如何将当前日期与日期选择器的用户输入日期进行比较

Question

我试图限制日期和时间.我希望如果用户尝试将日期设置为小于当前日期,那么它应该显示警报,同样的事情是按时完成.我使用的日期和时间选择和我onDateSetListener和onTimeSetListener情况如下:

DatePickerDialog.OnDateSetListener d = new DatePickerDialog.OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear,
                int dayOfMonth) {
            dateTime.set(Calendar.YEAR, year);
            dateTime.set(Calendar.MONTH, monthOfYear);
            dateTime.set(Calendar.DAY_OF_MONTH, dayOfMonth);
            update_date_display();



            // ---for setting notification----

            day = dayOfMonth;
            month = monthOfYear;
            AddEditTask.year = year;

            c.set(year, month, day);
        }
    };

    protected void update_date_display() {

        et_task_date.setText(formatDate.format(dateTime.getTime()));
    }

    TimePickerDialog.OnTimeSetListener t = new TimePickerDialog.OnTimeSetListener() {
        @Override
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {

            dateTime.set(Calendar.HOUR_OF_DAY, hourOfDay);
            dateTime.set(Calendar.MINUTE, minute);
            update_time_display();

            // ---for setting notification---

            hour = hourOfDay;
            AddEditTask.minute = minute;

            c.set(Calendar.HOUR_OF_DAY, hourOfDay);
            c.set(Calendar.MINUTE, minute);
            c.set(Calendar.SECOND, 0);
        }
    };

    private void update_time_display() {

        et_task_time.setText(formatTime.format(dateTime.getTime()));
    }

你能否告诉我在听众中写下什么才能达到我想要的目的.提前致谢...!!!

Answer 1

以这种方式创建一个新的Date对象:

Date now = new Date(System.currentTimeMillis());

并使用 int result = now.compareTo(theOtherDate);

如果现在Date小于theOtherDate Date,则结果为int <0;如果它们相等则为0,如果此Date更大,则结果为int> 0.