无法收听广播流

Question

我的标准流：

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

我的直播流：

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

Answer 1

与标准流不同，当没有侦听器时，广播流不会缓冲事件。先声明广播流，监听后添加事件

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

Not able to listen to a broadcast Stream