Use the app icon for navigation in settings_page

In addition, set theme of settings_page and alarm_page to
Theme.Holo.Light.

Signed-off-by: John Hsing <tsyj2007@gmail.com>

AndroidManifest.xml

@@ -127,14 +127,14 @@
             android:name=".ui.AlarmAlertActivity"
             android:label="@string/app_name"
             android:launchMode="singleInstance"
-            android:theme="@android:style/Theme.Wallpaper.NoTitleBar" >
+            android:theme="@android:style/Theme.Holo.Wallpaper.NoTitleBar" >
         </activity>
 
         <activity
             android:name="net.micode.notes.ui.NotesPreferenceActivity"
             android:label="@string/preferences_title"
             android:launchMode="singleTop"
-            android:theme="@android:style/Theme.Light" >
+            android:theme="@android:style/Theme.Holo.Light" >
         </activity>
 
         <service

src/net/micode/notes/ui/NotesPreferenceActivity.java

@@ -18,6 +18,7 @@ package net.micode.notes.ui;
 
 import android.accounts.Account;
 import android.accounts.AccountManager;
+import android.app.ActionBar;
 import android.app.AlertDialog;
 import android.content.BroadcastReceiver;
 import android.content.ContentValues;
@@ -34,6 +35,7 @@ import android.preference.PreferenceCategory;
 import android.text.TextUtils;
 import android.text.format.DateFormat;
 import android.view.LayoutInflater;
+import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.Button;
@@ -70,6 +72,10 @@ public class NotesPreferenceActivity extends PreferenceActivity {
     @Override
     protected void onCreate(Bundle icicle) {
         super.onCreate(icicle);
+
+        /* using the app icon for navigation */
+        getActionBar().setDisplayHomeAsUpEnabled(true);
+
         addPreferencesFromResource(R.xml.preferences);
         mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);
         mReceiver = new GTaskReceiver();
@@ -371,7 +377,9 @@ public class NotesPreferenceActivity extends PreferenceActivity {
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
             case android.R.id.home:
-                finish();
+                Intent intent = new Intent(this, NotesListActivity.class);
+                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                startActivity(intent);
                 return true;
             default:
                 return false;