Receive Event two times

[sumitb247software]

Hi @marcojakob
I'm using event_bus: ^1.1.0 in flutter.

From one page i'm fire event like eventBus.fire(CustomEvents.START_MEDIA_SYNC_EVENT);
and i'm listening event like

void getObserverData() {
eventBus.on().listen((event) => {print(event.toString())});
}
getObserverData() method is called from second screen build method.

I got the events two times.
I initialize bus like this EventBus eventBus = new EventBus(); in one dart file.

Can please help me?

Thanks with best regards,
Sumit Bhondave.

[marcojakob]

Your getObserverData() method is a strange thing. It doesn't return anything but installs a listener. So, if you call it two times, the listener is installed two times and you will receive the events two times.

[sumitb247software]

HI @marcojakob
Thank you for your response.
But where to install listener once in flutter.

Can please help me?

Thanks with best regards,
Sumit Bhondave.

[marcojakob]

Just include this line somewhere in the program and don't call it multiple times (except if you want to listen to it in multiple components):

eventBus.on().listen((event) => {print(event.toString())});

[sumitb247software]

HI @marcojakob
Issue is resolved. I install listener in initState().
Thank you.

Thanks with best regards,
Sumit Bhondave.

[xhidnoda]

i think install the eventBus.on on initState() cause problem... in my case i put in the initState() and when push to another pageFlutter the initState() is calling again my eventBus.on.
So i receive event two times. :( where is the correct way to put the listener of eventBus.on?

[marcojakob]

@xhidnoda I don't have experience with Flutter. But I know there is a dispose() function. If you register something in initState() you should probably cancel the subscription to the event bus in dispose().

[xhidnoda]

Ok i declare this:

StreamSubscription busEventListener;

Add listener like this in initState() :

busEventListener = eventBus.on<ClassEventResp>().listen((event) {
      _parseResponse(event.message);
    });

In dispone():

doctorEventListener.cancel();

But is not working..what is wrong? please help!

[marcojakob]

Sorry @xhidnoda. I can't provide much support here. But you should try debugging your application (or use logging) to see how many times you are registering for the same event.

[xhidnoda]

Sorry error of my code. I calledinitState()from my ListView many times. So I put the code logic outside the ListView, and it works perfect.

[devmanzur]

call eventBus.destroy(); on your dispose method