在Flutter中，获取URL但无法在视频播放器上显示视频，并出现错误

Question

我无法在UI中显示视频，但我得到URL，它显示一些“未处理的异常：坏状态：未来已经完成”

   List<String> videoList = [];
   
   VideoPlayerController _controller;

    @override
   void initState() {
super.initState();
getVideos(context);
  }

  @override
  Future<void> dispose() async {
  super.dispose();
  if (videoList != null && mounted) {
  await _controller.dispose();

   }
}

我要显示视频的代码：

        Container(
              height: 200.0,
              padding: EdgeInsets.symmetric(vertical: 15.0, horizontal: 15.0),
              child: ListView(
                //shrinkWrap: true,
                scrollDirection: Axis.horizontal,
                children: [
                  FutureBuilder (
                      future: hasInitialized,
                      builder: (context, snapshot){
                        if (snapshot.connectionState == ConnectionState.done) {
                          return new ListView.builder(
                            shrinkWrap: true,
                            scrollDirection: Axis.horizontal,
                              itemCount:videoList.length,
                              itemBuilder: (BuildContext context,int index){
                              return Container(
                                height: 180,
                                width: 180,
                                padding: EdgeInsets.all(10),
                                child: _controller.value.isInitialized ?

                                    Stack(
                                      children: [
                                        VideoPlayer(_controller),
                                        _ControlsOverlay(_controller),
                                        // AspectRatioVideo(_controller),
                                      ],
                                    )
                                    :Container()
                              );
                            }
                            );
                        } else {
                          return
                            //Text("No video");
                          Center(child: CircularProgressIndicator(),);
                        }
                      }
                  )
                ],
              ),

            ),

我获取视频网址的代码：

                Future  hasInitialized;
         Future<List<String>> getVideos(context) async {
       var document = await          FirebaseFirestore.instance.collection("users").
         doc(auth.currentUser.uid).get();
        List<String> videos = [];
      for (var item in document.data()['videos']) {
        videos.add(item);
             }
       setState(() {
         _controller =    VideoPlayerController.network(videoList.toString());
        // _controller =  VideoPlayerController.network(videoList[videos]);
       _controller.addListener(() {
          setState(() {});
         });
       hasInitialized = _controller.initialize();
       _controller.setLooping(false);
         _controller.initialize();
        });

      videoList= videos;
     print(videoList.length);
    print(videoList);
     return videos;
      }

我得到的错误：

[错误：flatter/lib/ui/ui\u dart\u state.cc（186）]未处理的html" target="_blank">异常：错误状态：未来已完成E/flatter（9697）：#0 _AsyncCompleter。完成（dart:async/future\u impl.dart:45:31）E/Flatter（9697）：#1个VideoPlayerController。初始化（包：video\u player/video\u player.dart:310:25）E/flatter（9697）：E/flatter（9697）：E/ExoPlayerImplInternal（9697）：播放错误E/ExoPlayerImplInternal（9697）：com.google.android.exoplayer2.ExoPlaybackException：源错误E/ExoPlayerImplInternal（9697）：在com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage（ExoPlayerImplInternal.java:554）E/ExoPlayerImplInternal（9697）：在android.os.Handler.dispatchMessage（Handler.java:102）E/ExoPlayerImplInternal（9697）：在android.os.Looper.loop（Looper.java:223）E/ExoPlayerImplInternal（9697）：在android.os.HandlerThread.run（HandlerThread.java:67）E/ExoPlayerImplInternal（9697）：由：com.google.android.exoplayer2.upstream引起。FileDataSource$FileDataSourceException:com.google.android.exoplayer2.upstream。FileDataSource$FileDataSourceException:java.io。FileNotFoundException:[]：打开失败：eNet（没有这样的文件或目录）E/ExoPlayerImplInternal（9697）：在com.google.android.exoplayer2.upstream.FileDataSource.open（FileDataSource.java:97）E/ExoPlayerImplInternal（9697）：在com.google.android.exoplayer2.upstream.DefaultDataSource.open（DefaultDataSource.java:199）E/ExoPlayerImplInternal（9697）：在com.google.android.exoplayer2.upstream.StatsDataSource.open（StatsDataSource.java:84）E/ExoPlayerImplInternal（9697）：位于com.google.android.exoplayer2.source.ProgressiveMediaPeriod$ExtractingLoadable.load（ProgressiveMediaPeriod.java:1013）E/ExoPlayerImplInternal（9697）：位于java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1167）E/ExoPlayerImplInternal（9697）：at java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:641）E/ExoPlayerImplInternal（9697）：at java.lang.Thread.run（Thread.java:923）E/ExoPlayerImplInternal（9697）：由com.google.android.exoplayer2.upstr。FileDataSource$FileDataSourceException:java.io。FileNotFoundException:[]：打开失败：eNet（没有这样的文件或目录）E/ExoPlayerImplInternal（9697）：在com.google.android.exoplayer2.upstream.FileDataSource.openLocalFile（FileDataSource.java:166）E/ExoPlayerImplInternal（9697）：在com.google.android.exoplayer2.upstream.FileDataSource.open（FileDataSource.java:89）E/ExoPlayerImplInternal（9697）：…7更多E/ExoPlayerImplInternal（9697）：原因：java.io。FileNotFoundException:[]：打开失败：eNote（没有这样的文件或目录）E/ExoPlayerImplInternal（9697）：在libcore.io.IoBridge.open（IoBridge.java:492）E/ExoPlayerImplInternal（9697）：在java.io.RandomAccessFile。（RandomAccessFile.java:289）E/ExoPlayerImplInternal（9697）：在java.io.RandomAccessFile。（RandomAccessFile.java:152）E/ExoPlayerImplInternal（9697）：在com.google.android.exoplayer2.upstream.FileDataSource.openLocalFile（FileDataSource.java:155）E/exoplayerimplininternal（9697）：…8更多E/exoplayerimplininternal（9697）：由：android.system引起。ErrnoException:open失败：enent（没有这样的文件或目录）E/ExoPlayerImplInternal（9697）：位于libcore.io.Linux。open（本机方法）E/exoplayerimplininternal（9697）：在libcore.io.ForwardingOs.open（ForwardingOs.java:166）E/exoplayerimplininternal（9697）：在libcore.io.BlockGuardOs.open（BlockGuardOs.java:254）E/exoplayerimplininternal（9697）：在libcore.io.ForwardingOs.open（ForwardingOs.java:166）E/exoplayerimplininternal（9697）：在android.app.ActivityThread$AndroidOs.open（ActivityThread.java:7542）E/ExoPlayerImplInternal（9697）：在libcore.io.IoBridge.open（IoBridge.java:478）E/ExoPlayerImplInternal（9697）：…11更多E/ExoPlayerImplInternal（9697）：播放错误

Answer 1

_controller.initialize（）；返回一个Future我猜。你调用了两次：

hasInitialized = _controller.initialize();
_controller.setLooping(false);
_controller.initialize();

这就是为什么你会得到：未来已经完成