如何在同一页面中播放多个音频文件？

Question

我有一个聊天页面，用户可以在其中将文本、图像、音频和视频作为消息发送给其他用户。除了音频和视频，一切正常。在我的聊天应用程序中，允许用户使用 file_picker 插件选择音频文件。用户选择音频文件后，将其上传到服务器。然后服务器使用套接字事件发回音频文件。我的应用程序侦听套接字事件并根据消息类型生成消息视图。如果是文本消息，则会显示在文本小部件中。如果是音频消息，则会显示在音频小部件中。 audio_player 插件用于播放音频文件。当用户上传音频时，稍后会向在同一房间聊天的两个用户显示音频文件。如果它是单个音频文件，一切正常。如果用户上传另一个音频文件，如第二个音频，音频控制器会用上次上传的音频替换聊天视图中我的所有音频文件。用于音频的代码如下：

    //for audio files (This code has been placed in _ChatPageState)
  AnimationController _animationIconController1;
  AudioCache audioCache;
  AudioPlayer audioPlayer;
  Duration _duration = new Duration();
  Duration _position = new Duration();
  Duration _slider = new Duration(seconds: 0);
  double durationValue;
  bool isSongPlaying = false;
  bool isPlaying = false;

稍后，变量在initState()中被初始化

//for audio inside initState
_position = _slider;
_animationIconController1 = AnimationController(
  vsync: this,
  duration: Duration(milliseconds: 750),
  reverseDuration: Duration(milliseconds: 750),
);
audioPlayer = new AudioPlayer();
audioCache = new AudioCache(fixedPlayer: audioPlayer);
audioPlayer.durationHandler = (d) => setState(() {
  _duration = d;
});

audioPlayer.positionHandler = (p) => setState(() {
  _position = p;
});

接下来，如果用户从套接字侦听器接收到音频文件，则会显示一个音频小部件，以便用户可以播放该文件：

Widget audioMessage(int index) {
return Container(
  width: MediaQuery.of(context).size.width * 0.6,
  height: 30,
  child: Row(
    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
    children: [
      GestureDetector(
        onTap: () {
          setState(() {
            isPlaying ? _animationIconController1.reverse() : _animationIconController1.forward();
            isPlaying = !isPlaying;
          });
          // Add code to pause and play the music.
          if (!isSongPlaying){
            audioPlayer.play('some hidden link/file/${messages[index].message}');
            setState(() {
              isSongPlaying = true;
            });
          } else {
            audioPlayer.pause();
            setState(() {
              isSongPlaying = false;
            });
          }
        },
        child: ClipOval(
          child: Container(
            color: Colors.pink[600],
            child: Padding(
              padding: const EdgeInsets.all(8.0),
              child: AnimatedIcon(
                icon: isSongPlaying ==false ? AnimatedIcons.play_pause : AnimatedIcons.pause_play,
                size: 14,
                progress: _animationIconController1,
                color: Colors.white,
              ),
            ),
          ),
        ),
      ),
      Slider(
        activeColor: Colors.white,
        inactiveColor: Colors.grey,
        value: _position.inSeconds.toDouble(),
        max: _duration.inSeconds.toDouble(),
        onChanged: (double value) {
          seekToSeconds(value.toInt());
          value = value;
        },
      ),
    ],
  ),
);

}

我认为问题出在我的音频和动画控制器上。它只为一名玩家发起。那么我该如何解决这个问题。用户可以上传任意数量的音频。我如何为用户上传的尽可能多的音频文件动态创建音频控制器？

Answer 1

因此，我通过将所有音频代码移动到一个单独的 dart 文件中来完成此操作。请参阅下面的音频实现：

  class PlayAudio extends StatefulWidget {
  final String url;
  
  const PlayAudio({Key key, this.url}) : super(key: key);

  @override
  _PlayAudioState createState() => _PlayAudioState();
}

class _PlayAudioState extends State<PlayAudio> with TickerProviderStateMixin{
  //for audio files
  AnimationController _animationIconController1;
  AudioCache audioCache;
  AudioPlayer audioPlayer;
  Duration _duration = new Duration();
  Duration _position = new Duration();
  Duration _slider = new Duration(seconds: 0);
  double durationValue;
  bool isSongPlaying = false;
  bool isPlaying = false;

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    //for audio inside initState
    _position = _slider;
    _animationIconController1 = new AnimationController(
      vsync: this,
      duration: new Duration(milliseconds: 750),
      reverseDuration: new Duration(milliseconds: 750),
    );
    audioPlayer = new AudioPlayer();
    audioCache = new AudioCache(fixedPlayer: audioPlayer);
    audioPlayer.durationHandler = (d) => setState(() {
      _duration = d;
    });

    audioPlayer.positionHandler = (p) => setState(() {
      _position = p;
    });

    print('audio widget: ' + widget.url);
  }

  @override
  void dispose() {
    // TODO: implement dispose
    super.dispose();
    audioPlayer.dispose();
  }

  void seekToSeconds(int second) {
    Duration newDuration = Duration(seconds: second);
    audioPlayer.seek(newDuration);
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      width: MediaQuery.of(context).size.width * 0.6,
      height: 30,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          GestureDetector(
            onTap: () {
              setState(() {
                isPlaying ? _animationIconController1.reverse() : _animationIconController1.forward();
                isPlaying = !isPlaying;
              });
              // Add code to pause and play the music.
              if (!isSongPlaying){
                audioPlayer.play('${widget.url}');
                setState(() {
                  isSongPlaying = true;
                });
              } else {
                audioPlayer.pause();
                setState(() {
                  isSongPlaying = false;
                });
              }
            },
            child: ClipOval(
              child: Container(
                color: Colors.pink[600],
                child: Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: AnimatedIcon(
                    icon: AnimatedIcons.play_pause,
                    size: 14,
                    progress: _animationIconController1,
                    color: Colors.white,
                  ),
                ),
              ),
            ),
          ),
          Slider(
            activeColor: Colors.white,
            inactiveColor: Colors.grey,
            value: _position.inSeconds.toDouble(),
            max: _duration.inSeconds.toDouble(),
            onChanged: (double value) {
              seekToSeconds(value.toInt());
              value = value;
            },
          ),
        ],
      ),
    );
  }
}

现在这是一个单独的 class。现在，要播放多个音频文件，我所做的就是在需要的地方将上述文件调用到我的 main.dart 中。确保每次要播放新音频文件时都调用 'new'，只需传递一个 url。见下文：

new PlayAudio(url: 'some URL');

希望这有助于在同一页面中播放多个音频文件。仅供参考，我正在使用 https://pub.dev/packages/audioplayers

如何在同一页面中播放多个音频文件？

How to play more than one audio file in the same page in flutter?

audio

flutter