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:

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Answer 1

As far as I have tried I think this will work Please try and let me know. Do something like this in your activity.

---

public boolean isFragmentVisible(SwipeAdapter swipeAdapter) {
        SwipeAdapter swipeAdapterA = fragmentA.getViewPagerAdapter();
        BFragment bFragment = (BFragment) swipeAdapterA.getFragment(0);
        if (bFragment != null) {
            SwipeAdapter swipeAdapterB = bFragment.getViewPagerAdapter();
            CFragment cFragment = (CFragment) swipeAdapterA.getFragment(0);
            if (cFragment != null) {
                SwipeAdapter swipeAdapterC = cFragment.getViewPagerAdapter();
                DFragment dFragment = (DFragment) swipeAdapterA.getFragment(0);
                if (dFragment != null) {
                    return dFragment.isFragmentVisible();
                }
            }
        }
        return false;
    }

Use this class as your viewpager adapter

  class SwipeAdapter extends FragmentPagerAdapter {
        private Map mFragmentTags;
        private FragmentManager mFragmentManager;

        private String mPagetile[];

        public SwipeAdapter(FragmentManager fm, Context context) {
            super(fm);
            mPagetile = context.getResources().getStringArray(R.array.pageTitle);
            mFragmentManager = fm;
            mFragmentTags = new HashMap<>();
        }

        @Override
        public Fragment getItem(int position) {
            switch (position) {
                case 0:
                    return new "Your_fragment";
                default:
                    break;
            }
            return null;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            Object obj = super.instantiateItem(container, position);
            if (obj instanceof Fragment) {
                Fragment f = (Fragment) obj;
                String tag = f.getTag();
                mFragmentTags.put(position, tag);
            }
            return obj;
        }

        public Fragment getFragment(int position) {
            String tag = mFragmentTags.get(position);
            if (tag == null)
                return null;
            return mFragmentManager.findFragmentByTag(tag);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mPagetile[position];
        }

        @Override
        public int getCount() {
            return "Number of fragments";
        }
    }

Now in your DFragment do this

 boolean isVisible=false;

        @Override
        public void setMenuVisibility(boolean menuVisible) {
            super.setMenuVisibility(menuVisible);
            isVisible=menuVisible;
        }

        public boolean isFragmentVisible(){
            return isVisible;
        }

Let me know if it worked if not let me know the reason.