如何播放列表中的歌曲。我能够获得歌曲，但我无法播放任何内容

Question

以下是我的代码，用于从设备获取歌曲。但我无法播放任何内容。

try { 
    Cursor cursor = getContentResolver().query(
    MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, null); 

    if (cursor == null) { 
     // Query failed... 
    } else if (!cursor.moveToFirst()) { 
    // Nothing to query. There is no music on the device. 
    }else { 
    // add each song to mItems. 

    //these is the part that gets each item from the cursor and adds them to the list. 

    do { 
      int artistColumn = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST); 
      // add each song to mItems. 
     int titleColumn = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE); 
      // add each song to mItems. 
      int albumColumn = cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM); 
      // add each song to mItems. 
      int albumArt = cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID); 
      // add each song to mItems. 
      int durationColumn = cursor.getColumnIndex(MediaStore.Audio.Media.DURATION); 
      // add each song to mItems. 
      int idColumn = cursor.getColumnIndex(MediaStore.Audio.Media._ID); 
      // add each song to mItems. 
      int filePathIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 

      int art = cursor.getColumnIndex(MediaStore.Audio.AlbumColumns.ALBUM_ART); 

      // these section adds the media info(MediaInfo.class) to the mediaList. 
      MediaFileInfo audio = new MediaFileInfo(); 
      audio.setFileName(cursor.getString(titleColumn)); 
      audio.setFilePath(cursor.getString(filePathIndex)); 
      audio.setImgId(cursor.getInt(albumArt)); 
      audio.setFileType(type); 
      audio.setImgId(cursor.getInt(art)); 

      //am adding all the items to the list(medaiList). 

      mediaList.add(audio); 
    } while (cursor.moveToNext()); 
    } 
} catch (Exception e) { 
    e.printStackTrace(); 
} 

Answer 1

我认为你必须设置你的光标路径的数据源是指你的歌path.And如果使用的是内容提供商，URI查询，MediaStore.Audio.Media.EXTERNAL_CONTENT_URI。

然后，您必须在您的歌曲路径光标中设置返回的光标。与此类似，

String path = cursor.getString(getColumnIndex(Audio.Media.DATA)); 
MediaPlayer mp = new MediaPlayer(); 
mp.setDataSource(path); 
mp.prepare(); 
mp.start(); 

它会帮助你...