react-native-notifications: [v3][Android] Opening app through background notification doesn't trigger appropriate event

Hi, I too had faced the same kind of issue so I am posting my findings here. First we need to understand when the notification is received and where it’s sent from as the behavior depends on both these aspects.

• Notification can be received by the App when it is either in Foreground/Background/Entirely Killed
• Notification might be sent using:

1. FCM console
2. AdminSDK/ Using a HTTP protocol like postman

Now let’s mix and match these cases and see from where we can get the payload:

• Foreground + Admin SDK -> registerNotificationOpened
• Foreground + FCM Console -> registerNotificationOpened
• Killed/Background + Admin SDk -> getInitialNotification
• Killed/Background + FCM -> This is where the issue lies

Now why does this occur: As per Handling Messages, the notifications that are generated using Admin SDK are received by this library code, whereas the notifications that are sent by the FCM console are received by the Firebase SDK and the notification is generated by it. Now in this case the data payload is delivered in the extras of the intent of your launcher Activity.

You can get this data from your launcher activity’s; This can be verified using: By adding this in your launcher activity; For the sake of simplicity the code considers a random timer of 10 seconds to allow the listener to be set otherwise the event will be emitted before the listener is attached, but you can get the data using some native method which gets called from the JS instead of this timer )

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Intent intent = getIntent();
    if (intent.getExtras() != null && intent.getExtras().keySet().contains("someparameterfromnotificationascheck")) {
        Log.d("Test", intent.getExtras().toString());
        JsIOHelper jsIOHelper = new JsIOHelper();
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                jsIOHelper.sendEventToJS("consolenotification", getIntent().getExtras(), getReactInstanceManager().getCurrentReactContext());
            }
        }, 10000);
    }
}

And by adding this in your JS where you want the notification

this.emitter = new NativeEventEmitter(NativeModules.RNEventEmitter);
    this.emitter.addListener("consolenotification", (data) => {
      alert("consolenotification" + JSON.stringify(data));
    });

So this is kind of a hacky solution, but it works

Edit: If your sending the notification from console and the app is killed https://github.com/wix/react-native-notifications/issues/326#issuecomment-507371366 might work, worked for me;

Although it does not work in one case: App Killed -> Notification Received from the console -> App Opened via launcher -> Clicked on the notification This does not do anything as the OnCreate event has already passed.

Currently, I ended up having a “pushNotification” key against a blank value in the Firebase Console’s Additional Options, until I find a better way to do this. The purpose of the key is that the library takes some decisions based on this key and it just needs to to be present to satisfy a condition which was failing

I also see this issue. On Android, with the app in the background, and the notification sent through FCM, tapping the notification opens the app, but no event is raised. When the app is killed, it works, although getInitialNotification takes a long time before it runs.