android - executeAsync Facebook android SDK

Question

我正在调用 request.executeAnsyc 以用信息填充我的数组并显示在 ListView 上。遗憾的是，在 request.executeAnsyc 完成之前调用了数组。所以我的 Fragment 的 CreatView 方法上没有显示任何内容。

有没有办法在 request.executeAnsyc 完成后使用数组并在 ListView 上显示信息？!

最好的问候。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.kizombalistfestival,
            container, false);
    listUsersInformation = new ArrayList<UserInfo>();

            // TODO Auto-generated method stub

            Session session = Session.getActiveSession();
            new Request(session, "/me", null, HttpMethod.GET,
                    new Request.Callback() {
                        public void onCompleted(Response response) {

                            /* handle the result */

                            String serverresponse = response
                                    .getGraphObject().getInnerJSONObject()
                                    .toString();
                            Log.e("serverresponse", "" + serverresponse);
                            JSONObject jsonobj;

                            try {

                                jsonobj = new JSONObject(serverresponse);
                                UserInfo temp = new UserInfo(jsonobj
                                        .getString("id"), jsonobj
                                        .getString("first_name"), jsonobj
                                        .getString("gender"), jsonobj
                                        .getString("last_name"), jsonobj
                                        .getString("link"), jsonobj
                                        .getString("locale"), jsonobj
                                        .getString("name"), jsonobj
                                        .getString("timezone"), jsonobj
                                        .getString("updated_time"), jsonobj
                                        .getString("verified"));

                                listUsersInformation.add(temp);




                            } catch (JSONException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }

                        }
                    }).executeAsync();




        list = (ListView) rootView.findViewById(R.id.list_festivals);
        list.setAdapter(new ArrayAdapter<UserInfo>(getActivity(),
                android.R.layout.simple_list_item_1, listUsersInformation));



    return rootView;

}

Answer 1

我可以想到两种方法来实现它。

<强>1。在 finally block 中使用处理程序更新 ListView

new Request(session, "/me", null, HttpMethod.GET,
                new Request.Callback() {
                    public void onCompleted(Response response) {

                        /* handle the result */

                        String serverresponse = response
                                .getGraphObject().getInnerJSONObject()
                                .toString();
                        Log.e("serverresponse", "" + serverresponse);
                        JSONObject jsonobj;

                        try {

                            jsonobj = new JSONObject(serverresponse);
                            UserInfo temp = new UserInfo(jsonobj
                                    .getString("id"), jsonobj
                                    .getString("first_name"), jsonobj
                                    .getString("gender"), jsonobj
                                    .getString("last_name"), jsonobj
                                    .getString("link"), jsonobj
                                    .getString("locale"), jsonobj
                                    .getString("name"), jsonobj
                                    .getString("timezone"), jsonobj
                                    .getString("updated_time"), jsonobj
                                    .getString("verified"));

                            listUsersInformation.add(temp);




                        } catch (JSONException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        } finally {
                            // add your code here
                            handler.post(new Runnable(){
                                @Override
                                public void run(){
                                       list = (ListView)rootView.findViewById(R.id.list_festivals);
                                   list.setAdapter(new ArrayAdapter<UserInfo>(getActivity(),
            android.R.layout.simple_list_item_1, listUsersInformation));
                                }
                            });
                        }

                    }
                }).executeAsync();

<强>2。使用广播接收器

首先，您应该在要更新 ListView 的 fragment 中注册接收器。然后，在您的 Facebook 函数类中，将 Broadcast(intent) 发送到您注册的 fragment ，如下所示:

// your fb request callback
try {

    jsonobj = new JSONObject(serverresponse);
    Intent intent = new Intent(DISPLAY_MESSAGE_ACTION);
    intent.putExtra("id", id);
    intent.putExtra("first_name", first_name);
    intent.putExtra("gender", gender);
    intent.putExtra("last_name", last_name);
    // ... and so on  
    context.sendBroadcast(intent);
}

最终，在您注册了 broadcastreceiver 的 fragment 中，

private final BroadcastReceiver streamReceiver = new    BroadcastReceiver(){
    @Override
    public void onReceive(Context context, Intent intent){

        ///Waking up mobile of it is sleeping
        WakeLocker.acquire(getActivity().getApplicationContext());
        String id = intent.getExtras().getString("id");
        String first_name = intent.getExtras().getString("first_name");     
        String gender = intent.getExtras().getInt("gender");
        ...
        ...
        UserInfo temp = new UserInfo(id, 
                                     first_name,
                                     gender, .....);

        listUsersInformation.add(temp);            

        yourAdapter.notifyDataSetChanged();


        WakeLocker.release();
    }
};