android - 如何防止在 DatePickerDialog 中选择通过日期(setMinDate 无法按预期工作)

Question

我发现 DatePicker(Dialog) 非常困惑......当设置了 setMinDate() 时...显示的日历确实“视觉上禁用”了通过的日期(使它们变成灰色)但是这些日期仍然可以选择!我想阻止用户这样做。理想的方法是使通过的日期不可点击/不可选择。如果不可能，至少要捕获此事件(哪个？onDateChanged？、onSelected？...)并 toast 消息并禁用“确定”按钮，直到用户选择有效日期。

不幸的是，datepicker(dialog) 没有 onChangedListener(实际上它有但没有 setter )。所以我得到的唯一事件是按下 OK 按钮。太晚了。

这是我的代码

    dateTextView = (TextView) view.findViewById(R.id.createOrder_date);
    dateTextView.setText(R.string.createOrder_time_now);
    dateTextView.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            final Calendar calendarNow = Calendar.getInstance();
            final int yearNow = calendarNow.get(Calendar.YEAR);
            final int monthNow = calendarNow.get(Calendar.MONTH);
            final int dayNow = calendarNow.get(Calendar.DAY_OF_MONTH);

            DatePickerDialog datePickerDialog = new DatePickerDialog(CreateOrderFragment.this.getActivity(), new DatePickerDialog.OnDateSetListener() {
                @Override
                public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                    Calendar calendar = Calendar.getInstance();
                    calendar.set(year, monthOfYear, dayOfMonth);

                    if (calendar.before(calendarNow)) {
                        Toast.makeText(CreateOrderFragment.this.getActivity(), getResources().getString(R.string.createOrder_datePicker_selectFutureDate), Toast.LENGTH_SHORT).show();
                        view.updateDate(yearNow, monthNow, dayNow);
                        calendar = calendarNow;
                    }

                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                    dateTextView.setText(sdf.format(calendar.getTime()));
                }
            }, yearNow, monthNow, dayNow);

            datePickerDialog.getDatePicker().setMinDate(System.currentTimeMillis() - 1000);
            datePickerDialog.setTitle(getResources().getString(R.string.createOrder_datePicker_title));
            datePickerDialog.show();

        }
    });

Answer 1

当您在 onDateSent() 中收到日期时，只需检查它是否早于您在 setMinDate() 中设置的日期。如果是，则再次显示 DatePickerDialog。

代码:

final long tomorrow = System.currentTimeMillis() + DateUtils.MILLIS_IN_DAY;

private void showDatePickerDialog()
{
    mDatePickerDialog = new DatePickerDialog(getActivity(), new DatePickerDialog.OnDateSetListener()
    {
        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
        {
            Calendar calendar = Calendar.getInstance();
            calendar.set(year, monthOfYear, dayOfMonth);

            //kv If user tries to select date in past (or today)
            if (calendar.getTimeInMillis() < tomorrow)
            {
                //kv Make them try again
                showDatePickerDialog();

                Toast.makeText(this, "Invalid date, please try again", Toast.LENGTH_LONG).show();
            }
            else
            {
                //success
            }
        }
    }, calendarTwoWeeksInFuture.get(Calendar.YEAR), calendarTwoWeeksInFuture.get(Calendar.MONTH), calendarTwoWeeksInFuture.get(Calendar.DAY_OF_MONTH));

    //kv Set minimum date as tomorrow
    mDatePickerDialog.getDatePicker().setMinDate(tomorrow);

    mDatePickerDialog.show();
}