samples/ApiDemos/res/layout/incoming_message_interstitial.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2012 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
  
          http://www.apache.org/licenses/LICENSE-2.0
  
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="8dp">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:paddingBottom="4dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="This would be where you would see a summary of the information related to the notification.  Instead, we'll just give you a button." />

    <Button
        android:id="@+id/notify_app"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Switch To App" />

</LinearLayout>