在Flutter开发中,遇到“stream has already been listened to”这个错误通常意味着你尝试对一个已经被监听的Stream进行再次监听。这是不允许的,因为每个Stream实例通常只能被一个监听器(listener)监听。下面我将根据你的提示逐一解答你的问题: 1. 确认错误信息的含义 错误信息“stream has already been listened to”表...
StateError: Bad state: Stream has already been listened to. at _StreamController._subscribe(stream_controller.dart:686) at _ControllerStream._createSubscription(stream_controller.dart:837) at _StreamImpl.listen(stream_impl.dart:497) at new _ForwardingStreamSubscription(stream_pipe.dart:114) at _Fo...
flutter: Bad state: Stream has already been listened to. As for me, the best solution has added the result of this combine to new BehaviorSubject and listen new one. Don't forget to listen old one !!! classVisitsBloccextendsObject{Map<Visit,Location> visitAndLocation;VisitsBloc() { visitA...
Command flutter run --machine Steps to Reproduce ... ... ... Logs StateError: Bad state: Stream has already been listened to. #0
在普通的StreamController 里判断了如果 Stream 是 _isInitialState 的,也就是订阅过的,就直接报错 "Stream has already been listened to." ,只有未订阅的才创建 StreamSubscription 。 而在BroadcastStreamController 中去掉了这个方法变成了close 判断 StreamSubscription<T>_subscribe(voidonData(Tdata)?,Function?
在_StreamController里判断了如果Stream是_isInitialState的,也就是订阅过的,就直接报错"Stream has already been listened to.",只有未订阅的才创建StreamSubscription。 在_BroadcastStreamController中,_isInitialState的判断被去掉了,取而代之的是isClosed判断,并且在广播中,_sendData是一个forEach执行: ...
在_StreamController里判断了如果Stream是_isInitialState的,也就是订阅过的,就直接报错"Stream has already been listened to.",只有未订阅的才创建StreamSubscription。 在_BroadcastStreamController中,_isInitialState的判断被去掉了,取而代之的是isClosed判断,并且在广播中,_sendData是一个forEach执行: ...
Bad state: Stream has already been listened to. 解決策 StreamControllerではなく、BehaviorSubjectを使用することで解消 元のソースコード エラー解消前 import'dart:async';classCounterBloc{// inputfinal_actionController=StreamController<bool>();Sink<void>getchangeCountAction=>_actionController.sink;//out...
════════ Exception caught by widgets library ═══════════════════════ The following StateError was thrown building Builder: Bad state: Stream has already been listened to. 3 StreamSubscription StreamSubscription主要用来操作当前的监听事件,它提供了一些操作方法如下:...
Logs StateError: Bad state: Stream has already been listened to. #0 _StreamController._subscribe (dart:async/stream_controller.dart:686:7)#1 _ControllerStream._createSubscription (dart:async/stream_controller.dart:837:19)#2 _StreamImpl.listen (dart:async/stream_impl.dart:497:9)#3 _Socket.li...