Android - According to what Firebase refreshing token

Question

Maybe it is not important but I dont understood that when onTokenRefresh() function running.. Thank you

Edit : I m using FCM Notification on my Android project. My app send message to specific users with "registration token id"(I'm storing this). I worried about that when token id will change or is it literal values?

Answer 1

From the Firebase documentation:

Because the token could be rotated after initial startup, you are strongly recommended to retrieve the latest updated registration token.

The registration token may change when:

• The app deletes Instance ID
• The app is restored on a new device
• The user uninstalls/reinstall the app
• The user clears app data.