res/layout/wallpaper_chooser.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
/*
**
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
-->

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:background="@drawable/wallpaper_gallery_background">

        <Gallery android:id="@+id/gallery"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:spacing="-4dp" />
            
        <Button android:id="@+id/set"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/wallpaper_instructions"
            android:layout_gravity="center_horizontal" />
    </LinearLayout>
</RelativeLayout>