android_frameworks_base/docs/html/training/wearables/ui/exit.jd

page.title=Exiting Full-Screen Activities

@jd:body

<div id="tb-wrapper">
<div id="tb">
<h2>This lesson teaches you to</h2>
<ol>
  <li><a href="#disable-swipe">Disable the Swipe-To-Dismiss Gesture</a></li>
  <li><a href="#long-press">Implement the Long Press to Dismiss Pattern</a></li>
</ol>
<h2>You should also read</h2>
<ul>
  <li><a href="{@docRoot}design/wear/index.html">Android Wear Design Principles</a></li>
</ul>
</div>
</div>


<p>By default, users exit Android Wear activities by swiping from left to right. If the app
contains horizontally scrollable content, users first have to navigate to the edge of the
content and then swipe again from left to right to exit the app.</p>

<p>For more immersive experiences, like an app that can scroll a map in any direction, you can
disable the swipe to exit gesture in your app. However, if you disable it, you must implement
the long-press-to-dismiss UI pattern to let users exit your app using the
<a href="{@docRoot}reference/android/support/wearable/view/DismissOverlayView.html"><code>DismissOverlayView</code></a>
class from the Wearable UI Library. You must also inform your users the first time they run your app
that they can exit using a long press.</p>

<p>For design guidelines about exiting Android Wear activities, see
<a href="{@docRoot}design/wear/structure.html#Custom">Breaking out of the card</a>.</p>


<h2 id="disable-swipe">Disable the Swipe-To-Dismiss Gesture</h2>

<p>If the user interaction model of your app interferes with the swipe-to-dismiss gesture,
you can disable it for your app. To disable the swipe-to-dismiss gesture in your app, extend
the default theme and set the <code>android:windowSwipeToDismiss</code> attribute to
<code>false</code>:</p>

<pre>
&lt;style name="AppTheme" parent="Theme.DeviceDefault">
    &lt;item name="android:windowSwipeToDismiss">false&lt;/item>
&lt;/style>
</pre>

<p>If you disable this gesture, you must implement the long-press-to-dismiss UI pattern to let users
exit your app, as described in the next section.</p>


<h2 id="long-press">Implement the Long Press to Dismiss Pattern</h2>

<p>To use the
<a href="{@docRoot}reference/android/support/wearable/view/DismissOverlayView.html"><code>DismissOverlayView</code></a>
class in your activity, add this element to your layout definition such that it covers the whole
screen and is placed above all other views.</p>

<p>The following example shows how to add the
<a href="{@docRoot}reference/android/support/wearable/view/DismissOverlayView.html"><code>&lt;DismissOverlayView&gt;</code></a>
element:</p>

<pre>
&lt;FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="match_parent"
    android:layout_width="match_parent">

    &lt;!-- other views go here -->

    &lt;android.support.wearable.view.DismissOverlayView
        android:id="@+id/dismiss_overlay"
        android:layout_height="match_parent"
        android:layout_width="match_parent"/>
&lt;FrameLayout>
</pre>

<p>In your activity, obtain the
<a href="{@docRoot}reference/android/support/wearable/view/DismissOverlayView.html"><code>&lt;DismissOverlayView&gt;</code></a>
element and set some introductory text. This text is shown to users the first time they run your app
to inform them that they can exit the app using a long press gesture. Then use a
<a href="{@docRoot}reference/android/view/GestureDetector.html"><code>GestureDetector</code></a>
to detect a long press:</p>

<pre>
public class WearActivity extends Activity {

    private DismissOverlayView mDismissOverlay;
    private GestureDetector mDetector;

    public void onCreate(Bundle savedState) {
        super.onCreate(savedState);
        setContentView(R.layout.wear_activity);

        // Obtain the DismissOverlayView element
        mDismissOverlay = (DismissOverlayView) findViewById(R.id.dismiss_overlay);
        mDismissOverlay.setIntroText(R.string.long_press_intro);
        mDismissOverlay.showIntroIfNecessary();

        // Configure a gesture detector
        mDetector = new GestureDetector(this, new SimpleOnGestureListener() {
            public void onLongPress(MotionEvent ev) {
                mDismissOverlay.show();
            }
        });
    }

    // Capture long presses
    &#64;Override
    public boolean onTouchEvent(MotionEvent ev) {
        return mDetector.onTouchEvent(ev) || super.onTouchEvent(ev);
    }
}
</pre>

<p>When the system detects a long press gesture, the
<a href="{@docRoot}reference/android/support/wearable/view/DismissOverlayView.html"><code>&lt;DismissOverlayView&gt;</code></a>
element shows an <strong>Exit</strong> button, which terminates your activity if the user presses
it.</p>