samples/Support4Demos/res/layout/accessibility_delegate.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">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/accessibility_delegate_instructions"/>

    <view class="com.example.android.supportv4.accessibility.AccessibilityDelegateSupportActivity$AccessibilityDelegateSupportView"
        android:layout_width="wrap_content"
        android:layout_height="50dip"
        android:layout_marginTop="50dip"
        android:background="@android:drawable/btn_default"/>

</LinearLayout>