zoukankan      html  css  js  c++  java
  • Bad state: Stream has already been listened to.

    https://stackoverflow.com/questions/51396769/flutter-bad-state-stream-has-already-been-listened-to

    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.

    Thank you Rémi Rousselet for your response. I exposed the broadcast stream by simply calling myStream.asBroadcastStream. But i am getting snapshot.hasData as null and the progressbar keeps moving as the streambuilder might not able to fetch the data. – Mercy peka J

    I have had the same issue when I used a result of Observable.combineLatest2 for StreamBuilder into Drawer:

    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 !!!

    class VisitsBlocc extends Object {
        Map<Visit, Location> visitAndLocation;
    
        VisitsBloc() {
            visitAndLocations.listen((data) {
                visitAndLocation = data;
            });
        }
    
        final _newOne = new BehaviorSubject<Map<Visit, Location>>();
    
        Stream<Map<Visit, Location>> get visitAndLocations => Observable.combineLatest2(_visits.stream, _locations.stream, (List<vis.Visit> visits, Map<int, Location> locations) {
            Map<vis.Visit, Location> result = {};
    
            visits.forEach((visit) {
                if (locations.containsKey(visit.skuLocationId)) {
                    result[visit] = locations[visit.skuLocationId];
                }
            });
    
            if (result.isNotEmpty) {
                _newOne.add(result);
            }
        });
    }



    I didn't use .broadcast because it slowed my UI.
  • 相关阅读:
    看懂Oracle执行计划
    pl/sql编译存储过程卡住的解决方法
    ORA-00604的解决方法
    ORACLE SYNONYM详解
    Oracle 用户权限管理方法
    “ORA-06550: 第 1 行, 第 7 列”解决方法
    oracle 存储过程给另一个用户的权限问题
    Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.3:compile
    eclipse maven maven-compiler-plugin 报错 完全解决
    如何用git把本地代码上传到github
  • 原文地址:https://www.cnblogs.com/pythonClub/p/10822287.html
Copyright © 2011-2022 走看看