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<h1 itemprop="name" >Stacking Notifications</h1>
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<img src="/wear/images/11_bundles_B.png" height="200" width="169" style="float:right;margin:0 0 20px 40px" />
<img src="/wear/images/11_bundles_A.png" height="200" width="169" style="float:right;margin:0 0 20px 40px" />
<p>When your app creates more than one notification about the same type, you should traditionally
update the existing notification with a summary of all the notifications instead of creating multiple notifications. For instance, instead
of three notifications for each received email, you should create one with a summary such as "3 new
messages." To view the contents of each message, the user must then touch the notification to open
your app.</p>
<p>However, when a user is viewing your notifications on a wearable device, you can create
a stack that collects all the notifications for immediate access without creating multiple
cards in the card stream.</p>
<p>For details about designing notification stacks, see the
<a href="/wear/design/index.html#NotificationStacks">Design Principles of Android
Wear</a>.</p>
<h2 id="AddGroup">Add Each Notification to a Group</h2>
<p>To create a stack, call <a
href="/reference/android/preview/support/wearable/notifications/WearableNotifications.Builder.html#setGroup(java.lang.String, int)">
<code>setGroup()</code></a> for each notification you want in the stack, passing the same
group key. For example:</p>
<pre style="clear:right">
final static String GROUP_KEY_EMAILS = "group_key_emails";
NotificationCompat.Builder builder = new NotificationCompat.Builder(mContext)
.setContentTitle("New mail from " + sender)
.setContentText(subject)
.setSmallIcon(R.drawable.new_mail);
Notification notif = new WearableNotifications.Builder(builder)
.setGroup(GROUP_KEY_EMAILS)
.build();
</pre>
<p>By default, notifications appear in the order in which you added them, with the most recent
notification visible at the top. You can define a specific position in the group
by passing an order position as the second parameter for <a
href="/reference/android/preview/support/wearable/notifications/WearableNotifications.Builder.html#setGroup(java.lang.String, int)">
<code>setGroup()</code></a>.</p>
<h2 id="AddSummary">Add a Summary Notification</h2>
<p>It's important that you still provide a summary notification for handheld devices. So in
addition to adding each unique notification to the same stack group, also add the summary
notification but set its order position to be <a
href="/reference/android/preview/support/wearable/notifications/WearableNotifications.html#GROUP_ORDER_SUMMARY"><code>GROUP_ORDER_SUMMARY</code></a>.
The notification in this position does not appear in the stack on the wearable but
appears as the only notification on the handheld.</p>
<pre>
Notification summaryNotification = new WearableNotifications.Builder(builder)
.setGroup(GROUP_KEY_EMAILS, WearableNotifications.GROUP_ORDER_SUMMARY)
.build();
</pre>
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