code: public boolean isExistingID() {
          try {
              String userId= getPost().getString(Defines.Jsonkey.Identity.getKey());
              return (userId != null && userId.equals(prefHelper_.getIdentity()));
          } catch (JSONException e) {
              e.printStackTrace();
              return false;
          }
  
      }
docs: Return true if the user id provided for user identification is the same as existing id
  
  @return True if the user id refferes to the existing user