Activity和Fragment的生命周期

1、activity嵌套frament ，生命周期方法执行顺序

activity和fragment生命周期方法.png

2、横竖屏切换activity生命周期方法调用情况（android10）

（1）不设置Activity的android:configChanges
打开activity

>>>>>>>ui.HomeActivity: onCreate()
>>>>>>>ui.HomeActivity: onStart()
>>>>>>>ui.HomeActivity: onResume()

切横屏

>>>>>>>ui.HomeActivity: onPause()
>>>>>>>ui.HomeActivity: onStop()
>>>>>>>ui.HomeActivity: onDestroy()
>>>>>>>ui.HomeActivity: onCreate()
>>>>>>>ui.HomeActivity: onStart()
>>>>>>>ui.HomeActivity: onResume()

切回竖屏

>>>>>>>ui.HomeActivity: onPause()
>>>>>>>ui.HomeActivity: onStop()
>>>>>>>ui.HomeActivity: onDestroy()
>>>>>>>ui.HomeActivity: onCreate()
>>>>>>>ui.HomeActivity: onStart()
>>>>>>>ui.HomeActivity: onResume()

（2）设置Activity的 android:configChanges="orientation"
切换横竖屏只执行了

>>>>>>>ui.HomeActivity: onConfigurationChanged()

（3）设置Activity的android:configChanges=”orientation |keyboardHidden|screenSize”
切换横竖屏只执行了

>>>>>>>ui.HomeActivity: onConfigurationChanged()

注意

Android 3.2（API 13）,设置android:configChanges="orientation|keyboardHidden"起作用,
Android 3.2（API 13）之后,还必须设置"screenSize"
android:configChanges="keyboardHidden|orientation|screenSize"，否则不会调用onConfigurationChanged()方法

3、按home，黑屏时，activity和fragment生命周期方法执行情况

>>>>>>>OneFragment: onPause()
>>>>>>>ui.HomeActivity: onPause()
>>>>>>>OneFragment: onStop()
>>>>>>>ui.HomeActivity: onStop()

恢复

>>>>>>>OneFragment: onStart()
>>>>>>>ui.HomeActivity: onStart()
>>>>>>>ui.HomeActivity: onResume()
>>>>>>>OneFragment: onResume()