docs/html/training/swipe/add-swipe-interface.jd


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page.title=Adding Swipe-to-Refresh To Your App
trainingnavtop=true
@jd:body


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

<!-- table of contents -->
<h2>This lesson teaches you to</h2>
<ol>
    <li><a href="#AddSwipeWidget">Add the SwipeRefreshLayout Widget</a>
    <li><a href="#AddRefreshAction">Add a Refresh Action to the Action Bar</a>
</ol>

<!-- other docs (NOT javadocs) -->
<h2>You should also read</h2>
<ul>
  <li>
    <a href=
    "{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a>
  </li>

  <li>
    <a href="{@docRoot}training/basics/actionbar/index.html">Adding the Action
    Bar</a>
  </li>
</ul>

<h2>Sample Apps</h2>

<ul>
    <li><a href="{@docRoot}samples/SwipeRefreshLayoutBasic/index.html">
            SwipeRefreshLayoutBasic</a></li>
    <li><a href="{@docRoot}samples/SwipeRefreshListFragment/index.html">
            SwipeRefreshListFragment</a></li>
</ul>

</div>
</div>


<p>
  The swipe-to-refresh user interface pattern is implemented entirely within
  the {@link android.support.v4.widget.SwipeRefreshLayout} widget, which
  detects the vertical swipe, displays a distinctive progress bar, and triggers
  callback methods in your app. You enable this behavior
  by adding the widget to your layout file as the parent of a {@link
  android.widget.ListView} or {@link android.widget.GridView}, and implementing
  the refresh behavior that gets invoked when the user swipes.
</p>

<p>
  This lesson shows you how to add the widget to an existing layout. It also
  shows you how to add a refresh action to the action bar overflow area, so
  that users who may be unable to use the swipe gesture can trigger a manual
  update with an external device.
</p>

<h2 id="AddSwipeWidget">Add the SwipeRefreshLayout Widget</h2>
<p>
  To add the swipe to refresh widget to an existing app, add {@link
  android.support.v4.widget.SwipeRefreshLayout} as the parent
  of a single {@link android.widget.ListView} or {@link
  android.widget.GridView}. Remember that {@link
  android.support.v4.widget.SwipeRefreshLayout} only supports a single {@link
  android.widget.ListView} or {@link android.widget.GridView} child.
</p>

<p>
  The following example demonstrates how to add the {@link
  android.support.v4.widget.SwipeRefreshLayout} widget to an existing layout
  file containing a {@link android.widget.ListView}:
</p>

<pre>&lt;android.support.v4.widget.SwipeRefreshLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="&#64;+id/swiperefresh"
    android:layout_width="match_parent"
    android:layout_height="match_parent"&gt;

    &lt;ListView
        android:id="&#64;android:id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" /&gt;

&lt;/android.support.v4.widget.SwipeRefreshLayout&gt;</pre>

<p>
  You can also use the {@link android.support.v4.widget.SwipeRefreshLayout}
  widget with a {@link android.support.v4.app.ListFragment}. If the layout
  contains a {@link android.widget.ListView} with the ID
  <code>"@android:id/list"</code>, the swipe-to-refresh functionality is
  automatically supported. However, explicitly declaring the {@link
  android.widget.ListView} in this way supersedes the default {@link
  android.support.v4.app.ListFragment} view structure. If you want to use the
  default view structure, you will have to override parts of the {@link
  android.support.v4.widget.SwipeRefreshLayout} and {@link
  android.support.v4.app.ListFragment} behavior. For an example of how to do
  this, see the <a href=
  "{@docRoot}samples/SwipeRefreshListFragment/index.html">SwipeRefreshListFragment</a>
  sample app.
</p>

<h2 id="AddRefreshAction">Add a Refresh Action to the Action Bar</h2>

<p>
  You should add a refresh action to your app's action bar to ensure that
  users who may not be able to perform a swipe gesture can still trigger a
  manual update. For example, users with accessibility issues can trigger
  action bar actions using external devices, such as keyboards and D-pads.
</p>

<p>
  You should add the refresh action as a menu item,
  rather than as a button, by setting the attribute
  <code>android:showAsAction=never</code>. If you display the action as a
  button, users may assume that the refresh button action is different from the
  swipe-to-refresh action. By making the refresh action less conspicuous in the
  action bar, you can encourage users to perform manual updates with the swipe
  gesture while still maintaining the accessible option in a place where D-pad
  users would look for it.
</p>

<p>
  The following code demonstrates how to add the swipe-to-refresh action to the
  overflow area:
</p>

<pre>&lt;menu xmlns:android="http://schemas.android.com/apk/res/android" &gt;
    &lt;item
        android:id="&#64;+id/menu_refresh"
        android:showAsAction="never"
        android:title="&#64;string/menu_refresh"/&gt;
&lt;/menu&gt;</pre>