Flutter Audioplayers 无法加载资源

Question

我正在尝试使用 flutter 的音频播放器库播放简单的声音。当我尝试这样做时，我收到“无法加载资源”错误。我已经在这个网站上浏览了几个相关问题，所有这些问题似乎都只建议检查 pubspec.yaml 文件上的缩进并运行 flutter clean。我已经这样做了好几次了，但没有结果。 Flutter Doctor 没有发现任何问题。 当我单击应该播放声音的按钮时，我收到以下消息：

E/flutter (22727): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: Unable to load asset: assets/sounds/start.mp3
E/flutter (22727): #0      PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:221:7)
E/flutter (22727): <asynchronous suspension>
E/flutter (22727): #1      AudioCache._fetchAsset (package:audioplayers/audio_cache.dart:60:29)
E/flutter (22727): #2      AudioCache.fetchToMemory (package:audioplayers/audio_cache.dart:67:30)
E/flutter (22727): <asynchronous suspension>
E/flutter (22727): #3      AudioCache.load (package:audioplayers/audio_cache.dart:82:37)
E/flutter (22727): #4      AudioCache.getAbsoluteUrl (package:audioplayers/audio_cache.dart:140:23)
E/flutter (22727): #5      AudioCache.play (package:audioplayers/audio_cache.dart:103:24)
E/flutter (22727): #6      playSound (package:tick_tok_bio/player.dart:14:20)
E/flutter (22727): #7      MapsState.startNewRoute (package:tick_tok_bio/gps_tracking.dart:122:13)
E/flutter (22727): #8      MapsState.startStop.<anonymous closure> (package:tick_tok_bio/gps_tracking.dart:240:13)
E/flutter (22727): #9      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:779:19)
E/flutter (22727): #10     _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:862:36)
E/flutter (22727): #11     GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
E/flutter (22727): #12     TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:504:11)
E/flutter (22727): #13     BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:282:5)
E/flutter (22727): #14     BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:217:7)
E/flutter (22727): #15     PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:475:9)
E/flutter (22727): #16     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:76:12)
E/flutter (22727): #17     PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:122:9)
E/flutter (22727): #18     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:379:8)
E/flutter (22727): #19     PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:120:18)
E/flutter (22727): #20     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:106:7)
E/flutter (22727): #21     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:218:19)
E/flutter (22727): #22     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198:22)
E/flutter (22727): #23     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7)
E/flutter (22727): #24     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7)
E/flutter (22727): #25     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7)
E/flutter (22727): #26     _rootRunUnary (dart:async/zone.dart:1196:13)
E/flutter (22727): #27     _CustomZone.runUnary (dart:async/zone.dart:1085:19)
E/flutter (22727): #28     _CustomZone.runUnaryGuarded (dart:async/zone.dart:987:7)
E/flutter (22727): #29     _invoke1 (dart:ui/hooks.dart:275:10)
E/flutter (22727): #30     _dispatchPointerDataPacket (dart:ui/hooks.dart:184:5)

这是应该播放音频文件的代码：

import 'package:audioplayers/audio_cache.dart';
import 'dart:async';
import 'package:audioplayers/audioplayers.dart';

AudioPlayer advancedPlayer;
AudioCache audioCache;

void initPlayer() {
  advancedPlayer = AudioPlayer();
  audioCache = AudioCache(fixedPlayer: advancedPlayer, prefix: 'sounds/');
}

Future<void> playSound(String path) async {
  await audioCache.play(path);
  return;
}

这里是调用这些方法的地方：

void initState() {
    super.initState();
    initPlayer();
}

void startNewRoute() async {
    await playSound('start.mp3');
    // more code here
}

这是 

pubspec.yaml

的资产部分

flutter:
  uses-material-design: true

  assets:
    - images/
    - sounds/start.mp3

  fonts:
    - family: RobotoMono
      fonts:
        - asset: fonts/RobotoMono-Regular.ttf
        - asset: fonts/RobotoMono-Bold.ttf

文件的结构如下：

root
  lib
    [dart files]
  images
    [some images]
  sounds
    start.mp3

我找不到我在这里所做的事情与库文档解释它应该使用的方式之间的任何差异。感谢任何帮助，谢谢。

Answer 1

pubspec.yaml

，如下所示：

assets:
    - images/
    - assets/sounds/start.mp3

音频缓存

官方文档在这里

不要忘记将这些文件添加到您的 pubspec.yaml 文件中：

颤动：资产：

资产/爆炸.mp3

有人遇到类似问题

这里

Answer 2

您不能使用AudioCache()；与player.play('start.mp3');这是因为 AudioCache 类中没有定义“play”方法。

使用以下类：

final player = AudioPlayer();
player.play(AssetSource('start.mp3'));

但请确保您已将音轨的资源添加到 pubspec.yaml 文件中：

 assets:
   - assets/sounds/

或者如果第一个不起作用，请尝试这个

assets:
  - assets/sounds/start.mp3