Add an icon to the left of the settings at the top level.

Add a new attribute for the icon.
Add place holder icons.

res/layout/preference_icon.xml

@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2006 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.
+-->
+
+<!-- Layout for a Preference in a PreferenceActivity. The
+     Preference is able to place a specific widget for its particular
+     type in the "widget_frame" layout. -->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+android:id/widget_frame"
+    android:layout_width="fill_parent"
+    android:layout_height="wrap_content"
+    android:minHeight="?android:attr/listPreferredItemHeight"
+    android:gravity="center_vertical"
+    android:paddingRight="?android:attr/scrollbarSize">
+    
+    <ImageView
+        android:id="@+id/icon"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginLeft="12dip"
+        android:layout_marginRight="6dip"
+        android:layout_gravity="center" />
+
+    <RelativeLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginLeft="6dip"
+        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:textAppearance="?android:attr/textAppearanceLarge"
+            android:ellipsize="marquee"
+            android:fadingEdge="horizontal" />
+            
+        <TextView android:id="@+android:id/summary"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_below="@android:id/title"
+            android:layout_alignLeft="@android:id/title"
+            android:textAppearance="?android:attr/textAppearanceSmall"
+            android:maxLines="2" />
+
+    </RelativeLayout>
+    
+</LinearLayout>

res/values/attrs.xml

@@ -18,4 +18,7 @@
     <declare-styleable name="WifiEncryptionState">
         <attr name="state_encrypted" format="boolean" />
     </declare-styleable>
+    <declare-styleable name="IconPreferenceScreen">
+        <attr name="icon" format="reference" />
+    </declare-styleable>
 </resources>

res/xml/settings.xml

@@ -16,64 +16,71 @@
 
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"
     android:title="@string/settings_label"
     android:key="parent">
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
             android:title="@string/radio_controls_title"
+            settings:icon="@drawable/ic_settings_wireless"
             android:summary="@string/radio_controls_summary">
             <intent
                 android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.settings"
                 android:targetClass="com.android.settings.WirelessSettings" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
             android:key="call_settings"
+            settings:icon="@drawable/ic_settings_call"
             android:title="@string/call_settings_title"
             android:summary="@string/call_settings_summary">
             <intent
                 android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.phone"
                 android:targetClass="com.android.phone.CallFeaturesSetting" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- Sound and Display -->
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
+            settings:icon="@drawable/ic_settings_sound_display"
             android:title="@string/sound_and_display_settings"
             android:summary="@string/sound_and_display_settings_summary">
             <intent
                 android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.settings"
                 android:targetClass="com.android.settings.SoundAndDisplaySettings" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- Data Sync. The settings activity will ensure this is resolved to an
              activity on the system image, otherwise it will remove this
              preference. -->
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
+            settings:icon="@drawable/ic_settings_sync"
             android:title="@string/sync_settings"
             android:summary="@string/sync_settings_summary"
             android:key="sync_settings">
             <intent android:action="android.settings.SYNC_SETTINGS" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- Security & Privacy -->
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
+            settings:icon="@drawable/ic_settings_security"
             android:title="@string/security_settings_title"
             android:summary="@string/security_settings_summary">
             <intent
                 android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.settings"
                 android:targetClass="com.android.settings.SecuritySettings" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- Application Settings -->
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
+            settings:icon="@drawable/ic_settings_applications"
             android:title="@string/applications_settings"
             android:summary="@string/applications_settings_summary"
             android:key="applications_settings">
@@ -81,39 +88,42 @@
                 android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.settings"
                 android:targetClass="com.android.settings.ApplicationSettings" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- Storage -->
 
-        <PreferenceScreen 
+        <com.android.settings.IconPreferenceScreen 
+            settings:icon="@drawable/ic_settings_storage"
             android:title="@string/storage_settings_title" 
             android:summary="@string/storage_settings_summary">
             <intent android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.settings"
                 android:targetClass="com.android.settings.deviceinfo.Memory" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- Date & Time -->
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
+            settings:icon="@drawable/ic_settings_date_time"
             android:title="@string/date_and_time_settings_title"
             android:summary="@string/date_and_time_settings_summary">
             <intent
                 android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.settings"
                 android:targetClass="com.android.settings.DateTimeSettings" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- Language -->
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
+            settings:icon="@drawable/ic_settings_language"
             android:title="@string/language_settings"
             android:summary="@string/language_settings_summary">
             <intent
                 android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.settings"
                 android:targetClass="com.android.settings.LanguageSettings" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- Search. 
              The settings activity will ensure that this is resolved to an
@@ -123,44 +133,48 @@
              android.app.SearchManager.INTENT_ACTION_SEARCH_SETTINGS.
              -->
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
+            settings:icon="@drawable/ic_settings_search"
             android:title="@string/search_settings"
             android:summary="@string/search_settings_summary"
             android:key="search_settings">
             <intent android:action="android.search.action.SEARCH_SETTINGS" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- Accessibility feedback -->
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
+            settings:icon="@drawable/ic_settings_accessibility"
             android:title="@string/accessibility_settings_title"
             android:summary="@string/accessibility_settings_summary">
             <intent
                 android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.settings"
                 android:targetClass="com.android.settings.AccessibilitySettings" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- Text-To-Speech -->
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
+            settings:icon="@drawable/ic_settings_speech"
             android:title="@string/tts_settings"
             android:summary="@string/tts_settings_summary">
             <intent
                 android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.settings"
                 android:targetClass="com.android.settings.TextToSpeechSettings" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
         <!-- About Device -->
 
-        <PreferenceScreen
+        <com.android.settings.IconPreferenceScreen
+            settings:icon="@drawable/ic_settings_about"
             android:title="@string/about_settings"
             android:summary="@string/about_settings_summary">
             <intent
                 android:action="android.intent.action.MAIN"
                 android:targetPackage="com.android.settings"
                 android:targetClass="com.android.settings.DeviceInfoSettings" />
-        </PreferenceScreen>
+        </com.android.settings.IconPreferenceScreen>
 
 </PreferenceScreen>

src/com/android/settings/IconPreferenceScreen.java

@@ -0,0 +1,51 @@
+/*
+ * 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.
+ */
+
+package com.android.settings;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.drawable.Drawable;
+import android.preference.Preference;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.ImageView;
+
+public class IconPreferenceScreen extends Preference {
+
+    private Drawable mIcon;
+
+    public IconPreferenceScreen(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public IconPreferenceScreen(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        setLayoutResource(R.layout.preference_icon);
+        TypedArray a = context.obtainStyledAttributes(attrs,
+                R.styleable.IconPreferenceScreen, defStyle, 0);
+        mIcon = a.getDrawable(R.styleable.IconPreferenceScreen_icon);
+    }
+
+    @Override
+    public void onBindView(View view) {
+        super.onBindView(view);
+        ImageView imageView = (ImageView) view.findViewById(R.id.icon);
+        if (imageView != null && mIcon != null) {
+            imageView.setImageDrawable(mIcon);
+        }
+    }
+}