfoCompat}
              to support {@link android.accessibilityservice.AccessibilityServiceInfo}.</li>

              <li>Added {@link android.support.v4.view.ViewGroupCompat}
              to support accessibility features in {@link android.view.ViewGroup}.
              </li>

              <li>Modified {@link android.support.v4.view.ViewCompat}
              to support accessibility features in {@link android.view.View}.</li>
            </ul>
          </li>

          <li>Changes to ViewPager:
            <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>
              <li>Bug fixes for user interface behavior.</li>
            </ul>
          </li>
        </ul>
      </dd>
    </dl>
  </div>
</div>

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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 4</a> <em>(October 2011)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
      <dt>Changes for v4 support library:</dt>
      <dd>
        <ul>
          <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>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>


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  <p><a href="#" onclick="return toggleContent(this)">
    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 3</a> <em>(July 2011)</em>
  </p>
  <div class="toggle-content-toggleme">
    <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/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 2</a> <em>(May 2011)</em>
  </p>
  <div class="toggle-content-toggleme">
    <dl>
    <dt>Changes for v4 library:</dt>
    <dd>
      <ul>
        <li>Support for fragment animations</li>
        <li>Fix {@link android.support.v4.app.Fragment#onActivityResult 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/styles/disclosure_down.png" class="toggle-content-img" alt=""
/>Android Support Library, revision 1</a> <em>(March 2011)</em>
  </p>
  <div class="toggle-content-toggleme">
      <p>Initial release with the v4 library.</p>
  </div>
</div>