NotificationShowcase/res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <LinearLayout android:id="@+id/linearLayout1" android:orientation="vertical" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_width="match_parent" android:layout_margin="35dp">
        <Button android:id="@+id/button1" android:text="@string/post_button_label" android:layout_height="wrap_content" android:layout_width="match_parent" android:onClick="doPost"></Button>
        <Button android:id="@+id/button2" android:text="@string/remove_button_label" android:layout_height="wrap_content" android:layout_width="match_parent" android:onClick="doRemove"></Button>
        <Button android:id="@+id/button3" android:text="@string/prefs_button_label" android:layout_height="wrap_content" android:layout_width="match_parent" android:onClick="doPrefs"></Button>
        <Button android:id="@+id/disable" android:text="@string/no_button_label" android:layout_height="wrap_content" android:layout_width="match_parent" android:onClick="doDisable"></Button>
    </LinearLayout>
</FrameLayout>