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author | Joe Malin <jmalin@google.com> | 2012-10-11 17:42:46 -0700 |
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committer | Android Git Automerger <android-git-automerger@android.com> | 2012-10-11 17:42:46 -0700 |
commit | 87afd6eb4b7e08da0c10bece82ed594c5babc404 (patch) | |
tree | 5437f140da1135068b9485ad96a56460191027c0 | |
parent | f881448913ec48cd36ab017c25581cc5f92ba10a (diff) | |
parent | 54a1e4d4c4216af987c7b769723cd2e59ca2c233 (diff) | |
download | frameworks_base-87afd6eb4b7e08da0c10bece82ed594c5babc404.zip frameworks_base-87afd6eb4b7e08da0c10bece82ed594c5babc404.tar.gz frameworks_base-87afd6eb4b7e08da0c10bece82ed594c5babc404.tar.bz2 |
am 54a1e4d4: am 5832d1ce: am 01154bda: DOC CHANGE: Notifications Guide
* commit '54a1e4d4c4216af987c7b769723cd2e59ca2c233':
DOC CHANGE: Notifications Guide
18 files changed, 861 insertions, 605 deletions
diff --git a/docs/html/guide/topics/ui/notifiers/notifications.jd b/docs/html/guide/topics/ui/notifiers/notifications.jd index 273b5f7..fbff532 100644 --- a/docs/html/guide/topics/ui/notifiers/notifications.jd +++ b/docs/html/guide/topics/ui/notifiers/notifications.jd @@ -1,646 +1,902 @@ -page.title=Status Notifications -parent.title=Notifications -parent.link=index.html +page.title=Notifications @jd:body <div id="qv-wrapper"> - <div id="qv"> - <h2>Quickview</h2> - <ul> - <li>A status notification allows your application to notify the user of an event -without interupting their current activity</li> - <li>You can attach an intent to your notification that the system will initiate when the -user clicks it</li> - </ul> - - <h2>In this document</h2> +<div id="qv"> +<h2>In this document</h2> <ol> - <li><a href="#Basics">The Basics</a></li> - <li><a href="#HandlingNotifications">Responding to Notifications</a></li> - <li><a href="#ManageYourNotifications">Managing your Notifications</a></li> - <li><a href="#CreateANotification">Creating a Notification</a> - <ol> - <li><a href="#Updating">Updating the notification</a></li> - <li><a href="#Sound">Adding a sound</a></li> - <li><a href="#Vibration">Adding vibration</a></li> - <li><a href="#Lights">Adding flashing lights</a></li> - <li><a href="#More">More features</a></li> - </ol> - </li> - <li><a href="#CustomExpandedView">Creating a Custom Notification Layout</a></li> + <li> + <a href="#NotificationUI">Notification Display Elements</a> + </li> + <li> + <a href="#CreateNotification">Creating a Notification</a> + </li> + <li> + <a href="#Managing">Managing Notifications</a> + </li> + <li> + <a href="#NotificationResponse">Preserving Navigation when Starting an Activity</a> + </li> + <li> + <a href="#Progress">Displaying Progress in a Notification</a> + </li> + <li> + <a href="#CustomNotification">Custom Notification Layouts</a> + </li> </ol> <h2>Key classes</h2> <ol> - <li>{@link android.app.Notification}</li> - <li>{@link android.app.NotificationManager}</li> + <li>{@link android.app.NotificationManager}</li> + <li>{@link android.support.v4.app.NotificationCompat}</li> </ol> - - <h2>See also</h2> + <h2>Videos</h2> <ol> - <li><a href="{@docRoot}design/patterns/notifications.html">Android -Design: Notifications</a></li> + <li> + <a href="http://www.youtube.com/watch?v=Yc8YrVc47TI&feature=player_detailpage#t=1672s"> + Notifications in 4.1</a> + </li> </ol> - </div> +<h2>See also</h2> +<ol> + <li> + <a href="{@docRoot}design/patterns/notifications.html">Android Design: Notifications</a> + </li> +</ol> </div> - -<p>A status notification adds an icon to the system's status bar -(with an optional ticker-text message) and a notification message in the notifications window. -When the user selects the notification, Android fires an -{@link android.content.Intent} that is defined by the {@link android.app.Notification} (usually to -launch an {@link android.app.Activity}). -You can also configure the notification to alert the user with a sound, a vibration, and flashing -lights on the device.</p> - -<p>A status notification should be used for any case in -which a background service needs to alert the user about an event that requires a response. A -background service -<strong>should never</strong> launch an activity on its own in order to receive user interaction. -The service should instead create a status notification that will launch the activity -when selected by the user.</p> - -<p>Figure 1 shows the status bar with a notification icon on the left side.</p> -<img src="{@docRoot}images/status_bar.png" alt="" /> -<p class="img-caption"><strong>Figure 1.</strong> Status bar with a notification.</p> - -<p>Figure 2 shows the notification's message in the notifications window.</p> - -<img src="{@docRoot}images/notifications_window.png" alt="" /> -<p class="img-caption"><strong>Figure 2.</strong> The notifications window.</p> - - +</div> +<p> + A notification is a message you can display to the user outside of your application's + normal UI. When you tell the system to issue a notification, it first appears as an icon in the + <strong>notification area</strong>. To see the details of the notification, the user opens the + <strong>notification drawer</strong>. Both the notification area and the notification drawer + are system-controlled areas that the user can view at any time. +</p> +<img + id="figure1" + src="{@docRoot}images/ui/notifications/iconic_notification.png" + height="32" + 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="240" 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>For design guidelines, read Android Design's <a -href="{@docRoot}design/patterns/notifications.html">Notifications</a> guide.</p> + <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> - - - -<h2 id="Basics">The Basics</h2> - -<p>An {@link android.app.Activity} or {@link android.app.Service} can initiate a status -notification. Because an activity can perform actions only while it is -running in the foreground and its window has focus, you will usually create status notifications -from a -service. This way, the notification can be created from the background, -while the user is using another application or -while the device is asleep. To create a notification, you must use two -classes: {@link android.app.Notification} and {@link android.app.NotificationManager}.</p> - -<p>Use an instance of the {@link android.app.Notification} class to define the properties of your -status notification, such as the status icon, the notification message, and extra settings -such as a sound to play. The {@link android.app.NotificationManager} is an Android system service -that executes and manages all status notifications. You do not instantiate the -{@link android.app.NotificationManager} directly. In order -to give it your {@link android.app.Notification}, you must retrieve a reference to the -{@link android.app.NotificationManager} with -{@link android.app.Activity#getSystemService(String) getSystemService()} and -then, when you want to notify the user, pass it your {@link android.app.Notification} with -{@link android.app.NotificationManager#notify(int,Notification) notify()}. </p> - -<p>To create a status notification:</p> -<ol> - <li>Get a reference to the {@link android.app.NotificationManager}: -<pre> -String ns = Context.NOTIFICATION_SERVICE; -NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns); -</pre> - </li> - <!-- use Notification.Builder in 3.0 --> - <li>Instantiate the {@link android.app.Notification}: -<pre> -int icon = R.drawable.notification_icon; -CharSequence tickerText = "Hello"; -long when = System.currentTimeMillis(); - -Notification notification = new Notification(icon, tickerText, when); -</pre> - </li> - <li>Define the notification's message and {@link android.app.PendingIntent}: -<pre> -Context context = getApplicationContext(); -CharSequence contentTitle = "My notification"; -CharSequence contentText = "Hello World!"; -Intent notificationIntent = new Intent(this, MyClass.class); -PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0); - -notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent); -</pre> - </li> - <li>Pass the {@link android.app.Notification} to the {@link android.app.NotificationManager}: -<pre> -private static final int HELLO_ID = 1; - -mNotificationManager.notify(HELLO_ID, notification); -</pre> - <p>That's it. Your user has now been notified.</p> - </li> -</ol> - - -<h2 id="HandlingNotifications">Responding to Notifications</h2> - -<p>A central part of the user's experience with a notification revolves around -how it interacts with the application's UI flow. You must implement -this correctly to provide a consistent user experience within your app.</p> - -<p>Two typical examples of notifications are provided by Calendar, which can send out -notifications of upcoming events, and Email, which can send out notifications -when new messages arrive. These represent the two recommended patterns for handling -notifications: either launching into an activity that is separate from the -main application, or launching an entirely new instance of the application -showing the appropriate point for the notification.</p> - -<p>The following scenario shows how the activity stack should work -in these two typical notification flows, first handling a Calendar notification: +<p class="note"> + <strong>Note:</strong> This guide refers to the + {@link android.support.v4.app.NotificationCompat.Builder NotificationCompat.Builder} class + in the version 4 <a href="{@docRoot}tools/extras/support-library.html">Support Library</a>. + The class {@link android.app.Notification.Builder Notification.Builder} was added in API + level 11. +</p> +<!-- ------------------------------------------------------------------------------------------ --> +<!-- ------------------------------------------------------------------------------------------ --> +<h2 id="NotificationUI">Notification Display Elements</h2> +<p> + Notifications in the notification drawer appear in two main visual styles, normal view and + big view. +</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="204" + 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>User is creating a new event in Calendar. They realize they - need to copy part of an email message into this event. - </li> - <li> - The user chooses Home > Email. - </li> - <li> - While in Email, they receive a notification from Calendar for an upcoming - meeting. - </li> - <li> - So they choose that notification, which takes them to a - dedicated Calendar activity that displays brief details of the - upcoming meeting. - </li> - <li> - The user has seen enough to know they have a meeting coming up, - so they press the <em>Back</em> button. They are now returned to Email, which - is where they were when they took the notification. - </li> -</ol> - -<p>Handling an Email notification:</p> - <ol> - <li> - The user is currently in Email composing a message, and needs to - check a date in their calendar. - </li> - <li> - The user chooses Home > Calendar. - </li> - <li> - While in Calendar, they receive a notification from Email about a new - message. - </li> - <li> - They select the notification, which brings them to Email with the message - details displayed. This has replaced what they were previously doing - (writing an e-mail), but that message is still saved in their drafts. - </li> - <li> - The user presses <em>Back</em> once to go to the message list (the typical flow in the - Email app), and press <em>Back</em> again to return to Calendar as they left it. - </li> + <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> - -<p>In an Email style of notification, the UI launched by the notification -shows the main application in a state representing that notification. -For example, when the Email application comes to the foreground from its -notification, it displays either the conversion list or a specific -conversation depending on whether there are multiple or only one new -email. To achieve this, we want to completely replace whatever current -state the application is in with a new activity stack representing the -new notification state.</p> - -<p>The following code illustrates how to show this kind of notification. Of -most interest is the <code>makeMessageIntentStack()</code> method, which constructs -an array of intents representing the app's new activity stack for this state. -(If you are using fragments, you may need to initialize your fragment and -app state so that pressing <em>Back</em> will switch the UI back to its parent state.) -The core of this is the {@link android.content.Intent#makeRestartActivityTask -Intent.makeRestartActivityTask()} method, which constructs the root activity -of the stack with the appropriate flags, such as -{@link android.content.Intent#FLAG_ACTIVITY_CLEAR_TASK Intent.FLAG_ACTIVITY_CLEAR_TASK}.</p> - -{@sample development/samples/ApiDemos/src/com/example/android/apis/app/IncomingMessage.java - app_notification} - -<p>In a Calendar style of notification, the UI launched by the notification -is a dedicated activity that is not part of the normal application flow. -For example, when the user receives a Calendar notification, choosing that -notification starts a special activity that displays a list -of upcoming calendar events — this view is available only -from the notification, not through the Calendar's normal user -interface.</p> - -<p>The code for posting this type of notification is very straight-forward; it -is like the above, but the {@link android.app.PendingIntent} is for just a single -activity, our dedicated notification activity.</p> - -{@sample development/samples/ApiDemos/src/com/example/android/apis/app/IncomingMessage.java - interstitial_notification} - -<p>This is not enough, however. Normally Android considers all activities within -an application to be part of that application's UI flow, so simply launching the -activity like this can cause it to be mixed with your normal application back stack -in undesired ways. To make it behave correctly, in the manifest declaration -for the activity the attributes -<code>android:launchMode="singleTask"</code>, -<code>android:taskAffinity=""</code> and -<code>android:excludeFromRecents="true"</code> -must be set. The full activity declaration for this sample is:</p> - -{@sample development/samples/ApiDemos/AndroidManifest.xml interstitial_affinity} - -<p>You must be careful when launching other activities from this initial activity, -because this is not a top-level part of the application, does not appear in -recents, and needs to be relaunched at any point from the notification with new data -to show. This best approach is to make sure any activity launched from it is -launched in its own task. When doing this care must be taken to make sure this -new task interacts well with the current state of your exiting application's -task. This is essentially -the same as switching to the main application as described for the Email style -notification shown before. Given the <code>makeMessageIntentStack()</code> -method previously shown, handling a click then would look something like this:</p> - -{@sample development/samples/ApiDemos/src/com/example/android/apis/app/IncomingMessageInterstitial.java - app_launch} - -<h2 id="ManageYourNotifications">Managing your Notifications</h2> - -<p>The {@link android.app.NotificationManager} is a system service that manages all -notifications. You must retrieve a reference to it with the -{@link android.app.Activity#getSystemService(String) getSystemService()} method. -For example:</p> -<pre> -String ns = Context.NOTIFICATION_SERVICE; -NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns); -</pre> - -<p>When you want to deliver your status notification, pass the {@link android.app.Notification} -to the {@link android.app.NotificationManager} with {@link -android.app.NotificationManager#notify(int,Notification)}. -The first parameter is the unique ID for the notification and the second is the {@link -android.app.Notification} object. -The ID uniquely identifies the notification from within your -application. The ID is necessary if you need to update the notification or (if -your application manages different kinds of notifications) select the appropriate action -when the user returns to your application via the intent defined in the notification.</p> - -<p>To clear the status notification when the user selects it from the notifications -window, add the "FLAG_AUTO_CANCEL" flag to your {@link android.app.Notification}. You can -also clear it manually with {@link android.app.NotificationManager#cancel(int)}, passing it the -notification ID, or clear all your notifications with {@link -android.app.NotificationManager#cancelAll()}.</p> - - -<h2 id="CreateANotification">Creating a Notification</h2> - -<p>A {@link android.app.Notification} object defines the details of the notification -message that is displayed in the status bar and notifications window, and any other -alert settings, such as sounds and blinking lights.</p> - -<p>A status notification <em>requires</em> all of the following:</p> -<ul> - <li>An icon for the status bar</li> - <li>A title and message, unless you define a - <a href="#CustomExpandedView">custom notification layout</a></li> - <li>A {@link android.app.PendingIntent}, to be fired when the notification is selected</li> -</ul> -<p>Optional settings for the status notification include:</p> +<!-- ------------------------------------------------------------------------------------------ --> +<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. +</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> +<!-- ------------------------------------------------------------------------------------------ --> +<!-- ------------------------------------------------------------------------------------------ --> +<h2 id="CreateNotification">Creating a Notification</h2> +<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> +<!-- ------------------------------------------------------------------------------------------ --> +<h3 id="Required">Required notification contents</h3> +<p> + A {@link android.app.Notification} object <em>must</em> contain the following: +</p> <ul> - <li>A ticker-text message for the status bar</li> - <li>An alert sound</li> - <li>A vibrate setting</li> - <li>A flashing LED setting</li> + <li> + A small icon, set by + {@link android.support.v4.app.NotificationCompat.Builder#setSmallIcon setSmallIcon()} + </li> + <li> + A title, set by + {@link android.support.v4.app.NotificationCompat.Builder#setContentTitle setContentTitle()} + </li> + <li> + Detail text, set by + {@link android.support.v4.app.NotificationCompat.Builder#setContentText setContentText()} + </li> </ul> - -<p>The starter-kit for a new notification includes the -{@link android.app.Notification#Notification(int,CharSequence,long)} constructor and the -{@link android.app.Notification#setLatestEventInfo(Context,CharSequence,CharSequence,PendingIntent)} -method. These define all the required settings for a notification. -The following snippet demonstrates a basic notification setup:</p> -<pre> -int icon = R.drawable.notification_icon; // icon from resources -CharSequence tickerText = "Hello"; // ticker-text -long when = System.currentTimeMillis(); // notification time -Context context = getApplicationContext(); // application Context -CharSequence contentTitle = "My notification"; // message title -CharSequence contentText = "Hello World!"; // message text - -Intent notificationIntent = new Intent(this, MyClass.class); -PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0); - -// the next two lines initialize the Notification, using the configurations above -Notification notification = new Notification(icon, tickerText, when); -notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent); -</pre> - - -<h3 id="Updating">Updating the notification</h3> - -<p>You can update the information in your status notification as events -continue to occur in your application. For example, when a new SMS text message arrives -before previous messages have been read, the Messaging application updates the existing -notification to display the total number of new messages received. -This practice of updating an existing notification is much better than adding new -notifications, because it avoids clutter in the notifications window.</p> - -<p>Because each notification is uniquely identified -by the {@link android.app.NotificationManager} with an integer ID, you can revise the notification -by calling {@link -android.app.Notification#setLatestEventInfo(Context,CharSequence,CharSequence,PendingIntent) -setLatestEventInfo()} with new values, change some field values of the notification, and then call -{@link android.app.NotificationManager#notify(int,Notification) notify()} again.</p> - -<p>You can revise each property with the object member fields -(except for the {@link android.content.Context} and the notification title and text). You -should always revise the text message when you update the notification by calling -{@link android.app.Notification#setLatestEventInfo(Context,CharSequence,CharSequence,PendingIntent) -setLatestEventInfo()} with new values for <var>contentTitle</var> and <var>contentText</var>. -Then call {@link android.app.NotificationManager#notify(int,Notification) notify()} to update the -notification. (Of course, if you've created a <a href="#CustomExpandedView">custom notification -layout</a>, then updating these title and text values has no effect.)</p> - - -<h3 id="Sound">Adding a sound</h3> - -<p>You can alert the user with the default notification sound -(which is defined by the user) or with a sound specified by your application.</p> - -<p>To use the user's default sound, add "DEFAULT_SOUND" to the <var>defaults</var> field:</p> -<pre> -notification.defaults |= Notification.DEFAULT_SOUND; -</pre> - -<p>To use a different sound with your notifications, pass a Uri reference to the -<var>sound</var> field. -The following example uses a known audio file saved to the device SD card:</p> -<pre> -notification.sound = Uri.parse("file:///sdcard/notification/ringer.mp3"); -</pre> - -<p>In the next example, the audio file is chosen from the internal -{@link android.provider.MediaStore.Audio.Media MediaStore}'s {@link android.content.ContentProvider}:</p> +<h3 id="Optional">Optional notification contents and settings</h3> +<p> + All other notification settings and contents are optional. To learn more about them, + see the reference documentation for {@link android.support.v4.app.NotificationCompat.Builder}. +</p> +<!-- ------------------------------------------------------------------------------------------ --> +<h3 id="Actions">Notification actions</h3> +<p> + Although they're optional, you should add at least one action to your notification. + An action allows users to go directly from the notification to an + {@link android.app.Activity} in your application, where they can look at one or more events + or do further work. +</p> +<p> + A notification can provide multiple actions. You should always define the action that's + triggered when the user touches the notification; usually this action opens an + {@link android.app.Activity} in your application. You can also add buttons to the notification + that perform additional actions such as snoozing an alarm or responding immediately to a text + message. +</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 + 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 + {@link android.app.Activity} when the user touches the notification text in + the notification drawer, you add the {@link android.app.PendingIntent} by calling + {@link android.support.v4.app.NotificationCompat.Builder#setContentIntent setContentIntent()}. +</p> +<p> + Starting an {@link android.app.Activity} when the user touches the notification is the most + common action scenario. You can also start an {@link android.app.Activity} when the user + dismisses an {@link android.app.Activity}, and you can start an {@link android.app.Activity} + from an action button. To learn more, read the reference guide for + {@link android.support.v4.app.NotificationCompat.Builder}. +</p> +<!-- ------------------------------------------------------------------------------------------ --> +<h3 id="SimpleNotification">Creating a simple notification</h3> +<p> + The following snippet illustrates a simple notification that specifies an activity to open when + the user touches the notification. Notice that the code creates a + {@link android.support.v4.app.TaskStackBuilder} object and uses it to create the + {@link android.app.PendingIntent} for the action. This pattern is explained in more detail + in the section <a href="#NotificationResponse"> + Preserving Navigation when Starting an Activity</a>: +</p> <pre> -notification.sound = Uri.withAppendedPath(Audio.Media.INTERNAL_CONTENT_URI, "6"); +NotificationCompat.Builder mBuilder = + new NotificationCompat.Builder(this) + .setSmallIcon(R.drawable.notification_icon) + .setContentTitle("My notification") + .setContentText("Hello World!"); +// Creates an explicit intent for an Activity in your app +Intent resultIntent = new Intent(this, ResultActivity.class); + +// The stack builder object will contain an artificial back stack for the +// started Activity. +// This ensures that navigating backward from the Activity leads out of +// your application to the Home screen. +TaskStackBuilder stackBuilder = TaskStackBuilder.create(this); +// Adds the back stack for the Intent (but not the Intent itself) +stackBuilder.addParentStack(ResultActivity.class); +// Adds the Intent that starts the Activity to the top of the stack +stackBuilder.addNextIntent(resultIntent); +PendingIntent resultPendingIntent = + stackBuilder.getPendingIntent( + 0, + PendingIntent.FLAG_UPDATE_CURRENT + ); +mBuilder.setContentIntent(resultPendingIntent); +NotificationManager mNotificationManager = + (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); +// mId allows you to update the notification later on. +mNotificationManager.notify(mId, mBuilder.build()); </pre> - -<p>In this case, the exact ID of the media file ("6") is known and appended to the content -{@link android.net.Uri}. If you don't know the exact ID, you must query all the -media available in the {@link android.provider.MediaStore} with a {@link -android.content.ContentResolver}. -See the <a href="{@docRoot}guide/topics/providers/content-providers.html">Content Providers</a> -documentation for more information on using a ContentResolver.</p> - -<p>If you want the sound to continuously repeat until the user responds to the notification -or the notification is cancelled, add {@link android.app.Notification#FLAG_INSISTENT} to the -<var>flags</var> field.</p> - -<p class="note"><strong>Note:</strong> If the <var>defaults</var> field includes -{@link android.app.Notification#DEFAULT_SOUND}, then the default sound overrides any sound defined -by the <var>sound</var> field.</p> - - -<h3 id="Vibration">Adding vibration</h3> - -<p>You can alert the user with the the default -vibration pattern or with a vibration pattern defined by your application.</p> - -<p>To use the default pattern, add {@link android.app.Notification#DEFAULT_VIBRATE} to the -<var>defaults</var> field:</p> +<p>That's it. Your user has now been notified.</p> +<!-- ------------------------------------------------------------------------------------------ --> +<h3 id="ApplyStyle">Applying a big view style to a notification</h3> +<p> + To have a notification appear in a big view when it's expanded, 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. +</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: +</p> <pre> -notification.defaults |= Notification.DEFAULT_VIBRATE; +NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this) + .setSmallIcon(R.drawable.notification_icon) + .setContentTitle("Event tracker") + .setContentText("Events received") +NotificationCompat.InboxStyle inboxStyle = + new NotificationCompat.InboxStyle(); +String[] events = new String[6]; +// Sets a title for the Inbox style big view +inboxStyle.SetBigContentTitle("Event tracker details:"); +... +// Moves events into the big view +for (int i=0; i < events.length; i++) { + + inboxStyle.addLine(events[i]); +} +// Moves the big view style object into the notification object. +mBuilder.setStyle(inBoxStyle); +... +// Issue the notification here. </pre> - -<p>To define your own vibration pattern, pass an array of <em>long</em> values to the -<var>vibrate</var> field:</p> +<!-- ------------------------------------------------------------------------------------------ --> +<!-- ------------------------------------------------------------------------------------------ --> +<h2 id="Managing">Managing Notifications</h2> +<p> + When you need to issue a notification multiple times for the same type of event, you + should avoid making a completely new notification. Instead, you should consider updating a + previous notification, either by changing some of its values or by adding to it, or both. +</p> +<p> + For example, Gmail notifies the user that new emails have arrived by increasing its count of + unread messages and by adding a summary of each email to the notification. This is called + "stacking" the notification; it's described in more detail in the + <a href="{@docRoot}design/patterns/notifications.html">Notifications</a> Design guide. +</p> +<p> + The following section describes how to update notifications and also how to remove them. +</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 + 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 + the previous notification is still visible, the system updates it from the contents of + the {@link android.app.Notification} object. If the previous notification has been dismissed, a + new notification is created instead. +</p> +<p> + The following snippet demonstrates a notification that is updated to reflect the + number of events that have occurred. It stacks the notification, showing a summary: +</p> <pre> -long[] vibrate = {0,100,200,300}; -notification.vibrate = vibrate; +mNotificationManager = + (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); +// Sets an ID for the notification, so it can be updated +int notifyID = 1; +mNotifyBuilder = new NotificationCompat.Builder(this) + .setContentTitle("New Message") + .setContentText("You've received new messages.") + .setSmallIcon(R.drawable.ic_notify_status) +numMessages = 0; +// Start of a loop that processes data and then notifies the user +... + mNotifyBuilder.setContentText(currentText) + .setNumber(++numMessages); + // Because the ID remains unchanged, the existing notification is + // updated. + mNotificationManager.notify( + notifyID, + mNotifyBuilder.build()); +... </pre> - -<p>The long array defines the alternating pattern for the length of vibration off and on -(in milliseconds). The first value is how long to wait (off) before beginning, the second -value is the length of the first vibration, the third is the next length off, and so on. -The pattern can be as long as you like, but it can't be set to repeat. +<p> + This produces a notification that looks like this: </p> - -<p class="note"><strong>Note:</strong> If the <var>defaults</var> field includes -{@link android.app.Notification#DEFAULT_VIBRATE}, then the default vibration overrides any vibration -defined by the -<var>vibrate</var> field.</p> - - -<h3 id="Lights">Adding flashing lights</h3> - -<p>To alert the user by flashing LED lights, you can implement the default -light pattern (if available), or define your own color and pattern for the lights.</p> - -<p>To use the default light setting, add {@link android.app.Notification#DEFAULT_LIGHTS} to the -<var>defaults</var> field:</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> + Notifications remain visible until one of the following happens: +</p> +<ul> + <li> + The user dismisses the notification either individually or by using "Clear All" (if + the notification can be cleared). + </li> + <li> + The user touches the notification, and you called + {@link android.support.v4.app.NotificationCompat.Builder#setAutoCancel setAutoCancel()} when + you created the notification. + </li> + <li> + You call {@link android.app.NotificationManager#cancel(int) cancel()} for a specific + notification ID. This method also deletes ongoing notifications. + </li> + <li> + You call {@link android.app.NotificationManager#cancelAll() cancelAll()}, which removes + all of the notifications you previously issued. + </li> +</ul> +<!-- ------------------------------------------------------------------------------------------ --> +<!-- ------------------------------------------------------------------------------------------ --> +<h2 id="NotificationResponse">Preserving Navigation when Starting an Activity</h2> +<p> + When you start an {@link android.app.Activity} from a notification, you must preserve the + user's expected navigation experience. Clicking <i>Back</i> should take the user back through + the application's normal work flow to the Home screen, and clicking <i>Recents</i> should show + the {@link android.app.Activity} as a separate task. To preserve the navigation experience, you + should start the {@link android.app.Activity} in a fresh task. How you set up the + {@link android.app.PendingIntent} to give you a fresh task depends on the nature of the + {@link android.app.Activity} you're starting. There are two general situations: +</p> +<dl> + <dt> + Regular activity + </dt> + <dd> + You're starting an {@link android.app.Activity} that's part of the application's normal + workflow. In this situation, set up the {@link android.app.PendingIntent} to + start a fresh task, and provide the {@link android.app.PendingIntent} with a back stack + that reproduces the application's normal <i>Back</i> behavior. + <p> + Notifications from the Gmail app demonstrate this. When you touch a notification for + a single email message, you see the message itself. Touching <b>Back</b> takes you + backwards through Gmail to the Home screen, just as if you had entered Gmail from the + Home screen rather than entering it from a notification. + </p> + <p> + This happens regardless of the application you were in when you touched the + notification. For example, if you're in Gmail composing a message, and you click a + notification for a single email, you go immediately to that email. Touching <i>Back</i> + takes you to the inbox and then the Home screen, rather than taking you to the + message you were composing. + </p> + </dd> + <dt> + Special activity + </dt> + <dd> + The user only sees this {@link android.app.Activity} if it's started from a notification. + In a sense, the {@link android.app.Activity} extends the notification by providing + information that would be hard to display in the notification itself. For this situation, + set up the {@link android.app.PendingIntent} to start in a fresh task. There's no need to + create a back stack, though, because the started {@link android.app.Activity} isn't part of + the application's activity flow. Clicking <i>Back</i> will still take the user to the + Home screen. + </dd> +</dl> +<!-- ------------------------------------------------------------------------------------------ --> +<h3 id="DirectEntry">Setting up a regular activity PendingIntent</h3> +<p> + To set up a {@link android.app.PendingIntent} that starts a direct entry + {@link android.app.Activity}, follow these steps: +</p> +<ol> + <li> + Define your application's {@link android.app.Activity} hierarchy in the manifest. + <ol style="list-style-type: lower-alpha;"> + <li> + Add support for API versions 15 and earlier. To do this, specify the parent of the + {@link android.app.Activity} you're starting by adding a +<code><a href="{@docRoot}guide/topics/manifest/meta-data-element.html"><meta-data></a></code> + element as the child of the +<code><a href="{@docRoot}guide/topics/manifest/activity-element.html"><activity></a></code>. + <p> + For this element, set +<code><a href="{@docRoot}guide/topics/manifest/meta-data-element.html#nm">android:name</a>="android.support.PARENT_ACTIVITY"</code>. + Set +<code><a href="{@docRoot}/guide/topics/manifest/meta-data-element.html#val">android:value</a>="<parent_activity_name>"</code> + where <code><parent_activity_name></code> is the value of +<code><a href="{@docRoot}guide/topics/manifest/meta-data-element.html#nm">android:name</a></code> + for the parent +<code><a href="{@docRoot}guide/topics/manifest/activity-element.html"><activity></a></code> + element. See the following XML for an example. + </p> + </li> + <li> + Also add support for API versions 16 and later. To do this, add the +<code><a href="{@docRoot}guide/topics/manifest/activity-element.html#parent">android:parentActivityName</a></code> + attribute to the +<code><a href="{@docRoot}guide/topics/manifest/activity-element.html"><activity></a></code> + element of the {@link android.app.Activity} you're starting. + </li> + </ol> + <p> + The final XML should look like this: + </p> <pre> -notification.defaults |= Notification.DEFAULT_LIGHTS; +<activity + android:name=".MainActivity" + android:label="@string/app_name" > + <intent-filter> + <action android:name="android.intent.action.MAIN" /> + <category android:name="android.intent.category.LAUNCHER" /> + </intent-filter> +</activity> +<activity + android:name=".ResultActivity" + android:parentActivityName=".MainActivity"> + <meta-data + android:name="android.support.PARENT_ACTIVITY" + android:value=".MainActivity"/> +</activity> </pre> - -<p>To define your own color and pattern, define a value for the <var>ledARGB</var> field -(for the color), the <var>ledOffMS</var> field (length of time, in milliseconds, to -keep the light off), the <var>ledOnMS</var> (length of time, in milliseconds, to keep the light on), -and also add {@link android.app.Notification#FLAG_SHOW_LIGHTS} to the <var>flags</var> field:</p> + </li> + <li> + Create a back stack based on the {@link android.content.Intent} that starts the + {@link android.app.Activity}: + <ol style="list-style-type: lower-alpha;"> + <li> + Create the {@link android.content.Intent} to start the {@link android.app.Activity}. + </li> + <li> + Create a stack builder by calling {@link android.app.TaskStackBuilder#create + TaskStackBuilder.create()}. + </li> + <li> + Add the back stack to the stack builder by calling + {@link android.support.v4.app.TaskStackBuilder#addParentStack addParentStack()}. + For each {@link android.app.Activity} in the hierarchy you've defined in the + manifest, the back stack contains an {@link android.content.Intent} object that + starts the {@link android.app.Activity}. This method also adds flags that start the + stack in a fresh task. + <p class="note"> + <strong>Note:</strong> Although the argument to + {@link android.support.v4.app.TaskStackBuilder#addParentStack addParentStack()} + is a reference to the started {@link android.app.Activity}, the method call + doesn't add the {@link android.content.Intent} that starts the + {@link android.app.Activity}. Instead, that's taken care of in the next step. + </p> + </li> + <li> + Add the {@link android.content.Intent} that starts the {@link android.app.Activity} + from the notification, by calling + {@link android.support.v4.app.TaskStackBuilder#addNextIntent addNextIntent()}. + Pass the {@link android.content.Intent} you created in the first step as the + argument to + {@link android.support.v4.app.TaskStackBuilder#addNextIntent addNextIntent()}. + </li> + <li> + If you need to, add arguments to {@link android.content.Intent} objects on the + stack by calling {@link android.support.v4.app.TaskStackBuilder#editIntentAt + TaskStackBuilder.editIntentAt()}. This is sometimes necessary to ensure that the + target {@link android.app.Activity} displays meaningful data when the user navigates + to it using <i>Back</i>. + </li> + <li> + Get a {@link android.app.PendingIntent} for this back stack by calling + {@link android.support.v4.app.TaskStackBuilder#getPendingIntent getPendingIntent()}. + You can then use this {@link android.app.PendingIntent} as the argument to + {@link android.support.v4.app.NotificationCompat.Builder#setContentIntent + setContentIntent()}. + </li> + </ol> + </li> +</ol> +<p> + The following code snippet demonstrates the process: +</p> <pre> -notification.ledARGB = 0xff00ff00; -notification.ledOnMS = 300; -notification.ledOffMS = 1000; -notification.flags |= Notification.FLAG_SHOW_LIGHTS; +... +Intent resultIntent = new Intent(this, ResultActivity.class); +TaskStackBuilder stackBuilder = TaskStackBuilder.create(this); +// Adds the back stack +stackBuilder.addParentStack(ResultActivity.class); +// Adds the Intent to the top of the stack +stackBuilder.addNextIntent(resultIntent); +// Gets a PendingIntent containing the entire back stack +PendingIntent resultPendingIntent = + stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT); +... +NotificationCompat.Builder builder = new NotificationCompat.Builder(this); +builder.setContentIntent(resultPendingIntent); +NotificationManager mNotificationManager = + (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); +mNotificationManager.notify(id, builder.build()); </pre> - -<p>In this example, the green light repeatedly flashes on for 300 milliseconds and -turns off for one second. Not every color in the spectrum is supported by the -device LEDs, and not every device supports the same colors, so the hardware -estimates to the best of its ability. Green is the most common notification color.</p> - - -<h3 id="More">More features</h3> - -<p>You can add several more features to your notifications -using {@link android.app.Notification} fields and flags. Some useful features include the -following:</p> - -<dl> - <dt>{@link android.app.Notification#FLAG_AUTO_CANCEL} flag</dt> - <dd>Add this to the <var>flags</var> field to automatically cancel the notification - after it is selected from the notifications window.</dd> - <dt>{@link android.app.Notification#FLAG_INSISTENT} flag</dt> - <dd>Add this to the <var>flags</var> field to repeat the audio until the - user responds.</dd> - <dt>{@link android.app.Notification#FLAG_ONGOING_EVENT} flag</dt> - <dd>Add this to the <var>flags</var> field to group the notification under the "Ongoing" - title in the notifications window. This indicates that the application is on-going — - its processes are still running in the background, even when the application is not - visible (such as with music or a phone call).</dd> - <dt>{@link android.app.Notification#FLAG_NO_CLEAR} flag</dt> - <dd>Add this to the <var>flags</var> field to indicate that the notification should - <em>not</em> be cleared by the "Clear notifications" button. This is particularly useful if - your notification is on-going.</dd> - <dt>{@link android.app.Notification#number} field</dt> - <dd>This value indicates the current number of events represented by the notification. - The appropriate number is overlaid on top of the status icon. - If you intend to use this field, then you must start with "1" when the Notification is first - created. (If you change the value from zero to anything greater during an update, the number - is not shown.)</dd> - <dt>{@link android.app.Notification#iconLevel} field</dt> - <dd>This value indicates the current level of a - {@link android.graphics.drawable.LevelListDrawable} that is used for the notification icon. - You can animate the icon in the status bar by changing this value to correlate with the - drawable's defined in a LevelListDrawable. See the {@link android.graphics.drawable.LevelListDrawable} - reference for more information.</dd> -</dl> - -<p>See the {@link android.app.Notification} class reference for more information about additional -features that you can customize for your application.</p> - - -<h2 id="CustomExpandedView">Creating a Custom Notification Layout</h2> - -<div class="figure" style="width:200px;margin-top:0"> -<img src="{@docRoot}images/custom_message.png" alt="" /> -<p class="img-caption"><strong>Figure 3.</strong> Notification with a custom layout.</p> -</div> - -<p>By default, the notification that appears in the notifications window includes a title -and the message text. -These are defined by the <var>contentTitle</var> and <var>contentText</var> -parameters of the {@link android.app.Notification#setLatestEventInfo(Context,CharSequence,CharSequence,PendingIntent) -setLatestEventInfo()} method. However, you can also define a custom layout for the -notification using -{@link android.widget.RemoteViews}. Figure 3 shows an example of a -custom notification layout. It looks similar to the default notification, but is -actually created with a custom XML layout.</p> - -<p>To define your own layout for the notification, -instantiate a {@link android.widget.RemoteViews} object that inflates a custom layout file, then -pass the {@link android.widget.RemoteViews} to the <var>contentView</var> field of your -Notification.</p> - -<p>Creating a custom notification layout is best understood with an example:</p> - +<!-- ------------------------------------------------------------------------------------------ --> +<h3 id="ExtendedNotification">Setting up a special activity PendingIntent</h3> +<p> + The following section describes how to set up a special activity + {@link android.app.PendingIntent}. +</p> +<p> + A special {@link android.app.Activity} doesn't need a back stack, so you don't have to + define its {@link android.app.Activity} hierarchy in the manifest, and you don't have + to call + {@link android.support.v4.app.TaskStackBuilder#addParentStack addParentStack()} to build a + back stack. Instead, use the manifest to set up the {@link android.app.Activity} task options, + and create the {@link android.app.PendingIntent} by calling + {@link android.app.PendingIntent#getActivity getActivity()}: +</p> <ol> - <li>Create the XML layout for the notification. - For example, the following layout is called <code>custom_notification.xml</code>: + <li> + In your manifest, add the following attributes to the +<code><a href="{@docRoot}guide/topics/manifest/activity-element.html"><activity></a></code> + element for the {@link android.app.Activity} + <dl> + <dt> +<code><a href="guide/topics/manifest/activity-element.html#nm">android:name</a>="<i>activityclass</i>"</code> + </dt> + <dd> + The activity's fully-qualified class name. + </dd> + <dt> +<code><a href="{@docRoot}guide/topics/manifest/activity-element.html#aff">android:taskAffinity</a>=""</code> + </dt> + <dd> + Combined with the + {@link android.content.Intent#FLAG_ACTIVITY_NEW_TASK FLAG_ACTIVITY_NEW_TASK} flag + that you set in code, this ensures that this {@link android.app.Activity} doesn't + go into the application's default task. Any existing tasks that have the + application's default affinity are not affected. + </dd> + <dt> +<code><a href="{@docRoot}guide/topics/manifest/activity-element.html#exclude">android:excludeFromRecents</a>="true"</code> + </dt> + <dd> + Excludes the new task from <i>Recents</i>, so that the user can't accidentally + navigate back to it. + </dd> + </dl> + <p> + This snippet shows the element: + </p> <pre> -<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" - android:id="@+id/layout" - android:layout_width="fill_parent" - android:layout_height="fill_parent" - android:padding="10dp" > - <ImageView android:id="@+id/image" - android:layout_width="wrap_content" - android:layout_height="fill_parent" - android:layout_alignParentLeft="true" - android:layout_marginRight="10dp" /> - <TextView android:id="@+id/title" - android:layout_width="wrap_content" - android:layout_height="wrap_content" - android:layout_toRightOf="@id/image" - style="@style/NotificationTitle" /> - <TextView android:id="@+id/text" - android:layout_width="wrap_content" - android:layout_height="wrap_content" - android:layout_toRightOf="@id/image" - android:layout_below="@id/title" - style="@style/NotificationText" /> -</RelativeLayout> +<activity + android:name=".ResultActivity" +... + android:launchMode="singleTask" + android:taskAffinity="" + android:excludeFromRecents="true"> +</activity> +... </pre> - - <p>Notice that the two {@link android.widget.TextView} elements include the {@code style} -attribute. It's important that you use style resources for the text in your custom -notifications, because the background color of the notification can vary across different -devices and platform versions. Beginning with Android 2.3 (API level 9), the system defines a -style for the text it uses for the default notification layouts. Thus, you should apply -that style when running on Android 2.3 or higher to ensure that your text is visible against -the background.</p> - - <p>For example, to use the standard text colors on versions of Android lower than 2.3, you -should use the following styles for {@code res/values/styles.xml}:</p> + </li> + <li> + Build and issue the notification: + <ol style="list-style-type: lower-alpha;"> + <li> + Create an {@link android.content.Intent} that starts the + {@link android.app.Activity}. + </li> + <li> + Set the {@link android.app.Activity} to start in a new, empty task by calling + {@link android.content.Intent#setFlags setFlags()} with the flags + {@link android.content.Intent#FLAG_ACTIVITY_NEW_TASK FLAG_ACTIVITY_NEW_TASK} + and + {@link android.content.Intent#FLAG_ACTIVITY_CLEAR_TASK FLAG_ACTIVITY_CLEAR_TASK}. + </li> + <li> + Set any other options you need for the {@link android.content.Intent}. + </li> + <li> + Create a {@link android.app.PendingIntent} from the {@link android.content.Intent} + by calling {@link android.app.PendingIntent#getActivity getActivity()}. + You can then use this {@link android.app.PendingIntent} as the argument to + {@link android.support.v4.app.NotificationCompat.Builder#setContentIntent + setContentIntent()}. + </li> + </ol> + <p> + The following code snippet demonstrates the process: + </p> <pre> -<?xml version="1.0" encoding="utf-8"?> -<resources> - <style name="NotificationText"> - <item name="android:textColor">?android:attr/textColorPrimary</item> - </style> - <style name="NotificationTitle"> - <item name="android:textColor">?android:attr/textColorPrimary</item> - <item name="android:textStyle">bold</item> - </style> - <!-- If you want a slightly different color for some text, - consider using ?android:attr/textColorSecondary --> -</resources> +// Instantiate a Builder object. +NotificationCompat.Builder builder = new NotificationCompat.Builder(this); +// Creates an Intent for the Activity +Intent notifyIntent = + new Intent(new ComponentName(this, ResultActivity.class)); +// Sets the Activity to start in a new, empty task +notifyIntent.setFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK); +// Creates the PendingIntent +PendingIntent notifyIntent = + PendingIntent.getActivity( + this, + 0, + notifyIntent + PendingIntent.FLAG_UPDATE_CURRENT +); + +// Puts the PendingIntent into the notification builder +builder.setContentIntent(notifyIntent); +// Notifications are issued by sending them to the +// NotificationManager system service. +NotificationManager mNotificationManager = + (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); +// Builds an anonymous Notification object from the builder, and +// passes it to the NotificationManager +mNotificationManager.notify(id, builder.build()); </pre> - <p>Then, to apply the system's default colors for notifications on Android -2.3 and higher, use the following styles for {@code res/values-v9/styles.xml}:</p> + </li> +</ol> +<!-- ------------------------------------------------------------------------------------------ --> +<!-- ------------------------------------------------------------------------------------------ --> +<h2 id="Progress">Displaying Progress in a Notification</h2> +<p> + Notifications can include an animated progress indicator that shows users the status + of an ongoing operation. If you can estimate how long the operation takes and how much of it + is complete at any time, use the "determinate" form of the indicator + (a progress bar). If you can't estimate the length of the operation, use the + "indeterminate" form of the indicator (an activity indicator). +</p> +<p> + Progress indicators are displayed with the platform's implementation of the + {@link android.widget.ProgressBar} class. +</p> +<p> + To use a progress indicator, call + {@link android.support.v4.app.NotificationCompat.Builder#setProgress setProgress()}. The + determinate and indeterminate forms are described in the following sections. +</p> +<!-- ------------------------------------------------------------------------------------------ --> +<h3 id="FixedProgress">Displaying a fixed-duration progress indicator</h3> +<p> + To display a determinate progress bar, add the bar to your notification by calling + {@link android.support.v4.app.NotificationCompat.Builder#setProgress setProgress() + setProgress(max, progress, false)} and then issue the notification. As your operation proceeds, + increment <code>progress</code>, and update the notification. At the end of the operation, + <code>progress</code> should equal <code>max</code>. A common way to call + {@link android.support.v4.app.NotificationCompat.Builder#setProgress setProgress()} + is to set <code>max</code> to 100 and then increment <code>progress</code> as a + "percent complete" value for the operation. +</p> +<p> + You can either leave the progress bar showing when the operation is done, or remove it. In + either case, remember to update the notification text to show that the operation is complete. + To remove the progress bar, call + {@link android.support.v4.app.NotificationCompat.Builder#setProgress setProgress() + setProgress(0, 0, false)}. For example: +</p> <pre> -<?xml version="1.0" encoding="utf-8"?> -<resources> - <style name="NotificationText" parent="android:TextAppearance.StatusBar.EventContent" /> - <style name="NotificationTitle" parent="android:TextAppearance.StatusBar.EventContent.Title" /> -</resources> +... +mNotifyManager = + (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); +mBuilder = new NotificationCompat.Builder(this); +mBuilder.setContentTitle("Picture Download") + .setContentText("Download in progress") + .setSmallIcon(R.drawable.ic_notification); +// Start a lengthy operation in a background thread +new Thread( + new Runnable() { + @Override + public void run() { + int incr; + // Do the "lengthy" operation 20 times + for (incr = 0; incr <= 100; incr+=5) { + // Sets the progress indicator to a max value, the + // current completion percentage, and "determinate" + // state + mBuilder.setProgress(100, incr, false); + // Displays the progress bar for the first time. + mNotifyManager.notify(0, mBuilder.build()); + // Sleeps the thread, simulating an operation + // that takes time + try { + // Sleep for 5 seconds + Thread.sleep(5*1000); + } catch (InterruptedException e) { + Log.d(TAG, "sleep failure"); + } + } + // When the loop is finished, updates the notification + mBuilder.setContentText("Download complete") + // Removes the progress bar + .setProgress(0,0,false); + mNotifyManager.notify(ID, mBuilder.build()); + } + } +// Starts the thread by calling the run() method in its Runnable +).start(); </pre> - <p>Now, when running on Android 2.3 (API level 9) or higher, the text in your custom view will -use the same colors that the system does for default notifications. This is important because later -versions of Android actually change the background color of the notifications to be dark. Inheriting -the system's styles ensures that your text will be light in such cases, but also if the background -is some other unexpected color, your text will also change as appropriate.</p> - </li> - - <li>Now, in the application code, use the RemoveViews - methods to define the image and text. Then pass the RemoteViews object to the <var>contentView</var> - field of the Notification, as shown in this example: +<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> + To display an indeterminate activity indicator, add it to your notification with + {@link android.support.v4.app.NotificationCompat.Builder#setProgress setProgress(0, 0, true)} + (the first two arguments are ignored), and issue the notification. The result is an indicator + that has the same style as a progress bar, except that its animation is ongoing. +</p> +<p> + Issue the notification at the beginning of the operation. The animation will run until you + modify your notification. When the operation is done, call + {@link android.support.v4.app.NotificationCompat.Builder#setProgress setProgress() + setProgress(0, 0, false)} and then update the notification to remove the activity indicator. + Always do this; otherwise, the animation will run even when the operation is complete. Also + remember to change the notification text to indicate that the operation is complete. +</p> +<p> + To see how activity indicators work, refer to the preceding snippet. Locate the following lines: +</p> <pre> -RemoteViews contentView = new RemoteViews(getPackageName(), R.layout.custom_notification_layout); -contentView.setImageViewResource(R.id.image, R.drawable.notification_image); -contentView.setTextViewText(R.id.title, "Custom notification"); -contentView.setTextViewText(R.id.text, "This is a custom layout"); -notification.contentView = contentView; +// Sets the progress indicator to a max value, the current completion +// percentage, and "determinate" state +mBuilder.setProgress(100, incr, false); +// Issues the notification +mNotifyManager.notify(0, mBuilder.build()); </pre> - - <p>As shown here, pass the application's package name and the layout - resource ID to the RemoteViews constructor. Then, define the content for the ImageView and TextView, - using the {@link android.widget.RemoteViews#setImageViewResource(int, int) setImageViewResource()} - and {@link android.widget.RemoteViews#setTextViewText(int, CharSequence) setTextViewText()}. - In each case, pass the reference ID of the appropriate View object that you want to set, along with - the value for that View. Finally, the RemoteViews object is passed to the Notification in the - <var>contentView</var> field.</p> - </li> - - <li>Because you don't need the - {@link android.app.Notification#setLatestEventInfo(Context,CharSequence,CharSequence,PendingIntent) - setLatestEventInfo()} method when using a custom view, you must define the Intent for the Notification - with the <var>contentIntent</var> field, as in this example: +<p> + Replace the lines you've found with the following lines: +</p> <pre> -Intent notificationIntent = new Intent(this, MyClass.class); -PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0); -notification.contentIntent = contentIntent; + // Sets an activity indicator for an operation of indeterminate length +mBuilder.setProgress(0, 0, false); +// Issues the notification +mNotifyManager.notify(0, mBuilder.build()); </pre> - </li> - - <li>The notification can now be sent as usual: - <pre>mNotificationManager.notify(CUSTOM_VIEW_ID, notification);</pre> - </li> +<p> + The resulting indicator is shown in figure 7: +</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> + +<!-- ------------------------------------------------------------------------------------------ --> +<!-- ------------------------------------------------------------------------------------------ --> +<!-- ------------------------------------------------------------------------------------------ --> + +<!-- ------------------------------------------------------------------------------------------ --> +<h2 id="CustomNotification">Custom Notification Layouts</h2> +<p> + The notifications framework allows you to define a custom notification layout, which + defines the notification's appearance in a {@link android.widget.RemoteViews} object. + Custom layout notifications are similar to normal notifications, but they're based on a + {@link android.widget.RemoteViews} defined in a XML layout file. +</p> +<p> + To define a custom notification layout, start by instantiating a + {@link android.widget.RemoteViews} object that inflates an XML layout file. Then, + instead of calling methods such as + {@link android.support.v4.app.NotificationCompat.Builder#setContentTitle setContentTitle()}, + call {@link android.support.v4.app.NotificationCompat.Builder#setContent setContent()}. To set + content details in the custom notification, use the methods in + {@link android.widget.RemoteViews} to set the values of the view's children: +</p> +<ol> + <li> + Create an XML layout for the notification in a separate file. You can use any file name + you wish, but you must use the extension <code>.xml</code> + </li> + <li> + In your app, use {@link android.widget.RemoteViews} methods to define your notification's + icons and text. Put this {@link android.widget.RemoteViews} object into your + {@link android.support.v4.app.NotificationCompat.Builder} by calling + {@link android.support.v4.app.NotificationCompat.Builder#setContent setContent()}. Avoid + setting a background {@link android.graphics.drawable.Drawable} on your + {@link android.widget.RemoteViews} object, because your text color may become unreadable. + </li> </ol> - - -<p>The {@link android.widget.RemoteViews} class also includes methods that you can use to easily add -a {@link android.widget.Chronometer} or {@link android.widget.ProgressBar} -in your notification's layout. For more information about creating custom layouts for your -notification, refer to the {@link android.widget.RemoteViews} class reference.</p> - -<p class="caution"><strong>Caution:</strong> -When creating a custom notification layout, you must take special care to ensure that your -custom layout functions properly in different device orientations and resolutions. While this -advice applies to all View layouts created on Android, it is especially important in this case -because your layout real estate is very restricted. So don't make your custom layout too -complex and be sure to test it in various configurations.</p> - - - - +<p> + The {@link android.widget.RemoteViews} class also includes methods that you can use to easily + add a {@link android.widget.Chronometer} or {@link android.widget.ProgressBar} + to your notification's layout. For more information about creating custom layouts for your + notification, refer to the {@link android.widget.RemoteViews} reference documentation. +</p> +<p class="caution"> + <strong>Caution:</strong> When you use a custom notification layout, take special care to + ensure that your custom layout works with different device orientations and resolutions. While + this advice applies to all View layouts, it's especially important for notifications because + the space in the notification drawer is very restricted. Don't make your custom layout too + complex, and be sure to test it in various configurations. +</p> +<!-- ------------------------------------------------------------------------------------------ --> +<h4>Using style resources for custom notification text</h4> +<p> + Always use style resources for the text of a custom notification. The background color of the + notification can vary across different devices and platform versions, and using style resources + helps you account for this. Starting in API level 9, the system defined a style for the + standard notification layout text. 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