Question

我正在使用audioplayers包向我的应用添加声音，但在开始构建时没有声音播放。在重新启动面团时，在加载文件后出现以下异常：

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):

我确实将文件放在了包含我用于图标的所有图像的同一资源文件夹中，因此pubspec.yaml文件中的缩进是正确的。问题不应该是文件命名，无论是我使用驼峰式大小写还是单个单词命名（从使用空空格命名的图像中汲取的教训..）。值得一提的是，如果我将文件拖放到assets文件夹中，则会出现错误。我尝试删除该文件夹，然后重新创建它，然后进行拖放操作，但是第二次添加仅一次..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，则可能会在 just_audio 中发生这种情况。

flutter:
  assets:
    - audio/

这告诉 Flutter 在项目的根目录中有一个 audio 文件夹，用于保存音频资源。

这样做之后，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，也会发生该错误，但我假设您已经检查过了。

Answer 2

请尝试更改此内容资产/click.mp3 至 click.mp3

我也忽略了路径中的“ assets /”，使它无缝播放本地声音，这同样导致我出错。音频播放器假定其默认路径为asset /

无法加载资产：加载.mp3文件时出错

2 个答案: