android device is not worked
===

i have develope one calculation example using soap webservices.it is scuuessfully worked on my emulator.but it is not worked on my android real device.why dis is not worked on my device.

dis is my code:

    package org.web.frontend.calculator;
    import java.io.IOException;
    import java.net.SocketException;

    import org.ksoap2.SoapEnvelope;
    import org.ksoap2.serialization.SoapObject;
    import org.ksoap2.serialization.SoapSerializationEnvelope;
    import org.ksoap2.transport.HttpTransportSE;
    import org.ksoap2.transport.ServiceConnection;
    import org.xmlpull.v1.XmlPullParserException;

    import android.app.Activity;
    import android.os.Bundle;
    import android.widget.TextView;
    import android.util.Log;
    public class AndroidWSDLFrontEnd extends Activity {

    private String METHOD_NAME ="sum";
    private String NAMESPACE = "http://calculator.backend.web.org";
    private String SOAP_ACTION = NAMESPACE + METHOD_NAME; // NAMESPACE + method name
    private static final String URL = "http://192.168.1.168:8085/Calculation/services /Calculate?wsdl"; // you must use ipaddress here, don’t use Hostname or localhost

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    TextView tv = (TextView) findViewById(R.id.txtAddition);


    try
    {
    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
    request.addProperty("i", 15);
    request.addProperty("j", 10);

    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
    envelope.dotNet = true;
    envelope.setOutputSoapObject(request);
    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
    androidHttpTransport.call(SOAP_ACTION,envelope);
    Object result = envelope.getResponse();
    System.out.println("Result : " + result.toString());
    ((TextView) findViewById (R.id.txtAddition)).setText("Addition : "+result.toString());
    } catch (SocketException E) {
     E.printStackTrace();
    ((TextView) findViewById (R.id.txtAddition)).setText("ERROR: "   +    E.getClass().getName() + ":" + E.getMessage());
      }
     catch (IOException e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
        } catch (XmlPullParserException e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
      }
       }
        }
please help me.