datePicker nur Daten in Zukunft wählbar machen

public void datePicker(View view){
        OneWayActivity.DatePickerFragment fragment = new OneWayActivity.DatePickerFragment();
        fragment.show(getSupportFragmentManager(), "date");
    }




    private void setDate(final Calendar calendar) {
        String daysArray[] = {"Sunday","Monday","Tuesday", "Wednesday","Thursday","Friday", "Saturday"};
        int day = calendar.get(Calendar.DAY_OF_WEEK);
        String selectedDay = daysArray[day-1];
        final DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.MEDIUM);
        ((TextView) findViewById(R.id.tvDate)).setText(dateFormat.format(calendar.getTime()));
        ((TextView) findViewById(R.id.tvDay)).setText(selectedDay);
    }


    @Override
    public void onDateSet(DatePicker view, int year, int month, int day) {
        Calendar calendar = new GregorianCalendar(year,month,day);


        setDate(calendar);
    }


    public static class DatePickerFragment extends DialogFragment {
        @NonNull
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            final Calendar calendar = Calendar.getInstance();
            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH);
            int day = calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH);


            return new DatePickerDialog(getActivity(), (DatePickerDialog.OnDateSetListener) getActivity(),year,month,day);


        }
    }

public static class DatePickerFragment extends DialogFragment {


        @NonNull
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            final Calendar calendar = Calendar.getInstance();
            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH);
            int day = calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH);
            Long currentTimeInMs = System.currentTimeMillis();
            DatePickerDialog datePickerDialog = new DatePickerDialog(getActivity(), (DatePickerDialog.OnDateSetListener) getActivity(), year, month, day);
            DatePicker dp = datePickerDialog.getDatePicker();
            dp.setMinDate(currentTimeInMs);
            return datePickerDialog;
        }
    }