RoundedCorners roundedCorners = new RoundedCorners((int)DisplayUtil.dip2px(mContext, 6.0f));

//关键点
MultiTransformation multiTransformation = new MultiTransformation<>(new CenterCrop(), roundedCorners);

RequestOptions options = new RequestOptions()
        .diskCacheStrategy(DiskCacheStrategy.DATA)
        .bitmapTransform(multiTransformation);

Glide.with(mContext)
        .load(url)
        .apply(options)
        .into(ImageView);