如何让用户使用 datepickerdialog 选择未来的日期？

Question

我想让用户选择今天之后的日期，作为提醒日期，我该怎么做呢？还有，我怎样才能把主题放在这些代码里面，因为没有按钮供用户选择。

这是我的代码结合datapickerdialog和timepickerdialog：

private void setDateTimeField (){

    DatePickerDialog datePickerDialog = new DatePickerDialog(this, new 
DatePickerDialog.OnDateSetListener() {

        @Override
        public void onDateSet(DatePicker datePicker, int selectedYear, int selectedMonth, int selectedDate) {

            year = selectedYear;
            month = selectedMonth;
            day = selectedDate;

            timePicker();
            date_time = year + "-" + (month + 1) + "-" + day;
        }
    },year, month, day);

    final Calendar calendar = Calendar.getInstance();
    Calendar cal = Calendar.getInstance();
    int yy = calendar.get(Calendar.YEAR);
    int mm = calendar.get(Calendar.MONTH);
    int dd = calendar.get(Calendar.DAY_OF_MONTH);

    cal.set(Calendar.MONTH, mm);
    cal.set(Calendar.DAY_OF_MONTH, dd);
    cal.set(Calendar.YEAR, yy);

    datePickerDialog.getDatePicker().setMinDate(cal.getTimeInMillis());

    datePickerDialog.show();
  }
private void timePicker(){
    // Get Current Time
    final Calendar c = Calendar.getInstance();
    hours = c.get(Calendar.HOUR_OF_DAY);
    minutes = c.get(Calendar.MINUTE);
    // Launch Time Picker Dialog
     TimePickerDialog timePickerDialog = new TimePickerDialog(this,new 
TimePickerDialog.OnTimeSetListener() {

                @Override
                public void onTimeSet(TimePicker view, int hourOfDay, int 
minute) {
                    hours = hourOfDay;
                    minutes = minute;
                    modifytime.setText(date_time+" "+hourOfDay + ":" + 
minute);
                }

            }, hours, minutes, false);
    timePickerDialog.show();
}

Answer 1

如果您想将当前日期设置为最小日期，并且过去的日子不应该选择，那么我相信下面的解决方案会起作用

Calendar cal = Calendar.getInstance();
int yy = calendar.get(Calendar.YEAR);
int mm = calendar.get(Calendar.MONTH);
int dd = calendar.get(Calendar.DAY_OF_MONTH);
//Min date setting part
cal.set(Calendar.MONTH, mm);
cal.set(Calendar.DAY_OF_MONTH, dd);
cal.set(Calendar.YEAR, yy);
//Replace your code mDatePickerDialog.getDatePicker().setMaxDate(System.currentTimeMillis()); with the below line
mDatePickerDialog.setMinDate(cal.getTimeInMillis());

由于您只允许用户选择未来的日期，因此您不需要设置 Max date。

完整的代码示例供您参考 -

private void showDateDailog() {

    final DatePickerDialog datePickerDialog = new DatePickerDialog(getApplicationContext(), new DatePickerDialog.OnDateSetListener() {

    @Override
    public void onDateSet(DatePicker datePicker, int selectedYear, int selectedMonth, int selectedDate) {

        year = selectedYear;
        month = selectedMonth;
        day = selectedDate;

        addtime.setText(new StringBuilder().append(year).append("/")
                .append(month + 1).append("/").append(day));

        }
    }, year, month, day);

    final Calendar calendar = Calendar.getInstance();
    Calendar cal = Calendar.getInstance();
    int yy = calendar.get(Calendar.YEAR);
    int mm = calendar.get(Calendar.MONTH);
    int dd = calendar.get(Calendar.DAY_OF_MONTH);
    //Min date setting part
    cal.set(Calendar.MONTH, mm);
    cal.set(Calendar.DAY_OF_MONTH, dd);
    cal.set(Calendar.YEAR, yy);
    datePickerDialog.setMinDate(cal.getTimeInMillis());
    //Maximum date setting part, if you need (Else don't add it)
    /*Calendar calen = Calendar.getInstance();
    calen.set(Calendar.MONTH, mm);
    calen.set(Calendar.DAY_OF_MONTH, dd);
    calen.set(Calendar.YEAR, yy + 2);
    datePickerDialog.setMaxDate(calen.getTimeInMillis());*/
    datePickerDialog.show();
}