android时间工具--多久之前

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在开发新闻客户端的时候，是在会显示时间是多久之前，比如10分钟前，8小时前，一月前等等。
下面是一个简单的实现：

import android.util.Log;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;public class DateUtil {    private final static long minute = 60 * 1000;// 1分钟    private final static long hour = 60 * minute;// 1小时    private final static long day = 24 * hour;// 1天    private final static long month = 31 * day;// 月    private final static long year = 12 * month;// 年    private void testDiffDate() {        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        Date d = null;        try {            d = sdf.parse("2016-02-16 09:57:18");            Log.i("DateUtil", "testDate: " + d.getTime());            long diff = new Date().getTime() - d.getTime();            Log.i("DateUtil", "testDate: " + d.getTime());        } catch (ParseException e) {            e.printStackTrace();        }        long diff = new Date().getTime() - d.getTime();        long r = 0;        if (diff > year) {            r = (diff / year);            Log.i("DateUtil", "testDate: " + r + "年前");        } else if (diff > month) {            r = (diff / month);            Log.i("DateUtil", "testDate: " + r + "个月前");        } else if (diff > day) {            r = (diff / day);            Log.i("DateUtil", "testDate: " + r + "天前");        } else if (diff > hour) {            r = (diff / hour);            Log.i("DateUtil", "testDate: " + r + "个小时前");        } else if (diff > minute) {            r = (diff / minute);            Log.i("DateUtil", "testDate: " + r + "分钟前");        } else            Log.i("DateUtil", "testDate: 刚刚");    }}

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