////In Main Activity
val binding = ActivityMainBinding.inflate(layoutInflater) val navView: BottomNavigationView = binding.navView setContentView(binding.root)
////////////////////	////////////////////
//// In Main_Activity_Layout
<com.google.android.material.bottomnavigation.BottomNavigationView android:id="@+id/nav_view" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_marginStart="0dp" android:layout_marginEnd="0dp" android:background="?android:attr/windowBackground" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:menu="@menu/bottom_nav_menu" />
//////////////////// ////////////////////
////////// Make Project Menu and create a layout file with name bottom_nav_menu///
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/navigation_home_frag" android:icon="@drawable/ic_home_black_24dp" android:title="@string/home"/> <item android:id="@+id/navigation_recent" android:icon="@drawable/ic_baseline_preview_24" android:title="@string/recent" /> <item android:id="@+id/navigation_favourite" android:icon="@drawable/ic_baseline_favorite_24" android:title="@string/favourite" />
</menu>
////////////////////	////////////////////