一个简单的JSON请求，求帮助。该如何处理

package com.jiepang;

import java.io.UnsupportedEncodingException;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class JiepangActivity extends Activity {
    /** Called when the activity is first created. */
    
    TextView nr = null;
    Button qr = null;
    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    
        nr = (TextView)findViewById(R.id.nr);
        qr = (Button)findViewById(R.id.queding);
        qr.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                  
                AlertDialog.Builder dlg = new Builder(JiepangActivity.this);
                
                
                
                
                    try {
                       /***************************发送信息*********************************/
                       HttpPost request = new HttpPost("http://api.jiepang.com/v1/locations/show"); 
                       JSONObject param = new JSONObject(); 
                        param.put("guid", "成都豪生国际大酒店");
                        param.put("source", "100303");
                        StringEntity se;
                        se = new StringEntity(param.toString());
                        request.setEntity(se); 
             /***************************接收信息*********************************/
                        dlg.setTitle("1111").create().show();
                        HttpResponse httpResponse = new DefaultHttpClient().execute(request); 
                        String retSrc = EntityUtils.toString(httpResponse.getEntity()); 
                        JSONObject result = new JSONObject( retSrc);  
                        String name = (String) result.get("name");
                        String city = (String) result.get("city");
                        String addr = (String) result.get("name");
                        String checkin_users_num = (String) result.get("checkin_users_num");
                    
                        
                        nr.setText("地点名称 :"+name+"\n"+"地点所在城市:"+city+"\n"+"地点地址:"+addr+"\n"+"地点总签到人数:"+checkin_users_num);
                    
                   } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } 
                
            }
        });

       
        
        
 
    }
         
}