SetMax date to 30 days in Android Date Picker

问题:

I'm using a Material design library for Datepicker. I need to set min and max date. The min date works but I am not able to get the max date which should be 30 days from the min date(current date). Can anyone know how to make it work here?

public void show() {
    Calendar now = Calendar.getInstance();
    DatePickerDialog dpd = DatePickerDialog.newInstance(
            PostInfo.this,
            now.get(Calendar.YEAR),
            now.get(Calendar.MONTH),
            now.get(Calendar.DAY_OF_MONTH)
    );
    dpd.setMinDate(Calendar.getInstance());

    Calendar calendar = Calendar.getInstance(); 
  calendar.add(Calendar.DAY_OF_MONTH, 30);   


    dpd.setMaxDate(calendar.getInstance());


    dpd.show(getFragmentManager(), "Datepickerdialog");

回答1:

You can use setMaxDate()

DatePickerDialog datePickerDialog = new DatePickerDialog(getActivity(), this, year, month, day);

Calendar calendar = Calendar.getInstance();  // this is default system date
                datePickerDialog.getDatePicker().setMinDate(calendar.getTimeInMillis());  //set min date                 // set today's date as min date
                calendar.add(Calendar.DAY_OF_MONTH, 30); // add date to 30 days later
                datePickerDialog.getDatePicker().setMaxDate(calendar.getTimeInMillis()); //set max date

回答2:

So this finally worked. All I had to do is call dpd.setMaxDate(now) instead of dpd.setMaxDate(now.getInstance())

public void show() {
        Calendar now = Calendar.getInstance();

        DatePickerDialog dpd = DatePickerDialog.newInstance(
                PostInfo.this,
                now.get(Calendar.YEAR),
                now.get(Calendar.MONTH),
                now.get(Calendar.DAY_OF_MONTH)
        );

        dpd.setMinDate(Calendar.getInstance());
        now.add(Calendar.DAY_OF_MONTH, 30);

        dpd.setMaxDate(now);

        dpd.show(getFragmentManager(), "Datepickerdialog");

 }