Not able to listen to a broadcast Stream

Issue

My standard stream:

var stream = (StreamController<int>()..add(1)).stream;
stream.listen(print); // prints 1

My broadcast stream:

var stream = (StreamController<int>.broadcast()..add(1)).stream;
stream.listen(print); // doesn't print anything

Solution

Broadcast streams does not buffer events when there is no listener unlike standard streams. Declare the broadcast stream first, listen to it then add an event.

var controller= StreamController<int>.broadcast();
controller.stream.listen(print); 
controller.sink.add(1); // will print 1

Answered By – edenar

Answer Checked By – Terry (FlutterFixes Volunteer)