android fragment中使用viewpager报空指针，vpBanner 这里就是空了

Answer 1

vpBanner is initialized in Fragment and uses rootView to findView

Answer 2

You can put this initView and initDot into fragment.

Answer 3

vpBanner = (ViewPager) findViewById(R.id.vpBanner); This assignment means to find the control with the id vpBanner in the current activity layout. This control does not exist in your activity_main.xml. You should load the fragment_main.xml layout first,
fragmentView = getLayoutInflater().inflate(R.layout.more_view,null); then
vpBanner = (ViewPager) fragmentView.findViewById(R.id.vpBanner);