code: public void start(Fragment fragment) {
          Intent i = new Intent(fragment.getContext(), CalculatorActivity.class);
          if (!TextUtils.isEmpty(activityTitle)) {
              i.putExtra(CalculatorActivity.TITLE_ACTIVITY, activityTitle);
          }
  
          if (!TextUtils.isEmpty(value)) {
              i.putExtra(CalculatorActivity.VALUE, value);
          }
  
          fragment.startActivityForResult(i, CalculatorActivity.REQUEST_RESULT_SUCCESSFUL);
      }
docs: Start the activity using the parent fragment
  
  @param fragment the current fragment