比图android旋转屏幕，又竖屏到横屏，activity的生命周期onPause->onStop->onDestroy->onCreate->onStart->OnResume
API level 13 or higher，you should set this config instead:
android:configChanges="orientation|screenSize"
然后旋转屏幕，只会调用onConfigurationChanged，不会创建新activity.
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