Android - 隐藏图片库活动中的专辑封面

Question

我已经制作了我的应用所需的图片库活动。一切顺利，除了它显示我的SD卡中包含专辑封面的每张音乐专辑的图像专辑。默认的图库应用程序设法隐藏这些相册图片。我怎样才能实现同样的目标？

我使用以下代码获取图像相册：

    Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
    String[] projection = { MediaStore.Images.Media._ID, MediaStore.Images.Media.BUCKET_ID,
            MediaStore.Images.Media.BUCKET_DISPLAY_NAME,MediaStore.Images.Media.DATA };
    Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
    ArrayList<String> ids = new ArrayList<String>();
    if (cursor != null) {
        while (cursor.moveToNext()) {
            PhotoAlbum album = new PhotoAlbum();
            int columnIndex = cursor.getColumnIndex(MediaStore.Images.Media.BUCKET_ID);
            album.id = cursor.getString(columnIndex);

            if (!ids.contains(album.id)) {
                //get album name
                columnIndex = cursor.getColumnIndex(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
                album.name = cursor.getString(columnIndex);
                //get image id for the album cover
                columnIndex = cursor.getColumnIndex(MediaStore.Images.Media._ID);
                album.coverID = cursor.getInt(columnIndex);
                //get filename of album cover image
                columnIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA);
                album.fileName=new File(cursor.getString(columnIndex)).getParentFile().getAbsolutePath(); 
                album.count++;     albumList.add(album);      ids.add(album.id);    album.bm=null;


            } else { albumList.get(ids.indexOf(album.id)).count++; }
        }
        cursor.close();
    }