AppUserClass
ImageLoader
CrontabParser
+ parse
CrontabEntry
AdvertismentManager
+ init+ scheduleUpdate+ loadText+ loadImage+ loadDownloadedImage+ getItems+ getItem- getAdvertismentDataVersion- saveAdvertismentData
AdvertismentItem
依赖库
AdvertismentUpdateTask
+ scheduleUpdate- shouldUpdate- update
AdvertismentConfig
+ getDefaultUpdateInterval+ getDefaultItems+ getPreDownloadImageGuids
pinguonetworklib
AppAdvertismentConfig
使用app
广告sdk
AdvertisementImageDownloader
+ download+ generateDownloadPath
