<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:adk2012="http://schemas.android.com/apk/res/com.google.android.apps.adk2" >

    <com.google.android.apps.adk2.widget.SeekBarPreference
        adk2012:max="255"
        android:key="brightness" />

</PreferenceScreen>