如何在android中使用日历显示日期和时间

Question

如何在 android 中使用日历及时显示日期和时间。比如2天前，1个月前。我试过不使用 calendar 。但是如果我们使用日历，我们可以避免一个月中的 28 天和 30 天的问题。如何做到这一点？

Answer 1

按照以下 3 个简单步骤操作： 1. 保存活动发生的时间/日期（您要显示 $ 月或 $ 天前） 2. 计算当前时间/日期。 3. 取当前时间和上次保存时间之间的差异，然后使用相同的时间显示您想要的结果。

String dateStart = "01/14/2017 10:20:18";
        String dateStop = "01/15/2018 11:41:38";

        //HH converts hour in 24 hours format (0-23), day calculation
        SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");

        Date d1 = null;
        Date d2 = null;

        try {
            d1 = format.parse(dateStart);
            d2 = format.parse(dateStop);

            //in milliseconds
            long diff = d2.getTime() - d1.getTime();

            long diffSeconds = diff / 1000 % 60;
            long diffMinutes = diff / (60 * 1000) % 60;
            long diffHours = diff / (60 * 60 * 1000) % 24;
            long diffDays = diff / (24 * 60 * 60 * 1000);

            System.out.print(diffDays + " days, ");
            System.out.print(diffHours + " hours, ");
            System.out.print(diffMinutes + " minutes, ");
            System.out.print(diffSeconds + " seconds.");

        } catch (Exception e) {
            e.printStackTrace();
        }

Answer 2

请检查下面的代码可能对你有用

public static String getAgoTime(String p_date, SimpleDateFormat p_dateFormat) throws Throwable {
        String message_Time = "";
        // SimpleDateFormat m_dateFormater = new SimpleDateFormat(p_dateFormat);
        Date m_currentdate = Calendar.getInstance().getTime();
        String m_today = p_dateFormat.format(m_currentdate);
        Date showTime = p_dateFormat.parse(p_date);
        Date server_date = new SimpleDateFormat(Constants.SHOW_DATE_FORMAT).parse(p_date);
        Date today_date = new SimpleDateFormat(Constants.SHOW_DATE_FORMAT).parse(m_today);

        long m_diff = today_date.getTime() - server_date.getTime();

        int hours = (int) (m_diff / (1000 * 60 * 60));
        int mins = (int) ((m_diff / (1000 * 60)) % 60);
        if (server_date.compareTo(today_date) == 0) {
/*
            if (hours == 0) {
                message_Time = String.valueOf(mins + " mins ago");
            } else if (hours > 1 && hours < 23) {
                message_Time = new SimpleDateFormat("hh:mm a").format(m_date1);
            }
*/
            message_Time = new SimpleDateFormat(Constants.SHOW_TIME_FORMAT).format(showTime);

        } else if (server_date.compareTo(today_date) < 0) {
            message_Time = new SimpleDateFormat(Constants.SHOW_INDEX_DATE).format(server_date);
        }
        return message_Time;
    }

Answer 3

希望这会有所帮助。

private long getTimesAgo(String dateValue){
        try{
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
            sdf.setTimeZone(TimeZone.getTimeZone(Constants.DateFormat.GMT));

        long time = sdf.parse(dateValue).getTime();
        long now = System.currentTimeMillis();

        CharSequence ago = DateUtils.getRelativeTimeSpanString(time, now, DateUtils.MINUTE_IN_MILLIS);
        return ago.toString();

        }catch (Exception e){
            return 0;
        }
    }