viewpager not working with photo view library

Viewpager and zooming ability are not working at the same time.When I include `photoView.setVisibility(View.GONE);` in FullImageActivity.java, viewpager starts working and when I remove it, zooming ability starts working. But both zooming and viewpager do not work at the same time.
[code available here](https://stackoverflow.com/questions/46519533/how-to-make-photoview-library-work-with-viewpager)