我正在尝试编写一个插件,用于播放存储在Flutter包的资产文件夹中的音频文件,已经进行了以下操作:
if(call.method.equals("playMusic"))
{
Log.d(TAG, "onMethodCall: play music function called");
String fileLocation = call.argument("file");
Log.d(TAG, "onMethodCall: file requested is "+fileLocation);
AssetManager assetManager = registrar.context().getAssets();
String key = registrar.lookupKeyForAsset(fileLocation);
Log.d(TAG, "onMethodCall: key is "+key);
AssetFileDescriptor fd;
MediaPlayer mediaPlayer = new MediaPlayer();
try {
Log.d(TAG, "onMethodCall: found assets " + Arrays.toString(assetManager.list("assets/")));
fd= assetManager.openFd(key);
mediaPlayer.setDataSource(fd.getFileDescriptor(),fd.getStartOffset(),fd.getLength());
fd.close();
mediaPlayer.prepare();
mediaPlayer.start();
result.success("played successfully");
}
catch (Exception e){
Log.d(TAG, "onMethodCall: exception occured "+e.toString());
result.success("playing failed");
}
}
文件位置被正确地传递为
assets/river.m4a
我已经检查并发现,注册机所查找的关键字是
flutter_assets/assets/river.m4a
该文件位于包内的位置为
assets/flutter_assets/assets/river.m4a
但是当我运行应用程序时,仍然会抛出以下异常:
D/TunePlugin: onMethodCall: exception occured java.io.FileNotFoundException: flutter_assets/assets/river.m4a