android - AsyncTask implementation issues -

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can me implementing asynktask code?

i´m new android , don´t know how structure code

public class displayactivity extends listactivity {  private final string tag="links";  private arrayadapter<string> madapter = null; arraylist<string> listitems=new arraylist<string>(); arrayadapter<string> adapter;  string sites[]={"http://www.dn.pt/inicio",         "http://www.expresso.sapo.pt","http://www.publico.pt/?fullsite=true"};    @suppresslint( "newapi") @override protected void oncreate(bundle savedinstancestate){     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_display);      // make sure we're running on honeycomb or higher use actionbar apis     //if (build.version.sdk_int >= build.version_codes.honeycomb) {     // show button in action bar.     //  getactionbar().setdisplayhomeasupenabled(true);     //}      final intent intent = getintent();     final string url_link =intent.getstringextra(mainactivity.extra_inputurl);     final string keyword = intent.getstringextra(mainactivity.extra_inputkey);       madapter=new arrayadapter<string>(this,android.r.layout.simple_list_item_1, android.r.id.text1);     final listview list=(listview) findviewbyid(android.r.id.list);     list.setadapter(madapter);      //get juice     keyword.tolowercase();       for(int i=0; < sites.length;i++){         elements elem= gethtmlcode(sites[i]);         for(element link:elem){             if(/*link.absurl(sites[i]).contains(link.attr("abs:href")) &&*/ link.text().tolowercase().contains(keyword)){                     madapter.add(link.text() + ": " + link.attr("abs:href"));                      madapter.notifydatasetchanged();             }         }     } }   private elements gethtmlcode(string url) {     try {         if (!url.startswith("http://") && !url.startswith("https://"))             url = "http://" + url;          document doc = jsoup.connect(url).get();         elements content=doc.select("a[href]");         return content;     }      catch (ioexception e) {          // never e.printstacktrace(), cuts off after lines , you'll         // lose information that's useful debugging. use proper         // logging, android's log class, check out         // http://developer.android.com/tools/debugging/debugging-log.html         log.e(tag, "failed load html code", e);         // tell user went wrong (keep simple,         // no stacktraces):          toast.maketext(this, "failed load html code",                 toast.length_short).show();      }     return null; }  @override public boolean onoptionsitemselected(menuitem item) {     switch (item.getitemid()) {     case android.r.id.home:         // id represents home or button. in case of         // activity, button shown. use navutils allow users         // navigate 1 level in application structure.         // more details, see navigation pattern on android design:         //         // http://developer.android.com/design/patterns/navigation.html#up-vs-back         //         navutils.navigateupfromsametask(this);         return true;     }     return super.onoptionsitemselected(item); } 

there bunch of documentation on topic. can try this

   private class downloadfilestask extends asynctask<url, integer, long> {         protected void onpreexecute (){             dialog = progressdialog.show(youractivity.this ,"title","message");         }           protected void doinbackground(url... urls) {             //add function want call in async task here             for(int i=0; < urls.length;i++){                 elements elem= gethtmlcode(urls[i]);                 for(element link:elem){                     if(/*link.absurl(sites[i]).contains(link.attr("abs:href")) &&*/ link.text().tolowercase().contains(keyword)){                             madapter.add(link.text() + ": " + link.attr("abs:href"));                              madapter.notifydatasetchanged();                     }                 }             }          }            protected void onpostexecute(long result) {             dialog.dismiss();          }      } 

then can call ever need with:

new downloadfilestask().execute(url1, url2, url3);