如何做Android datepicker To date 大于 from date 验证

Question

我有两个 DatePicker。一个带有 From 日期，另一个带有 To 日期。我想要 根据 From date selection 显示 To date 总是大于 from date 。我正在使用 Android 默认日期选择器，并希望禁用过去 TO datepicker 的日期，如果它大于 From 日期，反之亦然。我知道 这个话题在这里被问过很多次。但是，我无法让我的代码工作 喜欢建议的解决方案，所以请帮忙？

Calendar calendarOne = Calendar.getInstance();


     datePickerFrom= new DatePickerDialog(getActivity(), new  
     DatePickerDialog.OnDateSetListener() { 

     @Override 
     public void onDateSet(DatePicker view, int year, int monthOfYear, 
     int dayOfMonth) {
        StringBuilder selectedDate = new 
    StringBuilder().append(dayOfMonth).append("-").append(monthOfYear + 
    1).append("-").append(year);
     fromText.setText(selectedDate);
     fromText.setTextColor(android.graphics.Color.BLACK);
    } 

  }, calendarOne.get(Calendar.YEAR), calendarOne.get(Calendar.MONTH), 
     calendarOne.get(Calendar.DAY_OF_MONTH));

 fromText.setOnClickListener(new View.OnClickListener() {
    @Override 
    public void onClick(View view) {
        datePickerFrom.getDatePicker().setMaxDate(new 
     Date().getTime()); 
        datePickerFrom.show(); 
    } 
}); 


  Calendar calendarTwo = Calendar.getInstance();
  datePickerTo = new DatePickerDialog(getActivity(), new 
  DatePickerDialog.OnDateSetListener() {
    @Override 
    public void onDateSet(DatePicker view, int year, int monthOfYear, int 
    dayOfMonth) {
        StringBuilder selectedDate = new 
   StringBuilder().append(dayOfMonth).append("-").append(monthOfYear + 
   1).append("-").append(year);
        toText.setText(selectedDate);
        toText.setTextColor(android.graphics.Color.BLACK);
      } 
   }, calendarTwo.get(Calendar.YEAR), calendarTwo.get(Calendar.MONTH), 
   calendarTwo.get(Calendar.DAY_OF_MONTH));

   toText.setOnClickListener(new View.OnClickListener() {
    @Override 
    public void onClick(View view) {
       datePickerTo.getDatePicker().setMaxDate(new Date().getTime()); 
       datePickerTo.show(); 
      } 
    }); 
   } 

....................... 更新代码

    final Calendar calendarOne = Calendar.getInstance();
    datePickerFrom= new DatePickerDialog(getActivity(), new
            DatePickerDialog.OnDateSetListener()
            {
                @RequiresApi(api = Build.VERSION_CODES.N)
                @Override
                public void onDateSet(DatePicker view, int year, final int 
    monthOfYear, int dayOfMonth)
                {
                    StringBuilder selectedDate = new
                            StringBuilder().append(dayOfMonth).append("-
      ").append(monthOfYear + 1).append("-").append(year);
                  fromText.setText(selectedDate);
                  fromText.setTextColor(android.graphics.Color.BLACK);

                    Calendar calendarTwo = Calendar.getInstance();
                   datePickerTo = new DatePickerDialog(getActivity());


    datePickerTo.getDatePicker().setMinDate(calendarOne.getTimeInMillis());

                   datePickerTo = new DatePickerDialog(activity, new 
   DatePickerDialog.OnDateSetListener() {

                        @Override
                        public void onDateSet(DatePicker view, int year, int 
    month, int dayOfMonth) {
                            StringBuilder selectedDate = new 
    StringBuilder().append(dayOfMonth).append("-").append(monthOfYear + 
    1).append("-").append(year);
                              toText.setText(selectedDate);

   toText.setTextColor(android.graphics.Color.BLACK);
                        }
                    }, calendarTwo.get(Calendar.YEAR), 
   calendarTwo.get(Calendar.MONTH),
                        calendarTwo.get(Calendar.DAY_OF_MONTH));

                      toText.setOnClickListener(new View.OnClickListener()
                    {
                        @Override
                        public void onClick(View view)
                        {
                           datePickerTo.getDatePicker().setMaxDate(new 
     Date().getTime());
                           datePickerTo.show();
                        }
                    });

                }

            }, calendarOne.get(Calendar.YEAR), 
      calendarOne.get(Calendar.MONTH),
            calendarOne.get(Calendar.DAY_OF_MONTH));

   fromText.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            datePickerFrom.getDatePicker().setMaxDate(new
                    Date().getTime());
            datePickerFrom.show();
        }
    });

Answer 1

首先在 onCreate 之前在你的类中声明以下内容：

private String fromDate;
private DatePickerDialog fromDatePicker;
private DatePickerDialog.OnDateSetListener fromDatePickerListener;
private Calendar fromDateCalendar;
private String toDate;
private DatePickerDialog toDatePicker;
private DatePickerDialog.OnDateSetListener toDatePickerListener;
private Calendar toDateCalendar;

然后在你的 onCreate 方法中添加以下代码：

fromDateCalendar = Calendar.getInstance();
    fromDatePickerListener = new DatePickerDialog.OnDateSetListener() {

        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear,
                              int dayOfMonth) {
            // TODO Auto-generated method stub
            fromDateCalendar.set(Calendar.YEAR, year);
            fromDateCalendar.set(Calendar.MONTH, monthOfYear);
            fromDateCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);

            fromDate = fromDateCalendar.get(Calendar.YEAR) + "-" + (fromDateCalendar.get(Calendar.MONTH)+1) + "-" + fromDateCalendar.get(Calendar.DAY_OF_MONTH);
            //etFromDate.setText(fromDate);
            toDatePicker.getDatePicker().setMinDate(fromDateCalendar.getTimeInMillis());
        }

    };

    toDateCalendar = Calendar.getInstance();
    toDatePickerListener = new DatePickerDialog.OnDateSetListener() {

        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear,
                              int dayOfMonth) {
            // TODO Auto-generated method stub
            toDateCalendar.set(Calendar.YEAR, year);
            toDateCalendar.set(Calendar.MONTH, monthOfYear);
            toDateCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);

            toDate = toDateCalendar.get(Calendar.YEAR) + "-" + (toDateCalendar.get(Calendar.MONTH)+1) + "-" + toDateCalendar.get(Calendar.DAY_OF_MONTH);
            //etToDate.setText(toDate);
        }

    };

    toDatePicker = new DatePickerDialog(getContext(),toDatePickerListener, toDateCalendar.get(Calendar.YEAR), toDateCalendar.get(Calendar.MONTH), toDateCalendar.get(Calendar.DAY_OF_MONTH));
    fromDatePicker = new DatePickerDialog(getContext(),fromDatePickerListener, fromDateCalendar.get(Calendar.YEAR), fromDateCalendar.get(Calendar.MONTH), fromDateCalendar.get(Calendar.DAY_OF_MONTH));

下一步是当您想在单击按钮时显示 datePicker 或在您想显示日期选择器的地方编辑文本时，请使用以下行显示：

fromDatePicker.show();
toDatePicker.show();

如果您想在任何地方（如 textView 或 editText）显示所选日期，也可以使用字符串 fromDate 和 toDate 来显示它们。