参考：

http://www.jianshu.com/p/7610bdbbad17

https://github.com/bumptech/glide

https://futurestud.io/tutorials/glide-getting-started

https://mrfu.me/2016/02/28/Glide_Customize_Glide_with_Modules/

http://www.licheedev.com/2015/09/19/custom-glide-modelloader/

http://www.jianshu.com/p/31c82862ef19

1.自定义ModelLoader

---

classMyFileLoaderextendsStreamFileLoader {

@Override

publicDataFetcher getResourceFetcher(File model,intwidth,intheight) {

//在此做自定义格式转换

//TODO: 注意此处是主线程运行，不能做耗时操作

return super.getResourceFetcher(model, width, height);

}

publicMyFileLoader(Context context) {

super(context);

}

publicMyFileLoader(ModelLoader uriLoader) {

super(uriLoader);

}

}

2. 使用自定义ModelLoader

---

String path2 = Environment.getExternalStorageDirectory() + File.separator+"/2.webp";

Glide.with(context)

.using(newMyFileLoader(this))

.load(newFile(path2))//可以直接从file或者Uri加载

// .load("http://www1.zj.com/member/news_pic/2010-01-29/20100129141608426.jpg")

.placeholder(R.drawable.ic_launcher)//占位图（下载缓慢时显示）

.error(R.drawable.ic_launcher)//出错时要显示的图片

.crossFade()//淡入淡出的效果

.into(imageView1);