Pageradapter Vs Fragmentstatepageradapter

I downloaded a sample ViewPager project from http://files.mail.ru/EZU6G4, and modified it for my test app. The project I downloaded uses FragmentStatePagerAdapter as the argument i

Solution 1:

This is probably related to the Android Support Library. If you are using that, make sure you use the Fragment classes from the support lib instead of the standard Android distribution.