How to implement ASyncTask in Android -

can tell me how update ui using asynctask , give example?

i getting value 2 webservices. 2 webservices getting value in 2 arraylist on post method not return value rounding in loop. how return onpostexecutemethod?

this async class:

public class hometask extends asynctask<void,void,bundle>  {           private context ctx;          public hometask(context context) {              ctx = context;          }           @override          protected void onpreexecute() {              //super.onpreexecute();          //setcontentview(r.layout.splash);             dlg = new progressdialog(getdialogcontext());              dlg.setmessage("loading....");              dlg.show();             //setcontentview(r.layout.splash);         }            @override         protected bundle doinbackground(void... params) {                bundle b=new bundle();              // todo auto-generated method stub             try             {                      webservice tableservice=new webservice();                 tableservicevalue=tableservice.calltableserver(soap_action,"",strusername,strpassword,questgroupid,url);                   tableservicevalue=decodexmldata(tableservicevalue);                    domtableparser parser=new domtableparser();                  parser.settableservicevalue(tableservicevalue);                  parsedvalue=parser.parsexmlfile(tableservicevalue);                  log.d("1234%%%%$$$$$$$parsed value$$$$$", parsedvalue.tostring());                   webservice service=new webservice();                   webservicevalue=service.callhomeserver(soap_action,"",strusername,strpassword,questgroupid,url);                    webservicevalue=decodexmldata(webservicevalue);                     articleparser articleparser=new articleparser();                articleparsedvalue=articleparser.parsexmlarticle(webservicevalue);                  //b.putstringarraylist("articleparsedvalue", articleparsedvalue);                  log.d("(((((((parsed value is",parsedvalue.tostring());                 b.putstringarraylist("parsedvalue", parsedvalue);                b.putstringarraylist("articleparsedvalue", articleparsedvalue);                log.d("(((((((parsed value is",articleparsedvalue.tostring());                 }             catch (exception e) {             // todo: handle exception                 e.printstacktrace();         }         return b;         }                              @override              protected void onpostexecute(bundle b) {                  log.d("vijay checking","checking&&&&");                               log.d("****","*********");                               log.d("calling","handler");                               log.d("****","*********");                    parsedvalue1=b.getstringarraylist("parsedvalue");                  articleparsedvalue1=b.getstringarraylist("articleparsedvalue");                    }  

onupdating user interface

new hometask(homeactivity2.this).execute(null);   for(int i=0;i<parsedvalue1.size();i++) {                 domparsertabledataset dataset=(domparsertabledataset)parsedvalue1.get(i);                    if(i==0)                 {                     log.d("&&&&&&index name is", dataset.getindexname());                     log.d("&&&&&&index name is", dataset.getlastvalue());                     log.d("&&&&&&index name is",dataset.getchangepercentage() );                  txtindex0.settext(dataset.getindexname());                  txtlast0.settext(dataset.getlastvalue());                  txtchange0.settext(dataset.getchangepercentage());                 }                 if(i==1)                 {                     log.d("&&&&&&index name is", dataset.getindexname());                     log.d("&&&&&&index name is", dataset.getlastvalue());                     log.d("&&&&&&index name is",dataset.getchangepercentage() );                     txtindex1.settext(dataset.getindexname());                      txtlast1.settext(dataset.getlastvalue());                     txtchange1.settext(dataset.getchangepercentage());                    }                if(i==2)                 {                 log.d("&&&&&&index name is", dataset.getindexname());                 log.d("&&&&&&index name is", dataset.getlastvalue());                 log.d("&&&&&&index name is",dataset.getchangepercentage() );                  txtindex2.settext(dataset.getindexname());                  txtlast2.settext(dataset.getlastvalue());                  txtchange2.settext(dataset.getchangepercentage());                  }              if(i==3)             {                 log.d("&&&&&&index name is", dataset.getindexname());                 log.d("&&&&&&index name is", dataset.getlastvalue());                 log.d("&&&&&&index name is",dataset.getchangepercentage() );              txtindex3.settext(dataset.getindexname());                  txtlast3.settext(dataset.getlastvalue());                  txtchange3.settext(dataset.getchangepercentage());              }            }           //       for(int i=0;i<articleparsedvalue1.size();i++)        {             system.out.println("for loop checking is"+i);                 articledataset articledataset=(articledataset)articleparsedvalue1.get(i);             system.out.println("articledataset.getarticle_title()"+articledataset.getarticle_title());                         hashmap<string, string> mapvalue=new hashmap<string, string>();                      webview webviewcontent=new webview(homeactivity2.this);              if(articledataset.getarticle_summary().length()>75)                {                   summary=articledataset.getarticle_summary().substring(0,75)+"...";              }              else              {                  summary=articledataset.getarticle_summary();              }                  string html ="<html><body><div><label> <font face=\"verdana\"  color=\"#c1002b\" size=\"4\"><b>"+articledataset.getarticle_title()+"</b> </font> </label>"+ "<label> <font color=\"#000000\" size=\"2\" face=\"verdana\">"+"|"+"</font></label> "+"<label> <font color=\"#aaaaaa\" face=\"verdana\" size=\"2\">"+articledataset.getarticle_date()+" </font></label></div>";           html=html+"<div><label> <font color=\"#000000\" face=\"verdana\" size=\"2\">"+summary+" </font></label></div></body></html>" ;              webviewcontent.getsettings().setjavascriptenabled(true);           webviewcontent.clearcache(true);           final activity activity = homeactivity2.this;             webviewcontent.loaddata(html, "text/html", "utf-8");             if(i==articleparsedvalue1.size()-1)                       {           webviewcontent.setwebviewclient(new webviewclient()            {               public boolean shouldoverrideurlloading(webview view, string url)                {                                 view.loadurl(url);                   return true;                         }                public void onpagefinished(webview view, string url)               {                   // setcontentview(r.layout.home);                     if (dlg.isshowing())                   {                     dlg.dismiss();                    dlg = null;                     }                 splash.setvisibility(view.gone);                 // setcontentview(repl);                 }                             });            }            mainlinear4.addview(webviewcontent);              //webviewcontent.setontouchlistener(homeactivity2.this);                          }  } 

list<string> data; // declare here can use in onpostexecute(). public class youractivity extends activity { public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);     starttask(); } private void starttask() {         new fileasync().execute("start");         toast toast = toast.maketext(youractivity.this," start:" , 7);toast.show();      }  class fileasync extends asynctask<string, string, string> {          @override         protected void onpreexecute() {             super.onpreexecute();             m_progressdialog = progressdialog.show(youractivity.this,                       "", "loading ...", true);         }          @override         protected string doinbackground(string... aurl) {                // these methods calling data web service made                 // in sperate class can here well.          tempdao tempdao = new tempdaoimpl();                                 data    = tempdao.getdatalist(arg1,arg2);               return null;          }         protected void onprogressupdate(string... progress) {              log.d("andro_async",progress[0]);          }          @override         protected void onpostexecute(string unused) {             textview textdata= new textview(youractivity.this);         textdata.settext(data.get(1));         textdata.settextcolor(color.white);         textdata.setgravity(gravity.center);         setcontentview(textdata);         m_progressdialog.dismiss();         }     }