未处理的异常：PlatformException（AndroidAudioError，setDataSource失败。，java.io.IOException：setDataSource失败

Question

我是 Flutter 新手，目前正在通过在线教程学习 Flutter 基础知识。我目前正在构建一个简单的应用程序，当按下 TextButton 时，我们可以从我们的资源中播放音频。我已经使用了 audioplayers 库来实现同样的目的。

自上一天以来，我收到了这个可爱的错误，其中指出“E/flutter (14878): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(AndroidAudioError, setDataSource failed., java.io .IOException：setDataSource失败。”

我已尽力研究他的错误，但找不到任何东西。 这是我的 main.dart :

import 'package:flutter/material.dart';
import 'package:audioplayers/audioplayers.dart';
void main() {
  runApp(xylophone());
}


class xylophone extends StatefulWidget {
  const xylophone({super.key});

  @override
  State<xylophone> createState() => _xylophoneState();
}

class _xylophoneState extends State<xylophone> {

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(

        body: SafeArea(
            child: TextButton(
              onPressed: ()  {
                final player = AudioPlayer();
                player.play(
                    DeviceFileSource('assets/note1.wav'),
                );
              },
              child: Text('Click Me'),
            )
        ),
      ),
    );
  }
}

这是我的日志：

E/flutter (14878): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(AndroidAudioError, setDataSource failed., java.io.IOException: setDataSource failed.
E/flutter (14878):  at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1086)
E/flutter (14878):  at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1032)
E/flutter (14878):  at xyz.luan.audioplayers.source.UrlSource.setForMediaPlayer(UrlSource.kt:16)
E/flutter (14878):  at xyz.luan.audioplayers.player.MediaPlayerPlayer.setSource(MediaPlayerPlayer.kt:53)
E/flutter (14878):  at xyz.luan.audioplayers.player.WrappedPlayer.setSource(WrappedPlayer.kt:29)
E/flutter (14878):  at xyz.luan.audioplayers.AudioplayersPlugin.methodHandler(AudioplayersPlugin.kt:126)
E/flutter (14878):  at xyz.luan.audioplayers.AudioplayersPlugin.access$methodHandler(AudioplayersPlugin.kt:29)
E/flutter (14878):  at xyz.luan.audioplayers.AudioplayersPlugin$onAttachedToEngine$1$1.invoke(AudioplayersPlugin.kt:50)
E/flutter (14878):  at xyz.luan.audioplayers.AudioplayersPlugin$onAttachedToEngine$1$1.invoke(AudioplayersPlugin.kt:50)
E/flutter (14878):  at xyz.luan.audioplayers.AudioplayersPlugin$safeCall$1.invokeSuspend(AudioplayersPlugin.kt:75)
E/flutter (14878):  at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
E/flutter (14878):  at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
E/flutter (14878):  at kotlinx.coroutines.internal.LimitedDispatcher.run(LimitedDispatcher.kt:42)
E/flutter (14878):  at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:95)
E/flutter (14878):  at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:570)
E/flutter (14878):  at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
E/flutter (14878):  at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:677)
E/flutter (14878):  at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:664)
E/flutter (14878): , null)
E/flutter (14878): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:652:7)
E/flutter (14878): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:310:18)
E/flutter (14878): <asynchronous suspension>
E/flutter (14878): #2      AudioPlayer._completePrepared (package:audioplayers/src/audioplayer.dart:301:5)
E/flutter (14878): <asynchronous suspension>
E/flutter (14878): #3      AudioPlayer.setSourceDeviceFile (package:audioplayers/src/audioplayer.dart:325:5)
E/flutter (14878): <asynchronous suspension>
E/flutter (14878): #4      AudioPlayer.setSource (package:audioplayers/src/audioplayer.dart:284:5)
E/flutter (14878): <asynchronous suspension>
E/flutter (14878): #5      AudioPlayer.play (package:audioplayers/src/audioplayer.dart:182:5)
E/flutter (14878): <asynchronous suspension>
E/flutter (14878): 

我已将包正确包含在 pubspec.yaml 中

我尝试使用不同的库来播放音频文件，但每次都会遇到某种错误。我尝试过使用不同的库，例如生成随机文本，效果很好。

我正在学习 flutter 的在线教程。 我和教练做的一样，但出现错误。

Answer 1

在播放资源文件夹中的文件时，您必须将源添加为

AssetSource()

而不是

DeviceFileSource()

。

请参阅下面的代码片段并更新您的

onPressed()

代码。

onPressed: ()  
           {
                final player = AudioPlayer();
                player.play(
                    // DeviceFileSource('assets/note1.wav'), // remove this line
                    AssetSource('note1.wav'), // add this line
                );
           },

Answer 2

在处理 udemy 项目时遇到这个问题xylophone_flutter

我的flutter版本是3.16.9

flutter --version
Flutter 3.16.9 • channel stable • https://github.com/flutter/flutter.git

我的dart版本是3.2.6

  dart --version
Dart SDK version: 3.2.6 (stable) (Wed Jan 24 13:41:58 2024 +0000) on "macos_x64"

音频播放器依赖版本

audioplayers: ^5.2.1

下面是完整的工作代码。

import 'package:audioplayers/audioplayers.dart';
import 'package:flutter/material.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(XylophoneApp());
}

class XylophoneApp extends StatelessWidget {
  final player = AudioPlayer();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Xylophone')),
        body: SafeArea(
            child: Center(
          child: TextButton(
            onPressed: () {
              player.play(AssetSource('note2.wav'));
            },
            child: Text("Play"),
          ),
        )),
      ),
    );
  }
}

正如我们所见，

AssetSource

用于加载与应用程序捆绑在一起的音频。当您将音频存储在共享磁盘位置时，使用

DeviceSource

。

默认情况下，库只会查看 assets 文件夹。

因此请确保您的语音笔记仅位于资产文件夹中。并且它也注册在 pubspec.yaml 中

flutter:
  uses-material-design: true
  assets:
    - assets/