如何在 Flutter 中播放自定义声音?

How to play a custom sound in Flutter?

我可以用这行代码播放简单的声音:

SystemSound.play(SystemSoundType.click);

如何播放自定义声音?

让我们说一个简短的 mp3

感谢您查看 Flutter!

目前(截至 2017 年 5 月 5 日)的 Flutter SDK 没有内置支持播放和控制任意音频。然而,我们设计了我们的插件系统来支持它。

此插件为 Flutter 添加了音频支持:https://pub.dartlang.org/packages/audioplayer

来自插件的自述文件:

Future play() async {
  final result = await audioPlayer.play(kUrl);
  if (result == 1) setState(() => playerState = PlayerState.playing);
}

// add a isLocal parameter to play a local file
Future playLocal() async {
  final result = await audioPlayer.play(kUrl);
  if (result == 1) setState(() => playerState = PlayerState.playing);
}


Future pause() async {
  final result = await audioPlayer.pause();
  if (result == 1) setState(() => playerState = PlayerState.paused);
}

Future stop() async {
  final result = await audioPlayer.stop();
  if (result == 1) {
    setState(() {
      playerState = PlayerState.stopped;
      position = new Duration();
    });
  }
}

播放已在资产中定义的文件的简单解决方案是使用 AudioCache。 图书馆:https://pub.dartlang.org/packages/audioplayersMore about AudioCache 将库添加到 pubspec.yaml 后,需要导入 class:

import 'package:audioplayers/audio_cache.dart';

在同一个文件中添加一个资产,并将带有声音的文件放入资产文件夹(如果没有此文件夹,请创建它)

assets:
- assets/sound_alarm.mp3

然后添加此代码:

static AudioCache player = new AudioCache();
const alarmAudioPath = "sound_alarm.mp3";
player.play(alarmAudioPath);

一个例子here

[答案已更新:此方法无效,请参阅评论] 您可以使用 Flutter 团队维护的 video_player 插件。它可以跨平台复制多种媒体,包括声音文件。更具体地说,您可能想要使用 VideoPlayerController class.

例如。

   _controller = VideoPlayerController.network('<a href="https://www.example.com/soundsFile.wav" rel="nofollow noreferrer">https://www.example.com/soundsFile.wav</a>');
   _controller.play();
</pre>

音频播放器有效(来自 https://medium.com/@bennett4/adding-custom-sound-effects-to-a-flutter-mobile-app-41594f1f3305):

(1) 将库添加到您的 pubspec.yaml:audioplayers: ^0.15.1

(2) 在 flutter 下的 pubspec.yaml 中添加对资产文件的引用:

flutter
    assets:
       - assets/yes.mp3

确保它在资产文件夹下。它在子文件夹中时不起作用。例如,类似:- assets/sounds/yes.mp3 将不起作用。只需将您的音频文件放在 assets 文件夹中,而不是其子文件夹中

(3) 在您的应用中将库导入为:import package:audioplayers/audioplayers.dart;

(4) 然后定义这个函数:

Future<AudioPlayer> playLocalAsset() async {
    AudioCache cache = new AudioCache();
   //At the next line, DO NOT pass the entire reference such as assets/yes.mp3. This will not work.
   //Just pass the file name only.
    return await cache.play("yes.mp3"); 
}

(5) 每当需要播放声音时调用函数:await playLocalAsset();

空安全代码:

  1. 将依赖项添加到您的 pubspec.yaml 文件,

    dependencies:
      audioplayers: ^0.19.0
    
  2. 将音频文件路径添加到您的 pubspec.yaml 文件。

    flutter: 
      assets:
        - assets/audio/my_audio.mp3
    
  3. 运行 flutter pub get

完整代码:

class HomePage extends StatelessWidget {
  final AudioCache _audioCache = AudioCache(
    prefix: 'audio/',
    fixedPlayer: AudioPlayer()..setReleaseMode(ReleaseMode.STOP),
  );
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ElevatedButton(
        onPressed: () => _audioCache.play('my_audio.mp3'),
        child: Text('Play Audio'),
      ),
    );
  }
}