计算两个日期选择器之间的秒差

Question

我试着遵循这里的建议：

android calculating time difference for setting alarm

这就是我所做的:

    Calendar start = Calendar.getInstance();
    start.set(Calendar.HOUR_OF_DAY, timeSchedule.getCurrentHour());
    start.set(Calendar.MINUTE, timeSchedule.getCurrentMinute());

    Calendar end = Calendar.getInstance();
    end.set(Calendar.HOUR_OF_DAY, toTime.getCurrentHour());
    end.set(Calendar.MINUTE, toTime.getCurrentMinute());

    long startMillis = start.getTimeInMillis();
    long endMillis = end.getTimeInMillis();
    long diffSec = TimeUnit.MILLISECONDS.toSeconds(endMillis - startMillis);

其中 toTime 和 timeSchedule 是 TimePicker。但是，结果不正确。我怀疑是因为 AM 和 PM.

请帮助我，非常感谢你的帮助。

更新

感谢@Raghunandan，这是我当前的代码：

    Calendar start = Calendar.getInstance();
    start.set(Calendar.HOUR, timeSchedule.getCurrentHour());
    start.set(Calendar.MINUTE, timeSchedule.getCurrentMinute());

    if (start.get(Calendar.AM_PM) == Calendar.AM)
        start.set(Calendar.AM_PM, Calendar.AM);
    else
        start.set(Calendar.AM_PM, Calendar.PM);

    Calendar end = Calendar.getInstance();
    end.set(Calendar.HOUR, toTime.getCurrentHour());
    end.set(Calendar.MINUTE, toTime.getCurrentMinute());

    if (end.get(Calendar.AM_PM) == Calendar.AM)
        end.set(Calendar.AM_PM, Calendar.AM);
    else
        end.set(Calendar.AM_PM, Calendar.PM);

    long startMillis = start.getTimeInMillis();
    long endMillis = end.getTimeInMillis();
    long diffSec = TimeUnit.MILLISECONDS.toSeconds(endMillis - startMillis);

现在如果两个 Timpickers 都是上午或下午，结果为真。但是，如果用户将晚上 7 点设置为凌晨 1 点，则结果将为假（<0 或负值）。我该怎么办？

Answer 1

尝试

Calendar start = Calendar.getInstance();
start.set(Calendar.HOUR, 6);
start.set(Calendar.MINUTE, 30);
start.set(Calendar.AM_PM,Calendar.AM);

Calendar end = Calendar.getInstance();
end.set(Calendar.HOUR, 6); // 12 hour format
end.set(Calendar.MINUTE, 30);
end.set(Calendar.AM_PM,Calendar.PM); // AM or PM

long startMillis = start.getTimeInMillis();
long endMillis = end.getTimeInMillis();
long diffSec = TimeUnit.MILLISECONDS.toSeconds(endMillis) - TimeUnit.MILLISECONDS.toSeconds(startMillis) ;
long diffHour = TimeUnit.MILLISECONDS.toHours(endMillis) - TimeUnit.MILLISECONDS.toHours(startMillis) // 12 hour diff

使用 Calendar.Hour 表示 12 小时制，Calendar.HOUR_OF_DAY 表示 24 小时制。

http://developer.android.com/reference/java/util/Calendar.html#AM_PM

http://developer.android.com/reference/java/util/Calendar.html#HOUR

编辑：

晚上 7 点到次日凌晨 1 点

Calendar start = Calendar.getInstance();
start.set(Calendar.HOUR, 7);
start.set(Calendar.MINUTE, 30);
start.set(Calendar.AM_PM,Calendar.PM);

Calendar end = Calendar.getInstance();
int day = (start.get(Calendar.DAY_OF_MONTH)+1);
end.set(Calendar.DAY_OF_MONTH,day);
end.set(Calendar.HOUR, 1);
end.set(Calendar.MINUTE, 30);
end.set(Calendar.AM_PM,Calendar.AM);

long startMillis = start.getTimeInMillis();
long endMillis = end.getTimeInMillis();
long diffSec = TimeUnit.MILLISECONDS.toSeconds(endMillis) - TimeUnit.MILLISECONDS.toSeconds(startMillis) ;
long diffHour = TimeUnit.MILLISECONDS.toHours(endMillis) - TimeUnit.MILLISECONDS.toHours(startMillis) ;

编辑 2：

Calendar start = Calendar.getInstance();
start.set(Calendar.HOUR_OF_DAY, 21);
start.set(Calendar.MINUTE, 30);

if (start.get(Calendar.AM_PM) == Calendar.AM)
        start.set(Calendar.AM_PM, Calendar.AM);
else
        start.set(Calendar.AM_PM, Calendar.PM);

Calendar end = Calendar.getInstance();
end.set(Calendar.HOUR_OF_DAY, 4);
end.set(Calendar.MINUTE, 30);
int day = (start.get(Calendar.DAY_OF_MONTH)+1);
end.set(Calendar.DAY_OF_MONTH,day);

if (end.get(Calendar.AM_PM) == Calendar.AM)
        end.set(Calendar.AM_PM, Calendar.AM);
else
        end.set(Calendar.AM_PM, Calendar.PM);

long startMillis = start.getTimeInMillis();
long endMillis = end.getTimeInMillis();
long diffSec = TimeUnit.MILLISECONDS.toSeconds(endMillis - startMillis);
long diffHour = TimeUnit.MILLISECONDS.toHours(endMillis) - TimeUnit.MILLISECONDS.toHours(startMillis) ;

Toast.makeText(this,""+diffHour, Toast.LENGTH_LONG).show();

注意：您可能还需要日期选择器。

计算两个日期选择器之间的秒差

Calculate different seconds between two Timepickers

time

datetime

android