How to detect a Notification Channel is blocked by user in Android 8.0

Question

Is there any callback my application receives when user blocks a Notification Channel created by my application OR it can be detected later ?

Piassava

Answer 1

No, there is no such listener provided by the APIs. You will have to check each time before you make a notification.

From the developer document

To find out if a user blocked a notification channel, you can call getImportance(). If the notification channel is blocked, getImportance() returns IMPORTANCE_NONE.

Snob

Answer 2

Starting from Android P, there is a system broadcast for this: https://developer.android.com/reference/android/app/NotificationManager.html#ACTION_NOTIFICATION_CHANNEL_BLOCK_STATE_CHANGED

It's impossible to reliably sync our backend push servers with the channel settings without this (you have to poll...)

Meaning

Is it possible to register to it via the manifest? Or only during runtime? – Afterguard