Top level screen for App Fuel Gauge.

Shows sorted list of power usage (with some debug information) by the top 10
apps and subsystems. Doesn't yet take into account certain subsystems such
as data network usage, audio/video DSP usage, Bluetooth and lights other than
screen backlight.

Screen, Idle, Wifi and Voice usage and CPU time are accounted for.

Also need to add detail screens for each item and suggested actions.

res/layout/preference_powergauge.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2009 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.
+-->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="fill_parent"
+    android:layout_height="wrap_content"
+    android:minHeight="?android:attr/listPreferredItemHeight"
+    android:gravity="center_vertical"
+    android:paddingLeft="16dip"
+    android:id="@+android:id/widget_frame"
+    android:paddingRight="?android:attr/scrollbarSize">
+
+    <ImageView
+        android:id="@+id/appIcon"
+        android:layout_width="48dip"
+        android:layout_height="wrap_content"
+        android:layout_marginRight="6dip"
+        android:layout_gravity="center" />
+
+    <RelativeLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginRight="6dip"
+        android:layout_marginTop="6dip"
+        android:layout_marginBottom="6dip"
+        android:layout_weight="1">
+
+        <TextView android:id="@+android:id/title"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:singleLine="true"
+            android:visibility="gone"
+            android:textAppearance="?android:attr/textAppearanceLarge" />
+
+        <ImageView
+            android:id="@+id/appGauge"
+            android:layout_height="wrap_content"
+            android:layout_width="fill_parent"
+            android:layout_marginRight="6dip"
+            android:layout_gravity="center_vertical" />
+
+        <TextView android:id="@+android:id/summary"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_below="@id/appGauge"
+            android:layout_alignLeft="@id/appGauge"
+            android:textAppearance="?android:attr/textAppearanceSmall"
+            android:maxLines="2" />
+
+    </RelativeLayout>
+
+</LinearLayout>