How to Access Fragment's Child Views Inside Fragment's Parent Activity

How to access parent Activity View in Fragment

You can use

View view = getActivity().findViewById(R.id.viewid);

Quoting docs

Specifically, the fragment can access the Activity instance with
getActivity() and easily perform tasks such as find a view in the
activity layout

How to access a view of parent fragment from child fragment in navigation component

As i read your Explanation's You Know that ChildFragment Parent is NavHostFragment and NavHostFragment's Parent is ParentFragment.

NavHostFragment navHostFragment = (NavHostFragment) getParentFragment();
Fragment parent = (Fragment) navHostFragment.getParentFragment();
parent.getView().findViewById(R.id.element_id);

I have tried is my demo Project and work's for me.

How to access a particular View inside a Fragment from the parent Activity?

You can use findViewById() on the Activity as long as the object has an id. It will search the Activity's entire view hierarchy, including attached child fragments, and is cleaner/easier to understand.

access parent fragment by child fragment

You can get parent Fragment's reference by :

ParentFragment parentFrag = ((ParentFragment)ChildFragment.this.getParentFragment());
parentFrag.someMethod();

I used this in my ViewPager. If you have other requirement, Interface or EventBus are two of the general ones.

How do I access a view from a Fragment from the Parent Activity?

You could just do this:

Interface:

public interface BtnClickable {
    void myClickMethod(View v);
}

Fragment:

    public class SomeFragment  {
BtnClickable btnClickable;
    //...onCreateView, etc.

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
    View root = inflater.inflate(R.layout.fragment_add_note, container, false);
    Button btnGoToSignUp = root.findViewById(R.id.btnGoToSignUp);

    btnGoToSignUp.setOnClickListener(new OnClickListener() {
        public void onClick(View v)
        {
    btnClickable.myClickMethod(v);
        } 
    });

    }
public static void setClickListener(BtnClickable listener){
btnClickable=listener;
}

Activity:

    class MyActivity implements BtnClickable {

        //...onCreate etc instantiating your fragments
               public void onCreate(Bundle savedInstanceState)
    {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.filters); 
        SomeFragment.setClickListener(this); 

    }

        public void myClickMethod(View v) {
       // you can listen here for btn clicked 

        }

}

Android : Acces parent fragment function from child fragment

Try this..

NavHostFragment navHostFragment = (NavHostFragment) getParentFragment();
ParentFragment parent = (ParentFragment) navHostFragment.getParentFragment();
parent.changeName()

Access Fragment viewPager in Parent Activity

add this code in your onBackPressed()

fragobjTab = (TabFragment) getSupportFragmentManager().findFragmentById(R.id.containerView);
        try {
            fragobjTab.onBackPressed();

        }catch (Exception e){
            e.printStackTrace();
        }

And create a onBackPressed method in your tabFragment and setCurrentItem to the ViewPager:

 public void onBackPressed()
{
    // set page to your viewPager
    // 0 is your first viewpager fragment
    viewPager.setCurrentItem(0,true);
}

Access Parent Fragment method from Child Fragment

onCreateView might be too early, try doing that onViewCreated, or onStart in the worst case.

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