src/main/res/xml/pref_vibrate.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
	<CheckBoxPreference
		android:key="enable_vibrate"
		android:title="@string/pref_title_enable_vibrate"
		android:defaultValue="false" />
	<ListPreference
	  android:dependency="enable_vibrate"
	  android:key="vibrate_time"
	  android:title="When"
	  android:entries="@array/when"
	  android:entryValues="@array/when"
	  android:defaultValue="Taken"
	/>
</PreferenceScreen>