samples/SupportLeanbackShowcase/app/src/main/res/layout/activity_settings_example.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

    <fragment
        android:id="@+id/settingsFragment"
        android:name="android.support.v17.leanback.supportleanbackshowcase.SettingsExampleFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></fragment>
</RelativeLayout>