撤銷或者阻止鬧鐘響起

需求：在客戶apk啓動後，設置的鬧鐘要取消掉。

當鬧鐘要響起時會發送一些廣播，這些廣播是在AlarmService.java中處理的，包括：
ALARM_ALERT_ACTION 、ALARM_DISMISS_ACTION 、ALARM_SNOOZE_ACTION、CHANGE_STATE_ACTION
所以，要阻斷鬧鐘需要在 public int onStartCommand(）方法中取消掉stopCurrentAlarm；

            case AlarmStateManager.CHANGE_STATE_ACTION:
                AlarmStateManager.handleIntent(this, intent);
                    // If state is changed to firing, actually fire the alarm!
                    final int alarmState = intent.getIntExtra(
                        AlarmStateManager.ALARM_STATE_EXTRA, -1);
+					if(XXXX){
+						stopCurrentAlarm();
+						stopSelf();
+						break;
+				}