Flutter : Bad state: Stream has already been listened to

Question

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


        

Answer 1

The most common form of Stream can be listened only once at a time. If you try to add multiple listeners, it will throw

Bad state: Stream has already been listened to

To prevent this error, expose a broadcast Stream. You can convert your stream to a broadcast using myStream.asBroadcastStream

This needs to be done inside your class that expose Stream. Not as parameter of StreamBuilder. Since asBroadcastStream internally listen to the original stream to generate the broadcast one, this imply you can't call this method twice on the same stream.