Android切换横屏竖屏生命周期变化
16lz
2021-01-23
横竖屏切换
1 切换到横屏
onSaveInstanceState
onPause
onStop
onDestroy
onCreate
onStart
onRestoreInstanceState
onResume
2 切换到竖屏,销毁了两次
onSaveInstanceState
onPause
onStop
onDestroyonCreate
onStart
onRestoreInstanceState
onResume
onSaveInstanceState
onPause
onStop
onDestroy
onCreate
onStart
onRestoreInstanceState
onResume
3 修改AndroidManifest.xml,把该Activity添加 android:configChanges="orientation",切横屏,只销毁一次。
onSaveInstanceState
onPause
onStop
onDestroy
onCreate
onStart
onRestoreInstanceState
onResume
4 再切回竖屏,发现不会再打印相同信息,但多打印了一行onConfigChanged
onSaveInstanceState
onPause
onStop
onDestroy
onCreate
onStart
onRestoreInstanceState
onResume
onConfigurationChanged
5 更改 android:configChanges="orientation" 改成 android:configChanges="orientation|keyboardHidden",切横屏,就只打印onConfigChanged
onConfigurationChanged
6 切回竖屏
onConfigurationChanged
onConfigurationChanged
总结:
1、不设置Activity的android:configChanges时,切屏会重新调用各个生命周期,切横屏时会执行一次,切竖屏时会执行两次
2、设置Activity的android:configChanges="orientation"时,切屏还是会重新调用各个生命周期,切横、竖屏时只会执行一次
1 切换到横屏
onSaveInstanceState
onPause
onStop
onDestroy
onCreate
onStart
onRestoreInstanceState
onResume
2 切换到竖屏,销毁了两次
onSaveInstanceState
onPause
onStop
onDestroyonCreate
onStart
onRestoreInstanceState
onResume
onSaveInstanceState
onPause
onStop
onDestroy
onCreate
onStart
onRestoreInstanceState
onResume
3 修改AndroidManifest.xml,把该Activity添加 android:configChanges="orientation",切横屏,只销毁一次。
onSaveInstanceState
onPause
onStop
onDestroy
onCreate
onStart
onRestoreInstanceState
onResume
4 再切回竖屏,发现不会再打印相同信息,但多打印了一行onConfigChanged
onSaveInstanceState
onPause
onStop
onDestroy
onCreate
onStart
onRestoreInstanceState
onResume
onConfigurationChanged
5 更改 android:configChanges="orientation" 改成 android:configChanges="orientation|keyboardHidden",切横屏,就只打印onConfigChanged
onConfigurationChanged
6 切回竖屏
onConfigurationChanged
onConfigurationChanged
总结:
1、不设置Activity的android:configChanges时,切屏会重新调用各个生命周期,切横屏时会执行一次,切竖屏时会执行两次
2、设置Activity的android:configChanges="orientation"时,切屏还是会重新调用各个生命周期,切横、竖屏时只会执行一次
3、设置Activity的android:configChanges="orientation|keyboardHidden"时,切屏不会重新调用各个生命周期,只会执行onConfigurationChanged方法。(执行这个方法,必须设置sdk version 大于等于13.0)
附:设置android:screenOrientation="portrait"则无论手机如何变动,拥有这个属性的activity都将是竖屏显示。
同样的,android:screenOrientation="landscape",为横屏显示。
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