Download notification android

For more details about each part of a notification, read about the notification anatomy. To get started, you need to set the notification's content and channel using a NotificationCompat. Builder object. The following example shows how to create a notification with the following:. Notice that the NotificationCompat. Builder constructor requires that you provide a channel ID. This is required for compatibility with Android 8. By default, the notification's text content is truncated to fit one line.

If you want your notification to be longer, you can enable an expandable notification by adding a style template with setStyle. For example, the following code creates a larger text area:. For more information about other large notification styles, including how to add an image and media playback controls, see Create a Notification with Expandable Detail. Before you can deliver the notification on Android 8. Because you must create the notification channel before posting any notifications on Android 8.

It's safe to call this repeatedly because creating an existing notification channel performs no operation. Notice that the NotificationChannel constructor requires an importance , using one of the constants from the NotificationManager class. This parameter determines how to interrupt the user for any notification that belongs to this channel—though you must also set the priority with setPriority to support Android 7.

In some cases the system might change the importance level based other factors, and the user can always redefine what the importance level is for a given channel. For more information about what the different levels mean, read about notification importance levels. Every notification should respond to a tap, usually to open an activity in your app that corresponds to the notification. To do so, you must specify a content intent defined with a PendingIntent object and pass it to setContentIntent.

The following snippet shows how to create a basic intent to open an activity when the user taps the notification:. Notice this code calls setAutoCancel , which automatically removes the notification when the user taps it.

The setFlags method shown above helps preserve the user's expected navigation experience after they open your app via the notification. But whether you want to use that depends on what type of activity you're starting, which may be one of the following:. For more about the different ways to configure your notification's intent, read Start an Activity from a Notification. To make the notification appear, call NotificationManagerCompat.

For example:. A notification can offer up to three action buttons that allow the user to respond quickly, such as snooze a reminder or even reply to a text message. But these action buttons should not duplicate the action performed when the user taps the notification. Figure 2. A notification with one action button. To add an action button, pass a PendingIntent to the addAction method. This is just like setting up the notification's default tap action, except instead of launching an activity, you can do a variety of other things such as start a BroadcastReceiver that performs a job in the background so the action does not interrupt the app that's already open.

For more information about building a BroadcastReceiver to run background work, see the Broadcasts guide. If you're instead trying to build a notification with media playback buttons such as to pause and skip tracks , see how to create a notification with media controls. The direct reply action, introduced in Android 7. For example, you can use a direct reply action to let users reply to text messages or update task lists from within the notification. Figure 3. Tapping the "Reply" button opens the text input.

The direct reply action appears as an additional button in the notification that opens a text input. When the user finishes typing, the system attaches the text response to the intent you had specified for the notification action and sends the intent to your app.

Caution: If you re-use a PendingIntent , a user may reply to a different conversation than the one they thought they did. You must either provide a request code that is different for each conversation or provide an intent that doesn't return true when you call equals on the reply intent of any other conversation. The conversation ID is frequently passed as part of the intent's extras bundle, but is ignored when you call equals. The system prompts the user to input a response when they trigger the notification action, as shown in figure 3.

To receive user input from the notification's reply UI, call RemoteInput. This is necessary to hide direct reply UI and confirm to the user that their reply was received and processed correctly. When working with this new notification, use the context that's passed to the receiver's onReceive method. You should also append the reply to the bottom of the notification by calling setRemoteInputHistory.

For more advice for notifications from a messaging apps, see best practices for messaging apps. Notifications can include an animated progress indicator that shows users the status of an ongoing operation. Figure 4. The progress bar during and after the operation. If you can estimate how much of the operation is complete at any time, use the "determinate" form of the indicator as shown in figure 4 by calling setProgress max, progress, false.

The first parameter is what the "complete" value is such as ; the second is how much is currently complete, and the last indicates this is a determinate progress bar. As your operation proceeds, continuously call setProgress max, progress, false with an updated value for progress and re-issue the notification. At the end of the operation, progress should equal max. 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 setProgress 0, 0, false. To display an indeterminate progress bar a bar that does not indicate percentage complete , call setProgress 0, 0, true. The result is an indicator that has the same style as the progress bar above, except the progress bar is a continuous animation that does not indicate completion.

The progress animation runs until you call setProgress 0, 0, false and then update the notification to remove the activity indicator. Android uses some pre-defined system-wide categories to determine whether to disturb the user with a given notification when the user has enabled Do Not Disturb mode.

This information about your notification category is used by the system to make decisions about displaying your notification when the device is in Do Not Disturb mode.

However, you are not required to set a system-wide category and should only do so if your notifications match one of the categories defined by in NotificationCompat.

Your app might need to display an urgent, time-sensitive message, such as an incoming phone call or a ringing alarm. In these situations, you can associate a full-screen intent with your notification. When the notification is invoked, users see one of the following, depending on the device's lock status:. The following code snippet demonstrates how to associate your notification with a full-screen intent:.

To control the level of detail visible in the notification from the lock screen, call setVisibility and specify one of the following values:. For example, an SMS app might display a notification that shows You have 3 new text messages , but hides the message contents and senders.

To provide this alternative notification, first create the alternative notification with NotificationCompat. Builder as usual. Then attach the alternative notification to the normal notification with setPublicVersion. However, the user always has final control over whether their notifications are visible on the lock screen and can even control that based on your app's notification channels.

To update this notification after you've issued it, call NotificationManagerCompat. If the previous notification has been dismissed, a new notification is created instead. You can optionally call setOnlyAlertOnce so your notification interupts the user with sound, vibration, or visual clues only the first time the notification appears and not for later updates. Use the best practices listed here as a quick reference of what to keep in mind when creating notifications for your messaging and chat apps.

Starting in Android 7. Using the NotificationCompat. MessagingStyle class, you can change several of the labels displayed on the notification, including the conversation title, additional messages, and the content view for the notification. The following code snippet demonstrates how to customize a notification's style using the MessagingStyle class.

Starting in Android 8. MessagingStyle class display more content in their collapsed form. You can also use the addHistoricMessage method to provide context to a conversation by adding historic messages to messaging-related notifications. When using NotificationCompat. MessagingStyle :. Content and code samples on this page are subject to the licenses described in the Content License. App Basics. Build your first app. App resources. Resource types.

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