android - 每天准确重复报警(报警管理器)

Question

我设置了每天重复的闹钟。但它会有几秒钟或几分钟的错误。我怎样才能使它更准确？

PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), notificationId, myIntent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager)getActivity().getSystemService(Context.ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 12);
calendar.set(Calendar.MINUTE, 30);
long startUpTime = calendar.getTimeInMillis();
if (System.currentTimeMillis() > startUpTime) {
    startUpTime = startUpTime + 24*60*60*1000;
}
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, startUpTime,  24*60*60*1000 , pendingIntent);

Answer 1

尝试添加

calendar.set(Calendar.SECOND,00);

和改变

alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, startUpTime,  24*60*60*1000 , pendingIntent);

到

alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
            startUpTime, AlarmManager.INTERVAL_DAY, pendingIntent);