diff --git a/admob/app/src/main/res/layout/activity_main.xml b/admob/app/src/main/res/layout/activity_main.xml
index f7b98577d..a19bae84e 100644
--- a/admob/app/src/main/res/layout/activity_main.xml
+++ b/admob/app/src/main/res/layout/activity_main.xml
@@ -1,29 +1,32 @@
 <!-- [SNIPPET define_ad_layout]
 Define the namespace and AdView layout that will show the banner.
 [START define_ad_layout] -->
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:ads="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:paddingBottom="@dimen/activity_vertical_margin"
-    android:paddingLeft="@dimen/activity_horizontal_margin"
-    android:paddingRight="@dimen/activity_horizontal_margin"
-    android:paddingTop="@dimen/activity_vertical_margin"
     tools:context=".java.MainActivity">
 
     <ImageView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_centerHorizontal="true"
-        android:src="@drawable/firebase_lockup_400"/>
+        android:layout_marginTop="16dp"
+        android:src="@drawable/firebase_lockup_400"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
 
     <Button
         android:id="@+id/loadInterstitialButton"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_centerInParent="true"
-        android:text="@string/interstitial_button_text" />
+        android:text="@string/interstitial_button_text"
+        app:layout_constraintBottom_toTopOf="@+id/guideline"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="@+id/guideline" />
 
     <com.google.android.gms.ads.AdView
         android:id="@+id/adView"
@@ -32,6 +35,16 @@ Define the namespace and AdView layout that will show the banner.
         android:layout_alignParentBottom="true"
         android:layout_centerHorizontal="true"
         ads:adSize="BANNER"
-        ads:adUnitId="@string/banner_ad_unit_id" />
+        ads:adUnitId="@string/banner_ad_unit_id"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <androidx.constraintlayout.widget.Guideline
+        android:id="@+id/guideline"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        app:layout_constraintGuide_percent="0.5" />
 
-</RelativeLayout><!-- [END define_ad_layout] -->
+</androidx.constraintlayout.widget.ConstraintLayout><!-- [END define_ad_layout] -->
diff --git a/admob/app/src/main/res/layout/second_activity.xml b/admob/app/src/main/res/layout/second_activity.xml
index 3503d8916..71c2a329d 100644
--- a/admob/app/src/main/res/layout/second_activity.xml
+++ b/admob/app/src/main/res/layout/second_activity.xml
@@ -1,26 +1,37 @@
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout 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"
-    android:paddingBottom="@dimen/activity_vertical_margin"
-    android:paddingLeft="@dimen/activity_horizontal_margin"
-    android:paddingRight="@dimen/activity_horizontal_margin"
-    android:paddingTop="@dimen/activity_vertical_margin"
-    tools:viewBindingIgnore="true"
-    tools:context="com.google.samples.quickstart.admobexample.java.SecondActivity">
+    tools:context="com.google.samples.quickstart.admobexample.java.SecondActivity"
+    tools:viewBindingIgnore="true">
 
     <ImageView
         android:id="@+id/icon"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_centerHorizontal="true"
-        android:src="@drawable/firebase_lockup_400" />
+        android:src="@drawable/firebase_lockup_400"
+        app:layout_constraintBottom_toTopOf="@+id/guideline"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent" />
 
     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@+id/icon"
-        android:layout_centerHorizontal="true"
-        android:text="@string/second_activity_content" />
+        android:layout_gravity="center_horizontal"
+        android:text="@string/second_activity_content"
+        android:textAlignment="center"
+        app:layout_constraintEnd_toEndOf="@+id/icon"
+        app:layout_constraintStart_toStartOf="@+id/icon"
+        app:layout_constraintTop_toBottomOf="@+id/icon" />
+
+    <androidx.constraintlayout.widget.Guideline
+        android:id="@+id/guideline"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        app:layout_constraintGuide_percent="0.5" />
 
-</RelativeLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>