ListView中的滑块和图标不一致音频播放器

如何解决ListView中的滑块和图标不一致音频播放器

我正在ListView中实现音频列表，但是在播放时它们确实会播放声音，但是滑块没有变化，只有列表中的第一个是移动的。即使我在列表中播放nth音频，也只有顶部做出反应。 （播放/暂停图标以及带有搜索功能的滑块）。这是library正在使用。

下面的图片演示了这种情况，我单击了第二个音频，声音是第二个音频的声音，而第一个是正在反应的声音：

我在状态下缺少什么，下面是音频小部件的代码：

class AudioWidget extends StatefulWidget {
  final message;
  final PlayerState desiredState;

  @override
  _AudioWidgetState createState() => _AudioWidgetState();

  AudioWidget(this.message,this.desiredState);
}

class _AudioWidgetState extends State<AudioWidget> with PlayerObserver {
  AudioPlayer audioPlayer = new AudioPlayer();
  PlayerState audioPlayerState = PlayerState.STOPPED;
  Duration duration = Duration(milliseconds: 1);
  Duration currentPlaybackPosition = Duration.zero;
  bool _loading = false;
  Audio _audioPlayer;

  get isPlaying => audioPlayerState == PlayerState.PLAYING;

  get isPaused =>
      audioPlayerState == PlayerState.PAUSED ||
          audioPlayerState == PlayerState.STOPPED;

  get durationText =>
      duration != null ? duration
          .toString()
          .split('.')
          .first : '';

  get positionText =>
      currentPlaybackPosition != null
          ? currentPlaybackPosition
          .toString()
          .split('.')
          .first
          : '';

  @override
  void initState() {
    super.initState();
    _audioPlayer = Audio.instance();
    listenForAudioPlayerEvents();
  }

  @override
  void didUpdateWidget(AudioWidget oldWidget) {
    // TODO: implement didUpdateWidget

    if (oldWidget.desiredState != widget.desiredState) {
      _onDesiredStateChanged(oldWidget);
    } else if (oldWidget.message != widget.message) {
      play(widget.message);
    }
    super.didUpdateWidget(oldWidget);
  }

  /// The [desiredState] flag has changed so need to update playback to
  /// reflect the new state.
  void _onDesiredStateChanged(AudioWidget oldWidget) async {
    switch (widget.desiredState) {
      case PlayerState.PLAYING:
        play(widget.message);
        break;
      case PlayerState.PAUSED:
        pause();
        break;
      case PlayerState.STOPPED:
        pause();
        break;
    }
  }

  @override
  void onPlay() {
    setState(() {
      audioPlayerState = PlayerState.PLAYING;
      _loading = false;
    });
  }

  @override
  void onPause() {
    setState(() {
      audioPlayerState = PlayerState.PAUSED;
    });
  }

  @override
  void onComplete() {
    setState(() {
      audioPlayerState = PlayerState.PAUSED;
      currentPlaybackPosition = Duration.zero;
    });
  }

  @override
  void onTime(int position) {
    setState(() {
      currentPlaybackPosition = Duration(seconds: position);
    });
  }

  @override
  void onSeek(int position,double offset) {
    super.onSeek(position,offset);
  }

  @override
  void onDuration(int duration) {
    if (duration <= 0) {
      setState(() {});
    } else {
      setState(() {
        this.duration = Duration(milliseconds: duration);
      });
    }
  }

  @override
  void dispose() {
    if (mounted) {
      _audioPlayer.dispose();
    }
    super.dispose();
  }

  Future play(url) async {


    setState(() {
      _loading = true;
    });
    await _audioPlayer.play(url,title: "voice note",position: currentPlaybackPosition,isLiveStream: false);
  }

  // Request audio pause
  Future<void> pause() async {
    _audioPlayer.pause();
    setState(() => audioPlayerState = PlayerState.PAUSED);
  }

  // Request audio stop. this will also clear lock screen controls
  Future<void> stop() async {
    _audioPlayer.reset();

    setState(() {
      audioPlayerState = PlayerState.STOPPED;
      currentPlaybackPosition = Duration.zero;
    });
  }

  // Seek to a point in seconds
  Future<void> seekTo(double milliseconds) async {
    setState(() {
      currentPlaybackPosition = Duration(milliseconds: milliseconds.toInt());
    });
    _audioPlayer.seekTo(milliseconds / 1000);
  }


  @override
  Widget build(BuildContext context) {
    print("-- $isPlaying");
    return Container(
      child: Row(
        children: <Widget>[
          Material(
            child: IconButton(
                onPressed: () {
                  if (isPlaying) {
                    pause();
                  } else {
                    play(widget.message);
                  }
                },icon: isPlaying ? Icon(Icons.pause) : Icon(Icons.play_arrow)),),duration != null
              ? Slider(
            value: currentPlaybackPosition?.inMilliseconds?.toDouble() ??
                0.0,onChanged:seekTo,min: 0.0,max: duration.inMilliseconds.toDouble(),activeColor: Colors.red[500],)
              : Slider(
            value: 0.0,inactiveColor: Colors.red[500],)
        ],);
  }
}

然后，我在列表中调用它以在ListView构建器的另一个有状态Widget中循环它。

我在状态方面缺少什么？