Update polar clock settings to use new framework API.

Change-Id: Ib25ba85b4bec018652207eadaf6da2b9a8d9a58c
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 306a183..fdd3052 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -94,7 +94,7 @@
         <activity
             android:label="@string/clock_settings"
             android:name="com.android.wallpaper.polarclock.PolarClockSettings"
-            android:theme="@android:style/Theme.Wallpaper"
+            android:theme="@android:style/Theme.Light.WallpaperSettings"
             android:exported="true">
         </activity>
         
diff --git a/src/com/android/wallpaper/polarclock/PolarClockSettings.java b/src/com/android/wallpaper/polarclock/PolarClockSettings.java
index 4029b1a..77f75a4 100644
--- a/src/com/android/wallpaper/polarclock/PolarClockSettings.java
+++ b/src/com/android/wallpaper/polarclock/PolarClockSettings.java
@@ -20,26 +20,19 @@
 
 import android.content.SharedPreferences;
 import android.os.Bundle;
-import android.preference.CheckBoxPreference;
-import android.preference.PreferenceActivity;
+import android.service.wallpaper.WallpaperSettingsActivity;
 
-public class PolarClockSettings extends PreferenceActivity
+public class PolarClockSettings extends WallpaperSettingsActivity
     implements SharedPreferences.OnSharedPreferenceChangeListener {
 
-    private CheckBoxPreference mShowSeconds;
-    
     @Override
     protected void onCreate(Bundle icicle) {
         super.onCreate(icicle);
         getPreferenceManager().setSharedPreferencesName(
                 PolarClockWallpaper.SHARED_PREFS_NAME);
         addPreferencesFromResource(R.xml.polar_clock_prefs);
-        mShowSeconds = (CheckBoxPreference) findPreference(
-                PolarClockWallpaper.PREF_SHOW_SECONDS);
         getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(
                 this);
-        getWindow().setBackgroundDrawableResource(
-                android.R.drawable.screen_background_dark_transparent);
     }
 
     @Override