DatePicker.OnDateChangedListener called twice

When I test my application, method onDateSet called twice after accept the date selection and once when I canceled.

I added a validation in the method onDateSet with parameter view, something like this

@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth){
    if (view.isShown()) {
        updateDate(year, monthOfYear, dayOfMonth);
    }
}