android旋转屏幕不新建Activity

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.