使用ksoap2-android订阅sharepoint webservice时身份验证出错

我正在编写一个Android应用程序，它将使用sharepoint 2010中lists.amx服务的getlist（）方法 . 我正在使用ksoap2-android来处理我的soap消息 . 当我尝试进行身份验证时，我得到一个xmlpullparser异常，期望START_TAG ...为什么以下代码不会对sharepoint服务器进行身份验证？

这是我的代码：

public class SharepointList extends Activity {
private static final String SOAP_ACTION = "http://schemas.microsoft.com/sharepoint/soap/GetList";
private static final String METHOD_NAME = "GetList";
private static final String NAMESPACE = "http://schemas.microsoft.com/sharepoint/soap/" ;
private static final String URL = "http://<ip of sharepoint server>/_vti_bin/lists.asmx";

private TextView result;
private Button btnSubmit;

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

    result = (TextView)findViewById(R.id.textView1);
    btnSubmit = (Button)findViewById(R.id.button1);
    btnSubmit.setOnClickListener(new OnClickListener(){
        public void onClick(View v) {
            if(v.getId() == R.id.button1)
            {
                String list = getMobileTestList();
                result.setText(list);
            }

        }

    });


}
private String getMobileTestList()
{
    PropertyInfo pi = new PropertyInfo();
    pi.setName("listName");
    pi.setValue("Mobile Test List");

    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
    request.addProperty(pi);

    String authentication = android.util.Base64.encodeToString("username:password".getBytes(), android.util.Base64.DEFAULT);
    List<HeaderProperty> headers = new ArrayList<HeaderProperty>();
    headers.add(new HeaderProperty("Authorization","Basic " +authentication));
    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
    envelope.dotNet = true;
    envelope.setOutputSoapObject(request);


    HttpTransportSE transport = new HttpTransportSE(URL);
    try
    {
        transport.debug = true;
        transport.call(SOAP_ACTION, envelope, headers);
        //transport.call(SOAP_ACTION, envelope);
        Object result = envelope.getResponse();
        return result.toString();

    }
    catch(Exception e)
    {
        return e.toString();
    }
}
}

这是transport.requestdump（在'<'之前删除）：

• v：信封xmlns：i = "http://www.w3.org/2001/XMLSchema-instance" xmlns：d = "http://www.w3.org/2001/XMLSchema" xmlns：c = "http://schemas.xmlsoap.org/soap/encoding/" xmlns：v = "http://schemas.xmlsoap.org/soap/envelope/">

• v： Headers />

• v：身体>

• GetList xmlns = "http://schemas.microsoft.com/sharepoint/soap/" id = "o0" c：root = "1">

• listName i：type = "d:string">移动测试列表

• / GetList>

• / v：正文>

• / v：信封>

这是transport.responsedump（在'<'之前删除）：

• ！DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

• HTML>

• HEAD>

• TITLE>错误请求

• META HTTP-EQUIV = "Content-Type" Content = "text/html; charset=us-ascii">

• / HEAD>

• BODY>

• h2>错误请求 - 无效的主机名

• hr> p> HTTP错误400.请求主机名无效 .

• / BODY>

• / HTML>