android时间工具--多久之前

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");
}
}