Android获取内存卡MP3信息

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public List<Map<String, Object>> getMusic(Context context){        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();        Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);        //遍历媒体数据库        if(cursor.moveToFirst()){            int i=1;            while (!cursor.isAfterLast()) {                //歌曲编号                int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID));                //歌曲标题                String title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));                //歌曲的专辑名：MediaStore.Audio.Media.ALBUM                String album = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM));                //歌曲的歌手名： MediaStore.Audio.Media.ARTIST                String artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));                //歌曲文件的路径 ：MediaStore.Audio.Media.DATA                String url = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));                //歌曲的总播放时长 ：MediaStore.Audio.Media.DURATION                int duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));                //歌曲文件的大小 ：MediaStore.Audio.Media.SIZE                Long size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE));                if(size>1024*800){//大于800K                    HashMap<String, Object> map = new HashMap<String, Object>();                    map.put("musicId", i);                    map.put("musicTitle", title);                    map.put("musicFileUrl", url);                    map.put("music_file_name", title);                    list.add(map);                }                i++;                cursor.moveToNext();            }        }        return list;    }
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