Fix bug #12910775 Settings crash after tap on Access Point Names under Mobile networks

- ApnSettings is now a fragment so introduce a new ApnSettingsActivity
- ApsSettingsActivity will use the ApnSettings fragment
- move the getListView() call to onActivityCreated(...) as the ListView
needs to be created before this call can be done.
- add also an alias for the old activity name ".ApsSettings"

Change-Id: Id228722d7f34415d4b036282f0845e28546111df

src/com/android/settings/ApnSettings.java

@@ -120,12 +120,18 @@ public class ApnSettings extends SettingsPreferenceFragment implements
         super.onCreate(icicle);
 
         addPreferencesFromResource(R.xml.apn_settings);
-        getListView().setItemsCanFocus(true);
 
         mMobileStateFilter = new IntentFilter(
                 TelephonyIntents.ACTION_ANY_DATA_CONNECTION_STATE_CHANGED);
     }
 
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+
+        getListView().setItemsCanFocus(true);
+    }
+
     @Override
     public void onResume() {
         super.onResume();