Android Tutorial => Registration token

Example

On initial startup of your app, the FCM SDK generates a registration token for the client app instance.
If you want to target single devices or create device groups, you'll need to access this token by extending FirebaseInstanceIdService.

The onTokenRefresh callback fires whenever a new token is generated and you can use the method FirebaseInstanceID.getToken() to retrieve the current token.

Example:

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {

   /**
     * Called if InstanceID token is updated. This may occur if the security of
     * the previous token had been compromised. Note that this is called when the InstanceID token
     * is initially generated so this is where you would retrieve the token.
     */

    @Override
    public void onTokenRefresh() {
        // Get updated InstanceID token.
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
        Log.d(TAG, "Refreshed token: " + refreshedToken);

    }

}

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