Android实现在当前日期基础上增加一天（以及日期时间转换的工具类）

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最近项目中有个需求是要添加倒计时的功能，需要在原日期的基础上加上一天。

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
 
public class KXX {
 
    public static void main(String[] args) {
        SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");
 
        Date today = new Date();
        System.out.println("今天是:" + f.format(today));
 
        Calendar c = Calendar.getInstance();
        c.setTime(today);
        c.add(Calendar.DAY_OF_MONTH, 1);// 今天+1天
 
        Date tomorrow = c.getTime();
        System.out.println("明天是:" + f.format(tomorrow));
    }
}

/*
     * 将时间转换为时间戳
     */
    public static long dateToStamp(String s) throws ParseException {
        String res;
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = simpleDateFormat.parse(s);
        long ts = date.getTime();
        res = String.valueOf(ts);
        return ts;
    }

/*
     * 将时间戳转换为时间
     */
    public static String stampToDate(String s){
        String res;
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        long lt = new Long(s);
        Date date = new Date(lt);
        res = simpleDateFormat.format(date);
        return res;
    }

/**
     * long转换时分秒
     * @param l
     * @return
     */
    public static String formatLongToTimeStr(Long l) {
        int hour = 0;
        int minute = 0;
        int second = 0;
        second = l.intValue() ;
        if (second > 60) {
            minute = second / 60;   //取整
            second = second % 60;   //取余
        }
        if (minute > 60) {
            hour = minute / 60;
            minute = minute % 60;
        }
        String strTime = hour+":"+minute+":"+second;
        return strTime;
    }