How to refresh ListActivity after downloading data
<p>I have created a ListActivity in which I am showing some data ,but after pressing download button app downloads latest data , It will be shown in ListActivity so please help me that how can i refresh ListActivity.</p>

<pre><code>      public void fetch1(){

                event=this;

                // TODO Auto-generated method stub
                try {

                    Runnable runnable = new Runnable() {
                        @Override
                        public void run() {
                                handler.post(new Runnable() {
                                    @Override
                                    public void run() {
                                        try{

          //dialog.show();


          BufferedReader in = null;





          String url=URLManager.orderUrl+DataFactory.userData.sid+"&amp;dnumber="+DataFactory.userData.dnumber+"&amp;from_date="+fromDateStr+"&amp;to_date="+toDateStr; ;

         // String login = "morris";
          //String pass = "mor$ris";

          DefaultHttpClient client = new DefaultHttpClient();
          HttpGet request = new HttpGet();


          client.getCredentialsProvider().setCredentials(new AuthScope("newdev.objectified.com", 80), new UsernamePasswordCredentials(URLManager.user, URLManager.pass));

          request.setURI(new URI(url));
          HttpResponse response = client.execute(request);

                 in = new BufferedReader
                 (new InputStreamReader(response.getEntity().getContent()));
                 StringBuffer sb = new StringBuffer("");
                 String line = "";
                 String NL = System.getProperty("line.separator");
                 while ((line = in.readLine()) != null) {
                     sb.append(line + NL);
                 }
                 in.close();
                 String page = sb.toString();
              //  Toast.makeText(event,url+"--::::--"+ page, Toast.LENGTH_LONG).show();


                  OrdersHandler handler=new OrdersHandler();
                SAXParserFactory spf = SAXParserFactory.newInstance();
                SAXParser sp = spf.newSAXParser();
                XMLReader xr = sp.getXMLReader();
                xr.setContentHandler(handler);
                InputSource is = new InputSource();
                  is.setCharacterStream(new StringReader(page));           
                  xr.parse(is);  
                  Vector v=handler.getData();
                  DataFactory.ordersVector=v;


                 dataVector=DataFactory.ordersVector;

                 ordersId=new String[dataVector.size()];
                for(int a=0;a&lt;dataVector.size();a++){
                    OrdersData o=(OrdersData)dataVector.elementAt(a);
                    ordersId[a]=o.order_id;



                }// end of the for


                //event.setListAdapter(new IconicAdapter());

            //  adapter.clear();
                // Create an ArrayAdapter, that will actually make the Strings above
                // appear in the ListView






                  /*
                 for(int a=0;a&lt;v.size();a++){
                    OrdersData o=(OrdersData)v.elementAt(a);
                    names=names+o.order_id+"\n";


                 }// end of the for loop

                //String data=d.sid+"\n"+d.dtitle+"\n"+d.dcountry+"\n"+d.dcity;
                  Toast.makeText(event, names, Toast.LENGTH_LONG).show();
                   */


                                        }catch(Exception e){


                                        }
                                        }
                                });
                            }

                    };
                    new Thread(runnable).start();



                    //executeHttpGet();

                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                     Toast.makeText(this, e+"", Toast.LENGTH_SHORT).show();
                }
                adapter.setNotifyOnChange(true);
                //adapter.clear();
                adapter=new IconicAdapter();
                this.setListAdapter(adapter);

            }// end of the fetch method
</code></pre>

<p>I am downloading data then want to refresh the ListActivity.But application  is going to be crashed when I press the download button</p>
