Google于前几天发布了AndroidP的DP5， 随着DP5的发布，API28的文档算是定型了，这里来探讨下AndroidP的刘海适配方法

随着越来越多的设备开始使用刘海屏，这里给出一部分刘海屏的适配方法

做一些总结，今天大致看了下GCM的使用方法，现在来稍微总结一下，作为一个温习。

Activities in the system are managed as an activity stack. When a new activity is started, it is placed on the top of the stack and becomes the running activity – the previous activity always remains below it in the stack, and will not come to the foreground again until the new activity exits.

####使用Android5.1 + Chrome效果图