解析fragment
一、Fragment的生命周期
二、fragment生命周期场景演示
1.从别处切换到该fragment:onAttach->onCreate->onCreateView->onActivityCreated->onStart->onResume
2.屏幕熄灭: onPause->onSaveInstanceState->onStop
3.屏幕解锁: onStart->onResume
4.从该fragment切换到其他fragment: onPause->onStop->onDestroyView
5.从别的fragment切回到本身的fragment:onCreateView->onActivityCreated->onStart->onResume
6.回到桌面:onPause->onSaveInstanceState->onStop
7.回到应用:onStart->onResume
8.推出应用:onPause->onStop->onDestroyView->onDestroy->onDetach