android获取音乐文件的内置专辑图片实现思路及代码

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); 
} 
}