code: protected FileParameter getFileParameter(String name) {
          if (activity.getRequestAdapter() != null) {
              return activity.getRequestAdapter().getFileParameter(name);
          } else {
              return null;
          }
      }
docs: Returns a {@code FileParameter} object as a given activity's request parameter name,
  or {@code null} if the parameter does not exist.
  
  @param name a {@code String} specifying the name of the parameter
  @return a {@code FileParameter} representing the
  single value of the parameter