Starting with 8.0 (API level 26), notification badges (also known as notification dots) appear on a launcher icon when the associated app has an active notification. Users can long-press on the app icon to reveal the notifications (alongside any app shortcuts), as shown in figure 1.
These dots appear by default in launcher apps that support them and there's nothing your app needs to do. However, there might be situations in which you don't want the to notification dot to appear or you want to control exactly which notifications to appear there.
For example, you might want to disable notification badges in the following situations:
- Ongoing notifications: Most ongoing notifications, such as image processing, media playback controls, or current navigation instructions, don't make sense as a badge.
- Calendar reminders: Avoid badging events occurring at the current time.
- Clock or alarm events: Avoid badging notifications related to current alarms.
The following sample code illustrates how to hide badges for a notification channel:
String id = "my_channel_01"; CharSequence name = getString(R.string.channel_name); String description = getString(R.string.channel_description); int importance = NotificationManager.IMPORTANCE_LOW; NotificationChannel mChannel = new NotificationChannel(id, name, importance); mChannel.setDescription(description); mChannel.setShowBadge(false); NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); mNotificationManager.createNotificationChannel(mChannel);
Set custom notification count
By default, each notification increments a number displayed on the long- press menu (visible in figure 1), but you can override this number for your app. For example, this might be useful if you're using just one notification to represent multiple new messages but you want the count here to represent the number of total new messages.
To set a custom number, call
the notification, as shown here:
Notification notification = new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID) .setContentTitle("New Messages") .setContentText("You've received 3 new messages.") .setSmallIcon(R.drawable.ic_notify_status) .setNumber(messageCount) .build();
Modify a notification's long-press menu icon
The long-press menu displays the large or small icon associated with a
notification if available. By default, the system displays the large icon, but
you can call
Notification.Builder.setBadgeIconType() and pass in the
BADGE_ICON_SMALL constant to display
the small icon.
Notification notification = new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID) .setContentTitle("New Messages") .setContentText("You've received 3 new messages.") .setSmallIcon(R.drawable.ic_notify_status) .setBadgeIconType(NotificationCompat.BADGE_ICON_SMALL) .build();