Consumir un webservice usando otro thread y la biblioteca ksoap2-android... Una modificación basado en el trabajo de LastDragon (www.lastdragon.net)

cliente.java

    package me.rodmoreno.webservice;
     
    import android.os.AsyncTask;
    import android.os.Bundle;
    import android.app.Activity;
    import android.view.Menu;
    import android.view.View;
    import android.widget.EditText;
    import android.widget.TextView;
     
    import org.ksoap2.SoapEnvelope;
    import org.ksoap2.serialization.SoapObject;
    import org.ksoap2.serialization.SoapSerializationEnvelope;
    import org.ksoap2.transport.HttpTransportSE;
     
    public class MainActivity extends Activity {
     
        private EditText textoEntrada;
        private TextView textoSalida;
     
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
     
            textoEntrada = (EditText) findViewById(R.id.entrada);
            textoSalida = (TextView) findViewById(R.id.salida);
        }
     
     
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }
     
        public void clickBoton(View v)
        {
            new consumirWS().execute(textoEntrada.getText().toString());
        }
     
        private class consumirWS extends AsyncTask<String, Void, String>{
            final String SOAP_ACTION = "urn:webserv";
            final String METHOD = "saludo";
            final String NAMESPACE = "urn:webserv";
            final String ENDPOINTWS = "http://www.lastdragon.net/misarchivos/webserv/serv.php";
            String respuesta = null;
     
     
            protected String doInBackground(String... args)
            {
                SoapObject userRequest = new SoapObject(NAMESPACE, METHOD);
                userRequest.addProperty("nombre", args[0]);
     
                SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
                envelope.setOutputSoapObject(userRequest);
     
                try{
                    HttpTransportSE androidHttpTransport = new HttpTransportSE(ENDPOINTWS);
                    androidHttpTransport.debug = true;
                    androidHttpTransport.call(SOAP_ACTION, envelope);
     
                    respuesta = envelope.getResponse().toString();
                }
                catch (Exception e){
                    e.printStackTrace();
                }
     
                return respuesta;
            }
     
            protected void onPostExecute(String result)
            {
                textoSalida.setText(result);
     
                super.onPostExecute(String.valueOf(result));
            }
        }
       
    }

servicio.php

<?php
	require_once dirname(__FILE__) . "/lib/nusoap.php";

	function saludar($nombre)
	{
		return "Hola " . $nombre;
	}

	$servicio = new soap_server();
	$servicio->configureWSDL("webserv", "urn:webserv");
	$servicio->register("saludar", array("nombre" => "xsd:string"), array("return", => "xsd:string"));
	$servicio->service($HTTP_RAW_POST_DATA);