Firebase查询参考中的limitToFirst在Android上不起作用 [英] limitToFirst in Firebase Query Reference not working on Android

问题描述

以下是我的firebase结构：

---

我正在使用的代码设置数据限制：

$ p $ @Override
public void onCreate（Bundled savedInstanceState）{
super.onCreate（savedInstanceState）;
getActivity（）。getWindow（）。setSoftInputMode（WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE）;
connectDetector = new ConnectDetector（getActivity（））;
if（connectDetector.getConnection（））{
alanRef = new Firebase（firebaseURL）.child（EventChatActivity.SuperCateName +/+ eventDetail.getCategory_name（）+/+ eventDetail.getEvent_title（） +/+ EventChatActivity.eventID）.child（StadiumChat）;
alanRef.limitToFirst（mPageLimit）.startAt（mPageEndOffset）;
userName = MyApp.preferences.getString（MyApp.USER_NAME，null）;




$ b $ p $这个代码给了我所有的孩子在那个特定的节点。



请建议应该加什么来限制它。

---

更新：

我已经给第一个添加限制，然后检查了设置OrderBy的文档。

所以我应该设定哪个顺序才能得到正确的结果。

我的网址： https://wazznow-cd155.firebaseio.com/Cricket/%20IPL/%20MI%20vs%20XXR/%20ABC123/StadiumChat.json?limitToFirst=10&orderBy=% 22％22& print = pretty

解决方案

p> limitToFirst将使用orderBy value.please使用orderBy与limitToFirst。

认罪从下面的URL检查。
https：/ /dinosaur-facts.firebaseio.com/dinosaurs.json?orderBy=%22height%22&limitToFirst=3&print=pretty

Below is my firebase structure:

---

Code I am using to set the limit to data :

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
    connectDetector = new ConnectDetector(getActivity());
    if(connectDetector.getConnection()) {
        alanRef = new Firebase(firebaseURL).child(EventChatActivity.SuperCateName + "/ " + eventDetail.getCategory_name() + "/ " + eventDetail.getEvent_title() + "/ " + EventChatActivity.eventID).child("StadiumChat");
        alanRef.limitToFirst(mPageLimit).startAt(mPageEndOffset);
        userName = MyApp.preferences.getString(MyApp.USER_NAME, null);

    }
}

This code gives me all the child in that specific node.

Please suggest what should be added to set limit to it.

---

Update:

I have added limit to First then I checked documentation which says set OrderBy also to it.

So in which order should I set to get the proper results.

My URL: https://wazznow-cd155.firebaseio.com/Cricket/%20IPL/%20MI%20vs%20XXR/%20ABC123/StadiumChat.json?limitToFirst=10&orderBy=%22%22&print=pretty

解决方案

manish

limitToFirst will work with orderBy value.please use orderBy with limitToFirst .

please check from below url. https://dinosaur-facts.firebaseio.com/dinosaurs.json?orderBy=%22height%22&limitToFirst=3&print=pretty

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