android.support.v4.view.ViewPager是android.app包中的任何等价物，为什么早期版本？

I have few general questions concerning android.support.v4.view.ViewPager. For my app I set as min sdk version 14. However I decided to use android.support.v4.view.ViewPager as it's very simple solution and very friendly for users. However google writes "Note this class is currently under early design and development. The API will likely change in later updates of the compatibility library, requiring changes to the source code of apps when they are compiled against the newer version." I have few general questions concerning android