主要看两张图，和跑代码

一，Fragment的生命周 

二，与Activity生命周期的对比

场景演示 : 切换到该Fragment

11-29 14:26:35.095: D/AppListFragment(7649): onAttach
11-29 14:26:35.095: D/AppListFragment(7649): onCreate
11-29 14:26:35.095: D/AppListFragment(7649): onCreateView
11-29 14:26:35.100: D/AppListFragment(7649): onActivityCreated
11-29 14:26:35.120: D/AppListFragment(7649): onStart
11-29 14:26:35.120: D/AppListFragment(7649): onResume

屏幕灭掉：

11-29 14:27:35.185: D/AppListFragment(7649): onPause
11-29 14:27:35.205: D/AppListFragment(7649): onSaveInstanceState
11-29 14:27:35.205: D/AppListFragment(7649): onStop

屏幕解锁

11-29 14:33:13.240: D/AppListFragment(7649): onStart
11-29 14:33:13.275: D/AppListFragment(7649): onResume

切换到其他Fragment:
11-29 14:33:33.655: D/AppListFragment(7649): onPause
11-29 14:33:33.655: D/AppListFragment(7649): onStop
11-29 14:33:33.660: D/AppListFragment(7649): onDestroyView

切换回本身的Fragment:

11-29 14:33:55.820: D/AppListFragment(7649): onCreateView
11-29 14:33:55.825: D/AppListFragment(7649): onActivityCreated
11-29 14:33:55.825: D/AppListFragment(7649): onStart
11-29 14:33:55.825: D/AppListFragment(7649): onResume

回到桌面

11-29 14:34:26.590: D/AppListFragment(7649): onPause
11-29 14:34:26.880: D/AppListFragment(7649): onSaveInstanceState
11-29 14:34:26.880: D/AppListFragment(7649): onStop

回到应用

11-29 14:36:51.940: D/AppListFragment(7649): onStart
11-29 14:36:51.940: D/AppListFragment(7649): onResume

退出应用

11-29 14:37:03.020: D/AppListFragment(7649): onPause
11-29 14:37:03.155: D/AppListFragment(7649): onStop
11-29 14:37:03.155: D/AppListFragment(7649): onDestroyView
11-29 14:37:03.165: D/AppListFragment(7649): onDestroy
11-29 14:37:03.165: D/AppListFragment(7649): onDetach

比Activity多了一些生命周期，完整和Activity对接上，大家好好利用。

以上文字摘自：http://blog.csdn.net/forever_crying/article/details/8238863