Restore ad placeholder container in main layout

Author: MihaiCristianCondrea

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

@@ -24,7 +24,7 @@
         android:id="@+id/nav_rail"
         android:layout_width="wrap_content"
         android:layout_height="0dp"
-        app:layout_constraintBottom_toTopOf="@+id/ad_view"
+        app:layout_constraintBottom_toTopOf="@+id/ad_container"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/app_bar_layout"
         app:menu="@menu/bottom_nav_menu" />
@@ -35,20 +35,32 @@
         android:layout_width="0dp"
         android:layout_height="0dp"
         app:defaultNavHost="true"
-        app:layout_constraintBottom_toTopOf="@+id/ad_view"
+        app:layout_constraintBottom_toTopOf="@+id/ad_container"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toEndOf="@id/nav_rail"
         app:layout_constraintTop_toBottomOf="@id/app_bar_layout"
         app:navGraph="@navigation/mobile_navigation" />
 
-    <com.d4rk.androidtutorials.java.ads.views.NativeAdBannerView
-        android:id="@+id/ad_view"
+    <FrameLayout
+        android:id="@+id/ad_container"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         app:layout_constraintBottom_toTopOf="@+id/nav_view"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:nativeAdLayout="@layout/ad_bottom_app_bar" />
+        app:layout_constraintStart_toStartOf="parent">
+
+        <View
+            android:id="@+id/ad_placeholder"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:background="?attr/colorSurfaceContainer" />
+
+        <com.d4rk.androidtutorials.java.ads.views.NativeAdBannerView
+            android:id="@+id/ad_view"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:nativeAdLayout="@layout/ad_bottom_app_bar" />
+    </FrameLayout>
 
     <com.google.android.material.bottomnavigation.BottomNavigationView
         android:id="@+id/nav_view"
@@ -66,4 +78,4 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
-</androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>