#SimpleDateFormat #时间转换 将时间戳转化为指定格式的时间

RelativeTime.java

package com.xianguo.xreader.utils;

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

import android.annotation.SuppressLint;

public class RelativeTime {

	private static final long ONE_DAY = 86400000L;
	private static final long ONE_HOUR = 3600000L;
	private static final long ONE_MINUTE = 60000L;
	@SuppressLint("SimpleDateFormat") private static SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MM月dd日");

	public static String format(long milliseconds) {

		long l = new Date().getTime() - milliseconds;
		String str;
		if (l < ONE_MINUTE) {
			str = "刚刚";
		} else if (l < ONE_HOUR) {
			str = toMinutes(l) + " 分钟前";
		} else if (l < ONE_DAY) {
			str = toHours(l) + " 小时前";
		} else if (toDays(l) == 1L) {
			str = "昨天";
		} else {
			str = simpleDateFormat.format(milliseconds);
		}

		return str;
	}

	private static long toDays(long milliseconds) {
		return toHours(milliseconds) / 24L;
	}

	private static long toHours(long milliseconds) {
		return toMinutes(milliseconds) / 60L;
	}

	private static long toMinutes(long milliseconds) {
		return toSeconds(milliseconds) / 60L;
	}

	private static long toSeconds(long milliseconds) {
		return milliseconds / 1000L;
	}

}