NotificationShowcase/res/layout/full_screen.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <ImageView android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="vertical"
        android:layout_weight="1"
        android:src="@drawable/page_hed"
        android:onClick="dismiss"
        />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:text="@string/hang_up_button_label"
        android:onClick="dismiss"
        android:layout_weight="0"
        />

</LinearLayout>