Date picker dialog date validation

Question

I would like to implement the following behaviour:

• When today's date is less than 15, 1-15 date is enabled in date Picker
• When today's date is greater than 15, 16-31 date is enabled in date picker

My code is:

private void DateDialog() {
    final DatePickerDialog dpDialog = new DatePickerDialog(this,android.app.AlertDialog.THEME_DEVICE_DEFAULT_DARK,new DatePickerDialog.OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker datePicker, int i, int i1, int i2) {
            cal = Calendar.getInstance();
            cal.setTimeInMillis(System.currentTimeMillis());
            //int curyear = cal.get(Calendar.YEAR);
            cal.set(i, i1, i2);
            etsubmstartdate.setText(dateformatter.format(cal.getTime()));
            selecteddate = dateformatter.format(cal.getTime());
            Log.e("Date of first edit text",selecteddate);
            etsubmstartdate.setText(selecteddate);
        }
    }, year, month, day);
    if (System.currentTimeMillis()<=15)
    {
        dpDialog.getDatePicker().setMinDate(System.currentTimeMillis() - 1000);
        long now = System.currentTimeMillis() - 1000;
        dpDialog.getDatePicker().setMaxDate(now+(1000*60*60*24*15));
        dpDialog.show();
    }
    else if(System.currentTimeMillis()>=15)
    {
        dpDialog.getDatePicker().setMinDate(System.currentTimeMillis() - 1000*60*60*24*2);
        long now = System.currentTimeMillis() - 1000*60*60*24*2;
        dpDialog.getDatePicker().setMaxDate(now+(1000*60*60*24*14));
        dpDialog.show();
    }
}

Answer 1

You can use .before and .after methods of Date class.

For example,

if (currentDate.before(yourdate)) {

//write your code require to before current date
}

if (currentDate.after(yourdate)) {

//write your code require to after current date
}

As per your code please replace below code in DateDialog() method

private void DateDialog() {

 final DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {

                    @Override
                    public void onDateSet(DatePicker view, int year, int monthOfYear,
                                          int dayOfMonth) {
                        // TODO Auto-generated method stub
                        myCalendar.set(Calendar.YEAR, year);
                        myCalendar.set(Calendar.MONTH, monthOfYear);
                        myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
                        updateLabel();
                    }

                };

                DatePickerDialog dpDialog = new DatePickerDialog(MainActivity.this, date, myCalendar
                        .get(Calendar.YEAR), myCalendar.get(Calendar.MONTH),
                        myCalendar.get(Calendar.DAY_OF_MONTH));

                Toast.makeText(MainActivity.this, "date::"+myCalendar.getTimeInMillis(), Toast.LENGTH_SHORT).show();

                String dt = "2018-04-15";
                String dtSixteen = "2018-04-16";

                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
                try {
                    Date dateFifteen = format.parse(dt);
                    Calendar calFifteen = Calendar.getInstance();
                    calFifteen.setTime(dateFifteen);

                    Date dateSixteen = format.parse(dtSixteen);
                    Calendar calSixteen = Calendar.getInstance();
                    calSixteen.setTime(dateSixteen);


                    Date currentDate = myCalendar.getTime();
                    Calendar calendar = Calendar.getInstance();

                    calendar.setTime( myCalendar.getTime() );
                    calendar.set(Calendar.HOUR_OF_DAY, 0);
                    calendar.set(Calendar.MINUTE, 0);
                    calendar.set(Calendar.SECOND, 0);
                    calendar.set(Calendar.MILLISECOND, 0);

                    currentDate = calendar.getTime();


                    if(currentDate.before(dateFifteen) || currentDate.equals(dateFifteen)){
                        dpDialog.getDatePicker().setMaxDate(calFifteen.getTimeInMillis());
                    }else {
                         dpDialog.getDatePicker().setMinDate(calSixteen.getTimeInMillis());
                    }

                } catch (ParseException e) {
                    e.printStackTrace();
                }

                dpDialog.show();

}