Android 中日期相關的工具類

 

安卓中獲取日期的工具類：

今天項目中用到自己獲取日期，自己寫了一個獲取時間的工具類，分享出來：

包括獲取 1 當前年月日 2 當前是周幾  3、根據日期獲取是周幾 4、獲取7天的日期 5、獲取當天往後的一週

 

package com.example.course;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.TimeZone;

public class DateUtils {

	private static String mYear; // 當前年
	private static String mMonth; // 月
	private static String mDay;
	private static String mWay;
	

	/**
	 * 獲取當前日期幾月幾號
	 */
	public static String getDateString() {

		final Calendar c = Calendar.getInstance();
		c.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
		mMonth = String.valueOf(c.get(Calendar.MONTH) + 1);// 獲取當前月份
		mDay = String.valueOf(c.get(Calendar.DAY_OF_MONTH));// 獲取當前月份的日期號碼
		return mMonth + "月" + mDay + "日";
	}

	/**
	 * 獲取當前年月日
	 * 
	 * @return
	 */
	public static String StringData() {
		
		final Calendar c = Calendar.getInstance();
		c.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
		mYear = String.valueOf(c.get(Calendar.YEAR));// 獲取當前年份
		mMonth = String.valueOf(c.get(Calendar.MONTH) + 1);// 獲取當前月份
		mDay = String.valueOf(c.get(Calendar.DAY_OF_MONTH));// 獲取當前月份的日期號碼
		return mYear + "-" + mMonth + "-" + mDay;
	}

	/**
	 * 獲取當前是周幾
	 * 
	 */
	public static String getWeekString() {
		final Calendar c = Calendar.getInstance();
		mWay = String.valueOf(c.get(Calendar.DAY_OF_WEEK));
		if ("1".equals(mWay)) {
			mWay = "周天";
		} else if ("2".equals(mWay)) {
			mWay = "週一";
		} else if ("3".equals(mWay)) {
			mWay = "週二";
		} else if ("4".equals(mWay)) {
			mWay = "週三";
		} else if ("5".equals(mWay)) {
			mWay = "週四";
		} else if ("6".equals(mWay)) {
			mWay = "週五";
		} else if ("7".equals(mWay)) {
			mWay = "週六";
		}
		return mDay;
	}

	/**
	 * 根據當前日期獲得是星期幾
	 * 
	 * @return
	 */
	public static String getWeek(String time) {
		String Week = "";

		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		Calendar c = Calendar.getInstance();
		try {

			c.setTime(format.parse(time));

		} catch (ParseException e) {
			e.printStackTrace();
		}
		if (c.get(Calendar.DAY_OF_WEEK) == 1) {
			Week += "周天";
		}
		if (c.get(Calendar.DAY_OF_WEEK) == 2) {
			Week += "週一";
		}
		if (c.get(Calendar.DAY_OF_WEEK) == 3) {
			Week += "週二";
		}
		if (c.get(Calendar.DAY_OF_WEEK) == 4) {
			Week += "週三";
		}
		if (c.get(Calendar.DAY_OF_WEEK) == 5) {
			Week += "週四";
		}
		if (c.get(Calendar.DAY_OF_WEEK) == 6) {
			Week += "週五";
		}
		if (c.get(Calendar.DAY_OF_WEEK) == 7) {
			Week += "週六";
		}
		return Week;
	}
	/**
          * 獲取今天往後一週的日期（年-月-日） */
           public static List<String> get7date() {
                  List<String> dates = new ArrayList<String>();
                 final Calendar c = Calendar.getInstance();
                 c.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
                java.text.SimpleDateFormat sim = new java.text.SimpleDateFormat("yyyy-MM-dd");
                String date = sim.format(c.getTime());
                 dates.add(date);
                     for (int i = 0; i < 6; i++) {
                          c.add(java.util.Calendar.DAY_OF_MONTH, 1);  
                            date = sim.format(c.getTime());
                               dates.add(date);

                               return dates;
                         }
	/**
	 * 獲取今天往後一週的日期（幾月幾號）
	 */
	public static  List<String> getSevendate() {
		List<String > dates = new ArrayList<String>();
		final Calendar c = Calendar.getInstance();
		c.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
		
		for (int i = 0; i < 7; i++) {
			mYear = String.valueOf(c.get(Calendar.YEAR));// 獲取當前年份
			mMonth = String.valueOf(c.get(Calendar.MONTH) + 1);// 獲取當前月份
			mDay = String.valueOf(c.get(Calendar.DAY_OF_MONTH)+i);// 獲取當前日份的日期號碼
			String date =mMonth + "月" + mDay + "日";
			dates.add(date);
		}
		return dates;
	}
	/**
	 * 獲取今天往後一週的集合
	 */
	public static List<String > get7week(){
		 String week="";
		List<String > weeksList = new ArrayList<String>();
		List<String> dateList = get7date();
		for(String s:dateList ){
			if (s.equals(StringData())) {
				week="今天";
			}else {
				week=getWeek(s);
			}
			weeksList.add(week);
		}
		return weeksList;
	}

  /**
     * 判斷當前日期是否爲今天
     */
    public static boolean isToday(long time) {
        Date date = new Date(time);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String param = sdf.format(date);//參數時間
        String now = sdf.format(new Date());//當前時間
        if (param.equals(now)) {
            return true;
        }
        return false;
    }
  /**
     * 獲取今天往後一天的日期（時間戳）
     *時間戳 增加24小時
     */
    public static long getNextDate(long time) {
        long date = time + 24 * 60 * 60 * 1000;
        return date;
    }

    /**
     * 獲取今天往前一天的日期（時間戳）

     */
    public static long getBeforeDate(long time) {
        long date = time - 23 * 60 * 60 * 1000;
        return date;
    }

}