Android媒体播放器与PVMFErrNotSupported的MP3失败？

Question

我有一个下载的MP3，我可以验证为MP3通过adb拉到我的mac或pc，并在其各自的媒体播放器中播放。但是，Android的错误意味着它不支持该格式。我认为它可能与我存储文件的目录位置有关，但这没有意义（/data/data/com.myapp/files/file_audio.mp3）。这是一个的AsyncTask里面的代码：

protected String doInBackground(String... params) { 

     String filename = params[0]; 

     try { 
      StringBuilder filenameMp3 = new StringBuilder().append(context.getFilesDir()); 
      filenameMp3.append("/").append(filename); 

      Uri uriMp3 = Uri.parse(filenameMp3.toString()); 
      Log.d(TAG, "Listen to this ringtone! [" + uriMp3.toString() + "]"); 

      MediaPlayer mp = MediaPlayer.create(context, uriMp3); 
      mp.prepare(); 
      mp.start(); 
     } catch (IllegalStateException e) { 
      Log.e(TAG, e.toString()); 
      e.printStackTrace(); 
     } catch (IOException e) { 
      Log.e(TAG, e.toString()); 
      e.printStackTrace(); 
     } 

     return null; 
    } 

这里是日志：

09-07 23:16:09.617 E/MediaPlayerService(1128): The Default Player is PV_PLAYER*********************** 
09-07 23:16:09.617 V/PVPlayer(1128): PVPlayer constructor 
09-07 23:16:09.617 V/PVPlayer(1128): construct PlayerDriver 
09-07 23:16:09.617 V/PlayerDriver(1128): constructor 
09-07 23:16:09.627 V/PlayerDriver(1128): OpenCore hardware module loaded 
09-07 23:16:09.627 V/PlayerDriver(1128): start player thread 
09-07 23:16:09.627 V/PlayerDriver(1128): startPlayerThread 
09-07 23:16:09.627 V/PlayerDriver(1128): InitializeForThread 
09-07 23:16:09.627 V/PlayerDriver(1128): OMX_MasterInit 
09-07 23:16:09.647 V/PlayerDriver(1128): OsclScheduler::Init 
09-07 23:16:09.647 V/PlayerDriver(1128): CreatePlayer 
09-07 23:16:09.657 V/PlayerDriver(1128): AddToScheduler 
09-07 23:16:09.657 V/PlayerDriver(1128): PendForExec 
09-07 23:16:09.657 V/PlayerDriver(1128): OsclActiveScheduler::Current 
09-07 23:16:09.657 V/PlayerDriver(1128): StartScheduler 
09-07 23:16:09.657 V/PVPlayer(1128): send PLAYER_SETUP 
09-07 23:16:09.667 V/PlayerDriver(1128): Send player code: 2 
09-07 23:16:09.667 V/PlayerDriver(1128): CommandCompleted 
09-07 23:16:09.667 V/PlayerDriver(1128): Completed command PLAYER_SETUP status=PVMFSuccess 
09-07 23:16:09.667 V/PVPlayer(1128): setDataSource(/data/data/com.myapp/files/audio.mp3) 
09-07 23:16:09.667 V/PVPlayer(1128): prepareAsync 
09-07 23:16:09.667 V/PVPlayer(1128): data source = /data/data/com.myapp/files/audio.mp3 
09-07 23:16:09.667 V/PlayerDriver(1128): Send player code: 3 
09-07 23:16:09.667 V/PlayerDriver(1128): handleSetDataSource 
09-07 23:16:09.667 V/PlayerDriver(1128): handleSetDataSource- scanning for extension 
09-07 23:16:09.667 V/PlayerDriver(1128): HandleInformationalEvent: PVMFInfoErrorHandlingStart 
09-07 23:16:09.667 V/PlayerDriver(1128): HandleInformationalEvent: type=26 UNHANDLED 
09-07 23:16:09.667 W/MediaPlayer(14630): info/warning (1, 26) 
09-07 23:16:09.667 I/MediaPlayer(14630): Info (1,26) 
09-07 23:16:09.667 V/PlayerDriver(1128): CommandCompleted 
09-07 23:16:09.667 V/PlayerDriver(1128): Completed command PLAYER_SET_DATA_SOURCE status=PVMFErrNotSupported 
09-07 23:16:09.667 E/PlayerDriver(1128): Command PLAYER_SET_DATA_SOURCE completed with an error or info PVMFErrNotSupported 
09-07 23:16:09.667 E/MediaPlayer(14630): error (1, -4) 
09-07 23:16:09.677 V/PVPlayer(1128): run_init s=-2147483648, cancelled=0 
09-07 23:16:09.677 V/PlayerDriver(1128): HandleInformationalEvent: PVMFInfoErrorHandlingComplete 
09-07 23:16:09.677 W/PlayerDriver(1128): PVMFInfoErrorHandlingComplete 

任何线索？

Answer 1

FileInputStream fis = getBaseContext().openFileInput(filename.toString()); 
mp = new MediaPlayer(); 
mp.setOnCompletionListener(onCompleteAudioListener); 
mp.setDataSource(fis.getFD()); 
mp.prepare(); 
mp.start(); 

加上正常的检查和错误处理。

Answer 2

这将是很好的选择您要播放的文件是否存在，并且其长度大于0，以确保公正的路径是正确的：

File file = new File("/data/...../....mp3"); 

boolean exists = file.exists(); 

long length = file.length(); 

另外，还要确保你的URI与file://开始

Answer 3

好的 - 我得到它的工作，但不是因为我希望我能实施。首先，我必须在系统媒体文件夹中存储：

File file = new File("/system/media/audio/ringtones/", filename); 

其次，我不得不停下来准备启动媒体播放器。我尝试了基于网络上其他帖子的其他帖子。

  if (exists && length > 0) { 
       mp = MediaPlayer.create(context, uriMp3); 
       mp.stop(); 
       mp.prepare(); 
       mp.start(); 
      } else { 
       if (exists) { 
        return String.format("Ringtone has length %d.", length); 
       } else { 
        return String.format("Ringtone %s is missing.", uriMp3.toString()); 
       } 
      }