@Override
    public View getView(int position, View convertView, ViewGroup viewGroup) {

        ImageView picturesView;
        if (convertView == null) {
            picturesView = new ImageView(context);
            if (list.get(position).toString().contains(".jpg")) {
                bitmap = BitmapFactory.decodeFile(list.get(position).toString()); //Creation of Thumbnail of image
            } else {
                if (list.get(position).toString().contains(".mp4")) {
                    bitmap = ThumbnailUtils.createVideoThumbnail(list.get(position).toString(), 1); //Creation of Thumbnail of video
                }
            }
            picturesView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            //picturesView.setPadding(8, 8, 8, 8);
            picturesView.setLayoutParams(new GridView.LayoutParams(200, 200));
        } else {
            picturesView = (ImageView) convertView;
        }
        picturesView.setImageBitmap(bitmap);
        return picturesView;
    }