@SuppressWarnings("unchecked") public UrlCritter addUrl(String url,Context context){
  List<String> urls=urlManager.getUrls(context);
  if (!urls.contains(url)) {
    urls.add(url);
    urlManager.saveUrls(context,urls);
  }
  return this;
}

@ SuppressWarnings ( "unchecked" ) public UrlCritter addUrl ( String url , Context context ) { List < String > urls = urlManager . getUrls ( context ) ; if ( ! urls . contains ( url ) ) { urls . add ( url ) ; urlManager . saveUrls ( context , urls ) ; } return this ; }
adds a url to the singleton list of url data .
