Android 日期 Calendar 关于时间段的操作

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根据一个传递过来的日期，得到指定类型的时间段：例如，传递过来一个日期，并指定一个类型(周、月份、季度、半年、年),返回一个Timespan，包含开始日期和结束日期.

类型枚举：

public enum TimeTypeEnum {    Year(1),    HalfYear(2),    Quarter(3),    Month(4),    Week(5),    Day(6);        private int mValue;    TimeTypeEnum(int value) {        mValue = value;    }    public int getValue() {        return mValue;    }}

然后是主方法的返回类型：

public class TimeSpan {    public Date startDate;    public Date endDate;    @Override    public String toString() {        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.CHINA);        return String.format("%s - %s",  format.format(startDate),format.format(endDate));    }}

最后是主类：

package com.example.terry;import java.util.Calendar;import java.util.Date;import java.util.Locale;/** ** Created by 程腾光 on 2016/10/26 */public class JetDateUtil {    static Calendar calendar = Calendar.getInstance(Locale.CHINESE);    public static TimeSpan getTimeSpan(Date givenDate, TimeTypeEnum timeTypeEnum) {        switch (timeTypeEnum) {            case Week:                return getWeekTimeSpan(givenDate);            case Month:                return getMonthTimeSpan(givenDate);            case Quarter:                return getQuarterTimeSpan(givenDate);            case HalfYear:                return getHalfYearTimeSpan(givenDate);            case Year:                return getYearTimeSpan(givenDate);            default:                return getYearTimeSpan(givenDate);        }    }    /**     * 得到指定日期的所在星期的时间周期     *     * @param givenDate     * @return     */    public static TimeSpan getWeekTimeSpan(Date givenDate) {        calendar.setTime(givenDate);        TimeSpan timespan = new TimeSpan();        calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);        timespan.startDate = calendar.getTime();        calendar.add(Calendar.DAY_OF_WEEK, 6);        timespan.endDate = calendar.getTime();        return timespan;    }    /**     * 得到指定日期的所在月份的时间周期     *     * @param givenDate     * @return     */    public static TimeSpan getMonthTimeSpan(Date givenDate) {        calendar.setTime(givenDate);        TimeSpan timespan = new TimeSpan();        calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));        timespan.startDate = calendar.getTime();        calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));        timespan.endDate = calendar.getTime();        return timespan;    }        /**     * 得到指定日期的所在季度的时间周期     *     * @param givenDate     * @return     */    public static TimeSpan getQuarterTimeSpan(Date givenDate) {        calendar.setTime(givenDate);        TimeSpan timeSpan = new TimeSpan();        int month = calendar.get(Calendar.MONTH) + 1;        if (month >= 1 && month <= 3) { // given date is belong the first half year.            calendar.set(Calendar.MONTH, Calendar.JANUARY);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));            timeSpan.startDate = calendar.getTime();            calendar.set(Calendar.MONTH, Calendar.MARCH);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));            timeSpan.endDate = calendar.getTime();        } else if (month >= 4 && month <= 6) {// given date is belong the last half year.            calendar.set(Calendar.MONTH, Calendar.APRIL);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));            timeSpan.startDate = calendar.getTime();            calendar.set(Calendar.MONTH, Calendar.JUNE);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));            timeSpan.endDate = calendar.getTime();        } else if (month >= 7 && month <= 9) {// given date is belong the last half year.            calendar.set(Calendar.MONTH, Calendar.JULY);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));            timeSpan.startDate = calendar.getTime();            calendar.set(Calendar.MONTH, Calendar.SEPTEMBER);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));            timeSpan.endDate = calendar.getTime();        } else if (month >= 10 && month <= 12) {// given date is belong the last half year.            calendar.set(Calendar.MONTH, Calendar.OCTOBER);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));            timeSpan.startDate = calendar.getTime();            calendar.set(Calendar.MONTH, Calendar.DECEMBER);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));            timeSpan.endDate = calendar.getTime();        }        return timeSpan;    }    /**     * 得到指定日期的所在半年的时间周期     *     * @param givenDate     * @return     */    public static TimeSpan getHalfYearTimeSpan(Date givenDate) {        calendar.setTime(givenDate);        TimeSpan timeSpan = new TimeSpan();        int month = calendar.get(Calendar.MONTH) + 1; //得到的月份是从0开始的.        if (month >= 1 && month <= 6) { // given date is belong the first half year.            calendar.set(Calendar.MONTH, Calendar.JANUARY);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));            timeSpan.startDate = calendar.getTime();            calendar.set(Calendar.MONTH, Calendar.JUNE);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));            timeSpan.endDate = calendar.getTime();        } else {// given date is belong the last half year.            calendar.set(Calendar.MONTH, Calendar.JULY);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));            timeSpan.startDate = calendar.getTime();            calendar.set(Calendar.MONTH, Calendar.DECEMBER);            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));            timeSpan.endDate = calendar.getTime();        }        return timeSpan;    }    /**     * 得到指定日期的所在年的时间周期     *     * @param givenDate     * @return     */    public static TimeSpan getYearTimeSpan(Date givenDate) {        calendar.setTime(givenDate);        TimeSpan timeSpan = new TimeSpan();        calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_YEAR));        timeSpan.startDate = calendar.getTime();        calendar.set(Calendar.DAY_OF_YEAR, calendar.getActualMaximum(Calendar.DAY_OF_YEAR));        timeSpan.endDate = calendar.getTime();        return timeSpan;    }}

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