Android鬧鐘立即啓動

Question

爲什麼鬧鐘會立即起動而不是指定的時間？

Intent myIntent = new Intent(Notepad.this, MyAlarmService.class); 
PendingIntent pendingIntent = PendingIntent.getService(Notepad.this, 0, myIntent, 0); 

AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE); 
     Calendar calendar = Calendar.getInstance(); 
     calendar.setTimeInMillis(System.currentTimeMillis()); 
     calendar.set(Calendar.YEAR, 2012); 
     calendar.set(Calendar.MONTH, 4); 
     calendar.set(Calendar.DAY_OF_MONTH, 5); 
     calendar.set(Calendar.HOUR_OF_DAY, 10); 
     calendar.set(Calendar.MINUTE, 30); 
     calendar.set(Calendar.SECOND, 4); 
    alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent); 

如果我只使用calendar.add(Calendar.SECOND, 5);，它會在5秒鐘後啓動。根據尼古拉斯回答

SOLUTION

 Date dat = new Date();//initializes to now 
     Calendar cal_alarm = Calendar.getInstance(); 
     Calendar cal_now = Calendar.getInstance(); 
     cal_now.setTime(dat); 
     cal_alarm.setTime(dat); 
     cal_alarm.set(Calendar.HOUR_OF_DAY,Integer.valueOf(h)); 
     cal_alarm.set(Calendar.MINUTE, Integer.valueOf(m)); 
     cal_alarm.set(Calendar.SECOND,0); 

     if(cal_alarm.before(cal_now)){ 
      cal_alarm.add(Calendar.DATE,1); 
     } 

Answer 1

對我來說，似乎是要設置警告時間日曆時間和日期。也許設置兩個不同的日曆，並有一個用於當前時間，另一個用於鬧鐘時間。那有意義嗎？