如何使用 just_audio - flutter 正确播放音频文件

Question

我正在开发一个音乐应用程序，我想流式传输音频并播放我本地存储的文件。

正在使用 flutter，但并不擅长，实际上正在学习。

我想要的是在如何正确播放文件方面得到帮助，目的是播放提供给播放器路径的文件。下面是我的代码。

import 'package:myApp/shared/MusicProgressIndicator.dart';
import 'package:myApp/just_audio.dart';
import 'package:myApp/app.dart';

class SingleSongScreen extends StatefulWidget {
  static const String id = "SingleSongScreen";
  static var song = {};
  SingleSongScreen({Key key}) : super(key: key);

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

class _SingleSongScreenState extends State<SingleSongScreen> with TickerProviderStateMixin {
  Duration currentDuration = Duration(milliseconds: 1000);
  bool showRemaining = false;
  AnimationController controller;
  
  @override
  void initState() {
    controller = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 5),
    )..addListener(() {
        setState(() {});
      });
    controller.repeat(reverse: true);
    super.initState();
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final player  = AudioPlayer();
    var song      = SingleSongScreen.song;
    var songPath  = app.base+"play.php?file="+song['song'];
    print(song);
    print(songPath);
    
    player.stop();
    player.setUrl(songPath).then((play){
       player.play();
      print("Playing now");
    });

    return Window(
      backgroundColor: backgroundColor,
      header: Container(
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            IconicButton(
              icon: backIcon,
              iconColor: Colors.grey,
              transparent: true,
              circledIcon: false,
              size: 40,
              onClicked: () {
                goBack(context);
              },
            ),
            Favicon(onClicked: () {
              goto(page: MainScreen.id, context: context);
            }),
          ],
        ),
      ),
      body: [
        VerticalSpacer(
          h: 20,
        ),
        Container(
          height: 250,
          child: Carousel(
            boxFit: BoxFit.contain,
            autoplay: carouselAutoPlay,
            animationCurve: Curves.fastOutSlowIn,
            animationDuration: Duration(milliseconds: 1000),
            dotSize: 6.0,
            dotIncreasedColor: Color(0xFF33A3FF),
            dotBgColor: Colors.transparent,
            dotPosition: DotPosition.bottomCenter,
            dotVerticalPadding: 10.0,
            showIndicator: true,
            indicatorBgPadding: 7.0,
            images: images(),
          ),
        )
      ],
      footer: Container(
        child: Column(
          children: [
            Container(
              child: Marquee(
                child: Label(
                  song['title'],
                  bold: true,
                ),
              ),
            ),
            Container(
              child: Marquee(
                child: Label(
                  song['artist'],
                  bold: true,
                  color: Colors.grey,
                ),
              ),
            ),

            // ACTION ICONS SECTION
            VerticalSpacer(
              h: 25,
            ),
            Container(
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  VerticalIconicButton(
                    icon: FontAwesomeIcons.fileDownload,
                    label: "Download",
                    iconColor: Colors.grey,
                    textColor: Colors.grey,
                    scale: 1.2,
                    onClicked: (){
                      var downloadURL = songPath.replaceAll("play.php", "download.php");
                      app app2 = new app();
                      toast("Downloading a file "+song['song']);
                      app2.fetchServer({'method':'download','file':song['song']}).then((fileInfo){
                        if(fileInfo['status']=="success"){
                          toast("Download complete "+song['song']);
                          app2.saveDownload(song['song'],song['artist'],fileInfo['file']);
                        }else{
                          toast("There was an error while downloading a file");
                        }
                        print("downloaded file is");
                        print(fileInfo);
                      });
                    },
                  ),
                  VerticalIconicButton(
                    icon: Icons.favorite_border_outlined,
                    label: "Favourite",
                    iconColor: Colors.grey,
                    textColor: Colors.grey,
                    scale: 1.2,
                  ),
                  VerticalIconicButton(
                    icon: FontAwesomeIcons.readme,
                    label: "Lyrics",
                    iconColor: Colors.grey,
                    textColor: Colors.grey,
                    scale: 1.2,
                    onClicked: () {
                      goto(page: LyricsScreen.id, context: context, args: lyric);
                    },
                  ),
                ],
              ),
            ),

            // SONG PLAY PROGRESS INDICATOR
            VerticalSpacer(),
            MusicProgressIndicator(
              progress: currentDuration,
              buffered: Duration(milliseconds: 2000),
              total: Duration(milliseconds: 5000),
              showTotalRemainingTime: showRemaining,
              onSeek: (duration) {
                setState(() {
                  currentDuration = duration;
                  showRemaining = !showRemaining;
                });
                // _player.seek(duration);
              },
            ),

            // MUSIC PLAY CONTROLLER ACTION BUTTON

            VerticalSpacer(
              h: 20,
            ),

            Container(
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  IconicButton(
                    icon: Icons.repeat_one,
                    iconColor: Colors.grey,
                    transparent: true,
                    circledIcon: false,
                    size: 50,
                  ),
                  Container(
                    child: Row(
                      children: [
                        Container(
                          child: Center(
                            child: IconicButton(
                              icon: Icons.skip_previous_rounded,
                              iconColor: Colors.white,
                              transparent: true,
                              circledIcon: false,
                              size: 50,
                            ),
                          ),
                        ),
                        SizedBox(width: 15),
                        IconicButton(
                          icon: Icons.pause,
                          iconColor: Colors.grey,
                          iconCircleColor: Colors.blue,
                          size: 50,
                          onClicked: (){
                            toast("Playing file");
                            player.stop();
                            player.setUrl(songPath).then((play){
                              player.play();
                              print("Playing now");
                            });
                          },
                        ),
                        SizedBox(
                          width: 15,
                        ),
                        Container(
                          child: Center(
                            child: IconicButton(
                              icon: Icons.skip_next_rounded,
                              iconColor: Colors.white,
                              transparent: true,
                              circledIcon: false,
                              size: 50,
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                  IconicButton(
                    icon: Icons.queue_music_outlined,
                    iconColor: Colors.grey,
                    transparent: true,
                    circledIcon: false,
                    size: 50,
                    onClicked: () {
                      goto(page: AllSongsScreen.id, context: context);
                    },
                  ),
                ],
              ),
            ),

            // BOTTTOM SPACE
            VerticalSpacer(
              h: 30,
            ),
          ],
        ),
      ),
    );
  }

  void toast(String message){
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
      content:  Text(message.toString()),
      duration: const Duration(seconds: 1),
      action: SnackBarAction(
        label: 'OK',
        onPressed: () { },
      ),
    )
    );
  }
}

我用来播放声音的代码正在生成

烦人的声音，双重声音或波浪交叉
允许播放多种声音。

注意：我购买了模板。

谢谢，请帮忙。

Answer 1

您在控制器的addListener 中调用了setState() 方法，并在widget 构建中直接调用了player.stop() 和play()。在停止或播放方法之前检查播放器是否不为空且 isPlaying = false。而且你不应该在小部件构建中初始化你的播放器。不可取。

Answer 2

为了避免同时播放多个音频，也许您需要考虑将 AudioPlayer 设为 SINGLETON。上面的代码告诉我，每次你进入那个页面，都会有一个新的 AudioPlayer 创建关联，你没有在 dispose() 上处理它。这是我为我的 flutter 播客开源项目编写的一些代码。 a podcast case using just audio package

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