限制Android中的DatePicker条目

Question

我想根据FROM和TO日期限制datepicker条目。下面的代码工作得很好但在UI中，当禁用日期和不可点击时，可以选择禁用日期。

以下是代码：

if (v == fromDateButton || v == toDateButton) {
            final Calendar now = GregorianCalendar.getInstance();
            mYear = now.get(Calendar.YEAR);
            mMonth = now.get(Calendar.MONTH);
            mDay = now.get(Calendar.DAY_OF_MONTH);

            DatePickerDialog dpd = new DatePickerDialog(this,
                    new DatePickerDialog.OnDateSetListener() {

                        @Override
                        public void onDateSet(DatePicker view, int year,
                                              int monthOfYear, int dayOfMonth) {

                            String day = "", month = "";

                            monthOfYear = (monthOfYear + 1); // Calendar returns 1st month as 0

                            if (monthOfYear <= 9)
                                month = "0" + monthOfYear;
                            else month = monthOfYear + "";

                            if (dayOfMonth <= 9)
                                day = "0" + (dayOfMonth);
                            else day = (dayOfMonth) + "";

                            if (v == fromDateButton)
                                fromDateField.setText(day + "/"
                                        + month + "/" + year);

                            else toDateField.setText(day + "/"
                                    + month + "/" + year);


                            // Enable todate field
                            toDateButton.setEnabled(true);

                        }
                    }, mYear, mMonth, mDay);

            if (!toDateButton.isEnabled()) {
                dpd.getDatePicker().setMaxDate(new Date().getTime());
            }

            if (v == toDateButton) {
                // if (fromDateField.getText() != null && fromDateField.getText() != "") {

                DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
                Date date;
                try {
                    date = df.parse(fromDateField.getText().toString());
                    dpd.getDatePicker().setMinDate(date.getTime());
                    dpd.getDatePicker().setMaxDate(new Date().getTime());
                } catch (ParseException e) {
                    e.printStackTrace();
                }

                // }

            }

            if (v == fromDateButton) {
                // if (toDateField.getText() != null && toDateField.getText() != "") {

                DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
                Date date;
                try {
                    date = df.parse(toDateField.getText().toString());
                    dpd.getDatePicker().setMaxDate(date.getTime());
                } catch (ParseException e) {
                    e.printStackTrace();
                }
                // }
            }

            dpd.show();
        }

以下是可以从中选择禁用字段的选择器

知道为什么会这样吗？我只需要限制用户选择禁用日期。