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?Activity A??????Activity B?B??????????????A?????????OnCreate()??????????????????????????
?AndroidManifest.xml???configChanges????Activity A???android:configChanges="orientation|screenSize"????????????????????????????Activity?????API??13????????????????
??onConfigurationChanged????Activity??????????????????????????????????????????????????????????????????????????Activity???????
??Fragment???????????????Fragment??????????????Fragment????????????Activity????
????????????????????????????????????????????Activity?
?????????????ActivityA????????????????????????
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