Json Progessbar ข้อมูลไม่แสดงใน listview ( org.json.JSONException: No value for cities )

package com.maptower;

import java.util.ArrayList;
import java.util.HashMap;

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

import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class FragmentA extends Fragment {

	private static String url = "http://192.168.2.150/54_tower/Json_Tower.php";
	
	 //JSON Node Names

	private static final String J_NAME = "t_name";
	private static final String J_NUM = "t_num";
	private static final String J_FLOOR = "t_floor";
	private static final String J_CLASS = "t_room_class";
	private static final String J_TEACHER = "t_room_teacher";
	private static final String J_TOILET = "t_toilet";
	private static final String J_MAP = "t_map";

	private static final String D_NAME = "NAME";
	private static final String D_NUM = "NUM";
	private static final String D_FLOOR = "FLOOR";
	private static final String D_CLASS = "CLASS";
	private static final String D_TEACHER = "TEACHER";
	private static final String D_TOILET = "TOILET";
	private static final String D_MAP = "MAP";

	ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
	
	JSONArray cities = null;
	
	ListView list;

	public static FragmentA newInstance(int page, String title) {
		FragmentA fragmentFirst = new FragmentA();
		Bundle args = new Bundle();
		args.putInt("someInt", page);
		args.putString("someTitle", title);
		fragmentFirst.setArguments(args);
		return fragmentFirst;
	}

	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View rootView = inflater.inflate(R.layout.main_tower, container, false);

		// Permission StrictMode
		if (android.os.Build.VERSION.SDK_INT > 9) {
			StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
					.permitAll().build();
			StrictMode.setThreadPolicy(policy);
		}

		//ListView lisView1 = (ListView) rootView.findViewById(R.id.listView1);

		//new JSONParse().execute();

		/*
		 * lisView1.setOnItemClickListener(new OnItemClickListener() {
		 * 
		 * public void onItemClick(AdapterView<?> parent, View view, int
		 * position, long id) {
		 * 
		 * Intent i = new Intent(getActivity(), Map.class); startActivity(i);
		 * 
		 * } });
		 */

		return rootView;
	}
	
	@Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        oslist = new ArrayList<HashMap<String, String>>();
                
        new JSONParse().execute();  
        
    }

	private class JSONParse extends AsyncTask<String, String, JSONObject> {
		
		private ProgressDialog pDialog;
		JSONParser jParser = new JSONParser();
        private JSONObject json;
		
		protected void onPreExecute() {
			super.onPreExecute();
			
			pDialog = new ProgressDialog(getActivity());
			pDialog.setMessage("Loading Please wait...");
			pDialog.setIndeterminate(false);
			pDialog.setCancelable(false);
			pDialog.show();
		}

		protected JSONObject doInBackground(String... args) {

			json = jParser.getJSONFromUrl(url);

			Log.d("All JSon: ", json.toString());

            return json;
		}

		protected void onPostExecute(JSONObject json) {
			pDialog.dismiss();

			try {
				cities  = json.getJSONArray("cities");

				Log.d("TAG JSON", "" + cities.toString());

				for (int i = 0; i < cities.length(); i++) {
					JSONObject c = cities.getJSONObject(i);

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

					map.put(D_NAME, c.getString(J_NAME));
					map.put(D_NUM, c.getString(J_NUM));
					map.put(D_FLOOR, c.getString(J_FLOOR));
					map.put(D_CLASS, c.getString(J_CLASS));
					map.put(D_TEACHER, c.getString(J_TEACHER));
					map.put(D_TOILET, c.getString(J_TOILET));
					map.put(D_MAP, c.getString(J_MAP));

					oslist.add(map);
					
					  list = (ListView)getView().findViewById(R.id.listView1);

	                     ListAdapter adapter = new SimpleAdapter(getActivity(), oslist,
	                         R.layout.tower_column,
	                         new String[] {D_NAME,D_NUM,D_FLOOR,D_CLASS,D_TEACHER,D_TOILET,D_MAP},new int[] { R.id.Name,R.id.Num,R.id.Floor,R.id.Room_Class,R.id.Room_Teacher,R.id.Toilet});
	                     list.setAdapter(adapter);
//	                     list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
//	                         @Override
//	                         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//	                             Toast.makeText(getActivity(), "You Clicked at "+oslist.get(+position).get("name"), Toast.LENGTH_SHORT).show();
//	                         }
//	                     });

				}
			} catch (JSONException e) {
				e.printStackTrace();
			}
		}
	}
}