PagerAdapter implementation that represents each page as a Fragment that is
persistently kept in the fragment manager as long as a user can return to the page.PagerAdapter implementation that represents each page as a Fragment.Fragment associated with the specified position.Fragment associated with the specified position.FragmentPagerAdapter.setPrimaryItem(ViewGroup, int, Object).FragmentStatePagerAdapter.setPrimaryItem(ViewGroup, int, Object).FragmentPagerAdapter
and FragmentStatePagerAdapter from the
Android support repository.