code: private static String getStringResourceByName(Context ctx, String resourceName) {
          String packageName = ctx.getPackageName();
          int resId = ctx.getResources().getIdentifier(resourceName, "string", packageName);
          if (resId == 0) {
              return "";
          } else {
              return ctx.getString(resId);
          }
      }
docs: helper class to retrieve a string by it's resource name