MainActivity.java

package com.example.codepredators.myapplication;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.view.menu.MenuView;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {
    
    ImageView view_my_task;
    ImageView freshchat;
    ImageView freshdesk;
    ImageView admob;
    ImageView Flipkart;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        view_my_task = findViewById(R.id.view_my_task);
        freshchat = findViewById(R.id.freshchat);
        freshdesk = findViewById(R.id.freshdesk);
        admob = findViewById(R.id.admob);
        Flipkart = findViewById(R.id.Flipkart);

        view_my_task.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Fragment mFragment = null;
                mFragment = new MyTaskFragment();
                FragmentManager fragmentManager = getSupportFragmentManager();
                fragmentManager.beginTransaction()
                        .replace(R.id.frameLayout, mFragment).commit();
            }
        });

        freshchat.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Fragment mFragment = null;
                mFragment = new FreshchatFragment();
                FragmentManager fragmentManager = getSupportFragmentManager();
                fragmentManager.beginTransaction()
                        .replace(R.id.frameLayout, mFragment).commit();
            }
        });

        freshdesk.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Fragment mFragment = null;
                mFragment = new FreshdeskFragment();
                FragmentManager fragmentManager = getSupportFragmentManager();
                fragmentManager.beginTransaction()
                        .replace(R.id.frameLayout, mFragment).commit();
            }
        });

        admob.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Fragment mFragment = null;
                mFragment = new AdmobFragment();
                FragmentManager fragmentManager = getSupportFragmentManager();
                fragmentManager.beginTransaction()
                        .replace(R.id.frameLayout, mFragment).commit();
            }
        });

        Flipkart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Fragment mFragment = null;
                mFragment = new FlipkartFragment();
                FragmentManager fragmentManager = getSupportFragmentManager();
                fragmentManager.beginTransaction()
                        .replace(R.id.frameLayout, mFragment).commit();
            }
        });

    }
}