在Java中将整数日期/时间转换为unix时间戳？

Question

这主要适用于android,但可以在Java中使用.我有这些听众:

int year, month, day, hour, minute;
// the callback received when the user "sets" the date in the dialog
private DatePickerDialog.OnDateSetListener mDateSetListener =
        new DatePickerDialog.OnDateSetListener() {

            public void onDateSet(DatePicker view, int year, 
                                  int monthOfYear, int dayOfMonth) {
                year = year;
                month = monthOfYear;
                day = dayOfMonth;
            }
        };
// the callback received when the user "sets" the time in the dialog
private TimePickerDialog.OnTimeSetListener mTimeSetListener =
    new TimePickerDialog.OnTimeSetListener() {
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            hour = hourOfDay;
            minute = minute;
        }
    };

我怎么能转换int year, month, day, hour, minute;为unix时间戳？没有Date班级这可能吗？

Answer 1

好吧,然后使用日历,因为这仍然是日期的首选:

int componentTimeToTimestamp(int year, int month, int day, int hour, int minute) {

    Calendar c = Calendar.getInstance();
    c.set(Calendar.YEAR, year);
    c.set(Calendar.MONTH, month);
    c.set(Calendar.DAY_OF_MONTH, day);
    c.set(Calendar.HOUR, hour);
    c.set(Calendar.MINUTE, minute);
    c.set(Calendar.SECOND, 0);
    c.set(Calendar.MILLISECOND, 0);

    return (int) (c.getTimeInMillis() / 1000L);
}

getTimeMillis()在调用之前,日历不会进行任何计算,并且旨在提高效率Date.