how to use Bottom navigation in android

Step1:-

Put Frame Layout in Activity where you need to pass fragment.

   <FrameLayout
             android:layout_width="match_parent"
             android:layout_height="match_parent"

             android:id="@+id/main_container"
             >

         </FrameLayout>

Step2: for Bottom navigation

      <com.google.android.material.bottomnavigation.BottomNavigationView
          android:id="@+id/bottomnavigation"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_alignParentBottom="true"
          android:background="@color/white"

          app:menu="@menu/nav_menu" />

Step3:- MainActivity.java

package com.example.firebasedatabase;

import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;

import com.example.firebasedatabase.Adapters.ProductAdapter;
import com.example.firebasedatabase.Fragments.Booking_Fragment;
import com.example.firebasedatabase.Fragments.Home_Fragment;
import com.example.firebasedatabase.Fragments.Profile_Fragment;
import com.example.firebasedatabase.models.ProductModel;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.navigation.NavigationView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    ActionBarDrawerToggle toggle;
    DrawerLayout drawerLayout;
    Toolbar toolbar;
    NavigationView nav;
    BottomNavigationView bnv;

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


        drawerLayout = findViewById(R.id.drawer_layout);
        toolbar= findViewById(R.id.toolbar);
        nav= findViewById(R.id.nav_view);
        bnv = findViewById(R.id.bottomnavigation);
        toggle= new ActionBarDrawerToggle(MainActivity.this,drawerLayout,toolbar,R.string.app_name,R.string.app_name);
        drawerLayout.addDrawerListener(toggle);

        toggle.syncState();






        getSupportFragmentManager().beginTransaction().replace(R.id.main_container,new Home_Fragment()).commit();

        bnv.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item)
            {
                androidx.fragment.app.Fragment temp=null;

                switch (item.getItemId())
                {
                    case R.id.nav_home:  temp= new Home_Fragment();
                        break;
                    case R.id.nav_profile : temp=new Profile_Fragment();
                        break;
                    case R.id.nav_logout: temp=new Booking_Fragment();
                        break;

                }
                Log.d("cheking","sfd" +  item.getItemId());

                getSupportFragmentManager().beginTransaction().replace(R.id.main_container,temp).commit();



                return true;
            }
        });


    }





}

Step3:- Menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/nav_home" android:icon="@drawable/mainmenu"
    android:title="Home"/>

    <item android:id="@+id/nav_profile" android:title="Profile"
        android:icon="@drawable/mainmenu"/>
    <item android:id="@+id/nav_logout" android:icon="@drawable/mainmenu"
        android:title="Logout"/>


</menu>