Bottom Navigation View

 

STEP 1: Create 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/ic_home_black_24dp"
        android:title="Home" />

    <item
        android:id="@+id/nav_db"
        android:icon="@drawable/ic_dashboard_black_24dp"
        android:title="Dashboard" />

    <item
        android:id="@+id/nav_noti"
        android:icon="@drawable/ic_notifications_black_24dp"
        android:title="Notification" />

</menu>

STEP 2: Main Activity (xml)

<?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/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/bottom_navigation" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="?android:attr/windowBackground"
        app:menu="@menu/navigation_menu" />

</RelativeLayout>


STEP 3: Main Activity (java)

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;

import android.os.Bundle;
import android.view.MenuItem;
import android.widget.FrameLayout;

import com.google.android.material.bottomnavigation.BottomNavigationView;

public class MainActivity extends AppCompatActivity {

    private FrameLayout fragment_container;
    private BottomNavigationView bottom_navigation;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        fragment_container = findViewById(R.id.fragment_container);
        bottom_navigation = findViewById(R.id.bottom_navigation);

        bottom_navigation.setOnNavigationItemSelectedListener(nav_listener);

        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new HomeFragment()).commit();
        //app start thay tyare direct je fragment show karavavu hoy te mate...

    }

    private BottomNavigationView.OnNavigationItemSelectedListener nav_listener =
            new BottomNavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(@NonNull MenuItem item) {

                    Fragment selectedFragment = null;

                    switch (item.getItemId()) {

                        case R.id.nav_home:
                            selectedFragment = new HomeFragment();
                            break;

                        case R.id.nav_db:
                            selectedFragment = new DashboardFragment();
                            break;

                        case R.id.nav_noti:
                            selectedFragment = new NotificationFragment();
                            break;
                    }

                    getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, selectedFragment).commit();
                    return true;
                }
            };
}