childData

private List<ArrayList<HashMap<String, String>>> childData() {

        ArrayList<ArrayList<HashMap<String, String>>> listData = new ArrayList<ArrayList<HashMap<String, String>>>();
        for (int i = 0; i < 10; i++) {
            ArrayList<HashMap<String, String>> childData = new ArrayList<HashMap<String, String>>();
            for (int n = 0; n < 3; n++) {
                HashMap<String, String> hashData = new HashMap<String, String>();
                hashData.put("Sub Item", "Sub Item " + n);
                childData.add( hashData );
            }
            listData.add( childData );
        }
        return listData;
    }