java - Check if fragment is currently visible or no

Question

I know there are lots of similar questions in StackOverflow but my question is little different.

I have nested hierarchy of Fragments like in below structure:

                                  Activity
                                     |
                                     |
                                 AFragment
                                     |
                                (ViewPager)
                                 |       |         
                                 |       |         
                         BFragment       BFragment  .....
                            |                       
                       (ViewPager)                       
                        |       |                         
                        |       |                         
                 CFragment     CFragment  ...
                     |
                (ViewPager)                       
                  |     |                              
                  |     |                        
           DFragment   DFragment ...

Now i want to know that whether DFragment is showing to user or not?

I tried lots of solution from StackOverflow but couldn't get sucess.

What i tried is:

I tried setUserVisibleHint() but it returns truefor multiple DFragment in above hierarchy which is a cause of ViewPager

I also tried from these links: link1, link2, link3 and so on... but did not got actual solution.

Waiting for help. Thank you.

UPDATE

Adapter Class

class ViewPagerAdapter extends FragmentPagerAdapter {
        private final List<Fragment> mFragmentList = new ArrayList<>();
        private final List<String> mFragmentTitleList = new ArrayList<>();

        public ViewPagerAdapter(FragmentManager manager) {
            super(manager);
        }

        @Override
        public Fragment getItem(int position) {
            return mFragmentList.get(position);
        }

        @Override
        public int getCount() {
            return mFragmentList.size();
        }

        public void addFragment(Fragment fragment, String title) {
            mFragmentList.add(fragment);
            mFragmentTitleList.add(title);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mFragmentTitleList.get(position);
        }
    }

Answer 1

You can check, whether the View that fragment inflated is visible on the device's screen:

    Fragment fragment = ... // retrieve from `ViewPager`'s adapter.
    View fragmentRootView = fragment.getView();
    if (fragmentRootView != null && fragmentRootView.getGlobalVisibleRect(new Rect())) {
        // fragment is visible
    } else {
        // fragment is not visible
    }

getGlobalVisibleRect() will return true if part of the view is visible at the root level.