Question

I’ve a class implementing AsyncTask.

It computes an object (User) and I want to return that object to main (UI) thread to be passed to a new activity.

I know it is done with Activity.runOnUiThread() but I can’t understand what to pass to this function etc? (I want to set a variable User usr = value , in main thread)

How should I do?

Thank you

EDIT:
using “Vipul Shah” code I get “unexcepted close”.
This is the log (from logcat):

06-12 10:28:05.404: E/AndroidRuntime(1475): FATAL EXCEPTION: AsyncTask #1
06-12 10:28:05.404: E/AndroidRuntime(1475): java.lang.RuntimeException: An error occured while executing doInBackground()
06-12 10:28:05.404: E/AndroidRuntime(1475):     at android.os.AsyncTask$3.done(AsyncTask.java:278)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at java.lang.Thread.run(Thread.java:856)
06-12 10:28:05.404: E/AndroidRuntime(1475): Caused by: java.lang.NullPointerException
06-12 10:28:05.404: E/AndroidRuntime(1475):     at org.ksoap2.serialization.SoapSerializationEnvelope.getResponse(SoapSerializationEnvelope.java:513)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at es.es.ValidacionThread.doInBackground(ValidacionThread.java:65)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at es.es.ValidacionThread.doInBackground(ValidacionThread.java:1)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at android.os.AsyncTask$2.call(AsyncTask.java:264)
06-12 10:28:05.404: E/AndroidRuntime(1475):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
06-12 10:28:05.404: E/AndroidRuntime(1475):     ... 4 more

ValidacionTask full source code:

package es.es;

import java.io.IOException;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.SoapFault;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import org.xmlpull.v1.XmlPullParserException;

import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Handler;



public class ValidacionThread extends AsyncTask<String, Object, Usuario> {

    private final String NAMESPACE = "http://webservices.pcp/";
    private final String URL = "http://127.0.0.1:8080/webServices/pcpWS?wsdl";
    private final String SOAPACTION = "";
    private final String METHOD = "ValidarUsuario";
    private AccesoCuentaActivity act;

    //Handler handler;

    private Context context;

    public ValidacionThread(Context context){
        this.context = context;
    }

    protected Usuario doInBackground(String[] pars) {

                 String user = pars[0];
                 String password = pars[1];
                SoapObject request = new SoapObject(NAMESPACE, METHOD); 
                SoapSerializationEnvelope sobre = new SoapSerializationEnvelope(SoapEnvelope.VER11);
                sobre.dotNet = false;       
                request.addProperty("login", user);        
                request.addProperty("password", password); 
                sobre.setOutputSoapObject(request); 

                HttpTransportSE transporte = new HttpTransportSE(URL);        
                try {
                    transporte.call(SOAPACTION, sobre);
                } catch (IOException e) {
                //  JOptionPane.e.printStackTrace();
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (XmlPullParserException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                SoapObject resultado = null;
                try {
                    resultado = (SoapObject)sobre.getResponse();
                } catch (SoapFault e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                Usuario usu = new Usuario();
                usu.IdUsuario= resultado.getProperty(0).toString();
                usu.Nombre = resultado.getProperty(1).toString();
                usu.Apellidos = resultado.getProperty(2).toString();
                usu.Rol = resultado.getProperty(3).toString();   
                usu.Centro=resultado.getProperty(4).toString();
                return usu;     

}
       protected void onPostExecute(Usuario usu) {
          Intent intent = new Intent(context, MainActivity.class);
           intent.putExtra("result", usu);
           context.startActivity(intent);
           super.onPostExecute(usu);

        }

       protected void onProgress(Usuario usu) {

        }

}

Answer 1

It computes an object (User) and I want to return that object to main
(UI) threa to be passed to a new activity.

Computation of object should happen in doInBackground method and once done use onPostExceute method to do UI Part.

Below snippet will help you.

Sample Activity Class.

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

        new MyTask(this).execute("");
    }


}

MyTask.java

class MyTask extends AsyncTask<String, Object, String> {

        private Context context;

        public MyTask(Context context) {
            this.context = context;
        }

        @Override
        protected String doInBackground(String... params) {
            // Do background operations here and once done return the result.

            return result;
        }

        @Override
        protected void onPostExecute(String result) {

            // Here you will receive that result.

            Intent intent = new Intent(context, SecondActivity.class);
            intent.putExtra("result", result);
            context.startActivity(intent);
            super.onPostExecute(result);
        }

    }