How set TextView value with sum of numeric ListView loaded from database

I have a Fragment composed by a ListView and a TextView. ListView contains several TextView with numeric values loaded from database via custom SimpleCursorAdapter and CursorLoader. So these values are static after displayed. I want to sum values and show directly the total in the separate TextView. How can i do it? I mean from user point of view the list and the total must be displayed at the same time. I can use an additional loader for getting the total separately but I want to avoid this. So in which point should I put sum logic?

Already checked other questions but I didn't find a solution for my case.

Here it is my code:

FRAGMENT onCreateView

public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.monthly_report, container, false);
        ListView listCosts = (ListView)rootView.findViewById(R.id.list_costs);
        costsAdapter = new VehReportAdapter(getActivity(), 
                    com.vortexalex.vehnotes.R.layout.monthly_report_single_item, null,
                    VehReportAdapter.fromColumns, toViews, 0);
        listCosts.setAdapter(costsAdapter);
}

FRAGMENT onActivityCreated

public void onActivityCreated(Bundle savedInstanceState) {
        getLoaderManager().initLoader(VehTabsUtil.REPORT_COSTS_LOADER_ID, null, (LoaderCallbacks<Cursor>) this); 
}

FRAGMENT onLoaderFinished

public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {  
    costsAdapter.swapCursor(cursor);
}

ADAPTER bindView (Adapter extends SimpleCursorAdapter)

public void bindView(View view, Context context, Cursor cursor) {
    Integer dbAmount = cursor.getInt(cursor.getColumnIndex(AccountingContract.Report.COLUMN_NAME_GROUP_AMOUNT));
    String amount = NumberUtil.formatAmount(dbAmount);
    ((TextView) view.findViewById(com.vortexalex.vehnotes.R.id.report_item_amount)).setText(amount);        

}

FRAGMENT LAYOUT montly_report.xml

<LinearLayout xmlns:android="http://ift.tt/nIICcg"
    xmlns:tools="http://ift.tt/LrGmb4"
    android:layout_width="match_parent"
    android:layout_height="?android:attr/listPreferredItemHeight"
    android:orientation="vertical"
    android:padding="6dip" >

    <ListView android:id="@+id/list_costs"
               android:layout_width="wrap_content"
               android:layout_height="0dip"
               android:layout_weight="2"
               android:drawSelectorOnTop="false"/>

    <TextView 
        android:id="@+id/costs_sum"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="start"
        android:padding="6dip"
     />
</LinearLayout>