Avoiding picking up future dates in Calendar Codename One - codenameone

Question

I have a Calendar, so I can get dates by:
Calendar cld = new Calendar();
cld.getCurrentDate();
also:
cld.getDate();
So I have the current date and the date which I chose in the Calendar. What I'm trying to do is like:
Date currentdate = cld.getCurrentDate();
Date chosendate = cld.getDate();
long math = Math.abs(currentdate.getTime() - chosendate.getTime());
long result = math / (24 * 60 * 60 * 1000);
if(result < 0)Dialog.show("Invalid Date", "Please select a valid date.", "OK", null);
Not sure if my method is correct, actually I wanna a method to avoid picking up future dates from the Calendar, how to do that in Codename One?
EDITED:
Calendar cld = new Calendar() {
protected void updateButtonDayDate(Component dayButton, int year, int currentMonth, int day) {
super.updateButtonDayDate(dayButton, year, currentMonth, currentDay);
dayButton.setEnabled(isDateValid(year, currentMonth, day));
}
};
My isDateValid() method:
import java.util.Calendar;
public class DateValidator {
public boolean isDateValid(int year, int currentMonth, int day) {
if(Calendar.MONTH < currentMonth-1)return false;
else {
return true;
}
}
}
I had to create a new class since I was already using the Calendar from Codename One in my other Class, and it doesn't provide Calendar.MONTH. I can't pick up future months, but it still allow me to pick up future days and future years. I wish I could use the method Date.after() from the original java.util.Date, the Date from Codename One doesn't have the method after() which is making it difficult for me to find out a way. Any help?

Answer 1

You can derive Calendar and provide that logic yourself:
Calendar cld = new Calendar() {
protected void updateButtonDayDate(Component dayButton, int year, int currentMonth, int day) {
super.updateButtonDayDate(dayButton, year, currentMonth, currentDay);
dayButton.setEnabled(isDateValid(year, currentMonth, day));
}
};
The isDateValid() can be anything in this case only past dates:
private boolean isDateValid(int year, int currentMonth, int day) {
java.util.Calendar cld = java.util.Calendar.getInstance();
cld.set(java.util.Calendar.YEAR, year);
cld.set(java.util.Calendar.MONTH, currentMonth);
cld.set(java.util.Calendar.DAY_OF_MONTH, day);
return cld.getTime().getTime() < System.currentTimeMillis();
}