Android ขอความช่วยเหลือ เกี่ยวกับ Show Dialog ตอนที่กดเลือก Listview หน่อยครับ

<?
		require_once("lib/nusoap.php");
		 
		//Create a new soap server
		$server = new soap_server();
		 
		//Define our namespace
		$namespace = "http://localhost/nusoap/WebServiceServer.php";
		$server->wsdl->schemaTargetNamespace = $namespace;
		 
		//Configure our WSDL
		$server->configureWSDL("SPUguide");
		 
		// Register our method and argument parameters
        $varname = array(
                   'idAction' => "xsd:string"
        );
		
		$server->register('HelloWorld',$varname, array('return' => 'xsd:string'));
		function HelloWorld($idAction)
		{
			
			$hostname = "localhost"; //ชื่อโฮสต์
			$user = "root"; //ชื่อผู้ใช้
			$password = ""; //รหัสผ่าน
			$dbname = "test"; //ชื่อฐานข้อมูล
			// เริ่มติดต่อฐานข้อมูล
			$dbCon=mysql_connect($hostname, $user, $password) or die("ติดต่อฐานข้อมูลไม่ได้");
			// เลือกฐานข้อมูล
			mysql_select_db($dbname,$dbCon) or die("เลือกฐานข้อมูลไม่ได้");
			mysql_query('SET CHARACTER SET UTF8');
			switch($idAction){
				case 'sub':
					$strSQL = "SELECT * FROM subject";
					$result = mysql_query($strSQL);
					$intNumField = mysql_num_fields($result);
					$resultArray = array();
					while($obResult = mysql_fetch_array($result)){
						$arrCol = array();
						for($i=0;$i<$intNumField;$i++){
							$arrCol[mysql_field_name($result,$i)] = $obResult[$i];
						}
						array_push($resultArray,$arrCol);
					}
					mysql_close($objConnect);
					return json_encode($resultArray);
					break;
			}
		}
		
		// Get our posted data if the service is being consumed
		// otherwise leave this data blank.
		$POST_DATA = isset($GLOBALS['HTTP_RAW_POST_DATA']) ? $GLOBALS['HTTP_RAW_POST_DATA'] : '';
		 
		// pass our posted data (or nothing) to the soap service
		$server->service($POST_DATA);
		exit(); 
?>

package com.andriod.testservice;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import org.xmlpull.v1.XmlPullParserException;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.StrictMode;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {

	private final String NAMESPACE = "http://10.0.2.2/nusoap/WebServiceServer.php";
    private final String URL = "http://10.0.2.2/nusoap/WebServiceServer.php?wsdl"; // WSDL URL
    private final String SOAP_ACTION = "http://10.0.2.2/nusoap/WebServiceServer.php/HelloWorld";
    private final String METHOD_NAME = "HelloWorld"; // Method on web service
    
	@SuppressLint("NewApi")
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		// Permission StrictMode
		if (android.os.Build.VERSION.SDK_INT > 9) {
			StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
					.permitAll().build();
			StrictMode.setThreadPolicy(policy);
		}
		final ArrayList<HashMap<String, String>> MyArrList = new ArrayList<HashMap<String,String>>();
		final ListView lisView1 = (ListView)findViewById(R.id.listView1);
		// btnSend
		Button btnSend = (Button) this.findViewById(R.id.btnSend);
		btnSend.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				EditText txtName = (EditText) findViewById(R.id.txtName);
				
				SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
				request.addProperty("idAction",txtName.getText().toString());
				SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
				envelope.setOutputSoapObject(request);
				HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
				
				try {
					androidHttpTransport.call(SOAP_ACTION, envelope);
					SoapObject result = (SoapObject) envelope.bodyIn;
					
					 
					JSONArray data = new JSONArray(result.toString());
					
					HashMap<String, String> map;
					for(int i = 0; i < data.length(); i++){
						JSONObject c = data.getJSONObject(i);
						map = new HashMap<String, String>();
						map.put("SubjectID", c.getString("ID_Sub"));
						map.put("SubjectName", c.getString("Name_Sub"));
						MyArrList.add(map);
						
					}
					SimpleAdapter sAdap;
					sAdap = new SimpleAdapter(MainActivity.this, MyArrList, R.layout.activity_column,
							new String[] {"SubjectID", "SubjectName"}, new int[] {R.id.ColSubID,
							R.id.ColSubName});
					lisView1.setAdapter(sAdap);
				
				} catch (IOException e) {
					e.printStackTrace();
				}catch (XmlPullParserException e) {
					e.printStackTrace();
				}catch (JSONException e) {
					e.printStackTrace();
				}
			}
		});
		final AlertDialog.Builder viewDetail = new AlertDialog.Builder(this);
		lisView1.setOnItemClickListener(new OnItemClickListener(){
			public void onItemClick(AdapterView<?> myAdapter, View myView,int position, long mylng) {
				String sMemberID = MyArrList.get(position).get("SubjectID").toString();
				String sName = MyArrList.get(position).get("SubjectName").toString();
				viewDetail.setIcon(android.R.drawable.btn_star_big_on);
				viewDetail.setTitle("Subject Detail");
				viewDetail.setMessage("SubjectID : " + sMemberID + "\n"+ "SubjectName : " + sName + "\n");
				viewDetail.setPositiveButton("OK",new DialogInterface.OnClickListener() {
						public void onClick(DialogInterface dialog,int which) {
										dialog.dismiss();
								}
						});
				viewDetail.show();
			};
		});
	}
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tableLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
 
   	<TableRow
      android:id="@+id/tableRow1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content" >
     
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Web Service Example "
        android:layout_span="1"
        android:textAppearance="?android:attr/textAppearanceLarge" />
  	        
 	</TableRow>

	<View
		android:layout_height="1dip"
		android:background="#CCCCCC" />
 
  <TableLayout 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.1"
        android:orientation="horizontal">
		<TableRow>
      </TableRow>
      
      <TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Input Name :"
          android:textAppearance="?android:attr/textAppearanceMedium" />

      <EditText
          android:id="@+id/txtName"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:ems="10" >
      </EditText>

		<Button
		    android:id="@+id/btnSend"
		    android:layout_width="wrap_content"
		    android:layout_height="wrap_content"
		    android:text="Send" />

		<ListView
		    android:id="@+id/listView1"
		    android:layout_width="match_parent"
		    android:layout_height="wrap_content" >
		</ListView>
  	        
 	</TableLayout >

	<View
		android:layout_height="1dip"
		android:background="#CCCCCC" />
   		  
   	
</TableLayout>