Android: How to list mp3 albums

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I want to try develop simple android music player. I have this method below to list album title, but it gives duplicate albums list.

    public void getAlbumList() {
    //query external audio
    Activity a=getActivity();
    ContentResolver musicResolver = a.getContentResolver();
    Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    //String[] projection = null;

    //String sortOrder = null;

    String selectionMimeType = MediaStore.Files.FileColumns.MIME_TYPE + "=?";

    String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("mp3"); 

    String[] selectionArgsMp3 = new String[]{ mimeType };
    Cursor musicCursor = musicResolver.query(musicUri, null, selectionMimeType, selectionArgsMp3, null);
    //iterate over results if valid

    if(musicCursor!=null && musicCursor.moveToFirst()){
        //get columns
        int atitleColumn = musicCursor.getColumnIndex
                (android.provider.MediaStore.Audio.Media.ALBUM);
        int idColumn = musicCursor.getColumnIndex
                (android.provider.MediaStore.Audio.Media.ALBUM_ID);
        //int bitmap = musicCursor.getColumnIndex
            //  (android.provider.MediaStore.Audio.Albums.ALBUM_ART);
        //add songs to list
        while (musicCursor.moveToNext()){
            long thisId = musicCursor.getLong(idColumn);
            String thisaTitle = musicCursor.getString(atitleColumn);

            albumList.add(new Album(thisId, thisaTitle));
        } 

    }
}

I have tried this

but it doesn't work.

asked 35 secs ago

user2967801

10

Android: How to list mp3 albums