Android : how to save two datepicker data

I tried to use the code that has been answer here

How can I create a custom dialog with two datepicker?

However, after i successfully call the 2 datepicker, i do not know how to enter my selected date to my text view. I tried to use

public void onDateSet(CustomViewCallback customView, int startYear, int startMonth, int startDay, int endYear, int endMonth,int endDay) {
    Datestart.setText(startYear+ startMonth+ startDay);
}

but it does not work, can anyone help me out?