看着别人的应用的时间显示着“刚刚”、“2分钟之前”、“下午 2:00”是不是很羡慕？但是常常因为项目时间紧凑，没空去扣这些细节的你一定很想要一个这样的小工具啦，这里就送大家一个这样的格式化时间小工具：
Gist点这里

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;

/**
 * Created by solo on 15/4/11.
 */
public class DateUtils {

    public static String formatDateTime(Date date) {
        String text;
        long dateTime = date.getTime();
        if (isSameDay(dateTime)) {
            Calendar calendar = GregorianCalendar.getInstance();
            if (inOneMinute(dateTime, calendar.getTimeInMillis())) {
                return "刚刚";
            } else if (inOneHour(dateTime, calendar.getTimeInMillis())) {
                return String.format("%d分钟之前", Math.abs(dateTime - calendar.getTimeInMillis()) / 60000);
            } else {
                calendar.setTime(date);
                int hourOfDay = calendar.get(Calendar.HOUR_OF_DAY);
                if (hourOfDay > 17) {
                    text = "晚上 hh:mm";
                } else if (hourOfDay >= 0 && hourOfDay <= 6) {
                    text = "凌晨 hh:mm";
                } else if (hourOfDay > 11 && hourOfDay <= 17) {
                    text = "下午 hh:mm";
                } else {
                    text = "上午 hh:mm";
                }
            }
        } else if (isYesterday(dateTime)) {
            text = "昨天 HH:mm";
        } else if (isSameYear(dateTime)) {
            text = "M月d日 HH:mm";
        } else {
            text = "yyyy-M-d HH:mm";
        }

        // 注意，如果使用android.text.format.DateFormat这个工具类，在API 17之前它只支持adEhkMmszy
        return new SimpleDateFormat(text, Locale.CHINA).format(date);
    }

    private static boolean inOneMinute(long time1, long time2) {
        return Math.abs(time1 - time2) < 60000;
    }

    private static boolean inOneHour(long time1, long time2) {
        return Math.abs(time1 - time2) < 3600000;
    }

    private static boolean isSameDay(long time) {
        long startTime = floorDay(Calendar.getInstance()).getTimeInMillis();
        long endTime = ceilDay(Calendar.getInstance()).getTimeInMillis();
        return time > startTime && time < endTime;
    }

    private static boolean isYesterday(long time) {
        Calendar startCal;
        startCal = floorDay(Calendar.getInstance());
        startCal.add(Calendar.DAY_OF_MONTH, -1);
        long startTime = startCal.getTimeInMillis();

        Calendar endCal;
        endCal = ceilDay(Calendar.getInstance());
        endCal.add(Calendar.DAY_OF_MONTH, -1);
        long endTime = endCal.getTimeInMillis();
        return time > startTime && time < endTime;
    }

    private static boolean isSameYear(long time) {
        Calendar startCal;
        startCal = floorDay(Calendar.getInstance());
        startCal.set(Calendar.MONTH, Calendar.JANUARY);
        startCal.set(Calendar.DAY_OF_MONTH, 1);
        return time >= startCal.getTimeInMillis();
    }

    private static Calendar floorDay(Calendar startCal) {
        startCal.set(Calendar.HOUR_OF_DAY, 0);
        startCal.set(Calendar.MINUTE, 0);
        startCal.set(Calendar.SECOND, 0);
        startCal.set(Calendar.MILLISECOND, 0);
        return startCal;
    }

    private static Calendar ceilDay(Calendar endCal) {
        endCal.set(Calendar.HOUR_OF_DAY, 23);
        endCal.set(Calendar.MINUTE, 59);
        endCal.set(Calendar.SECOND, 59);
        endCal.set(Calendar.MILLISECOND, 999);
        return endCal;
    }

}

代码很简单，一看就懂的。

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