2018-01-13 view绘制流程-activity启动流程-window-decorView-ViewRootImpl关系
1.activity启动流程：
https://www.jianshu.com/p/927ca995bca6
http://blog.csdn.net/qian520ao/article/details/78156214
2.window和decorView关系梳理
https://www.jianshu.com/p/47eca41428d6
https://www.jianshu.com/p/c5386e8074e1
https://www.jianshu.com/p/ada6b5f18b5d
3.具体绘制流程：
http://mp.weixin.qq.com/s?__biz=MzA5MzI3NjE2MA==&mid=2650242156&idx=1&sn=e841a96007b7a0c58fc732d9c03dee6c&chksm=88638d03bf140415b4b341268c4c149254cd39b23324874f6f32fb0f2dcbaa09bcd43bc1a3ee&scene=0#rd