Activity restart on rotation Android

In my Android application, when I rotate the device (slide out the keyboard) then my Activity is restarted (onCreate is called). Now, this is probably how it's supposed to be, but I do a lot of initial setting up in the onCreate method, so I need either: Put all the initial setting up in another function so it's not all lost on device rotation or Make it so onCreate is not called again and the lay

[tokumeidanshi]

Androidで画面ローテーションイベントでアクティビティの再起動を防ぐ方法