一个FragmentActivity多个Fragment的生命周期事件记录

• 初次打开FragmentActivity时

   VisitTaskManagerActivity(): onCreate
   VisitTaskManagerActivity(): onStart
   VisitTaskManagerActivity(): onResume
  
   Fragment1(): onAttach
   Fragment1(): onCreate
   Fragment1(): onCreateView
   Fragment1(): onViewCreated
   Fragment1(): onActivityCreated
   Fragment1(): onViewStateRestored
   Fragment1(): onStart
   Fragment1(): onResume
  
   Fragment2(): onAttach
   Fragment2(): onCreate
   Fragment2(): onCreateView
   Fragment2(): onViewCreated
   Fragment2(): onActivityCreated
   Fragment2(): onViewStateRestored
  
   Fragment3(): onAttach
   Fragment3(): onCreate
   Fragment3(): onCreateView
   Fragment3(): onViewCreated
   Fragment3(): onActivityCreated
   Fragment3(): onViewStateRestored
  
   Fragment4(): onAttach
   Fragment4(): onCreate
   Fragment4(): onCreateView
   Fragment4(): onViewCreated
   Fragment4(): onActivityCreated
   Fragment4(): onViewStateRestored
  
   Fragment2(): onStart
   Fragment2(): onResume
  
   Fragment3(): onStart
   Fragment3(): onResume
  
   Fragment4(): onStart
   Fragment4(): onResume

• 系统按HOME键到桌面时

  VisitTaskManagerActivity(): onPause
  Fragment1(): onPause
  Fragment2(): onPause
  Fragment3(): onPause
  Fragment4(): onPause
  VisitTaskManagerActivity(): onStop
  Fragment1(): onStop
  Fragment2(): onStop
  Fragment3(): onStop
  Fragment4(): onStop

• 从桌面返回FragmentActivity时

   VisitTaskManagerActivity(): onStart
   Fragment1(): onStart
   Fragment2(): onStart
   Fragment3(): onStart
   Fragment4(): onStart
   VisitTaskManagerActivity(): onResume
   Fragment1(): onResume
   Fragment2(): onResume
   Fragment3(): onResume
   Fragment4(): onResume

• 自动切换横竖屏时（或者按HOME键到桌面时，杀掉进程，再从桌面返回FragmentActivity时）

  VisitTaskManagerActivity(): onCreate
  
  Fragment1(): onAttach
  Fragment1(): onCreate
  
  Fragment2(): onAttach
  Fragment2(): onCreate
  
  Fragment3(): onAttach
  Fragment3(): onCreate
  
  Fragment4(): onAttach
  Fragment4(): onCreate
  
  VisitTaskManagerActivity(): onStart
  
  Fragment1(): onCreateView
  Fragment1(): onViewCreated
  Fragment1(): onActivityCreated
  Fragment1(): onViewStateRestored
  
  Fragment2(): onCreateView
  Fragment2(): onViewCreated
  Fragment2(): onActivityCreated
  Fragment2(): onViewStateRestored
  
  Fragment3(): onCreateView
  Fragment3(): onViewCreated
  Fragment3(): onActivityCreated
  Fragment3(): onViewStateRestored
  
  Fragment4(): onCreateView
  Fragment4(): onViewCreated
  Fragment4(): onActivityCreated
  Fragment4(): onViewStateRestored
  
  Fragment1(): onStart
  Fragment2(): onStart
  Fragment3(): onStart
  Fragment4(): onStart
  
  VisitTaskManagerActivity(): onResume
  Fragment1(): onResume
  Fragment2(): onResume
  Fragment3(): onResume
  Fragment4(): onResume

在此使用onSaveInstanceState来保存临时状态的需留意的：

1. 根据官方文档的说明，onSaveInstanceState的调用时机为非正常finish()情况下，可能在onPause到onDestroy之间的任意时刻调用。
   onSaveInstanceState | Android Developers