XMLPull Parser Exception when calling Magento api using SOAP from Android

I am trying to call magento api using Soap from android but I am getting XMLpullparser Exception.I am using ksoap library.I seached on google but i can't find any solution.Below is my code..

1 import java.io.IOException;

2 import org.ksoap2.SoapEnvelope;
3 import org.ksoap2.serialization.SoapObject;
4 import org.ksoap2.serialization.SoapSerializationEnvelope;
5 import org.ksoap2.transport.AndroidHttpTransport;
6 import org.xmlpull.v1.XmlPullParserException;

7 import android.app.Activity;
8 import android.os.Bundle;
9 import android.util.Log;

10       public class MagentoSoapActivity extends Activity {
11         /** Called when the activity is first created. */

12      private static final String NAMESPACE = "urn:Magento";
13      private static final String Method_Name="login";
14      private static final String URL ="http://www,mymagento,com/api/soap/?wsdl=1";
15      private static final String SOAP_ACTION ="urn:Magento/login";

16 @Override
17 public void onCreate(Bundle savedInstanceState) {
18    super.onCreate(savedInstanceState);
19    setContentView(R.layout.main);
20    try {
21      SoapObject request = new SoapObject(NAMESPACE,Method_Name);

22        request.addProperty("username", "XXX");
23        request.addProperty("apiKey", "YYY");
24        SoapSerializationEnvelope envelopes = new SoapSerializationEnvelope(
25                SoapEnvelope.VER11);

26        envelopes.dotNet = false;
27        envelopes.xsd = SoapSerializationEnvelope.XSD;
28        envelopes.enc = SoapSerializationEnvelope.ENC;


29       envelopes.setOutputSoapObject(request);

30        AndroidHttpTransport androidHttpTransport = new AndroidHttpTransport(URL);
31        androidHttpTransport.debug =true;
32        androidHttpTransport.call(SOAP_ACTION, envelopes);//Getting the Exception here
33        Object result = envelopes.getResponse();

34        Log.d("sessionId", result.toString());

35        //making call to get list of customers

36        String sessionId = result.toString();

37        request = new SoapObject(NAMESPACE,"customerCustomerList");
38        request.addProperty("sessionId",sessionId );

39        envelopes.setOutputSoapObject(request);
40        androidHttpTransport.call(SOAP_ACTION, envelopes);

41        result = envelopes.getResponse();

42        Log.d("Customer List", result.toString());

43    } catch (Exception e) {
44        e.printStackTrace();
45    }
46 }
47 }

Below is stacktrace:

org.xmlpull.v1.XmlPullParserException: expected: START_TAG   
{http://schemas.xmlsoap.org/soap/envelope/}Envelope (position:START_TAG <definitions   
name='Magento' targetNamespace='urn:Magento'>@4:50 in   
java.io.InputStreamReader@44f13f40) 

Please help me I am really depressed by this error. Thanks in advance

I solved my problem.I changed the complete code and instead of using SOAP now I am using XMLRPC.There is XmLRPC library at http://code.google.com/p/android-xmlrpc/ and also the example of how to use this library.

This is the link for how to parse this response in android http://inchoo.net/mobile-development/android-development/parsing-the-xmlrpc-webservice-response-in-android/

Hope this helps someone.

Thanks everyone for your response.