namespace WebService3
    {
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // [System.Web.Script.Services.ScriptService]


    class DBConnect
    {
        private MySqlConnection connection;
        private string server;
        private string database;
        private string uid;
        private string password;
    }

    private void Initialize()
    {
            server = "localhost";
            database = "eagles_db";
            uid = "root";
            password = "";
            string connectionString;
            connectionString = "SERVER=" + server + ";" + "DATABASE=" +
            database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";";

            connection = new MySqlConnection(connectionString);
    }

public XmlDocument abmeldungen()
        {
            XmlDocument doc = new XmlDocument();
            XmlNode root;
            XmlNode tempHeader;
            XmlNode tempInhalt;

            List<int> lstIDs = new List<int>();
            List<string> lstNamen = new List<string>();
            string ausgabe = string.Empty;



            string conStr = ConfigurationManager.ConnectionStrings["dbstring"].ConnectionString;

            string befehl = "Select abmeldung.cf_created, abmeldung.datum, abmeldung.grund, web_users.name From abmeldung Inner Join web_users On abmeldung.cf_user_id = web_users.id Order By abmeldung.cf_created Desc";



            MySql.Data.MySqlClient.MySqlCommand cmd = new MySqlCommand(befehl, connection);



            connection.Open();

            MySql.Data.MySqlClient.MySqlDataReader reader = cmd.ExecuteReader();



            root = doc.CreateElement("Abmeldungen");
            doc.AppendChild(root);


            tempHeader = doc.CreateElement("Abmeldungen"); //doc.CreateElement(reader["reportTitle"].ToString());

            root.AppendChild(tempHeader);

            while (reader.Read())
            {
                tempInhalt = doc.CreateElement("Name");
                tempHeader.AppendChild(tempInhalt).InnerText = reader["name"].ToString();

                tempInhalt = doc.CreateElement("Grund");
                tempHeader.AppendChild(tempInhalt).InnerText = reader["grund"].ToString();

                tempInhalt = doc.CreateElement("datum");
                tempHeader.AppendChild(tempInhalt).InnerText = reader["datum"].ToString();

                tempInhalt = doc.CreateElement("erstellt");
                tempHeader.AppendChild(tempInhalt).InnerText = reader["cf_created"].ToString();
            }

            reader.Close();

            connection.Close();

            return doc;

        }

        [WebMethod]
        public XmlDocument abmeldung()
        {
            DBConnect con1 = new DBConnect();
            return con1.abmeldungen();
        }

package de.maturaprojekt.sema;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.PropertyInfo;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;


import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;


public class Abmeldungen extends Activity {

    public static String NAMESPACE = "http://tempuri.org/";
    public static String SOAP_ACTION = "http://10.0.2.2:28266/Service1.asmx/abmeldung";
    public static String METHOD_NAME = "abmeldung";

    public static String URL = "http://10.0.2.2:28266/Service1.asmx";

    public static String response;

    public static String abmeldungen1()
    {
        //SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

        return "Error";
    }

    public static String abmeldungen()
    {


        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);


        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);

        envelope.setOutputSoapObject(request);

        try
        {
            HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);

            androidHttpTransport.call(SOAP_ACTION, envelope);

            // SoapResult
            SoapObject result = (SoapObject)envelope.getResponse(); //body.In


            if (result != null)
            {
                response=result.toString(); //getProperty(0)

                if(response.equals("false"))
                {
                    return "Error";
                    //error,
                }

                else
                {
                    return "IT WORKS";
                    // everything works correctly
                }

            }

            else
            {
                return "ERROR2";
                // no answer from webservice
            }
        }

        catch (Exception exc)
        {
            Log.i("tom",exc.toString());
            return "ERROR3";
            // andere Probleme
        }



    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_abmeldungen);
    }

    public void btn_abfragen(View view)
    {
        //Toast.makeText(this, "abgerufen", Toast.LENGTH_SHORT).show();
        String return22 = abmeldungen();

        Toast.makeText(this,return22, Toast.LENGTH_LONG).show();

    }



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.abmeldungen, menu);
        return true;
    }
}

public static String SOAP_ACTION = "http://10.0.2.2:28266/Service1.asmx/abmeldung";

"http://tempuri.org/Service1/abmeldung"

http://10.0.2.2:28266/Service1.asmx

<wsdl:binding name="BasicHttpBinding_Service1" type="tns:example">
<soap:binding transport="http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name="ambeldung">
<soap:operation soapAction="http://tempuri.org/examplesoapaction/example" style="document"/>
......
......