https://www.jianshu.com/p/75938bddf407//详细的博客
//Glide的缓存
masterPic = list.get(i).getMasterPic();
requestOptions = new RequestOptions();
requestOptions.error(R.drawable.cuowu);
requestOptions.override(380,380);
//磁盘缓存(比较重要10分 glide 的重要的属性)
requestOptions.diskCacheStrategy(DiskCacheStrategy.ALL);
//更新时候的占位符
requestOptions.placeholder(R.drawable.zhanwei);
Glide.with(context)
.load(masterPic)
.apply(requestOptions)
.into(myViewHolder.img_shop);