How to handle FirebaseInstanceId.getInstance().getToken() = null

Question

I have just migrated to FCM. I have added my class that extends from FirebaseInstanceIdService to receive a refreshedToken as and when appropriate.

My question is sp

Answer 1

• if your device have no connection to the internet onTokenRefresh() is never called and you should notify to user his/her device has no internet connection
• firebase has its own network change listener and when a device connected to the internet then try to get token and return it, at this time you can tell your main activity by sending a local broadcast receiver that registration token is received.

use below codes:

    @Override
public void onTokenRefresh() {

    // Get updated InstanceID token.
    String refreshedToken = FirebaseInstanceId.getInstance().getToken();

    Log.d("FCN TOKEN GET", "Refreshed token: " + refreshedToken);

    final Intent intent = new Intent("tokenReceiver");
    // You can also include some extra data.
    final LocalBroadcastManager broadcastManager = LocalBroadcastManager.getInstance(this);
    intent.putExtra("token",refreshedToken);
    broadcastManager.sendBroadcast(intent);


}

in your main activity:

    public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash);
   LocalBroadcastManager.getInstance(this).registerReceiver(tokenReceiver,
            new IntentFilter("tokenReceiver"));

}

BroadcastReceiver tokenReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String token = intent.getStringExtra("token");
        if(token != null)
        {
            //send token to your server or what you want to do
        }

    }
};

}