Checkbox's isChecked getting NullPointerException.

I have an activity with 6 fragments(Swipe disabled). For each fragment I have 2 button( next and previous) which move to 1 fragment next and previous perfectly. I have 2 checkboxes which I need to check if they are checked or not before migrating to next activity. But I get null pointer because checkboxes are initialized in onCreateView Method but the fragment is loaded already due to viewpager. How can I check if checkboxes are checked or not?