Under what circumstances will an app deletes Fireb

Question

FirebaseInstanceIdService.class clearly states that onTokenRefresh() will be called when:

• App deletes Instance ID
• App is restored on a new device
• User uninstalls/reinstall the app
• User clears app data

When and under what circumstances will an app deletes an instance ID? Is there a possibility of it happening while an app is still active (ongoing activity or service)?

Answer 1

The app deletes the Instance ID when you call FirebaseInstanceId.deleteInstanceId() in app:

Resets Instance ID and revokes all tokens.

And yes, you can call this method while your app is active.