Getting the current Fragment instance in the viewpager

Question

Below is my code which has 3 Fragment classes each embedded with each of the 3 tabs on ViewPager. I have a menu option. As shown in the onOpt

Answer 1

After reading all comments and answers I am going to explain an optimal solution for this problem. The best option is @rik's solution, so my improvement is base on his.

Instead of having to ask each FragmentClass like

if(FragmentClass1){
   ...
if(FragmentClass2){
   ...
}

Create your own interface, and maker your child fragments implement it, something like

public interface MyChildFragment {
    void updateView(int position);
}

Then, you can do something like this to initiate and update your inner fragments.

Fragment childFragment = (Fragment) mViewPagerDetailsAdapter.instantiateItem(mViewPager,mViewPager.getCurrentItem());

if (childFragment != null) {
   ((MyChildFragment) childFragment).updateView();
}

P.S. Be careful where you put that code, if you call insatiateItem before the system actually create it the savedInstanceState of your child fragment will be null therefor

public void onCreate(@Nullable Bundle savedInstanceState){
      super(savedInstanceState)
}

Will crash your app.

Good luck