如何比较当前日期与日期选取器用户输入日期 [英] how do i compare current date with user input date from date picker

问题描述

我想保持约束的日期和时间。我想，如果用户试图设置日期小于当前日期，然后它应该显示警报，同样的事情是要与时间进行。我使用的日期和时间选择器和我的 onDateSetListener 和 onTimeSetListener 情况如下：

I am trying to keep constraint on date and time. I want that if user tries to set date less than current date then it should show alert, and same thing is to be done with time. I am using date and time pickers and my onDateSetListener and onTimeSetListener are as below:

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()));
    }

您能告诉我什么是为那些听众中写入达到我想要的。在此先感谢...！

can you please tell me what is to be written within those listeners to achieve what i want. Thanks in advance...!!!

推荐答案

创建一个新的Date对象是这样的：

Create a new Date object this way:

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

和使用 INT结果= now.compareTo（theOtherDate）;

结果将是一个int＆LT; 0，如果现在时间小于theOtherDate日期，0，如果他们是平等的，一个int> 0，如果这个日期也更大。

result will be an int < 0 if now Date is less than the theOtherDate Date, 0 if they are equal, and an int > 0 if this Date is greater.

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