Android : Auto Refresh Image View to get image of same name from website

Hi all i have created an android application in which the device connects to the local network and get the latest image from the website. i have gotten the first image but i cannot make it run constantly because the image is constantly changing in the website all the images have the same name all i need to is restart my asynchronous task again and again. my code is below

import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import java.io.IOException;
import java.io.InputStream;
import java.net.*;
import android.widget.ImageView;
public class S_car extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.scar);
   run();
 }

private class GetXMLTask extends AsyncTask<String, Void, Bitmap> {

    protected Bitmap doInBackground(String... urls) {
        Bitmap map = null;
        for (String url : urls) {
            map = downloadImage(url);
        }
        return map;
    }

    // Sets the Bitmap returned by doInBackground
    protected void onPostExecute(Bitmap result) {
        imageviewA.setImageBitmap(result);
        imageviewA.postInvalidateDelayed(500);
    }

    // Creates Bitmap from InputStream and returns it
    private Bitmap downloadImage(String url) {
        Bitmap bitmap = null;
        InputStream stream = null;
        BitmapFactory.Options bmOptions = new BitmapFactory.Options();
        bmOptions.inSampleSize = 1;

        try {

            stream = getHttpConnection(url);
            bitmap = BitmapFactory.
                    decodeStream(stream, null, bmOptions);
            stream.close();

           // imageviewA.refreshDrawableState();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return bitmap;
    }

    // Makes HttpURLConnection and returns InputStream
    private InputStream getHttpConnection(String urlString)
            throws IOException {
        InputStream stream = null;
        URL url = new URL(urlString);
        URLConnection connection = url.openConnection();

        try {
            HttpURLConnection httpConnection = (HttpURLConnection) connection;
            httpConnection.setRequestMethod("GET");
            httpConnection.connect();

            if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                stream = httpConnection.getInputStream();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return stream;

    }

}    

public void run()
{
    final String URL = "http://192.168.1.106/jpg/image.jpg";
    //for(int i = 0; i<1000;i++);
    //{
    GetXMLTask task = new GetXMLTask();
    // Execute the task
    task.execute(new String[] { URL });
    //imageviewA.refreshDrawableState();
    //imageviewA.postInvalidate();
    //}

}

}