Question

请帮助，我正在尝试从FaceBook中检索也使用应用程序的朋友列表。我收到列表并显示数据，但我的适配器不会使列表视图膨胀。所有id都是正确的，Log标签显示我需要的内容，但视图不会膨胀。以下是相关代码：

查看适配器：

package com.example.sca.ihavebeen;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import org.json.JSONArray;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Tom Schinler on 9/10/2015.
 */
public class FriendsViewAdapter extends ArrayAdapter<FaceBookFriends> {
    public FriendsViewAdapter(Context context, JSONArray friends) {
        super(context,0);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        FaceBookFriends friend = getItem(position);

        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.fb_friends_layout, parent);
        }
        TextView fbName = (TextView)convertView.findViewById(R.id.fbName);
        ImageView fbPic = (ImageView)convertView.findViewById(R.id.fbPic); // Not yet ready to handle this
        fbName.setText(friend.name);


        return convertView;
    }
}

这是列表应该膨胀的视图：

package com.example.sca.ihavebeen;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;

import com.facebook.AccessToken;
import com.facebook.GraphRequest;
import com.facebook.GraphResponse;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

public class GameStart extends AppCompatActivity {

    JSONArray mArrayofFriends;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_game_start);



        mArrayofFriends = FaceBookFriends.getFriendsList();


        Log.v("maybe ", String.valueOf(mArrayofFriends));

        populateFbFriendsList();

    }

    private void populateFbFriendsList() {

        FriendsViewAdapter adapter = new FriendsViewAdapter(this, mArrayofFriends);

        ListView listView = (ListView) findViewById(R.id.fbFriendsListView);
        listView.setAdapter(adapter);
    }




}

只是为了踢，这里是调用图响应的类：

package com.example.sca.ihavebeen;

import android.util.Log;

import com.facebook.AccessToken;
import com.facebook.GraphRequest;
import com.facebook.GraphResponse;

import org.json.JSONArray;

/**
 * Created by Tom Schinler on 8/4/2015.
 */
public class FaceBookFriends {




    public static JSONArray mFriendsList;
    public String name;
    public String id;




    public static JSONArray getFaceBookFriends() {
        AccessToken accessToken = AccessToken.getCurrentAccessToken();
        GraphRequest request = GraphRequest.newMyFriendsRequest(
                accessToken,
                new GraphRequest.GraphJSONArrayCallback() {
                    @Override
                    public void onCompleted(JSONArray array, GraphResponse response) {
                        // Insert your code here

                        mFriendsList = array;
                        Log.v("Array: ", String.valueOf(mFriendsList));
                        Log.v("Facebook response: ", String.valueOf(response));

                    }
                });

        request.executeAsync();




        return mFriendsList;

    }

    public static JSONArray getFriendsList() {
        return mFriendsList;
    }

    public FaceBookFriends(String name, String id){
        this.name = name;
        this.id = id;
    }

}

请帮我解决这个问题！

Answer 1

您可能需要覆盖getCount，以便列表知道适配器中实际有多少个对象。否则就不会有任何问题。

Answer 2

您正在使用ArrayAdapter<FaceBookFriends>而未设置数组：

public FriendsViewAdapter(Context context, JSONArray friends) {
    super(context,0);
}

相反，您应该Convert Json Array to normal Java Array或更精确List<FaceBookFriends>并将其设置在构造函数中：

public FriendsViewAdapter(Context context, JSONArray friends) {
    super(context,0,convertJSONArray2List(friends));
}

列表视图不会膨胀

2 个答案: