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Go to Settings » Channels » Mobile Apps and click Manage for Android Notification Categories. Click New Notification Category and complete the form.

Android - Notification limit dropped to 24 per app in Android 11 notification drawer - Stack Overflow.

ChannelId is a unique String to identify each NotificationChannel and is used in Notification. Builder (line 7) when constructing the Notification object. NotificationChannel settings, except channel name and description text, are immutable after it is submitted to NotificationManager at line 5.

Open the notification channel settings To provide your users easy access to these notification settings, add an item in your app's settings UI that opens these system settings. You can open the system settings for notification channels with an Intent that uses the ACTION_CHANNEL_NOTIFICATION_SETTINGS action.

Set the notification content 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: A small icon, set by setSmallIcon() . This is the only user-visible content that's required.

Create a notification channel Construct a NotificationChannel object with a unique channel ID, user-visible name, and importance level. Optionally, specify the description that the user sees in the system settings with setDescription() . Register the notification channel by passing it to createNotificationChannel() .

Notification categories allow your users to manage notification settings for each category that you have defined for your app, e.g., ?promotions? or ?breaking news?. Categories represent the Android notification channels that you implement in your app.

A title, set by setContentTitle() . The body text, set by setContentText() . The notification priority, set by setPriority() .