Glide sets the 4 corners of the picture to be rounded

  //Glide设置图片圆角角度
    RoundedCorners roundedCorners = new RoundedCorners(50);
  //通过RequestOptions扩展功能,override:采样率,因为ImageView就这么大,可以压缩图片,降低内存消耗
   // RequestOptions options = RequestOptions.bitmapTransform(roundedCorners).override(20, 20);
       RequestOptions options = RequestOptions.bitmapTransform(roundedCorners);
   Glide.with(mContext).load(mUrlList.get(position % mUrlList.size())).apply(options).into(iv);