Flutter : Bad state: Stream has already been listened to

Question

    class MyPage extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return Defaul         


        

Answer 1

Just to sum up:

The main difference is broadcast() creates a Stream listenable for multiple sources but it needs to be listened for at least one source to start emitting items.

A Stream should be inert until a subscriber starts listening on it (using the [onListen] callback to start producing events).

asBroadcastStream turns an existing Stream into a multi listenable one but it doesn't need to be listened to start emitting since it calls onListen() under the hood.