code: public void setMessage(CharSequence message){
          if(mConstruct != null && !mConstruct.getDesign().isMaterial()){
              TextView msgView = (TextView) getDialog().findViewById(R.id.message);
              msgView.setText(message);
          }else{
              if(mMessage != null){
                  mMessage.setText(message);
              }
          }
      }
docs: Modify the message of the dialog
  
  @param message       the message to update with