docs: Notifications changes for L

<div id="qv">

<h2>In this document</h2>

<ol>

  <li><a href="#NotificationUI">Notification Display Elements</a>

    <ol>

      <li><a href="#NormalNotify">Normal view</a></li>

      <li><a href="#BigNotify">Big view</a></li>

    </ol>

  </li>

  <li><a href="#Design">Design Considerations</a></li>

  <li><a href="#CreateNotification">Creating a Notification</a>

    <ol>

      <li><a href="#Required">Required notification contents</a></li>

      <li><a href="#Actions">Notification actions</a></li>

      <li><a href="#Priority">Notification priority</a></li>

      <li><a href="#SimpleNotification">Creating a simple notification</a></li>

      <li><a href="#ApplyStyle">Applying a big view style to a notification</a></li>

      <li><a href="#ApplyStyle">Applying an expanded layout to a notification</a></li>

      <li><a href="#Compatibility">Handling compatibility</a></li>

    </ol>

  </li>

      <li><a href="#ActivityIndicator">Displaying a continuing activity indicator</a></li>

    </ol>

  </li>

  <li><a href="#metadata">Notification Metadata</a></li>

  <li><a href="#Heads-up">Heads-up Notifications</a></li>

  <li><a href="#lockscreenNotification">Lock Screen Notifications</a></li>

    <ol>

      <li><a href="#visibility">Setting Visibility</a></li>

      <li><a href="#controllingMedia">Controlling Media Playback on the Lock Screen</a></li>

    </ol>

  <li><a href="#CustomNotification">Custom Notification Layouts</a></li>

</ol>

</p>

<img

    id="figure1"

    src="{@docRoot}images/ui/notifications/iconic_notification.png"

    height="120" alt="" />

    src="{@docRoot}images/ui/notifications/notification_area.png"

    height="" alt="" />

<p class="img-caption">

    <strong>Figure 1.</strong> Notifications in the notification area.

</p>

<img id="figure2" src="{@docRoot}images/ui/notifications/normal_notification.png"

     height="293" alt="" />

<img id="figure2" src="{@docRoot}images/ui/notifications/notification_drawer.png"

     width="280px" alt="" />

<p class="img-caption">

    <strong>Figure 2.</strong> Notifications in the notification drawer.

</p>

<div class="note design">

    <p>

        <strong>Notification Design</strong>

    </p>

    <p>

        Notifications, as an important part of the Android UI, have their own design guidelines. To

        learn how to design notifications and their interactions, read the Android Design Guide

        <a href="{@docRoot}design/patterns/notifications.html">Notifications</a> topic.

    </p>

</div>

<p class="note">

    <strong>Note:</strong> Except where noted, this guide refers to the

<p class="note"><strong>Note:</strong> Except where noted, this guide refers to the

{@link android.support.v4.app.NotificationCompat.Builder NotificationCompat.Builder} class

in the version 4 <a href="{@docRoot}tools/support-library/index.html">Support Library</a>.

The class {@link android.app.Notification.Builder Notification.Builder} was added in Android

    3.0.

</p>

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<!-- ------------------------------------------------------------------------------------------ -->

<h2 id="NotificationUI">Notification Display Elements</h2>

<p>

    Notifications in the notification drawer can appear in one of two visual styles, depending on

    the version and the state of the drawer:

</p>

<dl>

    <dt>

        Normal view

    </dt>

    <dd>

        The standard view of the notifications in the notification drawer.

    </dd>

    <dt>

        Big view

    </dt>

    <dd>

        A large view that's visible when the notification is expanded. Big view is part of the

        expanded notification feature available as of Android 4.1.

    </dd>

</dl>

<p>

    These styles are described in the following sections.

</p>

<!-- ------------------------------------------------------------------------------------------ -->

<h3 id="NormalNotify">Normal view</h3>

<p>

    A notification in normal view appears in an area that's up to 64 dp tall. Even if you create a

    notification with a big view style, it will appear in normal view until it's expanded. This

    is an example of a normal view:

</p>

<img

    src="{@docRoot}images/ui/notifications/normal_notification_callouts.png"

    alt=""

    height="153"

    id="figure3" />

<p class="img-caption">

  <strong>Figure 3.</strong> Notification in normal view.

</p>

<p>

    The callouts in the illustration refer to the following:

</p>

<ol>

    <li>Content title</li>

    <li>Large icon</li>

    <li>Content text</li>

    <li>Content info</li>

    <li>Small icon</li>

    <li>

        Time that the notification was issued. You can set an explicit value with

        {@link android.support.v4.app.NotificationCompat.Builder#setWhen setWhen()}; if you don't

        it defaults to the time that the system received the notification.

    </li>

</ol>

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<h3 id="BigNotify">Big view</h3>

<p>

    A notification's big view appears only when the notification is expanded, which happens when the

    notification is at the top of the notification drawer, or when the user expands the

    notification with a gesture. Expanded notifications are available starting with Android 4.1.

</p>

<p>

    The following screenshot shows an inbox-style notification:

</p>

<img src="{@docRoot}images/ui/notifications/bigpicture_notification_callouts.png"

    alt=""

    height="240"

    id="figure4" />

<p class="img-caption">

  <strong>Figure 4.</strong> Big view notification.

</p>

<p>

    Notice that the big view shares most of its visual elements with the normal view. The

    only difference is callout number 7, the details area. Each big view style sets this area in

    a different way. The available styles are:

</p>

<dl>

    <dt>

        Big picture style

    </dt>

    <dd>

        The details area contains a bitmap up to 256 dp tall in its detail section.

    </dd>

    <dt>

        Big text style

    </dt>

    <dd>

        Displays a large text block in the details section.

    </dd>

    <dt>

        Inbox style

    </dt>

    <dd>

        Displays lines of text in the details section.

    </dd>

</dl>

<p>

    All of the big view styles also have the following content options that aren't

    available in normal view:

</p>

<dl>

    <dt>

        Big content title

    </dt>

    <dd>

        Allows you to override the normal view's content title with a title that appears only in

        the expanded view.

    </dd>

    <dt>

        Summary text

    </dt>

    <dd>

        Allows you to add a line of text below the details area.

    </dd>

</dl>

<p>

    Applying a big view style to a notification is described in the section

    <a href="#ApplyStyle">Applying a big view style to a notification</a>.

</p>

<!-- ------------------------------------------------------------------------------------------ -->

<!-- ------------------------------------------------------------------------------------------ -->

3.0 (API level 11).</p>

<h2 id="Design">Design Considerations</h2>

<p>Notifications, as an important part of the Android user interface, have their own design guidelines.

The material design changes introduced in Android 5.0 (API level 21) are of particular

importance, and you should review the <a href="{@docRoot}training/material/index.html">Material Design</a>

training for more information. To learn how to design notifications and their interactions, read the

<a href="{@docRoot}design/patterns/notifications.html">Notifications</a> design guide.</p>

<h2 id="CreateNotification">Creating a Notification</h2>

<p>

    You specify the UI information and actions for a notification in a

<p>You specify the UI information and actions for a notification in a

{@link android.support.v4.app.NotificationCompat.Builder NotificationCompat.Builder} object.

To create the notification itself, you call

    {@link android.support.v4.app.NotificationCompat.Builder#build

    NotificationCompat.Builder.build()}, which returns a {@link android.app.Notification} object

    containing your specifications.

    To issue the notification, you pass the {@link android.app.Notification} object to the system

    by calling {@link android.app.NotificationManager#notify NotificationManager.notify()}.

</p>

<!-- ------------------------------------------------------------------------------------------ -->

{@link android.support.v4.app.NotificationCompat.Builder#build NotificationCompat.Builder.build()},

which returns a {@link android.app.Notification} object containing your specifications. To issue the

notification, you pass the {@link android.app.Notification} object to the system by calling

{@link android.app.NotificationManager#notify NotificationManager.notify()}.</p>

<h3 id="Required">Required notification contents</h3>

<p>

    A {@link android.app.Notification} object <em>must</em> contain the following:

</p>

<p>

    Inside a {@link android.app.Notification}, the action itself is defined by a

    {@link android.app.PendingIntent} containing an {@link android.content.Intent} that starts

    {@link android.app.PendingIntent} containing an

    {@link android.content.Intent} that starts

    an {@link android.app.Activity} in your application. To associate the

    {@link android.app.PendingIntent} with a gesture, call the appropriate method of

    {@link android.support.v4.app.NotificationCompat.Builder}. For example, if you want to start

</pre>

<p>That's it. Your user has now been notified.</p>

<!-- ------------------------------------------------------------------------------------------ -->

<h3 id="ApplyStyle">Applying a big view style to a notification</h3>

<h3 id="ApplyStyle">Applying an expanded layout to a notification</h3>

<p>

    To have a notification appear in a big view when it's expanded, first create a

    To have a notification appear in an expanded view, first create a

    {@link android.support.v4.app.NotificationCompat.Builder} object with the normal view options

    you want. Next, call {@link android.support.v4.app.NotificationCompat.Builder#setStyle

    Builder.setStyle()} with a big view style object as its argument.

    Builder.setStyle()} with an expanded layout object as its argument.

</p>

<p>

    Remember that expanded notifications are not available on platforms prior to Android 4.1. To

</p>

<p>

    For example, the following code snippet demonstrates how to alter the notification created

    in the previous snippet to use the Inbox big view style:

    in the previous snippet to use the expanded layout:

</p>

<pre>

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)

NotificationCompat.InboxStyle inboxStyle =

        new NotificationCompat.InboxStyle();

String[] events = new String[6];

// Sets a title for the Inbox style big view

// Sets a title for the Inbox in expanded layout

inboxStyle.setBigContentTitle("Event tracker details:");

...

// Moves events into the big view

// Moves events into the expanded layout

for (int i=0; i < events.length; i++) {

    inboxStyle.addLine(events[i]);

}

// Moves the big view style object into the notification object.

// Moves the expanded layout object into the notification object.

mBuilder.setStyle(inBoxStyle);

...

// Issue the notification here.

</pre>

<h3 id="Compatibility">Handling compatibility</h3>

<p>

    Not all notification features are available for a particular version, even though

    the methods to set them are in the support library class

    <li>

        Ensure that all users can get to the functionality in the {@link android.app.Activity},

        by having it start when users click the notification. To do this,

        create a {@link android.app.PendingIntent} for the {@link android.app.Activity}. Call

        create a {@link android.app.PendingIntent}

        for the {@link android.app.Activity}. Call

        {@link android.support.v4.app.NotificationCompat.Builder#setContentIntent

        setContentIntent()} to add the {@link android.app.PendingIntent} to the notification.

    </li>

        that starts when users click the notification.

    </li>

</ol>

<!-- ------------------------------------------------------------------------------------------ -->

<!-- ------------------------------------------------------------------------------------------ -->

<h2 id="Managing">Managing Notifications</h2>

    <a href="{@docRoot}design/patterns/notifications.html">Notifications</a> Design guide.

</p>

<p class="note">

    <strong>Note:</strong> This Gmail feature requires the "inbox" big view style, which is

    <strong>Note:</strong> This Gmail feature requires the "inbox" expanded layout, which is

    part of the expanded notification feature available starting in Android 4.1.

</p>

<p>

<h3 id="Updating">Updating notifications</h3>

<p>

    To set up a notification so it can be updated, issue it with a notification ID by

    calling {@link android.app.NotificationManager#notify(int, Notification)

    NotificationManager.notify(ID, notification)}. To update this notification once you've issued

    calling {@link android.app.NotificationManager#notify(int, android.app.Notification) NotificationManager.notify()}.

    To update this notification once you've issued

    it, update or create a {@link android.support.v4.app.NotificationCompat.Builder} object,

    build a {@link android.app.Notification} object from it, and issue the

    {@link android.app.Notification} with the same ID you used previously. If

            mNotifyBuilder.build());

...

</pre>

<p>

    This produces a notification that looks like this:

</p>

<img

    id="figure5"

    src="{@docRoot}images/ui/notifications/updated_notification.png"

    alt=""

    height="118"/>

<p class="img-caption">

  <strong>Figure 5.</strong> Updated notification displayed in the notification drawer.

</p>

<!-- ------------------------------------------------------------------------------------------ -->

<h3 id="Removing">Removing notifications</h3>

<p>

// Starts the thread by calling the run() method in its Runnable

).start();

</pre>

<p>

    The resulting notifications are shown in figure 6. On the left side is a snapshot of the

    notification during the operation; on the right side is a snapshot of it after the operation

    has finished.

</p>

<img

    id="figure6"

    src="{@docRoot}images/ui/notifications/progress_bar_summary.png"

    height="84"

    alt="" />

<p class="img-caption">

<strong>Figure 6.</strong> The progress bar during and after the operation.</p>

<!-- ------------------------------------------------------------------------------------------ -->

<h3 id="ActivityIndicator">Displaying a continuing activity indicator</h3>

<p>

// Issues the notification

mNotifyManager.notify(0, mBuilder.build());

</pre>

<p>

    The resulting indicator is shown in figure 7:

<h2 id="metadata">Notification Metadata</h2>

<p>Notifications may be sorted according to metadata that you assign with the

following {@link android.support.v4.app.NotificationCompat.Builder} methods:</p>

<ul>

    <li>{@link android.support.v4.app.NotificationCompat.Builder#setCategory(java.lang.String) setCategory()}

    tells the system how to handle your app notifications when the device is in Priority mode

    (for example, if your notification represents an incoming call, instant message, or alarm).</li>

    <li>{@link android.support.v4.app.NotificationCompat.Builder#setPriority(int) setPriority()} causes

    notifications with the priority field set to {@code PRIORITY_MAX} or {@code PRIORITY_HIGH} to

    appear in a small floating window if the notification also has sound or vibration.</li>

    <li>{@link android.support.v4.app.NotificationCompat.Builder#addPerson(java.lang.String) addPerson()}

    allows you to add a list of people to a notification. Your app can use this to signal to the

    system that it should group together notifications from the specified people, or rank notifications

    from these people as being more important.</li>

</ul>

<div class="figure" style="width:230px">

  <img src="{@docRoot}images/ui/notifications/heads-up.png"

    alt="" width="" height="" id="figure3" />

  <p class="img-caption">

    <strong>Figure 3.</strong> Fullscreen activity showing a heads-up notification

  </p>

<img

    id="figure7"

    src="{@docRoot}images/ui/notifications/activity_indicator.png"

    height="99"

    alt="" />

<p class="img-caption"><strong>Figure 7.</strong> An ongoing activity indicator.</p>

</div>

<h2 id="Heads-up">Heads-up Notifications</h2>

<p>With Android 5.0 (API level 21), notifications can appear in a small floating window

(also called a <em>heads-up notification</em>) when the device is active

(that is, the device is unlocked and its screen is on). These notifications

appear similar to the compact form of your notification, except that the

heads-up notification also shows action buttons. Users can act on, or dismiss,

a heads-up notification without leaving the current app.</p>

<p>Examples of conditions that may trigger heads-up notifications include:</p>

<ul>

  <li>The user's activity is in fullscreen mode (the app uses

{@link android.app.Notification#fullScreenIntent}), or</li>

  <li>The notification has high priority and uses ringtones or

    vibrations</li>

</ul>

<h2 id="lockscreenNotification">Lock Screen Notifications</h2>

<p>With the release of Android 5.0 (API level 21), notifications may now appear on the lock

screen. Your app can use this functionality to provide media playback controls and other common

actions. Users can choose via Settings whether to display notifications on the lock screen, and

you can designate whether a notification from your app is visible on the lock screen.</p>

<h3 id="visibility">Setting Visibility</h3>

<p>Your app can control the level of detail visible in notifications displayed on a secure

lock screen. You call {@link android.support.v4.app.NotificationCompat.Builder#setVisibility(int) setVisibility()}

and specify one of the following values:</p>

<ul>

    <li>{@link android.support.v4.app.NotificationCompat#VISIBILITY_PUBLIC} shows the notification's

    full content.</li>

    <li>{@link android.support.v4.app.NotificationCompat#VISIBILITY_SECRET} doesn't show any part of

    this notification on the lock screen.</li>

    <li>{@link android.support.v4.app.NotificationCompat#VISIBILITY_PRIVATE} shows basic information,

    such as the notification's icon and the content title, but hides the notification's full content.</li>

</ul>

<p>When {@link android.support.v4.app.NotificationCompat#VISIBILITY_PRIVATE} is set, you can also

provide an alternate version of the notification content which hides certain details. For example,

an SMS app might display a notification that shows <em>You have 3 new text messages</em>, but hides the

message contents and senders. To provide this alternative notification, first create the replacement

notification using {@link android.support.v4.app.NotificationCompat.Builder}. When you create the

private notification object, attach the replacement notification to it through the

{@link android.support.v4.app.NotificationCompat.Builder#setPublicVersion(android.app.Notification) setPublicVersion()}

method.</p>

<h3 id="controllingMedia">Controlling Media Playback on the Lock Screen</h3>

<p>In Android 5.0 (API level 21) the lock screen no longer displays media controls

based on the {@link android.media.RemoteControlClient}, which is now deprecated. Instead, use the

{@link android.app.Notification.MediaStyle} template with the

{@link android.app.Notification.Builder#addAction(android.app.Notification.Action) addAction()}

method, which converts actions into clickable icons.</p>

<p class="note"><strong>Note:</strong> The template and the {@link android.app.Notification.Builder#addAction(android.app.Notification.Action) addAction()}

method are not included in the support library, so these features run in Android 5.0 and higher

only.</p>

<p>To display media playback controls on the lock screen in Android 5.0, set the visibility

to {@link android.support.v4.app.NotificationCompat#VISIBILITY_PUBLIC}, as described above. Then add

the actions and set the {@link android.app.Notification.MediaStyle} template, as described in the

following sample code:</p>

<pre>

Notification notification = new Notification.Builder(context)

    // Show controls on lock screen even when user hides sensitive content.

    .setVisibility(Notification.VISIBILITY_PUBLIC)

    .setSmallIcon(R.drawable.ic_stat_player)

    // Add media control buttons that invoke intents in your media service

    .addAction(R.drawable.ic_prev, "Previous", prevPendingIntent) // #0

    .addAction(R.drawable.ic_pause, "Pause", pausePendingIntent)  // #1

    .addAction(R.drawable.ic_next, "Next", nextPendingIntent)     // #2

    // Apply the media style template

    .setStyle(new Notification.MediaStyle()

    .setShowActionsInCompactView(1 /* #1: pause button */)

    .setMediaSession(mMediaSession.getSessionToken())

    .setContentTitle("Wonderful music")

    .setContentText("My Awesome Band")

    .setLargeIcon(albumArtBitmap)

    .build();

</pre>

<p class="note"><strong>Note:</strong> The deprecation of {@link android.media.RemoteControlClient}

has further implications for controlling media. See

<a href="{@docRoot}about/versions/android-5.0.html#MediaPlaybackControl">Media Playback Control</a>

for more information about the new APIs for managing the media session and controlling playback.</p>

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<!-- ------------------------------------------------------------------------------------------ -->

<h2 id="CustomNotification">Custom Notification Layouts</h2>