A啓動的流程如下：
2020-03-18 23:52:10.854 2720-2720/com.mobilevoice.findyou I/TestActivity: A = onCreate
2020-03-18 23:52:10.861 2720-2720/com.mobilevoice.findyou I/TestActivity: A = onStart
2020-03-18 23:52:10.864 2720-2720/com.mobilevoice.findyou I/TestActivity: A = onResume
A啓動B流程如下：
2020-03-18 23:48:26.720 2720-2720/com.mobilevoice.findyou I/TestActivity: A = onPause
2020-03-18 23:48:26.747 2720-2720/com.mobilevoice.findyou I/TestActivity: B = onCreate
2020-03-18 23:48:26.753 2720-2720/com.mobilevoice.findyou I/TestActivity: B = onStart
2020-03-18 23:48:26.755 2720-2720/com.mobilevoice.findyou I/TestActivity: B = onResume
2020-03-18 23:48:27.141 2720-2720/com.mobilevoice.findyou I/TestActivity: A = onStop
B返回到A到流程如下：
2020-03-18 23:49:25.841 2720-2720/com.mobilevoice.findyou I/TestActivity: B = onPause
2020-03-18 23:49:25.869 2720-2720/com.mobilevoice.findyou I/TestActivity: A = onStart
2020-03-18 23:49:25.871 2720-2720/com.mobilevoice.findyou I/TestActivity: A = onResume
2020-03-18 23:49:26.140 2720-2720/com.mobilevoice.findyou I/TestActivity: B = onStop
2020-03-18 23:49:26.141 2720-2720/com.mobilevoice.findyou I/TestActivity: B = onDestroy
在B的Activity中onCreate方法裏調用finish方法的情況：
2020-03-09 10:55:54.742 4966-4966/com.demo.liveroom I/test: B = onCreate
2020-03-09 10:55:54.893 4966-4966/com.demo.liveroom I/test: B = onDestroy
省略掉執行其他生命週期的方法
在B的Activity中onStart方法裏調用finish方法的情況：
2020-03-09 11:02:03.427 5593-5593/com.demo.liveroom I/test: B = onCreate
2020-03-09 11:02:03.442 5593-5593/com.demo.liveroom I/test: B = onStart
2020-03-09 11:02:03.579 5593-5593/com.demo.liveroom I/test: B = onStop
2020-03-09 11:02:03.580 5593-5593/com.demo.liveroom I/test: B = onDestroy
在B的Activity中onResume方法裏調用finish方法的情況：
2020-03-09 11:04:11.640 6087-6087/com.demo.liveroom I/test: B = onCreate
2020-03-09 11:04:11.655 6087-6087/com.demo.liveroom I/test: B = onStart
2020-03-09 11:04:11.753 6087-6087/com.demo.liveroom I/test: B = onResume
2020-03-09 11:04:11.767 6087-6087/com.demo.liveroom I/test: B = onPause
2020-03-09 11:04:11.895 6087-6087/com.demo.liveroom I/test: B = onStop
2020-03-09 11:04:11.896 6087-6087/com.demo.liveroom I/test: B = onDestroy