android studio 禁用日期选择器中的天数

Question

我想禁用日期选择器中的某一天我有一个数组来存储我想要禁用的日期。

我有这个代码来禁用日历中的日期

    for (Calendar loopdate = min_date_c;
                     min_date_c.before(max_date_c);
                     min_date_c.add(Calendar.DATE, 1), loopdate = min_date_c) {
                    int dayOfWeek = loopdate.get(Calendar.DAY_OF_WEEK);


                    if (dayOfWeek == Calendar.SATURDAY || dayOfWeek == Calendar.FRIDAY) {
                        Calendar[] disabledDays = new Calendar[1];
                        disabledDays[0] = loopdate;
                        datePickerDialog.setDisabledDays(disabledDays);
                    }
                }

我尝试使用此代码来禁用存储在数组列表中的日期，但它不起作用。它仅禁用数组列表中的第一项

   ArrayList a=new ArrayList();
            a.add(1);  //saturday
            a.add(2);  //sunday
            a.add(3);  //monday
            int day;


            for(int i=0; i<a.size();i++) {

                day=(Integer)a.get(i);



                for (Calendar loopdate = min_date_c;
                     min_date_c.before(max_date_c);
                     min_date_c.add(Calendar.DATE, 1), loopdate = min_date_c) {
                    int dayOfWeek = loopdate.get(Calendar.DAY_OF_WEEK);



                    if (day == 1) {
                        System.out.println(day);
                        if (dayOfWeek == Calendar.SATURDAY || dayOfWeek == Calendar.FRIDAY) {
                            Calendar[] disabledDays = new Calendar[1];
                            disabledDays[0] = loopdate;
                            datePickerDialog.setDisabledDays(disabledDays);
                        }
                    }

                  else  if (day==2) {
                        System.out.println(day);

                        if (dayOfWeek == Calendar.SUNDAY || dayOfWeek == Calendar.FRIDAY) {
                            Calendar[] disabledDays = new Calendar[1];
                            disabledDays[0] = loopdate;
                            datePickerDialog.setDisabledDays(disabledDays);
                        }
                    }

                   else if (day==3) {
                        System.out.println(day);
                        if (dayOfWeek == Calendar.MONDAY || dayOfWeek == Calendar.FRIDAY) {
                            Calendar[] disabledDays = new Calendar[1];
                            disabledDays[0] = loopdate;
                            datePickerDialog.setDisabledDays(disabledDays);
                        }
                    }


                }

我该如何解决？

Answer 1

您可以使用Material Design组件MaterialDatePicker更轻松高效地控制日历；它允许您通过实现接口来控制日历的每一天CalendarConstraints.DateValidator。

具体来说，在您的问题中，您需要禁用特定日期；因此，您将创建一个实现 的类CalendarConstraints.DateValidator，然后：

• 重写所需的方法，并构建一个 Parcelable

CalendarConstraints.DateValidator扩展Parcelable以维护DateValidator跨设备配置更改。Parcelable在进程之间传递时会中断。

• 重写isValid(long date)方法，验证日历中的每个日期并返回一个boolean指示该日期是否有效的方法，换句话说，该日期是否启用或禁用/变暗；因此，如果日期有效，则返回 true，并且该日期将可供用户选择。

下面，我将提供一个禁用2020年 2 月星期一的验证器；您可以以相同的方式轻松禁用任何一天。

实施CalendarConstraints.DateValidator：

static class MondaysOutValidator implements CalendarConstraints.DateValidator {

    int mYear, mMonth, mDayOfWeek;

    MondaysOutValidator(int year, int month, int dayOfWeek) {
        mYear = year;
        mMonth = month;
        mDayOfWeek = dayOfWeek;
    }

    MondaysOutValidator(Parcel parcel) {
        mYear = parcel.readInt();
        mMonth = parcel.readInt();
        mDayOfWeek = parcel.readInt();
    }


    @Override
    public boolean isValid(long date) {

        List<Integer> allXDayOfMonth = getAllXDayOfMonth(mYear, mMonth, mDayOfWeek);

        boolean isValidDays = false;
        for (int xDay : allXDayOfMonth) {
            Calendar calendarStart = Calendar.getInstance();
            Calendar calendarEnd = Calendar.getInstance();
            ArrayList<Long> minDate = new ArrayList<>();
            ArrayList<Long> maxDate = new ArrayList<>();
            calendarStart.set(mYear, mMonth, xDay - 1);
            calendarEnd.set(mYear, mMonth, xDay);
            minDate.add(calendarStart.getTimeInMillis());
            maxDate.add(calendarEnd.getTimeInMillis());
            isValidDays = isValidDays || !(minDate.get(0) > date || maxDate.get(0) < date);
        }

        return !isValidDays;

    }


    private static int getFirstXDayOfMonth(int year, int month, int dayOfWeek) {
        Calendar cacheCalendar = Calendar.getInstance();
        cacheCalendar.set(Calendar.DAY_OF_WEEK, dayOfWeek);
        cacheCalendar.set(Calendar.DAY_OF_WEEK_IN_MONTH, 1);
        cacheCalendar.set(Calendar.MONTH, month);
        cacheCalendar.set(Calendar.YEAR, year);
        return cacheCalendar.get(Calendar.DATE);
    }

    private static List<Integer> getAllXDayOfMonth(int year, int month, int dayOfWeek) {
        final int ONE_WEEK = 7;
        int firstDay = getFirstXDayOfMonth(year, month, dayOfWeek);
        List<Integer> xDays = new ArrayList<>();
        xDays.add(firstDay);

        Calendar calendar = new GregorianCalendar(year, month, firstDay);
        calendar.add(Calendar.DAY_OF_MONTH, ONE_WEEK); // adding 1 Week
        while (calendar.get(Calendar.MONTH) == month) {
            xDays.add(calendar.get(Calendar.DAY_OF_MONTH));
            calendar.add(Calendar.DAY_OF_MONTH, ONE_WEEK); // adding 1 Week
        }

        return xDays;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(mYear);
        dest.writeInt(mMonth);
        dest.writeInt(mDayOfWeek);
    }

    public static final Parcelable.Creator<MondaysOutValidator> CREATOR = new Parcelable.Creator<MondaysOutValidator>() {

        @Override
        public MondaysOutValidator createFromParcel(Parcel parcel) {
            return new MondaysOutValidator(parcel);
        }

        @Override
        public MondaysOutValidator[] newArray(int size) {
            return new MondaysOutValidator[size];
        }
    };


}

然后使用此验证器进行构建CalendarConstraints，以便将这些约束应用于日历日期

/*
 * Limit selectable range to days other than Mondays of the month
 */
private CalendarConstraints.Builder mondayDisableConstraints() {
    CalendarConstraints.Builder constraintsBuilderRange = new CalendarConstraints.Builder();
    constraintsBuilderRange.setValidator(new MondaysOutValidator(2020, Calendar.FEBRUARY, Calendar.MONDAY));
    return constraintsBuilderRange;
}

最后MaterialDatePicker在您的活动/片段中构建您的

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    MaterialDatePicker.Builder<Long> builderRange = MaterialDatePicker.Builder.datePicker();
    builderRange.setCalendarConstraints(mondayDisableConstraints().build());
    builderRange.setTitleText("Select Date Range");
    MaterialDatePicker<Long> pickerRange = builderRange.build();
    pickerRange.show(getSupportFragmentManager(), pickerRange.toString());

}

这是输出：

希望对您有所帮助，也欢迎您进一步支持。