Bottom Navigation Bar

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="vertical">

        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="@color/colorPrimary" />

        <com.google.android.material.bottomnavigation.BottomNavigationView
            android:id="@+id/bottomNavigation"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:menu="@menu/bottom_navigation" />
    </LinearLayout>
</RelativeLayout>

package in.hindicode.example;

import android.os.Bundle;
import android.view.MenuItem;
import android.widget.FrameLayout;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.navigation.NavigationBarView;

public class MainActivity extends AppCompatActivity {

    private FrameLayout frameLayout;
    private BottomNavigationView bottomNavigationView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Initializing widgets
        frameLayout = findViewById(R.id.frameLayout);
        bottomNavigationView = findViewById(R.id.bottomNavigation);

        // Setting default fragment
        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction().replace(R.id.frameLayout, new HomeFragment()).commit();
        }

        // Bottom Navigation
        bottomNavigationView.setOnItemSelectedListener(new NavigationBarView.OnItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
                // Getting MenuItem id in a variable
                int id = menuItem.getItemId();

                // If else if statement for fragment
                if (id == R.id.bottom_nav_home) {
                    getSupportFragmentManager().beginTransaction().replace(R.id.frameLayout, new HomeFragment()).commit();
                } else if (id == R.id.bottom_nav_account) {
                    getSupportFragmentManager().beginTransaction().replace(R.id.frameLayout, new AccountFragment()).commit();
                } else if (id == R.id.bottom_nav_setting) {
                    getSupportFragmentManager().beginTransaction().replace(R.id.frameLayout, new SettingFragment()).commit();
                }
                return true;
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/bottom_nav_home"
        android:icon="@drawable/ic_home"
        android:title="Home" />
    <item
        android:id="@+id/bottom_nav_account"
        android:icon="@drawable/ic_account"
        android:title="Account" />
    <item
        android:id="@+id/bottom_nav_setting"
        android:icon="@drawable/ic_setting"
        android:title="Setting" />
</menu>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@color/tomato"
    android:gravity="center"
    tools:context=".HomeFragment">

    <androidx.appcompat.widget.AppCompatTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="24sp"
        android:text="Home Fragment"
        android:textColor="@color/white"
        android:gravity="center"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/green"
    android:gravity="center"
    android:orientation="vertical"
    tools:context=".AccountFragment">

    <androidx.appcompat.widget.AppCompatTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Account Fragment"
        android:textColor="@color/white"
        android:textSize="24sp" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/blue_dark"
    android:gravity="center"
    android:orientation="vertical"
    tools:context=".SettingFragment">

    <androidx.appcompat.widget.AppCompatTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Setting Fragment"
        android:textColor="@color/white"
        android:textSize="24sp" />
</LinearLayout>

package in.hindicode.example;

import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


public class HomeFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_home, container, false);
    }
}

package in.hindicode.example;

import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


public class AccountFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_account, container, false);
    }
}

package in.hindicode.example;

import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class SettingFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_setting, container, false);
    }
}