한 레이아웃에 프래그먼트 여러개 예시

ListFragment.java

package com.example.myfragment2;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public class ListFragment extends Fragment {
    MainActivity activity;

    @Override
    public void onAttach(@NonNull Context context) {
        super.onAttach(context);

        activity = (MainActivity)getActivity();
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        ViewGroup rootView = (ViewGroup)inflater.inflate(R.layout.fragment_list, container,false);
        Button button = (Button) rootView.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                activity.onImageChange(0);
            }
        });
        Button button2 = (Button) rootView.findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                activity.onImageChange(1);
            }
        });
        Button button3 = (Button) rootView.findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                activity.onImageChange(2);
            }
        });
        return rootView;
    }
}