wallpaper_picker_res/layout/wallpaper_picker.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
/*
**
** Copyright 2013, 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.
*/
-->

<com.android.launcher3.WallpaperRootView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/wallpaper_root"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <com.android.launcher3.CropView
        android:id="@+id/cropView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    <ProgressBar
        android:id="@+id/loading"
        style="@android:style/Widget.Holo.ProgressBar.Large"
        android:visibility="invisible"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:indeterminate="true"
        android:indeterminateOnly="true"
        android:background="@android:color/transparent" />
    <LinearLayout
        android:id="@+id/wallpaper_strip"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="vertical" >
        <View
            android:layout_width="match_parent"
            android:layout_height="2dp"
            android:background="@drawable/tile_shadow_top" />
        <HorizontalScrollView
            android:id="@+id/wallpaper_scroll_container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >
            <LinearLayout android:id="@+id/master_wallpaper_list"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="horizontal" >
                <LinearLayout android:id="@+id/wallpaper_list"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal" />
                <LinearLayout android:id="@+id/live_wallpaper_list"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal" />
                <LinearLayout android:id="@+id/third_party_wallpaper_list"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal" />
            </LinearLayout>
        </HorizontalScrollView>
        <View
            android:layout_width="match_parent"
            android:layout_height="2dp"
            android:background="@drawable/tile_shadow_bottom" />
    </LinearLayout>
</com.android.launcher3.WallpaperRootView>