Activity生命周期回顾

先来一张经典的生命周期图：

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工程代码： ActivityLifeCycle.zip

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1. 启动Activity 1：

08-24 17:24:51.760: D/CARLOZ-A1(20109): onCreate
08-24 17:24:51.760: D/CARLOZ-A1(20109): onStart
08-24 17:24:51.760: D/CARLOZ-A1(20109): onResume

1.1. 返回键 关闭Activity 1：

08-24 17:25:45.960: D/CARLOZ-A1(20109): onPause
08-24 17:25:46.790: D/CARLOZ-A1(20109): onStop
08-24 17:25:46.790: D/CARLOZ-A1(20109): onDestroy

1.2 HOME键回主屏，再从Recent Task中重新打开Activity1

08-24 17:26:37.610: D/CARLOZ-A1(20109): onPause
08-24 17:26:38.340: D/CARLOZ-A1(20109): onStop

从recent task中重新打开Activity1
08-24 17:26:59.380: D/CARLOZ-A1(20109): onRestart
08-24 17:26:59.380: D/CARLOZ-A1(20109): onStart
08-24 17:26:59.380: D/CARLOZ-A1(20109): onResume

1.3 HOME键回主屏，从Recent Task中杀死Activity1， 在从Launcher打开Activity1

08-24 17:28:06.670: D/CARLOZ-A1(20109): onPause
08-24 17:28:07.450: D/CARLOZ-A1(20109): onStop

08-24 17:28:15.860: D/CARLOZ-A1(22178): onCreate
08-24 17:28:15.860: D/CARLOZ-A1(22178): onStart
08-24 17:28:15.860: D/CARLOZ-A1(22178): onResume

2. 两个Activity切换

2.1 Activity1 打开Activity 2，再用返回键返回Activity1

08-24 17:32:33.150: D/CARLOZ-A1(24696): onPause
08-24 17:32:33.200: D/CARLOZ-A2(24696): onCreate
08-24 17:32:33.210: D/CARLOZ-A2(24696): onStart
08-24 17:32:33.210: D/CARLOZ-A2(24696): onResume
此时Activity2 完全覆盖Activity 1
08-24 17:32:33.750: D/CARLOZ-A1(24696): onStop


从Activity 2 返回Activity 1
08-24 17:34:06.330: D/CARLOZ-A2(24696): onPause
08-24 17:34:06.360: D/CARLOZ-A1(24696): onRestart
08-24 17:34:06.370: D/CARLOZ-A1(24696): onStart
08-24 17:34:06.370: D/CARLOZ-A1(24696): onResume
08-24 17:34:06.790: D/CARLOZ-A2(24696): onStop
08-24 17:34:06.790: D/CARLOZ-A2(24696): onDestroy

2.2 将Activity2 换成 Dialog（不能完全覆盖Activity1）

08-24 17:37:39.680: D/CARLOZ-A1(26589): onPause
08-24 17:37:39.740: D/CARLOZ-A2(26589): onCreate
08-24 17:37:39.740: D/CARLOZ-A2(26589): onStart
08-24 17:37:39.740: D/CARLOZ-A2(26589): onResume
可以看到，Activity1 不再执行onStop

从Activity2返回Activity1
08-24 17:38:15.180: D/CARLOZ-A2(26589): onPause
08-24 17:38:15.220: D/CARLOZ-A1(26589): onResume  可以看到Activity1 也不再执行onStart方法
08-24 17:38:15.290: D/CARLOZ-A2(26589): onStop
08-24 17:38:15.290: D/CARLOZ-A2(26589): onDestroy

2.2.1 Activity2是dialog, 点击Recent Task

08-24 17:40:42.000: D/CARLOZ-A2(26589): onPause
08-24 17:40:42.010: D/CARLOZ-A1(26589): onStop
08-24 17:40:42.080: D/CARLOZ-A2(26589): onStop

从Recent Task状态返回
08-24 17:41:24.430: D/CARLOZ-A1(26589): onRestart
08-24 17:41:24.440: D/CARLOZ-A1(26589): onStart
08-24 17:41:24.440: D/CARLOZ-A2(26589): onRestart
08-24 17:41:24.440: D/CARLOZ-A2(26589): onStart
08-24 17:41:24.440: D/CARLOZ-A2(26589): onResume

3. 单个Activity转屏

08-24 17:43:56.050: D/CARLOZ-A1(26589): onPause
08-24 17:43:56.050: D/CARLOZ-A1(26589): onStop
08-24 17:43:56.050: D/CARLOZ-A1(26589): onDestroy

08-24 17:43:56.210: D/CARLOZ-A1(26589): onCreate
08-24 17:43:56.210: D/CARLOZ-A1(26589): onStart
08-24 17:43:56.210: D/CARLOZ-A1(26589): onResume

4. Activity2是Dialog的状态下转屏

08-24 17:43:11.470: D/CARLOZ-A2(26589): onPause
08-24 17:43:11.470: D/CARLOZ-A2(26589): onStop
08-24 17:43:11.470: D/CARLOZ-A2(26589): onDestroy
08-24 17:43:11.630: D/CARLOZ-A2(26589): onCreate
08-24 17:43:11.630: D/CARLOZ-A2(26589): onStart
08-24 17:43:11.630: D/CARLOZ-A2(26589): onResume

08-24 17:43:11.650: D/CARLOZ-A1(26589): onStop
08-24 17:43:11.650: D/CARLOZ-A1(26589): onDestroy
08-24 17:43:11.780: D/CARLOZ-A1(26589): onCreate
08-24 17:43:11.790: D/CARLOZ-A1(26589): onStart
08-24 17:43:11.800: D/CARLOZ-A1(26589): onResume
08-24 17:43:11.820: D/CARLOZ-A1(26589): onPause

注意： 有Dialog主题的Activity2会导致 Activity1执行 onPause，但是纯粹的Dialog却不能触发Activity1执行onPause

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工程代码： ActivityLifeCycle.zip

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