Question

我正在使用datepicker对话框，并尝试将当前日期与对话框中指定的日期进行比较。如果日期在当前日期之前，我希望显示无效日期。

输入的当前日期和日期格式相同。但我收到了错误。在控制台中打印时，当前日期和输入日期的格式相同

if(date1.before(currDate))
{
     Toast.makeText(getApplicationContext(), "Enter the valid Date", Toast.LENGTH_LONG).show();
}

结果：

当前日期5/7/2017

选择日期5-7-2017

Answer 1

试试这个

        String strCurrDate = cal.get(Calendar.DATE) + "/" + (cal.get(Calendar.MONTH) + 1) + "/" + cal.get(Calendar.YEAR);
        String strAnotherDate = "05/03/2017";
        SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");

        try {
            Date currDate = formatter.parse(strCurrDate);
            Date anotherDate = formatter.parse(strAnotherDate);
            if (currDate.before(anotherDate)) {
                Toast.makeText(getApplicationContext(), "Enter the valid Date", Toast.LENGTH_LONG).show();
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }

Answer 2

您可以通过

直接停用datepicker中的过去日期

datePicker.setMinDate(System.currentTimeMillis() - 1000);

您只能通过转换毫秒来比较时间

  Date setDateTime = input.parse(todayTime);
  calendar1.setTime(setDateTime);
  selectedTime=calendar1.getTimeInMillis();

  msTime = System.currentTimeMillis();//current time
//and compare msTime and setsetDateTime 
  if (selectedTime>msTime){
//your logic
}

或者您可以通过以数字形式显示日期格式来直接比较日期 5-7-2017是572017并将其与相同格式的选定日期进行比较

Answer 3

您可以尝试使用此代码进行日期比较

@SuppressLint("SimpleDateFormat")
public static boolean compareSameDate(String firstDate, String secondDate) {
    boolean flag = false;
    try {
        SimpleDateFormat formatter = new SimpleDateFormat(
            "dd/MM/yyyy",
            Locale.ENGLISH);

        Date date1 = formatter.parse(firstDate);
        Date date2 = formatter.parse(secondDate);


        if (date2.compareTo(date1) == 0) {
            flag = true;
        } else if (date2.compareTo(date1) < 0) {
            flag = true;
        } else {
            flag = false;
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return flag;
}

Answer 4

你可以这样试试，

try {
    String currentDateString = "5/7/2017";
    SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");

    Date currDate = formatter.parse(currentDateString);

    String pickDateString = "5-7-2017";
    formatter = new SimpleDateFormat("dd-MM-yyyy");

    Date pickDate = formatter.parse(pickDateString);

    if (pickDate.before(currDate)) {
        Toast.makeText(getApplicationContext(), "Enter the valid Date", Toast.LENGTH_LONG).show();
    }
} catch (ParseException e) {
    e.printStackTrace();
}

android比较日期我无法比较两个日期......我提到了许多教程

4 个答案: