Question

我有一个非常简单的日期选择器片段：

public class DatePickerFragment extends DialogFragment implements
        OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    @Override
    public void onDateSet(DatePicker view, int year, int month, int day) {
        Activity a = getActivity();

        Button dateDueButton = (Button) a.findViewById(R.id.dateDue);
        String sYear = Integer.toString(year).substring(2, 4);
        String sMonth = Integer.toString(month + 1);
        String sDay = Integer.toString(day);
        dateDueButton.setText(sMonth + "/" + sDay + "/" + sYear);
    }
}

我希望能够设置“日期边界”。例如，如果当天是2月9日，我希望仅在2月10日或更晚的日期显示在片段上。我该如何实施呢？

Answer 1

使用此方法 getDatePicker（）

，您将从DatepickerDialog获取Datepicker对象

public class DatePickerFragment extends DialogFragment implements
    OnDateSetListener {
   private DatePickerDialog datepic;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    final Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);
    datepic=new DatePickerDialog(getActivity(), this, year, month, day);
    return datepic;
}

@Override
public void onDateSet(DatePicker view, int year, int month, int day) {
    Activity a = getActivity();

    Button dateDueButton = (Button) a.findViewById(R.id.dateDue);
    String sYear = Integer.toString(year).substring(2, 4);
    String sMonth = Integer.toString(month + 1);
    String sDay = Integer.toString(day);
    dateDueButton.setText(sMonth + "/" + sDay + "/" + sYear);
}

public void setMinimumDate(Calendar mintime){
   datepic.getDatePicker().setMinDate(mintime.getTimeInMillis());
}
public void setMaximumDate(Calendar maxtime){
   datepic.getDatePicker().setMaxDate(maxtime.getTimeInMillis());
}

使用公共方法setMinimumDate和setMaximumDate来设置边界

Answer 2

使用minDate课程中的maxDate和DatePicker参数。

请注意，这些是API级别11类，因此您必须自己实现此功能以实现向后兼容性。

Answer 3

那么，您可以获取当前系统日期并将其与用户选择的日期进行比较。如果用户选择的日期小于当前日期，则可以在日期上设置边界。否则，您可以继续保存。给代码片段可以帮助您，

    public static long getTimeDiffInDays(String birthday) {
    int beforeLenght = birthday.length();
    int afterLenght = birthday.replace("/", "").length();
    int checkFormat = beforeLenght - afterLenght;
    String newBirthday;
    if (checkFormat == 2) {
        int lastIndex = birthday.lastIndexOf("/");
        newBirthday = birthday.substring(0, lastIndex).trim();
    } else {
        newBirthday = birthday.trim();
    }
    SimpleDateFormat sdf = new SimpleDateFormat("MM/dd");
    Calendar now = Calendar.getInstance();

    Date newDate = new Date();
    Date olddate = new Date();
    try {
        newDate = sdf.parse(sdf.format(now.getTime()));
        olddate = sdf.parse(newBirthday);
    } catch (ParseException e) {

        e.printStackTrace();
    }
    long datediff = (olddate.getTime() - newDate.getTime())
            / (1000 * 60 * 60 * 24);

    if (datediff < 0)
        return datediff + 365;
    else
        return datediff;
}

在日期选择器片段上设置日期边界

3 个答案: