Java JSONObject未显示在Listview上

我试图获取一个JSONObject并在listview中显示。对对象的请求正在返回它应该返回的内容，代码的其余部分似乎不起作用

这是我的密码：

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.util.JsonReader;
import android.util.Log;
import android.view.MenuItem;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;


public class DisplayServiceActivity extends ListActivity {
    private ListView listOfServices;

    //JSONArrays?
    JSONArray directory;


    //JSON Node names
    private static String TAG_ID = "id";
    private static String TAG_NAME= "name";
    private static String TAG_DIRECTORY = "Categories";
    private final static String url= "APILINKHERE";
    JSONObject json;
    jsonParser jParser = new jsonParser();
    ArrayList<HashMap<String, String>> directoryList;

    @SuppressLint("NewApi")
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Request request = new Request();
        request.execute();

        listOfServices =getListView(); //get builtin listView


        directoryList = new ArrayList<HashMap<String, String>>();

        ListAdapter adapter = new SimpleAdapter(this,
                directoryList, 
                R.layout.list_item, 
                new String[] { TAG_ID,TAG_NAME }, 
                new int[] { android.R.id.text1,android.R.id.text2 });

        setListAdapter(adapter);
        setContentView(R.layout.service);
        // Make sure we're running on Honeycomb or higher to use ActionBar APIs
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            // Show the Up button in the action bar.
            getActionBar().setDisplayHomeAsUpEnabled(true);
        }
    }// end of onCreate Method
    @SuppressWarnings("unused")
    public class Request extends AsyncTask<String, Void, JSONObject> {

        private static final int REGISTRATION_TIMEOUT = 3 * 1000;
        private static final int WAIT_TIMEOUT = 30 * 1000;
        private ProgressDialog dialog = 
                new ProgressDialog(DisplayServiceActivity.this);


        protected void onPreExecute() {
            dialog = new ProgressDialog(DisplayServiceActivity.this);
            dialog.setMessage("Getting your info real quick... Please wait...");
            dialog.show();
        }

        protected JSONObject doInBackground(String... params) {

            json = jParser.getJSONfromURL(url);
            Log.e("JSON Variable", "json returns this value: " + json);

            return json;

        }

        protected void onPostExecute(JSONObject s) {          
            super.onPostExecute(s);

            dialog.dismiss();
            Log.e("Test JSON","JSON s returns: " + s);
            try {
                directory = s.getJSONArray("Categories");
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            for(int i = 0; i< directory.length(); i++){
                String str_id = directory.optString(i, "id");
                String str_name = directory.optString(i, "name");
                displayCatList(str_id, str_name);

                Log.e("Test directory","Directory returns: " + json);
            }

        }

    }

    public void displayCatList(String id, String name){                 

        //create new HashMap
        HashMap<String,String> map = new HashMap<String, String>();

        //add each child node to HashMap key
        map.put(TAG_ID, id);
        map.put(TAG_NAME, name);

        //adding HashList to ArrarList
        directoryList.add(map);


    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            NavUtils.navigateUpFromSameTask(this);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

import java.io.InputStream；
导入java.io.InputStreamReader；
导入java.io.Reader；
导入java.net.URL；
导入android.annotation.SuppressLint；
导入android.app.Activity；
导入android.app.ListActivity；
导入android.app.ProgressDialog；
导入android.content.Intent；
导入android.os.AsyncTask；
导入android.os.Build；
导入android.os.Bundle；
导入android.support.v4.app.NavUtils；
导入android.util.JsonReader；
导入android.util.Log；
导入android.view.MenuItem；
导入java.util.ArrayList；
导入java.util.HashMap；
导入java.util.List；
导入org.json.JSONArray；
导入org.json.JSONException；
导入org.json.JSONObject；
导入android.widget.ArrayAdapter；
导入android.widget.ListAdapter；
导入android.widget.ListView；
导入android.widget.simpledapter；
公共类DisplayServiceActivity扩展了ListActivity{
私有ListView listOfServices；
//JSONArrays？
JSONArray目录；
//JSON节点名称
私有静态字符串标记\u ID=“ID”；
私有静态字符串标记_NAME=“NAME”；
私有静态字符串TAG_DIRECTORY=“Categories”；
私有最终静态字符串url=“APILINKHERE”；
JSONObject json；
jsonParser jParser=新的jsonParser（）；
ArrayList目录列表；
@SuppressLint（“新API”）
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
请求=新请求（）；
request.execute（）；
listOfServices=getListView（）；//获取内置listView
directoryList=newarraylist（）；
ListAdapter=新的SimpleAdapter（此，
目录列表，
R.layout.list_项目，
新字符串[]{TAG_ID，TAG_NAME}，
新的int[]{android.R.id.text1，android.R.id.text2}）；
setListAdapter（适配器）；
setContentView（R.layout.service）；
//确保我们在蜂巢或更高版本上运行，以使用ActionBarAPI
if（Build.VERSION.SDK\u INT>=Build.VERSION\u code.HONEYCOMB）{
//在操作栏中显示“向上”按钮。
getActionBar（）.setDisplayHomeAsUpEnabled（true）；
}
}//onCreate方法的结束
@抑制警告（“未使用”）
公共类请求扩展异步任务{
私有静态最终整数注册\u超时=3*1000；
私有静态最终整数等待超时=30*1000；
private ProgressDialog对话框=
新建ProgressDialog（DisplayServiceActivity.this）；
受保护的void onPreExecute（）{
dialog=新建ProgressDialog（DisplayServiceActivity.this）；
setMessage（“快速获取您的信息…请稍候…”）；
dialog.show（）；
}
受保护的JSONObject doInBackground（字符串…参数）{
json=jParser.getJSONfromURL（url）；
Log.e（“JSON变量”，“JSON返回此值：”+JSON）；
返回json；
}
受保护的void onPostExecute（JSONObject s）{
super.onPostExecute（s）；
dialog.dismise（）；
Log.e（“testjson”，“JSON s返回：”+s）；
试一试{
directory=s.getJSONArray（“类别”）；
}捕获（JSONException e）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
对于（int i=0；i

日志：

05-12 17:26:33.165: I/Adreno200-EGLSUB(10190): <ConfigWindowMatch:2087>: Format RGBA_8888.
05-12 17:26:34.497: E/success(10190): created object: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.497: E/JSON Variable(10190): json returns this value: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.537: E/Test JSON(10190): JSON s returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.537: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.537: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.537: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.547: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.547: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.547: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.547: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.547: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.547: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.557: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}
05-12 17:26:34.557: E/Test directory(10190): Directory returns: {"Categories":[{"id":"2","name":"Glass Repair"},{"id":"3","name":"Appliance Repair"},{"id":"4","name":"Air Conditioning"},{"id":"5","name":"Community Involvement"},{"id":"6","name":"Electrical"},{"id":"7","name":"Flooring"},{"id":"8","name":"Heating Repair"},{"id":"9","name":"Landscaping"},{"id":"10","name":"Plumbing"},{"id":"11","name":"Remodeling\/Renovation"},{"id":"12","name":"Window Coverings"}]}

05-12 17:26:33.165:I/Adreno200 EGLSUB（10190）：：格式RGBA_8888。
05-12 17:26:34.497:E/success（10190）：创建对象：{“类别”：[{“id”：“2”，“名称”：“玻璃维修”}，{“id”：“3”，“名称”：“电器维修”}，{“id”：“4”，“名称”：“空调”}，{“id”：“5”，“名称”：“社区参与”}，{“id”：“6”，“名称”：“电气”}，{“id”：“7”，“名称”：“地板”}，{“id”：“8”，“名称”：“供暖维修”}，{“id”：“9”，“名称”：“景观”}，{“名称”：“绿化”}，{“id”：“id”}：“10”，“名称”：“管道”}，{“id”：“11”，“名称”：“改建\/翻新”}，{“id”：“12”，“名称”：“窗帘”}]}
05-12 17:26:34.497:E/JSON变量（10190）：JSON返回此值：{“类别”：[{“id”：“2”，“名称”：“玻璃维修”}，{“id”：“3”，“名称”：“电器维修”}，{“id”：“4”，“名称”：“空调”}，{“id”：“5”，“名称”：“社区参与”}，{“id”：“6”，“名称”：“电气”}，{“id”：“7”，“名称”：“地板”}，{“id”：“8”，“名称”：“供暖维修”}，{“id”：“9”，“名称”：“绿化”}，{“id”：“10”，“名称”：“管道”}，{“id”：“11”，“名称”：“改建\/翻新”}，{“id”：“12”，“名称”：“窗帘”}]}
05-12 17:26:34.537:E/Test JSON（10190）：JSON s返回：{“类别”：[{“id”：“2”，“名称”：“玻璃维修”}，{“id”：“3”，“名称”：“电器维修”}，{“id”：“4”，“名称”：“空调”}，{“id”：“5”，“名称”：“社区参与”}，{“id”：“6”，“名称”：“电气”}，{“id”：“7”，“名称”：“地板”}，{“id”：“8”，“名称”：“供暖维修”}，{“id”：“9”，“名称”：“绿化”}，{id“：”10“，”名称“：”管道“}，{”id“：”11“，”名称“：”改建\/翻新“}，{”id“：”12“，”名称“：”窗帘“}]}
05-12 17:26:34.537
 public void displayCatList(String id, String name){                 

        //....your code here

        //adding HashList to ArrarList
        directoryList.add(map);

         // set Adapter for ListView here

          ListAdapter adapter = new SimpleAdapter(DisplayServiceActivity.this,
                directoryList, 
                R.layout.list_item, 
                new String[] { TAG_ID,TAG_NAME }, 
                new int[] { android.R.id.text1,android.R.id.text2 });

        DisplayServiceActivity.this.setListAdapter(adapter);
    }

protected void onPostExecute(JSONObject s) {          
        super.onPostExecute(s);

        dialog.dismiss();
        Log.e("Test JSON","JSON s returns: " + s);
        try {
            directory = s.getJSONArray("Categories");
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        for(int i = 0; i< directory.length(); i++){
            String str_id = directory.optString(i, "id");
            String str_name = directory.optString(i, "name");
            displayCatList(str_id, str_name);

            Log.e("Test directory","Directory returns: " + json);
        }
        listOfServices = DisplayServiceActivity.this.getListView(); //get builtin listView
        ListAdapter adapter = new SimpleAdapter(DisplayServiceActivity.this,
            directoryList, 
            R.layout.list_item, 
            new String[] { TAG_ID,TAG_NAME }, 
            new int[] { android.R.id.text1,android.R.id.text2 });

        setListAdapter(adapter);
    }