How to remove old notification channels?

Question

My app now has 3 notification channels, I want to remove 2 of them.
I thought simply not registering 2 channels would do the trick but when I open the notification settings on the Android device, the old channels still appear.
Is it possible to remove them? They have no use and can confuse the users.

Answer 1

Notification channels stay forever once they are created.

To remove them again, simply call deleteNotificationChannel() on the NotificationManager with the ID of the channel you want to delete:

notificationManager.deleteNotificationChannel("channel_id");