public static String actionUrl(String specialUrl) {
   if (specialUrl.startsWith("http://m.mit.edu/open-house")) {
     OpenHouseCategory category = getOpenHouseCategory(specialUrl);
     if (category != null) {
       try {
         return "mitmobile://calendar/category?listID=OpenHouse"
             + "&catID="
             + category.getCatID()
             + "&title="
             + URLEncoder.encode(category.getTitle(), "UTF-8");
       } catch (UnsupportedEncodingException e) {
         e.printStackTrace();
         return null;
       }
     }
     ;
     return "mitmobile://calendar/category?listID=OpenHouse";
   }
   return null;
 }