https://blog.csdn.net/u013052238/article/details/81436291
https://blog.csdn.net/zhanghanboke/article/details/82776374
https://segmentfault.com/q/1010000015114327
getUpdateManager
https://www.cnblogs.com/biangz/p/9047538.html
https://blog.csdn.net/u013052238/article/details/81436291
https://blog.csdn.net/zhanghanboke/article/details/82776374
https://segmentfault.com/q/1010000015114327
getUpdateManager
https://www.cnblogs.com/biangz/p/9047538.html