code: @Nullable
      protected View getEmailLabel() {
          final String emailPrompt = dialogConfiguration.emailPrompt();
          if (emailPrompt != null) {
              final TextView labelView = new TextView(this);
              labelView.setText(emailPrompt);
              return labelView;
          }
          return null;
      }
docs: creates a email label view with resEmailPrompt as text
  
  @return the label or null if there is no resource