fragments in viewpager, no view found error

Question

I have an activity holding a fragment, in this fragment there is a button , when it is clicked, a dialog is popped out.

In this dialog, there is a Viewpager, which

Answer 1

getChildFragmentManager() is available since API 17 while you're using the v4 support library. Try using the support fragment manager instead:

PagerDialog dialog = new PagerDialog(getActivity(),
        getActivity().getSupportFragmentManager());