Refactor: Update BottomNavigationView and fix layout constraints

Author: MihaiCristianCondrea

app/src/main/res/layout/activity_main.xml

@@ -26,7 +26,7 @@
         android:visibility="gone"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/app_bar_layout"
-        app:layout_constraintBottom_toTopOf="@id/ad_view"
+        app:layout_constraintBottom_toTopOf="@+id/ad_view"
         app:menu="@menu/bottom_nav_menu" />
 
     <androidx.fragment.app.FragmentContainerView
@@ -37,7 +37,7 @@
         app:defaultNavHost="true"
         app:layout_constraintStart_toEndOf="@id/nav_rail"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintBottom_toTopOf="@id/ad_view"
+        app:layout_constraintBottom_toTopOf="@+id/ad_view"
         app:layout_constraintTop_toBottomOf="@id/app_bar_layout"
         app:navGraph="@navigation/mobile_navigation" />
 
@@ -47,9 +47,9 @@
         android:layout_height="wrap_content"
         app:adSize="FULL_BANNER"
         app:adUnitId="@string/ad_banner_unit_id"
-        app:layout_constraintBottom_toTopOf="@id/nav_view" />
+        app:layout_constraintBottom_toTopOf="@+id/nav_view" />
 
-    <com.google.android.material.navigation.NavigationBarView
+    <com.google.android.material.bottomnavigation.BottomNavigationView
         android:id="@+id/nav_view"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"