Android screen rotation, always re-oncreate

Recently, when working on a project, we need to adapt to the landscape and landscape. For the data and overall effect, we have added the following in the activity Configuration:
Android: configchanges = "keyboardhidden | orientation"

However, after I add it, I still often use oncreate. I always thought it was strange that I didn't know it before. Later I found that I knew it. I still need to add something ,,

Android: configchanges = "keyboardhidden | orientation | screensize"

Http://developer.android.com/guide/topics/manifest/activity-element.html

In the "screensize" description, I found an exciting sentence. The original Article is as follows:
This configuration change does not restart your activity, even when running on an android 3.2 or higher Device