res/xml/lockscreen_settings.xml

<?xml version="1.0" encoding="utf-8"?>
<!--  Copyright (C) 2015 The OmniROM Project

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 -->
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:settings="http://schemas.android.com/apk/res/com.android.settings">

    <PreferenceCategory
        android:key="lockscreen_wallpaper"
        android:title="@string/lockscreen_wallpaper_title" >

        <Preference
            android:key="lockscreen_wallpaper_set"
            android:title="@string/lockscreen_wallpaper_set_title"
            android:persistent="false"/>

        <Preference
            android:key="lockscreen_wallpaper_clear"
            android:title="@string/lockscreen_wallpaper_clear_title"
            android:persistent="false"/>

    </PreferenceCategory>
</PreferenceScreen>