ParseLiveQuery的问题

Question

我进行了一个解析查询，现在我需要实现实时查询。但是我的查询有一个List<ParseObject>，在这里的liveQuery方法中我发现它是不同的。

        public void onEvent(ParseQuery<ParseObject> query, final ParseObject object) {

ParseQuery是此方法的功能-请参阅我之前的post）来查看。

这是文档中建议的代码：

if (parseLiveQueryClient != null) {
ParseQuery<ParseObject> parseQuery = new ParseQuery("Message");
parseQuery.whereEqualTo("destination", "pokelist");
SubscriptionHandling<ParseObject> subscriptionHandling = parseLiveQueryClient.subscribe(parseQuery);

subscriptionHandling.handleEvent(SubscriptionHandling.Event.CREATE, new SubscriptionHandling.HandleEventCallback<ParseObject>() {
    @Override
    public void onEvent(ParseQuery<ParseObject> query, final ParseObject object) {
        Handler handler = new Handler(Looper.getMainLooper());
        handler.post(new Runnable() {
            public void run() {
                EditText pokeText = findViewById(R.id.pokeText);
                numPokes++;
                if(numPokes == 1) {
                    pokeText.setText("Poked " + numPokes + " time.");
                }
                else {
                    pokeText.setText("Poked " + numPokes + " times.");
                }
            }
        });
    }
});}

我这样做了，并确实更新了我的消息列表。有什么建议么？我是解析新手，很困惑！

 ParseQuery<ParseObject> query = ParseQuery.getQuery("Conversaciones");
        queryChat = ParseObject.createWithoutData("Chat", idChatSeleccionadoAppUsuario);
        query.whereEqualTo("ChatId", queryChat);
        query.include("Usuario");
        query.include("ChatId");
        SubscriptionHandling<ParseObject> subscriptionHandling= App.parseLiveQueryClient.subscribe(query);
        subscriptionHandling.handleEvent(SubscriptionHandling.Event.CREATE, new SubscriptionHandling.HandleEventCallback<ParseObject>() {
            @Override
            public void onEvent(final ParseQuery<ParseObject> query, final ParseObject object) {
                Handler handler = new Handler(Looper.getMainLooper());
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        listaDeMensajes.add(object);
                    }

                });

                mMessageAdapter = new MessageListAdapter(getContext(), listaDeMensajes);
                mMessageRecycler.setAdapter(mMessageAdapter);
                queryFromChat();

            }
        });

Answer 1

我解决了我的问题，这就是...

首先像这样进行订阅。

private void  changeChatLive(){
    listaDeMensajes.clear();
    ParseQuery<ParseObject> query = ParseQuery.getQuery("Conversaciones");
    // Connect to Parse server
    SubscriptionHandling<ParseObject> subscriptionHandling = parseLiveQueryClient.subscribe(query);

    // Listen for CREATE events
    subscriptionHandling.handleEvent(SubscriptionHandling.Event.CREATE, new
            SubscriptionHandling.HandleEventCallback<ParseObject>() {
                @Override
                public void onEvent(ParseQuery<ParseObject> query, ParseObject object) {

                    Handler handler = new Handler(Looper.getMainLooper());
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            mMessageAdapter.notifyDataSetChanged();
                            mMessageRecycler.scrollToPosition(0);
                        }

                    });
                }
            });
}

然后，我在这里调用该方法，然后运行liveChat。注意：在需要实时查询更新的地方调用方法。

                queryConversaciones();
                mMessageAdapter.notifyDataSetChanged();
                **changeChatLive();**