在Facebook中的onComplete调用setAdapter [英] Calling setAdapter in Facebook onComplete

问题描述

我使用Facebook的API，我有一个很难得到一个的ListView 显示的数据。我的code使用碎片和膨胀，有一个的ListView 作为根布局。这的ListView 被包裹在另一个 PullToRefreshListView 启用的拉来刷新。我还包裹适配器，以便它可以使用马克·墨菲的无尽适配器。如果我在创建片段前加载所有Facebook数据，一切正常。但我想创建一个空的的ListView 片段，并填充它，一旦我得到Facebook的数据不同步。

我使用了的onComplete（响应响应）在Facebook的回调方法请求，但似乎我不能使用 setAdapter（适配器）的 onCreateView（）方法之外的某些原因。我觉得我只是失去了一些东西很简单。这里的code：

  JSONArray新闻推送;
查看视图。
ListView的feedList;
PullToRefreshListView refreshFeedList;请求initialFeedRequest =新的请求（会话，我的/ home，空，HttpMethod.GET，新Request.Callback（）{    @覆盖
    公共无效onCompleted（响应响应）{
        Log.i（新闻源，初始加载的onComplete）;
        Log.i（新闻推送，response.toString（））;
        responseObject = response.getGraphObject（）getInnerJSONObject（）。
        尝试{
            新闻源= responseObject.getJSONArray（数据）;
        }赶上（JSONException E）{
            e.printStackTrace（）;
        }
        feedAdapter =新FeedAdapter（getActivity（），Space.newsFeed）;
        endlessAdapter =新EndlessFeed（feedAdapter）;
        feedList.setAdapter（endlessAdapter）;
        refreshFeedList.setOnRefreshListener（refreshListener）;
        nextPageRequest = response.getRequestForPagedResults（PagingDirection.NEXT）;
        字符串测试= feedAdapter.getItem（0）的ToString（）;
        Log.i（新闻推送，第一项：+测试）;
    }
}）;公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，捆绑savedInstanceState）{
    super.onCreateView（充气器，容器，savedInstanceState）;
    鉴于= inflater.inflate（R.layout.news_feed，集装箱，FALSE）;
    如果（feedAdapter == NULL）{
        Log.i（新闻推送，执行请求）;
        initialFeedRequest.executeAsync（）;
    }
    其他{
        feedAdapter =新FeedAdapter（getActivity（），Space.newsFeed）;
        endlessAdapter =新EndlessFeed（feedAdapter）;
        feedList.setAdapter（endlessAdapter）;
        refreshFeedList.setOnRefreshListener（refreshListener）;
    }
    refreshFeedList =（PullToRefreshListView）view.findViewById（R.id.feedList）;
    feedList = refreshFeedList.getRefreshableView（）;
    feedList.setDividerHeight（0）;
}
 

解决方案

这是发生，因为

  refreshFeedList =（PullToRefreshListView）view.findViewById（R.id.feedList）;
feedList = refreshFeedList.getRefreshableView（）;
feedList.setDividerHeight（0）;
 

这code为前执行：

  feedList.setAdapter（endlessAdapter）;
 

在的onComplete。
因为你在呼吁 initialFeedRequest.executeAsync（）; ，这意味着该请求是在UI线程旁边有一个不同的线程执行。 u必须执行

  refreshFeedList =（PullToRefreshListView）view.findViewById（R.id.feedList）;
feedList = refreshFeedList.getRefreshableView（）;
feedList.setDividerHeight（0）;
 

在的onComplete 完成其工作。

和另外一件事，U应返回从 onViewCreate（）视图，因为它的返回类型是查看

编辑：

把你的 responseObject 共享preference在 onCopmlete ：

 共享preferences preFS = preferenceManager.getDefaultShared preferences（getActivity（））;
共享preferences.Editor编辑器= prefs.edit（）;
editor.putString（responseObject，responseObject.toString（））;
editor.commit（）;
 

getback你的 responseObject 中的其他条件：

 的JSONObject responseObject;
共享preferences preFS = preferenceManager.getDefaultShared preferences（getActivity（））;
字符串responseObjectString = prefs.getString（responseObject）;
如果（responseObjectString！= NULL）
    responseObject =新的JSONObject（responseObjectString）;
新闻源= responseObject.getJSONArray（数据）;feedAdapter =新FeedAdapter（getActivity（），新闻推送）; //使用我们从SP获取新闻源
endlessAdapter =新EndlessFeed（feedAdapter）;
feedList.setAdapter（endlessAdapter）;
refreshFeedList.setOnRefreshListener（refreshListener）;
 

如果ü要使用应用程序类，然后看到：
应用类教程

然后我只好也改变你的清单：

 ＆lt;应用
   机器人：标签=@字符串/ APP_NAME
   机器人：allowBackup =真
   机器人：图标=@绘制/ ic_launcher
   机器人：名字=Your_Application_class_name。＆GT;
//其他组件。 ....＆LT; /用途＆gt;
 

I'm using the Facebook API and I'm having a hard time getting a ListView to show data. My code uses fragments and inflates a layout that has a ListView as the root. That ListView is wrapped in another PullToRefreshListView to enable Pull To Refresh. I'm also wrapping the adapter so it can use Mark Murphy's Endless Adapter. If I load all the Facebook data before creating the fragment, everything works. But I want to create the fragment with an empty ListView and populate it once I get the Facebook data asynchronously.

I'm using the onComplete(Response response) callback method in the Facebook Request, but it seems that I can't use setAdapter(adapter) outside of the onCreateView() method for some reason. I feel like I'm just missing something really simple. Here's the code:

JSONArray newsFeed;
View view;
ListView feedList;
PullToRefreshListView refreshFeedList;

Request initialFeedRequest = new Request(session, "me/home", null, HttpMethod.GET, new Request.Callback() {

    @Override
    public void onCompleted(Response response) {
        Log.i("NewsFeed", "initial load onComplete");
        Log.i("NewsFeed",response.toString());
        responseObject = response.getGraphObject().getInnerJSONObject();
        try {
            newsFeed = responseObject.getJSONArray("data");
        } catch (JSONException e) {
            e.printStackTrace();
        }
        feedAdapter = new FeedAdapter(getActivity(), Space.newsFeed);
        endlessAdapter = new EndlessFeed(feedAdapter);
        feedList.setAdapter(endlessAdapter);
        refreshFeedList.setOnRefreshListener(refreshListener);
        nextPageRequest = response.getRequestForPagedResults(PagingDirection.NEXT);
        String test = feedAdapter.getItem(0).toString();
        Log.i("NewsFeed", "First Item: " + test);
    }
});

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    view = inflater.inflate(R.layout.news_feed, container, false);
    if(feedAdapter==null){
        Log.i("NewsFeed", "executing Request");
        initialFeedRequest.executeAsync();
    }
    else{
        feedAdapter = new FeedAdapter(getActivity(), Space.newsFeed);
        endlessAdapter = new EndlessFeed(feedAdapter);
        feedList.setAdapter(endlessAdapter);
        refreshFeedList.setOnRefreshListener(refreshListener);
    }
    refreshFeedList = (PullToRefreshListView) view.findViewById(R.id.feedList);
    feedList = refreshFeedList.getRefreshableView();
    feedList.setDividerHeight(0);
}

解决方案

this is happening because

refreshFeedList = (PullToRefreshListView) view.findViewById(R.id.feedList);
feedList = refreshFeedList.getRefreshableView();
feedList.setDividerHeight(0);

this code is executed before:

feedList.setAdapter(endlessAdapter);

in onComplete. cause u have called initialFeedRequest.executeAsync();, that means the request is executed in a different thread beside UI-Thread . u have to execute

refreshFeedList = (PullToRefreshListView) view.findViewById(R.id.feedList);
feedList = refreshFeedList.getRefreshableView();
feedList.setDividerHeight(0);

after onComplete done its job

and another thing, u should return a view from onViewCreate() because its return type is View

Edited:

put your responseObject in SharedPreference in onCopmlete:

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
SharedPreferences.Editor editor = prefs.edit();
editor.putString("responseObject", responseObject.toString());
editor.commit();

getback your responseObject in else condition:

JSONObject responseObject;
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
String responseObjectString = prefs.getString("responseObject");
if(responseObjectString != null) 
    responseObject = new JSONObject(responseObjectString);
newsFeed = responseObject.getJSONArray("data");

feedAdapter = new FeedAdapter(getActivity(), newsFeed); // use the newsFeed we get from SP
endlessAdapter = new EndlessFeed(feedAdapter);
feedList.setAdapter(endlessAdapter);
refreshFeedList.setOnRefreshListener(refreshListener);

if u want to use Application class then see: Application class tutorial

then u have to change your manifest also:

<application 
   android:label="@string/app_name"
   android:allowBackup="true"
   android:icon="@drawable/ic_launcher"
   android:name=".Your_Application_class_name">
// other components. ....

</application>

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