Minor UI tweakings

* Changed PreferenceScreen to Preference.

* Adjusted the "No recent app" message layout.

* No "Location services" category when empty.

* Removed "Under Construction" finally, hooray!

Change-Id: I83fd1d7a1b0235ad21b3a5c54542e937b60b3940

res/layout/location_list_no_item.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 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.
+-->
+
+<!-- text that appears when the recent app list is empty -->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:minHeight="?android:attr/listPreferredItemHeight"
+    android:gravity="center_vertical"
+    android:paddingEnd="?android:attr/scrollbarSize"
+    android:background="?android:attr/selectableItemBackground" >
+
+    <RelativeLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_marginStart="15dip"
+        android:layout_marginEnd="6dip"
+        android:layout_marginTop="6dip"
+        android:layout_marginBottom="6dip"
+        android:layout_weight="1">
+
+        <TextView android:id="@+android:id/title"
+            android:gravity="center"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:singleLine="true"
+            android:textAppearance="?android:attr/textAppearanceSmall"
+            android:ellipsize="marquee"
+            android:fadingEdge="horizontal" />
+
+    </RelativeLayout>
+
+</LinearLayout>
+