Android 从日历中获取一个月的毫秒数

如何从Calendar对象获取以毫秒为单位的时间，以便在Alarm Manager中设置间隔我正在使用以下代码：

am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), interval, sender);

我对一个月毫秒的

interval

的计算如下：

Calendar monthCal = Calendar.getInstance();
monthCal.clear();
monthCal.setTimeInMillis(System.currentTimeMillis());
monthCal.add(Calendar.MONTH, 1);

interval =  monthCal.getTimeInMillis();

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但我没有收到任何重复警报。

您可以执行以下操作：

Calendar c = Calendar.getInstance();
c.set(year,month,1); // Set the year and month you want milliseconds for
long daysInMonth = c.getActualMaximum(Calendar.DATE); //Get how many days this month have
long millisInMonth = daysInMonth*dayMillis; //Multiply the amount of days with how many milliseconds a day consists of (86400000L)