AActivity启动BActivity旋转的生命周期变化
这个的AActivity由MainActivity代替
AActivity -> BActivity 的生命周期过程
MainActivity: onPause
BActivity: ----> onCreate
BActivity: ----> onStart
BActivity: ----> onResume
MainActivity: onStop
MainActivity: onSaveInstanceState
BActivity启动后的情况下，反转手机屏幕
BActivity: onPause
BActivity: onStop
BActivity: onSaveInstanceState
BActivity: onDestroy
BActivity: onCreate
BActivity: onStart
BActivity: onRestoreInstanceState
BActivity: onResume
此时如果息屏了，然后手机又会变成竖屏
BActivity: onPause
BActivity: onStop
BActivity: onSaveInstanceState
BActivity: onDestroy
BActivity: onCreate
BActivity: onStart
BActivity: onRestoreInstanceState
BActivity: onResume
BActivity: onPause
BActivity: onStop
BActivity: onSaveInstanceState
这个时候注意：如果BActivity现在还是横屏的状态，按了返回键之后 ， MainActivity的生命周期变化情况如下：
BActivity: ----> onPause
MainActivity: onDestroy
MainActivity: onCreate
MainActivity: onStart
MainActivity: onRestoreInstanceState
MainActivity: onResume
BActivity: ----> onStop
BActivity: ----> onDestroy
但是如果当旋转BActivity（横屏）之后，然后再把BActivity旋转回来（竖屏），在按返回键退出BActivity，然后MainActivity此时会是一个正常的生命周期
BActivity: ----> onPause
MainActivity: onRestart
MainActivity: onStart
MainActivity: onResume
BActivity: ----> onStop
BActivity: ----> onDestroy
配置android:configChanges
//配置了这个之后，就旋转屏幕就不会走生命周期了
//不重新重建Activity
//https://www.jianshu.com/p/4d3441757ab4
android:configChanges="keyboardHidden|orientation|screenSize"
//屏幕息屏到开屏的时候
MainActivity: onRestart
MainActivity: onStart
MainActivity: onResume
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