fragment与activity的生命周期方法是一致的吗_请描述activity的生命周期

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在学Fragment之前肯定学过了Activity，Activity有属于自己的生命周期，Fragment基本上和activity 大体一样，但是有自己特有的生命周期方法，下面我们一起来看一下。

说白了主要看两张图，和运行代码：

一. Fragment的生命周期

二. 与Activity生命周期的对比

三. 场景演示 :

①启动Fragment

07-05 11:14:48.791 16273-16273/com.mypractice E/—-A Activity—-: onCreate 07-05 11:14:48.809 16273-16273/com.mypractice E/—-A Activity—-: onStart 07-05 11:14:48.809 16273-16273/com.mypractice E/—-A Fragment—-: onAttach 07-05 11:14:48.809 16273-16273/com.mypractice E/—-A Fragment—-: onCreate 07-05 11:14:48.809 16273-16273/com.mypractice E/—-A Fragment—-: onCreateView 07-05 11:14:48.813 16273-16273/com.mypractice E/—-A Fragment—-: onActivityCreated 07-05 11:14:48.813 16273-16273/com.mypractice E/—-A Fragment—-: onStart 07-05 11:14:48.813 16273-16273/com.mypractice E/—-A Activity—-: onResume 07-05 11:14:48.813 16273-16273/com.mypractice E/—-A Fragment—-: onResume ②锁屏（注意此处Fragment的onSaveInstanceState方法执行，但是Activity的此方法并未执行，解释见文末尾注释）：

07-05 11:18:36.007 16273-16273/com.mypractice E/—-A Activity—-: onPause 07-05 11:18:36.007 16273-16273/com.mypractice E/—-A Fragment—-: onPause

07-05 11:18:36.007 16273-16273/com.mypractice E/—-A Fragment—-:onSaveInstanceState

07-05 11:18:36.193 16273-16273/com.mypractice E/—-A Activity—-: onStop 07-05 11:18:36.194 16273-16273/com.mypractice E/—-A Fragment—-: onStop

③解锁：

07-05 11:19:20.898 16273-16273/com.mypractice E/—-A Activity—-: onRestart 07-05 11:19:20.899 16273-16273/com.mypractice E/—-A Activity—-: onStart 07-05 11:19:20.899 16273-16273/com.mypractice E/—-A Fragment—-: onStart 07-05 11:19:20.910 16273-16273/com.mypractice E/—-A Activity—-: onResume 07-05 11:19:20.910 16273-16273/com.mypractice E/—-A Fragment—-: onResume

④切换到其它 Fragment（A –> B）：

07-05 11:21:02.961 16273-16273/com.mypractice E/—-A Activity—-: onPause 07-05 11:21:02.961 16273-16273/com.mypractice E/—-A Fragment—-: onPause 07-05 11:21:02.999 16273-16273/com.mypractice E/—-B Fragment—-: onAttach 07-05 11:21:02.999 16273-16273/com.mypractice E/—-B Fragment—-: onCreate 07-05 11:21:03.000 16273-16273/com.mypractice E/—-B Fragment—-: onCreateView 07-05 11:21:03.002 16273-16273/com.mypractice E/—-B Fragment—-: onActivityCreated 07-05 11:21:03.002 16273-16273/com.mypractice E/—-B Fragment—-: onStart 07-05 11:21:03.003 16273-16273/com.mypractice E/—-B Fragment—-: onResume

07-05 11:21:03.900 6921-6921/kj.com.mypractice E/—-A Fragment—-: onSaveInstanceState 07-05 11:21:03.452 16273-16273/com.mypractice E/—-A Activity—-: onStop 07-05 11:21:03.452 16273-16273/com.mypractice E/—-A Fragment—-: onStop

⑤Back键返回（B –> A）：

07-05 11:23:32.094 16273-16273/com.mypractice E/—-B Fragment—-: onPause 07-05 11:23:32.099 16273-16273/com.mypractice E/—-A Activity—-: onRestart 07-05 11:23:32.100 16273-16273/com.mypractice E/—-A Activity—-: onStart 07-05 11:23:32.100 16273-16273/com.mypractice E/—-A Fragment—-: onStart 07-05 11:23:32.100 16273-16273/com.mypractice E/—-A Activity—-: onResume 07-05 11:23:32.100 16273-16273/com.mypractice E/—-A Fragment—-: onResume 07-05 11:23:32.515 16273-16273/com.mypractice E/—-B Fragment—-: onStop 07-05 11:23:32.516 16273-16273/com.mypractice E/—-B Fragment—-: onDestroyView 07-05 11:23:32.516 16273-16273/com.mypractice E/—-B Fragment—-: onDestroy 07-05 11:23:32.516 16273-16273/com.mypractice E/—-B Fragment—-: onDetach

⑥Home键回到桌面：

07-05 11:25:56.622 16273-16273/com.mypractice E/—-A Activity—-: onPause 07-05 11:25:56.623 16273-16273/com.mypractice E/—-A Fragment—-: onPause

07-05 11:51:26.861 6921-6921/kj.com.mypractice E/—-A Fragment—-: onSaveInstanceState 07-05 11:25:57.252 16273-16273/com.mypractice E/—-A Activity—-: onStop 07-05 11:25:57.252 16273-16273/com.mypractice E/—-A Fragment—-: onStop

⑦Home键之后返回应用：

07-05 11:26:48.603 16273-16273/com.mypractice E/—-A Activity—-: onRestart 07-05 11:26:48.603 16273-16273/com.mypractice E/—-A Activity—-: onStart 07-05 11:26:48.603 16273-16273/com.mypractice E/—-A Fragment—-: onStart 07-05 11:26:48.603 16273-16273/com.mypractice E/—-A Activity—-: onResume 07-05 11:26:48.603 16273-16273/com.mypractice E/—-A Fragment—-: onResume

⑧退出Activity（即退出Fragment）：

07-05 11:28:17.679 16273-16273/com.mypractice E/—-A Activity—-: onPause 07-05 11:28:17.679 16273-16273/com.mypractice E/—-A Fragment—-: onPause 07-05 11:28:18.109 16273-16273/com.mypractice E/—-A Activity—-: onStop 07-05 11:28:18.110 16273-16273/com.mypractice E/—-A Fragment—-: onStop 07-05 11:28:18.110 16273-16273/com.mypractice E/—-A Activity—-: onDestroy 07-05 11:28:18.110 16273-16273/com.mypractice E/—-A Fragment—-: onDestroyView 07-05 11:28:18.111 16273-16273/com.mypractice E/—-A Fragment—-: onDestroy 07-05 11:28:18.111 16273-16273/com.mypractice E/—-A Fragment—-: onDetach

补充：两Activity跳转生命周期方法执行顺序：

① A –> B

07-05 11:32:23.460 27917-27917/kj.com.mypractice E/—-A Activity—-: onPause

07-05 11:32:23.513 27917-27917/kj.com.mypractice E/—-B Activity—-: onCreate

07-05 11:32:23.513 27917-27917/kj.com.mypractice E/—-B Activity—-: onStart 07-05 11:32:23.513 27917-27917/kj.com.mypractice E/—-B Activity—-: onResume 07-05 11:32:23.953 27917-27917/kj.com.mypractice E/—-A Activity—-: onStop ② B –> A

07-05 11:37:45.538 27917-27917/kj.com.mypractice E/—-B Activity—-: onPause 07-05 11:37:45.547 27917-27917/kj.com.mypractice E/—-A Activity—-: onRestart 07-05 11:37:45.547 27917-27917/kj.com.mypractice E/—-A Activity—-: onStart 07-05 11:37:45.547 27917-27917/kj.com.mypractice E/—-A Activity—-: onResume 07-05 11:37:45.976 27917-27917/kj.com.mypractice E/—-B Activity—-: onStop 07-05 11:37:45.976 27917-27917/kj.com.mypractice E/—-B Activity—-: onDestroy

注释：

Activity可能被杀死也就是异常终止，之后： OnSaveInstanceState（onStop之前） –> OnRestoreInstanceState（onStart之后）

正常结束只有BACK键 ， 异常终止的情况（注意是可能，并不是一定）：

1、资源相关的系统配置被改变，比如横竖屏、输入法显示和隐藏

2、 系统内存不足时

3、HOME键或者锁屏

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