Android - 多次更新 DatePicker 的 minDate 和 maxDate

Question

我有 2 个 DatePicker，第一个是开始日期，第二个是结束日期。我希望两者都具有当前日期的 maxDate （这适用于我的代码），并且我希望当我更改开始日期时，第二个 DatePicker 的 minDate 将更新为该日期（反之亦然）。使用此侦听器，我可以处理操作，但第二个 DatePicker 不会在布局上刷新其 minDate。

private DatePicker.OnDateChangedListener startDataListener = new DatePicker.OnDateChangedListener() {

    public void onDateChanged(DatePicker view, int year, int monthOfYear,
            int dayOfMonth) { 
        Calendar c = Calendar.getInstance();
        c.set(year, monthOfYear, dayOfMonth);
        endDate.setMinDate(c.getTimeInMillis());
    }
};

private DatePicker.OnDateChangedListener endDateListener = new DatePicker.OnDateChangedListener() {

    public void onDateChanged(DatePicker view, int year, int monthOfYear,
            int dayOfMonth) {

        Calendar c = Calendar.getInstance();
        c.set(year, monthOfYear, dayOfMonth);
        startDate.setMaxDate(c.getTimeInMillis());
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    startDate= (DatePicker)findViewById(***);
    endDate= (DatePicker)findViewById(***);

    startDate.setMaxDate(Calendar.getInstance().getTimeInMillis());
    startDate.init(year, month, day, startDateListener);

    endDate.setMinDate(c.getTimeInMillis()-1000);
    endDate.setMaxDate(c.getTimeInMillis());
    endDate.init(year, month, day, endDateListener);
}

Answer 1

来自https://stackoverflow.com/a/19722636

这是因为setMinDate() 的代码有检查：

if (mTempDate.get(Calendar.YEAR) == mMinDate.get(Calendar.YEAR) && mTempDate.get(Calendar.DAY_OF_YEAR) != mMinDate.get(Calendar.DAY_OF_YEAR)
        return;

简单的解决方法是首先设置不同年份的最小日期。

使用建议的解决方案并在应用解决方案时避免执行侦听器我来到了这个：

DatePicker startDate, endDate;
Calendar minDate = Calendar.getInstance(), maxDate = Calendar.getInstance();
boolean callFromStartDate = false, callFromEndDate = false;

private DatePicker.OnDateChangedListener startDateListener = new DatePicker.OnDateChangedListener() {
    public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        // Avoid listener execution when there's a forced updated on picker
        if(callFromEndDate){
            callFromEndDate = false;
            return;
        }

        callFromStartDate = true;

        // Force picker update
        minDate.set(year - 1, monthOfYear, dayOfMonth);
        endDate.setMinDate(minDate.getTimeInMillis());  // Calls onDateChange from the other picker

        callFromStartDate = true;

        // Update the picker to the desired date
        minDate.set(year, monthOfYear, dayOfMonth);
        endDate.setMinDate(minDate.getTimeInMillis());
    }
};

private DatePicker.OnDateChangedListener endDateListener = new DatePicker.OnDateChangedListener() {
    public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        if(callFromStartDate) {
            callFromStartDate = false;
            return;
        }

        callFromEndDate = true;

        maxDate.set(year + 1, monthOfYear, dayOfMonth);
        startDate.setMaxDate(maxDate.getTimeInMillis());

        callFromEndDate = true;

        maxDate.set(year, monthOfYear, dayOfMonth);
        startDate.setMaxDate(maxDate.getTimeInMillis());
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    startDate = (DatePicker) findViewById(R.id.datePicker);
    endDate = (DatePicker) findViewById(R.id.datePicker2);

    Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);
    long initialTimeInMillis = c.getTimeInMillis();

    startDate.setMinDate(initialTimeInMillis-2000000000);
    startDate.setMaxDate(initialTimeInMillis);
    startDate.init(year, month, day, startDateListener);

    endDate.setMinDate(initialTimeInMillis-2000000000);
    endDate.setMaxDate(initialTimeInMillis);
    endDate.init(year, month, day, endDateListener);
}

Answer 2

这是因为 setMinDate() 方法有检查

if (mTempDate.get(Calendar.YEAR) == mMinDate.get(Calendar.YEAR)
            && mTempDate.get(Calendar.DAY_OF_YEAR) != mMinDate.get(Calendar.DAY_OF_YEAR){
        return;}

简单设置

mPicker.setMinDate(0); 
//The Min date you wish to set.
mPicker.setMinDate(new LocalDate().minusWeeks(2)
                            .toDateTimeAtStartOfDay().getMillis());

至此，年份已更改为新的最小日期，因此它将设置新日期。 这对我有用

Answer 3

只需初始化DatePickerDialog对象TWICE或MULTIPLE次，每次更改setMinDate(milisecs)。

void yourListenerMethod() {
     datePickerDialog2 = new DatePickerDialog(getActivity(), date2, myCalendar
            .get(Calendar.YEAR), myCalendar.get(Calendar.MONTH),
            myCalendar.get(Calendar.DAY_OF_MONTH));
    datePickerDialog2.getDatePicker().setMaxDate(System.currentTimeMillis()-1000);
    datePickerDialog2.getDatePicker().setMinDate(date.getTime());
}