Consuming ABAP Webservice from Android device

Question

Dear Experts,
I am ABAP developer (limited knowledge on android) trying to connect  Android device to a.SAP Webservice
Through trial and error and help from SDN and Android forums i managed to link up the ABAP webservice and android using KSOAP2 API.Its working perfectly now but only when i save the username password for SAP access in the webservice settings in transaction SICF.I need to access the service by passing the username and password values through the SOAP request header but so far my efforts have failed me.im presently using the following code to pass my auth values.
I would be grateful if you can point me in the proper direction.
       String NAMESPACE = "mynamespace (works properly without auth)";
        String METHOD_NAME = "mymethod (works properly without auth)";
        String SOAP_ACTION = "mynamespace/mymethod (works properly without auth)";
        String URL = "myURL{works properly without auth)";
        SoapObject Request = new SoapObject(NAMESPACE, METHOD_NAME);
        Request.addProperty("Purchaseorder","4500001168");
        Request.addProperty("Username", "myusername");
        Request.addProperty("Password", "mypassword");
       SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
       envelope.setOutputSoapObject(Request);
       HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
try
           androidHttpTransport.call(SOAP_ACTION, envelope);
           SoapObject response = (SoapObject)envelope.bodyIn;
           String testValue =  response.getProperty("PoHeader").toString();
           AlertDialog alertDialog = new AlertDialog.Builder(this).create();
           alertDialog.setMessage(testValue);     
           alertDialog.show();
       catch(Exception e)
            e.printStackTrace();
Thanx & Best Regards

Answer 1

Hi,
you can develop a custom Transport class wich extends the: HttpTransportSE class by authentication features.
example:
public class AuthTransportSE extends HttpTransportSE{
     private String username;
     private String password;
     public AuthTransportSE(String url, String username, String password) {
          super(url);
          this.username = username;
          this.password = password;          
     protected ServiceConnection getServiceConnection() throws IOException {
          ServiceConnection midpConnection = new ServiceConnectionSE(url);
          addBasicAuthentication(midpConnection);
          return midpConnection;
     protected void addBasicAuthentication(ServiceConnection midpConnection) throws IOException {
        if (username != null && password != null) {
            StringBuffer buf = new StringBuffer(username);
            buf.append(':').append(password);
            byte[] raw = buf.toString().getBytes();
            buf.setLength(0);
            buf.append("Basic ");
            org.kobjects.base64.Base64.encode(raw, 0, raw.length, buf);
            midpConnection.setRequestProperty("Authorization", buf.toString());
Afterwards you can initialize the Webservice with:
AuthTransportSE androidHttpTransport = new AuthTransportSE(URL, userName, pasword);
Cheers,
Dennis.