java - 使用 Parse LiveQuery (Android) 增量列表？

Question

我正在尝试使用此库实时显示数据库中出现的新对象的数量:https://github.com/parse-community/ParseLiveQuery-Android .

我正在监听“通知”类中出现的新对象。每次创建新通知时，如何在下面的 StringHolder 中增加该值？我认为用户界面是否更新是另一个故事。但我至少可以实时增加该列表吗？

ParseLiveQueryClient parseLiveQueryClient = ParseLiveQueryClient.Factory.getClient();
ParseQuery < ParseObject > parseQuery = ParseQuery.getQuery(ParseConstants.CLASS_NOTIFICATIONS);
parseQuery.whereEqualTo(ParseConstants.KEY_READ_STATE, false);
SubscriptionHandling < ParseObject > subscriptionHandling = parseLiveQueryClient.subscribe(parseQuery);
subscriptionHandling.handleEvents(new SubscriptionHandling.HandleEventsCallback < ParseObject > () {
 @Override
 public void onEvents(ParseQuery < ParseObject > query, SubscriptionHandling.Event event, ParseObject object) {
  // HANDLING all events
  List<ParseObject> newNotifications = new ArrayList<>();
  newNotifications.add(object);
  Log.w(getLocalClassName(), "New notification found! " + object.toString());
  result.updateBadge(5, new StringHolder(newNotifications.size() + ""));
 }
});

Answer 1

我认为您每次发出 onEvent 时都会声明 newNotifications 变量。尝试将此行放在共享上下文中，例如 Activity 或单例:

List<ParseObject> newNotifications = new ArrayList<>();