/**

     * 以友好的方式显示时间

     * @param sdate

     * @return

     */

    public static String friendly_time(String sdate) {

        Date time = toDate(sdate);

        if(time == null) {

            return "Unknown";

        }

        String ftime = "";

        Calendar cal = Calendar.getInstance();

        //判断是否是同一天

        String curDate = dateFormater2.get().format(cal.getTime());

        String paramDate = dateFormater2.get().format(time);

        if(curDate.equals(paramDate)){

            int hour = (int)((cal.getTimeInMillis() - time.getTime())/3600000);

            if(hour == 0)

                ftime = Math.max((cal.getTimeInMillis() - time.getTime()) / 60000,1)+"分钟前";

            else

                ftime = hour+"小时前";

            return ftime;

        }

        long lt = time.getTime()/86400000;

        long ct = cal.getTimeInMillis()/86400000;

        int days = (int)(ct - lt);

        if(days == 0){

            int hour = (int)((cal.getTimeInMillis() - time.getTime())/3600000);

            if(hour == 0)

                ftime = Math.max((cal.getTimeInMillis() - time.getTime()) / 60000,1)+"分钟前";

            else

                ftime = hour+"小时前";

        }

        else if(days == 1){

            ftime = "昨天";

        }

        else if(days == 2){

            ftime = "前天";

        }

        else if(days > 2 && days <= 10){

            ftime = days+"天前";

        }

        else if(days > 10){

            ftime = dateFormater2.get().format(time);

        }

        return ftime;

    }

/**

     * 将字符串转位日期类型

     * @param sdate

     * @return

     */

    public static Date toDate(String sdate) {

        try {

            return dateFormater.get().parse(sdate);

        } catch (ParseException e) {

            return null;

        }

    }

private final static ThreadLocal<SimpleDateFormat> dateFormater = new ThreadLocal<SimpleDateFormat>() {

        @Override

        protected SimpleDateFormat initialValue() {

            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        }

    };

private final static ThreadLocal<SimpleDateFormat> dateFormater2 = new ThreadLocal<SimpleDateFormat>() {

        @Override

        protected SimpleDateFormat initialValue() {

            return new SimpleDateFormat("yyyy-MM-dd");

        }

    };