Android闹钟立即启动

Question

为什么闹钟会立即起动而不是指定的时间？

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);，它会在5秒钟后启动。根据尼古拉斯回答

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

对我来说，似乎是要设置警告时间日历时间和日期。也许设置两个不同的日历，并有一个用于当前时间，另一个用于闹钟时间。那有意义吗？