android 获取音乐文件的内置专辑图片

代码和注释如下：

private Cursor getCursor(String filePath) {  
      String path = null;  
      Cursor c = getContentResolver().query(  
              MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,  
              MediaStore.Audio.Media.DEFAULT_SORT_ORDER);  
      // System.out.println(c.getString(c.getColumnIndex("_data")));  
      if (c.moveToFirst()) {  
          do {  
              // 通过Cursor 获取路径，如果路径相同则break； 
           System.out.println("////////"+filePath);
              path = c.getString(c  
                      .getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)); 
             System.out.println("?????????"+path);
              // 查找到相同的路径则返回，此时cursorPosition 便是指向路径所指向的Cursor 便可以返回了  
              if (path.equals(filePath)) {  
                  // System.out.println("audioPath = " + path);  
                  // System.out.println("filePath = " + filePath);  
                 // cursorPosition = c.getPosition();
               break;
              }  
          } while (c.moveToNext());  
      }  
      // 这两个没有什么作用，调试的时候用  
      // String audioPath = c.getString(c  
      // .getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));  
      //  
      // System.out.println("audioPath = " + audioPath);  
      return c;  
  } 
 
     private String getAlbumArt(int album_id) {  
          String mUriAlbums = "content://media/external/audio/albums";  
          String[] projection = new String[] { "album_art" };  
          Cursor cur = this.getContentResolver().query(  
                  Uri.parse(mUriAlbums + "/" + Integer.toString(album_id)),  
                  projection, null, null, null);  
         String album_art = null;  
          if (cur.getCount() > 0 && cur.getColumnCount() > 0) {  
              cur.moveToNext();  
              album_art = cur.getString(0);  
          }  
          cur.close();  
          cur = null;  
          return album_art;  
      } 
     private void getImage(){
      Cursor currentCursor = getCursor("/mnt/sdcard/"+mp3Info);
   int album_id = currentCursor.getInt(currentCursor  
                  .getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM_ID)); 
      String albumArt = getAlbumArt(album_id);
      Bitmap bm = null;
      if (albumArt == null) {  
       mImageView.setBackgroundResource(R.drawable.staring);  
      } else {  
          bm = BitmapFactory.decodeFile(albumArt);  
          BitmapDrawable bmpDraw = new BitmapDrawable(bm);  
          mImageView.setImageDrawable(bmpDraw);  
      } 
     }