无法加载资源：加载 .mp3 文件时出错

Question

我使用该包向我的应用程序添加声音audioplayers，但最初构建时没有播放声音。加载文件时热重启面团后，我收到此异常：

E/flutter (32175): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: Unable to load asset: assets/assets/click.mp3
E/flutter (32175): #0      PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:221:7)
E/flutter (32175): <asynchronous suspension>
E/flutter (32175): #1      AudioCache._fetchAsset (package:audioplayers/audio_cache.dart:60:29)
E/flutter (32175): #2      AudioCache.fetchToMemory (package:audioplayers/audio_cache.dart:67:30)
E/flutter (32175): <asynchronous suspension>
E/flutter (32175): #3      AudioCache.load (package:audioplayers/audio_cache.dart:82:37)
E/flutter (32175): #4      AudioCache.getAbsoluteUrl (package:audioplayers/audio_cache.dart:140:23)
E/flutter (32175): #5      AudioCache.play (package:audioplayers/audio_cache.dart:103:24)
E/flutter (32175): #6      _MapScreenState.build.<anonymous closure> (package:fixit_cloud_biking/Screens/map_screen.dart:1239:46)
E/flutter (32175): #7      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:706:14)
E/flutter (32175): #8      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:789:36)
E/flutter (32175): #9      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
E/flutter (32175): #10     TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:486:11)
E/flutter (32175): #11     BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:264:5)
E/flutter (32175): #12     BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:199:7)
E/flutter (32175): #13     PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:467:9)
E/flutter (32175): #14     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:76:12)
E/flutter (32175): #15     PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:117:9)
E/flutter (32175): #16     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:379:8)
E/flutter (32175): #17     PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:115:18)
E/flutter (32175): #18     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:7)
E/flutter (32175): #19     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:218:19)
E/flutter (32175): #20     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198:22)
E/flutter (32175): #21     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7)
E/flutter (32175): #22     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7)
E/flutter (32175): #23     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7)
E/flutter (32175): #24     _rootRunUnary (dart:async/zone.dart:1138:13)
E/flutter (32175): #25     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
E/flutter (32175): #26     _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
E/flutter (32175): #27     _invoke1 (dart:ui/hooks.dart:273:10)
E/flutter (32175): #28     _dispatchPointerDataPacket (dart:ui/hooks.dart:182:5)
E/flutter (32175): 

我确实将文件放在同一资产文件夹中，其中包含我用于图标的所有图像，因此pubspec.yaml文件中的缩进是正确的。问题不应该是文件命名，因为我使用驼峰命名或单个单词命名（从带有空格的图像命名中学到的教训..）。值得一提的是，如果我将文件拖放到文件assets夹中，则会出现错误。我尝试删除该文件夹，重新创建它，然后拖放工作，但只有一次......在第二时刻添加的文件会引发错误。这是应该播放声音的按钮：

IconButton(
                        icon: Image.asset('assets/centerMapButton.png'),
                        iconSize: 60,
                        onPressed: () async {
                          await widget.cache.play('assets/click.mp3',
                              volume: 50, mode: PlayerMode.MEDIA_PLAYER);
                          print('Center map button pressed');
                          _mapController.move(userLocation, 16);
                        }),

并且AudioCache()被声明为AudioCache cache = new AudioCache();。

Answer 1

如果您未在pubspec.yaml中设置资产位置，则just_audio中可能会发生这种情况。

flutter:
  assets:
    - audio/

这告诉 Flutter 您的项目根目录中有一个音频文件夹，用于保存音频资源。

完成此操作后，您应该能够设置资产并像这样播放它：

await player.setAsset('audio/cow.mp3');
player.play();

如果您在路径中拼写错误，也可能会发生该错误，但我假设您已经检查过这一点。

Answer 2

尝试将此 asset/click.mp3 更改为 click.mp3

我遇到了同样的错误，忽略了路径中的“assets/”，使其无缝地播放本地声音。Audioplayers 假设它的默认路径是 asset/