如何在android中获得2次的区别

Question

我想找出当前系统时间与插入数据和时间之间的差异String.我试过这个:

 try {

            String strFileDate = "2012-04-19 15:15:00";
            DateFormat formatter2 = new SimpleDateFormat("yyyy-mm-dd hh:mm:ss");
            Date date = formatter2.parse(strFileDate);
            long difference = date.getTime() - System.currentTimeMillis();
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(difference);
            Toast.makeText(getBaseContext(),
                    formatter2.format(calendar.getTime()), Toast.LENGTH_LONG)
                    .show();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 

但它没有给我正确的结果.我做得对吗？

更新

我试着跟着::

String strFileDate = "2012-04-19 15:15:00";
            DateFormat formatter2 = new SimpleDateFormat("yyyy-mm-dd hh:mm:ss");
            Date date = formatter2.parse(strFileDate);
            long diffInMs = date.getTime()
                    - new Date(System.currentTimeMillis()).getTime();

            long diffInSec = TimeUnit.MILLISECONDS.toSeconds(diffInMs);

            long hour = diffInSec / (1000 * 60 * 60);
            double minutes = diffInSec / (1000 * 60);
            // long diffInHour = TimeUnit.to(diffInMs);

            Toast.makeText(getBaseContext(),
                    "left time is :: " + hour + ":" + minutes,
                    Toast.LENGTH_LONG).show();

output :: left time是:: -2:-131.0

更新(20/4/2012)

try {
            Date dt = new Date();
            String strFileDate = "2012-04-20 13:10:00";
            DateFormat formatter2 = new SimpleDateFormat("yyyy-mm-dd hh:mm:ss");
            Date date = formatter2.parse(strFileDate);
            String s = getTimeDiff(dt, date);
            Log.i("Date is :: >>> ", s);
        } catch (Exception e) {
            e.printStackTrace();
        }
 public String getTimeDiff(Date dateOne, Date dateTwo) {
        String diff = "";
        long timeDiff = Math.abs(dateOne.getTime() - dateTwo.getTime());
        diff = String.format("%d hour(s) %d min(s)", TimeUnit.MILLISECONDS.toHours(timeDiff),
                TimeUnit.MILLISECONDS.toMinutes(timeDiff) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(timeDiff)));
        return diff;

}

输出:: 04-20 12:48:06.629:信息/日期是:: >>>(1295):2183小时38分钟

Answer 1

String strFileDate = "2012-04-19 15:15:00";
DateFormat formatter2 = new SimpleDateFormat("yyyy-mm-dd hh:mm:ss");
Date date = formatter2.parse(strFileDate);
long diffInMs = date.getTime() - new Date(System.currentTimeMillis()).getTime();


long diffInSec = TimeUnit.MILLISECONDS.toSeconds(diffInMis);

long diffInHour = TimeUnit.MILLISECONDS.toHours(diffInMis);

使用TimeUnit获取秒数. http://developer.android.com/reference/java/util/concurrent/TimeUnit.html

编辑:

在这里获取TIMEUNIT代码

public String getTimeDiff(Date dateOne, Date dateTwo) {
        String diff = "";
        long timeDiff = Math.abs(dateOne.getTime() - dateTwo.getTime());
        diff = String.format("%d hour(s) %d min(s)", TimeUnit.MILLISECONDS.toHours(timeDiff),
                TimeUnit.MILLISECONDS.toMinutes(timeDiff) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(timeDiff)));
        return diff;
}