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On this page

Appearances on a device

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A notification is a message that Android displays outside your app's UI to provide the user with reminders, communication from other people, or other timely information from your app. Users can tap the notification to open your app or take an action directly from the notification.


For more information about the design and interaction patterns, see the Notifications design guide. Additionally, see the Android Notifications Sample for a demonstration of best practices in using the Notification.Style API in both mobile and wearable apps.

Appearances on a device

Notifications appear to users in different locations and formats, such as an icon in the status bar, a more detailed entry in the notification drawer, as a badge on the app's icon, and on paired wearables automatically.

Status bar and notification drawer

When you issue a notification, it first appears as an icon in the status bar.






Figure 2. Notifications in the notification drawer

Users can drag down on a notification in the drawer to reveal the expanded view, which shows additional content and action buttons, if provided.

A notification remains visible in the notification drawer until dismissed by the app or the user.

Heads-up notification





The heads-up notification appears the moment your app issues the notification and it disappears after a moment, but remains visible in the notification drawer as usual.

Example conditions that might trigger heads-up notifications include the following:

The user's activity is in fullscreen mode (the app uses fullScreenIntent).


You can programmatically set the level of detail visible in notifications posted by your app on a secure lock screen, or even whether the notification will show on the lock screen at all.

Users can use the system settings to choose the level of detail visible in lock screen notifications, including the option to screen notifications. Starting with Android 8.0, users can choose to disable or enable lock screen notifications for each notification channel.








You can also enh customizing some appearances for the notification on wearables and provide different actions, including suggested replies and voice input replies. For more information, see how to add wearable-specific features to your notifica




However, if it's necessary to deliver multiple notifications, you should consider grouping those separate into a group (available on Android 7.0 and higher). A notification group allows you to collapse multiple notifications into just one post in the notification drawer, with a summary. The user can then expand the notification to reveal the details for each individual notification.

The user can progressively expand the notification group and each notification within it for

Note: The user interface refers to channels as "categories."

"foreground" state.



Posting
However, Android also applies a rate limit when updating a notification. If you post updates to a single notification too frequently (many in less than one second), the system might drop some updates.

Notification compatibility

API: NotificationCompat and its subclasses, as well as NotificationManagerCompat. This will allow you to avoid writing conditional code to check API levels because these APIs handle that for you.

NotificationCompat is updated as the
Introduced expandable notification templates (called notification styles), allowing for larger notification content area to display information. Users can use a one finger swipe up/down gesture to expand a notificat
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