Unregistered token error after sending one notification

Question

I am facing this dramatic problem with my android app while using Firebase. 1. My app receives token on the first launch 2. I am able to send notification from firebase console to the registered token 3. If I try to send a notification again with the console just after step 2. It shows me "unregistered token" after 2nd attempt onwards.

I have all necessary configuration already there in the manifest and google service.json file is also in place with the correct configuration. I believe things are correct because the app is able to receive notification once and the problem starts coming only after that.

Update 1: If I uninstall app and reinstall it then also I am able to receive notification only once.

Those who wants to look at the code, this is how I am getting token:

@Override
public void onTokenRefresh() {

    //Getting registration token
     refreshedToken = FirebaseInstanceId.getInstance().getToken();

    //Displaying token on logcat
    Log.d(TAG, "Refreshed token: " + refreshedToken);
     saveDeviceToken(refreshedToken);
}

This gets calls only first launch and after that, I haven't seen it getting called (which I think is expected behavior).

OnMessage received also gets called on first notification and then it never gets called off:

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    Log.d("FCM", "From: " + remoteMessage.getFrom());

    if (remoteMessage.getNotification() != null) {
        Log.d("FCM", "Notification Message Body: " + remoteMessage.getNotification().getBody());
        sendNotification(remoteMessage.getNotification().getBody());
    }
}

Update 2 : Tried to hit the HTTP api of FCM using the same server key and token and got following response:

   {
  "multicast_id": 6286279702096230688,
  "success": 0,
  "failure": 1,
  "canonical_ids": 0,
  "results": [
    {
      "error": "NotRegistered"
    }
  ]
}

Just to avoid cross questions here are few more details:

• Android studio : v2.3.1
• Google play service version : 10.0.1
• Libraries included : core, database, storage, messaging - all is having same version as google play service 10.0.1

Update 3 : Firebase crash, database and storage is working in the same project (which shows that google service.json file is correct).

Please help me to get it fixed.

Answer 1

I remember facing the similar problem before. Here is what I did and its working smooth for me. Hope this helps,

PreferenceStore is a helper class to save, edit and delete shared preferences.

@Override
public void onTokenRefresh() {
    String token = FirebaseInstanceId.getInstance().getToken();
    Log.i(TAG, "New FCM Token: " + token);

    setup_flag = PreferenceStore.getBoolean(getApplicationContext(), PrefKeys.IS_FIRST_FCM_TOKEN);
    if (!setup_flag) {
        // save token and boolean value in shared preferences for 
        // the first time you run the app after install
        PreferenceStore.saveString(getApplicationContext(), "FCM_TOKEN", token);
        PreferenceStore.saveBoolean(getApplicationContext(), "IS_FIRST_FCM_TOKEN", true);
    } else {
        // other time your app loads, update the token (like call the API endpoint).
    }
}