Firebase onMessageReceived not called when app is

问题:

I am using Firebase for our messaging service in our Android app. I have researched Firebase quite a bit and I understand that whether the app if running in the foreground or now will change the type of data received in the onMessageReceived method.

What I am trying to accomplish is to parse the incoming data from the Remotemessage and do something different with it depending on custom tag. IE, if the Data Map contains a field called, "My_Custom_Tag", I want to completely override the standard firebase message that pops up and write a custom one.

The problem is, when the app is running in the background, any code I put into the onMessageReceived never gets triggered. It works just fine when the app is running in the foreground, but will not detect/ receive anything if the app is in the background.

Here is some sample code below:

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    super.onMessageReceived(remoteMessage);

    Map<String, String> aMap = remoteMessage.getData();
    //Custom object here for easier parsing
    PushNotificationsPojo pojo = this.convertResponseToPojo(aMap);

    if(pojo == null){
        passToFirebase(remoteMessage);
        return;
    }

    if(pojo.getData().getCustomTag().equals(PushNotificationsPojo.ID_TAG_CHAT_MESSAGE)) {
        createCustomNotification1(pojo);

    } else if (pojo.getData().getCustomTag().equals(PushNotificationsPojo.ID_TAG_SOME_OTHER_MESSAGE)){
        createCustomNotification2(pojo);

    } else if (pojo.getData().getCustomTag().equals(PushNotificationsPojo.ID_TAG_STUFF_AND_WHATNOT)) {
        createCustomNotification3(pojo);

    } else {
        passToFirebase(remoteMessage);
    }
}

My question is, how do I go about editing MyFirebaseMessagingService so that I can check the incoming data, determine tag info, and decide to either pass it on to firebase for so it can use the standard handling or not pass it to firebase and write my own custom display notification all while my app is running in the background?

Thanks all!

PS, any chance the Firebase-Dungeon-Master Frank van Puffelen has a thought?

回答1:

Remove the notification payload from your FCM messages in order to have the data payload delivered to the onMessageReceived method.

Read this and this carefully.

When your app is in the background, data payload delivered to the onMessageReceived method only if there is no notification payload. (Mark the words)

In case both payloads exist then system automatically handles the notification part (system tray) and your app gets the data payload in the extras of the intent of launcher Activity (after the user tap on the notification).

In order to be able to serve both platforms successfully, Android and iOS, you may have to send different FCM messages according to client's OS.

回答2:

Guyz Listen carefully, I gone through many links and finally found solution here.

1. When app is background onMessageReceived method should call

This payload will works...

{
  "data":{
    "title": "hello",
    "body": "this is body"
  },
  "to": "c5iuJ7iDnoc:APA91bG6j2c5tiQ3rVR9tBdrCTfDQYxkPwLuNFWzRuGHrBpWiOajR-DKef9EZEEVKA-kUBfXVcqHT-mClYfad06R_rBjhRZFKVdBL7_joXE5hFEwR45Qk8wgQdia2b-LmjI1IheFGZS8"
}

This payload will not work...

{
  "notification":{
    "title": "hello",
    "body": "this is body"
  },
  "to": "c5iuJ7iDnoc:APA91bG6j2c5tiQ3rVR9tBdrCTfDQYxkPwLuNFWzRuGHrBpWiOajR-DKef9EZEEVKA-kUBfXVcqHT-mClYfad06R_rBjhRZFKVdBL7_joXE5hFEwR45Qk8wgQdia2b-LmjI1IheFGZS8"
}

Because when the load contains "notification" onMessageReceived will not call

回答3:

In this post , answer of Koot might be your solution. He said "I had the same problem. It is easier to use the 'data message' instead of the 'notification'. The data message always load the class onMessageReceived."

my solution is as per his advice

{
  "condition": "'reader' in topics",

  "data": {
    "title":"Please Check",
    "message": "This is a Firebase Cloud Messaging Topic Message 5!"
   }
}

回答4:

Pretty sure, you already know the behavior in Android that when using both notification and data payload, the Android system catches what's in the notification and the data payload is included in the intent when it's tapped.

AFAIK, this is the only way that it goes (as per mentioned by @ArthurThompson here) and if you really want to make sure that onMessageReceived() is always called, you have to only use data payload (as mentioned by @DiegoGiorgini here) However, I've looked around, maybe there's another way.

I haven't tried it out myself, but have you considered checking which notifications are in the Status Bar, then if your notification exists (not entirely sure if you can actually identify which one is a notification for your app though), call the methods you usually call inside onMessageReceived().

One approach that you can also do is to detect if the device(s) you'll be sending the message to is an Android device in you app server, then send only a data payload.