Fragment的生命周期

时间 2019-11-18

标签 fragment 生命周期繁體版

原文原文链接

Fragment必须老是被嵌入到一个activity中。它们的生命周期直接受其宿主activity的生命周期影响。例如：当activity被暂停，那么在其中的全部fragment也被暂停；当activity被销毁，全部隶属于它的fragment也被销毁。然而，当一个activity正在运行时(处于resumed状态)，咱们能够独立地操做每个fragment，好比添加或删除它们。当处理这样一种fragment事务时，能够将它添加到activity所管理的back stack —— 每个activity中的back stack实体都是一个发生过的fragment事务的记录。back stack容许用户经过按下 BACK 按键从一个fragment事务后退（日后导航）。spa

一、Fragment的生命周期图：orm

二、Fragment与Activity生命周期对比：生命周期

三、实际验证：事务

演示 : 切换到该Fragment
it

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
List

屏幕灭掉：fragment

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
im

屏幕解锁margin

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

切换到其余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

切换回自己的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): onPause11-29 14:37:03.155: D/AppListFragment(7649): onStop11-29 14:37:03.155: D/AppListFragment(7649): onDestroyView11-29 14:37:03.165: D/AppListFragment(7649): onDestroy11-29 14:37:03.165: D/AppListFragment(7649): onDetach