TimeUtil工具类

package com.ymw.sqlite.testData;

import android.util.Log;

import java.text.DecimalFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;

public class TimeUtil {

    private static final String TAG = "TimeUtil";


    /**
     * JAVA日期格式输出月份前面不想被自动补0
     *
     * @return 返回 2/15/2012 格式的STRING类型,用M月份不会自动补0，用MM月份会自动补0;
     * <p>
     * SimpleDateFormat sdf = new SimpleDateFormat("yyyyMdd");
     * System.out.println(sdf.format(new java.util.Date()));
     * JAVA日期格式输出月份前面不想被自动补0，那么就用SimpleDateFormat("M/dd/yyyy"); 一个M。
     * 如果想被自动补0，那么就用MM 即是SimpleDateFormat("MM/dd/yyyy");
     */
    public static String getTime_0() {
        //SimpleDateFormat formatter = new SimpleDateFormat("M/dd/yyyy");
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy/M/d");

        //Date currentTime = new Date();//得到当前系统时间
        String timeDes = "2020-11-17 15:33:00";
        Date currentTime = strToDateLong(timeDes);//得到当前系统时间

        String timeStr = formatter.format(currentTime); //将日期时间格式化
        //输出：2009-08-18 20:06:13
        Log.w(TAG, "getTime_0....." + timeStr);
        return timeStr;
    }


    /**
     * 将时间字符串转成 Date类型
     *
     * @param strDate：2020-6-25 15:00:00
     * @return
     */
    public static Date strToDateLong(String strDate) {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        ParsePosition pos = new ParsePosition(0);
        Date strtodate = formatter.parse(strDate, pos);
        return strtodate;
    }

    /**
     * java 实现 发布了多久的时间描述：几分钟后，几小时后，几天后，几个月后，几年后
     */
    public static void testTime() {
        String time = "2020-6-26 13:00:00";
        Date date = strToDateLong(time);
        String diffStr = timeUtile(date);
        Log.e(TAG, "diffTime=" + diffStr);
    }


    private static String timeUtile(Date endTime) {
        // 拿到当前时间戳和发布时的时间戳，然后得出时间戳差
        //Date curTime = new Date();
        Date curTime = strToDateLong("2020-6-25 14:00:00");
        if (endTime.getTime() < curTime.getTime()) {
            Log.e(TAG, "endTime < curTime....");
            return "";
        }

        long timeDiff = endTime.getTime() - curTime.getTime();
        //上面一行代码可以换成以下（兼容性的解决）
        // 单位换算
        long min = 60 * 1000;
        long hour = min * 60;
        long day = hour * 24;
        long week = day * 7;
        long month = week * 4;
        long year = month * 12;

        DecimalFormat df = new DecimalFormat("#");
        // 计算发布时间距离当前时间的周、天、时、分
        // floor返回最小值：2小时2分钟后即是2小时后；   ceil返回最大值：2小时2分钟后即是3小时后
        double exceedyear = Math.floor(timeDiff / year);
        double exceedmonth = Math.floor(timeDiff / month);
        double exceedWeek = Math.floor(timeDiff / week);
        double exceedDay = Math.floor(timeDiff / day);
        double exceedHour = Math.floor(timeDiff / hour);
        double exceedMin = Math.floor(timeDiff / min);

        // 最后判断时间差到底是属于哪个区间，然后return
        if (exceedyear < 100 && exceedyear > 0) {
            return df.format(exceedyear) + "年后";
        } else {
            if (exceedmonth < 12 && exceedmonth > 0) {
                return df.format(exceedmonth) + "月后";
            } else {
                if (exceedWeek < 4 && exceedWeek > 0) {
                    return df.format(exceedWeek) + "星期后";
                } else {
                    if (exceedDay < 7 && exceedDay > 0) {
                        return df.format(exceedDay) + "天后";
                    } else {
                        if (exceedHour < 24 && exceedHour > 0) {
                            return df.format(exceedHour) + "小时后";
                        } else {
                            return df.format(exceedMin) + "分钟后";
                        }
                    }
                }
            }
        }
    }


    private static String getDatePoor(Date endDate, Date nowDate) {
        long nd = 1000 * 24 * 60 * 60;
        long nh = 1000 * 60 * 60;
        long nm = 1000 * 60;
        // long ns = 1000;
        // 获得两个时间的毫秒时间差异
        long diff = endDate.getTime() - nowDate.getTime();
        // 计算差多少天
        long day = diff / nd;
        // 计算差多少小时
        long hour = diff % nd / nh;
        // 计算差多少分钟
        long min = diff % nd % nh / nm;
        // 计算差多少秒//输出结果
        // long sec = diff % nd % nh % nm / ns;
        return day + "天" + hour + "小时" + min + "分钟";
    }


}