base on LruCache DiskLruCache
refer to https://github.com/fhucho/simple-disk-cache https://github.com/JakeWharton/DiskLruCache
先从LruCache中读取，获取不成功，则从DiskLruCache中获取
wangdaliu/SnailPhotoCache
Folders and files
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