samples/SupportLeanbackDemos/res/layout/custom_title.xml

<?xml version="1.0" encoding="utf-8"?>
<com.example.android.leanback.CustomTitleView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/browse_title_group"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <TextView
        android:text="@string/custom_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</com.example.android.leanback.CustomTitleView>