Problem with ViewBindng in Fragments in Android

Question

I had an Activity and used ViewBinding there without problems. Not I created a similar Fragment and intend to use ViewBinding there too. Unfortunately I get error messages, altough I followed the steps mentioned at the google develper page about ViewBinding (https://developer.android.com/topic/libraries/view-binding)

Here you can see the Java file:

package com.example.td.barapp;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.td.barapp.databinding.ActivitySelectionMenuBinding;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link Menu_Fragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class Menu_Fragment extends Fragment {

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;



    public Menu_Fragment() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment Menu_Fragment.
     */
    // TODO: Rename and change types and number of parameters
    public static Menu_Fragment newInstance(String param1, String param2) {
        Menu_Fragment fragment = new Menu_Fragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }

        binding.imageButtonCocktailsEn.setOnClickListener(this);
        binding.imageButtonCocktailsAlcfreeEn.setOnClickListener(this);
        binding.imageButtonLongdrinksEn.setOnClickListener(this);
        binding.imageButtonWhiskyEn.setOnClickListener(this);
        binding.imageButtonLiquorEn.setOnClickListener(this);
        binding.imageButtonBeerEn.setOnClickListener(this);
        binding.imageButtonSoftdrinksEn.setOnClickListener(this);
        binding.imageButtonHotDrinksEn.setOnClickListener(this);
    }


    private Menu_FragmentBinding binding;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_menu_, container, false);

        //Include ViewBinding
        binding = Menu_FragmentBinding.inflate(inflater, container, false);
        View view = binding.getRoot();
        return view;

    }
}

I get the error message "Cannot resolve symbol 'Menu_FragmentBinding'" and "Cannot resolve method 'getRoot()'". I do not understand why I get them. Does anyone of you have an idea? I'd appreciate every comment and I would be thankful for your help.

Answer 1

First of all, don't use trailing underscore in the layout file name. Remove the trailing underscore from fragment_menu_

A binding class is generated for each layout file. By default, the name of the class is based on the name of the layout file, converting it to Pascal case and adding the Binding suffix to it. The above layout filename is activity_main.xml so the corresponding generated class is ActivityMainBinding.

So if the name of your layout file is frargemnt_menu.xml, so the corresponding generated class is FragmentMenuBinding

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        //Inflate using viewbinding
        binding = FragmentMenuBinding.inflate(inflater, container, false);
        return binding.getRoot();

    }