如何更新启动时的警报设置？

Question

我有一个警报，让我们在15点O'Clock说火。我在Boot completed Listener上开始报警，但我想让它每天15:00开火。但是，用户可以修改闹钟时间。问题是，一旦我修改它停止射击的闹钟时间。

以下是我的代码：

public class SystemBootListener extends BroadcastReceiver {
 @Override
  public void onReceive(Context context, Intent intent) {
     Toast.makeText(context,"SystemBootListener onReceive", Toast.LENGTH_SHORT).show();
            Intent i = new Intent(context, ConnectivityWatcher.class);

        PendingIntent pending = PendingIntent.getBroadcast(context, 0, i,0);

        long _alarm = 0;

        Calendar now = Calendar.getInstance();

        Calendar alarm = Calendar.getInstance();

        alarm.set(Calendar.HOUR_OF_DAY,Integer.parseInt(AppSettings.getAlarmHour(context)));
        int min=Integer.parseInt(AppSettings.getAlarmMin(context));
        alarm.set(Calendar.MINUTE,min);

        if(alarm.getTimeInMillis() <= now.getTimeInMillis())
            _alarm = alarm.getTimeInMillis() + (AlarmManager.INTERVAL_DAY+1);
        else
            _alarm = alarm.getTimeInMillis();  

        // Trigger every 10 seconds
        // InexactRepeating allows Android to optimize the energy consumption
        AlarmManager service = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        service.setInexactRepeating(AlarmManager.RTC_WAKEUP, _alarm, 5*1000, pending);
      }


 public void setAlarm(Context context) {
        //Toast.makeText(context,"Alarm Set by Activity"+       Integer.parseInt(AppSettings.getAlarmHour(context)) + ":"+   Integer.parseInt(AppSettings.getAlarmMin(context)),Toast.LENGTH_SHORT).show();
        Intent intent = new Intent(context, ConnectivityWatcher.class);
        PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent,0);

        long _alarm = 0;

        Calendar now = Calendar.getInstance();

        Calendar alarm = Calendar.getInstance();

        alarm.set(Calendar.HOUR_OF_DAY,Integer.parseInt(AppSettings.getAlarmHour(context)));
        int min=Integer.parseInt(AppSettings.getAlarmMin(context));
        alarm.set(Calendar.MINUTE,min);

        if(alarm.getTimeInMillis() <= now.getTimeInMillis())
            _alarm = alarm.getTimeInMillis() + (AlarmManager.INTERVAL_DAY+1);

        else
            _alarm = alarm.getTimeInMillis();  
        // InexactRepeating allows Android to optimize the energy consumption
        AlarmManager service = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        service.setInexactRepeating(AlarmManager.RTC_WAKEUP,_alarm,5*1000, pi);
        //service.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),  , pi); 


        Toast.makeText(context,alarm.get(Calendar.HOUR_OF_DAY)+" :"+alarm.get(Calendar.MINUTE), Toast.LENGTH_SHORT).show();
    }

    public void cancelAlarm(Context context) {
        Intent intent = new Intent(context, ConnectivityWatcher.class);
        PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.cancel(sender);

    }

    public void setOnetimeTimer(Context context) {
        AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(context, ConnectivityWatcher.class);
        //intent.putExtra(ONE_TIME, Boolean.TRUE);
        PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent, 0);
        am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), pi);
    }

}