本方式实现将绝对日期如2015-6-23 8:00:00时间字符串转换为昨天8：00，明天21:00，今天5:23等等。在安卓开始中涉及时间显示相当实用。 注意按代码中要求传入时间字符串time的参数

TimeToString(String time)代码：

@SuppressWarnings("deprecation")
public static String TimeToString(String time) {
    String timeString=time;
    try {
        SimpleDateFormat dateFormat;

        dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        SimpleDateFormat dateFormat2 = new SimpleDateFormat("HH:mm");
        SimpleDateFormat dateFormat3 = new SimpleDateFormat("yyyy-MM-dd HH:mm");
        dateFormat.setLenient(false);
        Date timeDate = dateFormat.parse(time);

// Long timeStamp = timeDate.getTime();
// Long currentStamp = new Date().getTime();
// Long timetogo = currentStamp - timeStamp;
Calendar calDateA = Calendar.getInstance();
Calendar calDateB = Calendar.getInstance();
calDateB.setTime(timeDate);
int year=calDateA.get(Calendar.YEAR);
int mon=calDateA.get(Calendar.MONTH);
int day=calDateA.get(Calendar.DATE);
int currentyear=calDateB.get(Calendar.YEAR);
int currentmon=calDateB.get(Calendar.MONTH);
int currentday=calDateB.get(Calendar.DATE);
Log.e(“bypaper”,currentyear+” “+currentmon+” “+year+” “+day+”　“);
if (year==currentyear&&mon==currentmon&&day==currentday) {
timeString=”今天”+dateFormat2.format(timeDate);
}else if (year==currentyear&&mon==currentmon&&(day-currentday)==1) {
timeString=”昨天”+dateFormat2.format(timeDate);
}else if (year==currentyear&&mon==currentmon&&(day-currentday)==-1) {
timeString=”明天”+dateFormat2.format(timeDate);
}else {
timeString=dateFormat3.format(timeDate);
}

    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }// util类型

    return timeString;

}