在ROOM数据库中将arrayList绑定到observeForever（）或observe（）方法

Question

我们如何在ROOM数据库arrayList或observeForever()方法中绑定observe()

 notificationModelArrayList = new ArrayList<>();
        NotificationRepository notificationRepository = new NotificationRepository(getApplicationContext());
        notificationRepository.getAllNotification().observe(NotificationActivity.this,new Observer<List<Notification>>() {
            @Override
            public void onChanged(@Nullable List<Notification> notifications) {
                for (org.jembi.careconekta.dbTables.Notification notification : notifications) {
                    System.out.println("-----------------------");
                    System.out.println(notification.getTitle());
                    System.out.println(notification.getMessage());
                    NotificationModel notificationModel = new NotificationModel();
                    notificationModel.setNotificationMsg(notification.getMessage());
                    notificationModelArrayList.add(notificationModel);
                }
            }
        });

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System.out.println可以正常工作，但是notificationModel中没有添加notificationModelArrayList