How to call a WCF service using ksoap2 on android?

finally I got it to work
because the namespace missed a “https://stackoverflow.com/” in the end ,

following is my code

package cn.qing.ksop2test;


import java.io.Writer;

import org.ksoap2.*;
import org.ksoap2.serialization.*;
import org.ksoap2.transport.*;
import org.xmlpull.v1.XmlSerializer;

import android.app.Activity;
import android.os.Bundle;
import android.util.Xml;
import android.widget.TextView;

public class ksop2test extends Activity {
/** Called when the activity is first created. */


private static final String METHOD_NAME = "HelloWorldRequest";
//  private static final String METHOD_NAME = "HelloWorld";

private static final String NAMESPACE = "http://tempuri.org/";
//  private static final String NAMESPACE = "http://tempuri.org";

private static final String URL = "http://192.168.0.2:8080/HelloWCF/Service1.svc";
//  private static final String URL = "http://192.168.0.2:8080/webservice1  /Service1.asmx";

final String SOAP_ACTION = "http://tempuri.org/IService1/HelloWorld";
//  final String SOAP_ACTION = "http://tempuri.org/HelloWorld";
TextView tv;
StringBuilder sb;
private XmlSerializer writer;



@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    tv = new TextView(this);
    sb = new StringBuilder();
    call();
    tv.setText(sb.toString());
    setContentView(tv);
}

public void call() {
    try {

        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

        request.addProperty("Name", "Qing");

        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
                SoapEnvelope.VER11);
        envelope.dotNet = true;
        envelope.setOutputSoapObject(request);


        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
        androidHttpTransport.call(SOAP_ACTION, envelope);
        SoapPrimitive result = (SoapPrimitive)envelope.getResponse();

        //to get the data
        String resultData = result.toString();
        // 0 is the first object of data 


        sb.append(resultData + "\n");
        } catch (Exception e) {
        sb.append("Error:\n" + e.getMessage() + "\n");
        }

    }

}