java - AsyncTask/Handler lagging UI -

so have asynctask gets data website, , on it's post execute calls main function settext main's textview.

here code.

@override protected void doinbackground(string... arg0) {          result = connect(start);//connect webpage, start url     // todo auto-generated method stub     return null; }  @override protected void onpostexecute(void result) {     super.onpostexecute(result);      document doc = jsoup.parse(this.result);     elements stuff = doc.select("td");      mainactivity.getdata(doc);//set textview } 

i call handler every 5 seconds, here handler code.

hand = new handler();        r = new runnable() {      @override     public void run() {             dh  = new downloadhelper("http://app2.nea.gov.sg/anti-pollution-radiation-protection/air-pollution/psi/psi-readings-over-the-last-24-hours");             dh.execute("");// todo auto-generated method stub             hand.postdelayed(this, 10000);         }     };  hand.post(r); 

what happens is, when website loading, ui lags lot, point of freezing. have no idea causing this, ui based on viewpager, fragments.

i not running code fragment though, running oncreate of main activity.

edit: edited onpostexecute this

@override protected void onpostexecute(void result) {     // todo auto-generated method stub        super.onpostexecute(result);          elements stuff = doc.select("td");     string[] arr = new string[stuff.size()];     for(int = 0 ; < 3 ; ++)     {          arr[i] = stuff.get(79 + i).text();      }      mainactivity.getdata(arr);     mainactivity.dismissloading(); } 

this getdata

public static void getdata(string[] s) {   edit.settext(s[0]);     } 

this connect()

public static string connect(string l) {      string url = l;     httpurlconnection connect;     string result;     string result2 = null;     bufferedreader br;      try {         connect = (httpurlconnection) (new url(url)).openconnection();         br = new bufferedreader(new inputstreamreader(connect.getinputstream()));         while ((result = br.readline()) != null)         {              result2 += result;         }     } catch (exception e) {         // todo auto-generated catch block              e.printstacktrace();             system.out.print("error");     }     return result2;  } 

for stumbled upon problem , wanted answer, managed fix while working on project.

basically, in

   while ((result = br.readline()) != null)     {          result2 += result;     } 

loop, instead of appending result result2 directly, append result stringbuffer. @ end of loop, add stringbuffer result2.