How to hide BottomNavigation bar(Botton Navigation Bar Activity) in specific Fragment

Question

I know I am not the first to ask this question but I have referred many SO post regarding this but nothing is solved my query .

What I want to do is in my MainActivity(Bottom Navigation bar Activity) I have Bottom Navigation Bar, In this MainActivity I have cardviews If I clicked on the cardview I need to show another fragment in that fragment I want to hide the bottom navigation bar .And When I nav back to MainActivity botoom Navigation bar should be there.

Here in my case Alarm.java is the fragment where I want to hide the bottom navigation bar.

Alarm.java

public class Alarm extends Fragment {

    private OnFragmentInteractionListener mListener;

    public Alarm() {

    }

    public static Alarm newInstance(String param1, String param2) {
        Alarm fragment = new Alarm();
        Bundle args = new Bundle();
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {

        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_alarm, container, false);
    }

    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnFragmentInteractionListener {
        void onFragmentInteraction(Uri uri);
    }
}

Answer 1

I have tried the method by @Suleyman but it didn't work for me. The simplest solution is to use a public static method in the MainActivity and reference it from the fragment where you want to hide the bottom navigation bar.

Don't forget to initialize navView as public static.

In your MainActivity

    public static void hideBottomNav(){
        navView.setVisibility(View.GONE);
    }

    public static void showBottomNav(){
        navView.setVisibility(View.GONE);
    }

In your MyFragment

    @Override
    public void onResume() {
        super.onResume();
        MainActivity.hideBottomNav();
    }

    @Override
    public void onStop() {
        super.onStop();
        MainActivity.showBottomNav();
    }

Answer 2

In your MainActivity you can implement two methods that will be responsible for showing and hiding your BottomNavigationView. For example, these two methods animate it sliding up and down:

private void hideBottomNavigationView(BottomNavigationView view) {
    view.clearAnimation();
    view.animate().translationY(view.getHeight()).setDuration(300);
}

public void showBottomNavigationView(BottomNavigationView view) {
    view.clearAnimation();
    view.animate().translationY(0).setDuration(300);
}

In MainActivity you call hide right before opening your CardView, and call show in onCreate or onResume.

EDIT:

But, I think that a cleaner way would probably be to create an interface in your Fragment:

public interface OnCardViewOpenedInterface{
    void onOpen(); // hide bottom bar when photo is opened
    void onClose(); // show bottom bar when photo is opened
}

And call these methods in onStop and onResume of your Fragment:

@Override
public void onStop() {
    super.onStop();
    mListener.onClose();
}

@Override
public void onResume() {
    super.onResume();
    mListener.onOpen();
}

And then implement the interface in your MainActivity, override the methods onOpen() and onClose() and inside call your hide and show methods.

They will probably both work, maybe the second one is overcomplicated, it's just I like it more.