在选择中使用 where 条件，像这样.

use where condition in selection, like this.

final Cursor mCursor = getContentResolver()
    .query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.DATA }, MediaStore.Audio.Media.DATA
        + " LIKE '/storage/sdcard0/Music/MyFolder/%'", null, "LOWER("
        + MediaStore.Audio.Media.TITLE + ") ASC");