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

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

    <LinearLayout
        android:id="@+id/container"
        android:layout_width="96dp"
        android:layout_height="96dp"
        android:background="@drawable/icon_focused_selector"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/main_image"
            android:layout_width="64dp"
            android:layout_height="64dp"
            android:layout_marginLeft="16dp"
            android:layout_marginTop="16dp"/>
    </LinearLayout>
</FrameLayout>