Save data to server data base in Android give unexpected error and close -

i make application track geo location , save data server mysql database. when run application show unexpected error , close application. times geolocation not pointing. when comment save code geo location tracking working nicely. cant find exact problem in here code

///////////////// updated locations/////////////  public void onlocationchanged(location location) {      string msg = "updated location: " +             double.tostring(location.getlatitude()) + "," +             double.tostring(location.getlongitude());       toast.maketext(this, msg, toast.length_short).show();     loadsave();      // report ui location updated  }  public void loadsave() {             string mydataurl = "http://myrul.com/savedata.php";         //string type = params[0];     try {          string longi = "aaa"; // double.tostring(location.getlongitude());         string lati = "aare";//double.tostring(location.getlatitude());         string user = "a";         string code = "b";         string date = "c";         url url = new url(mydataurl);         httpurlconnection httpurlconnection = (httpurlconnection) url.openconnection();         httpurlconnection.setrequestmethod("post");         httpurlconnection.setdooutput(true);         httpurlconnection.setdoinput(true);         outputstream outputstream = httpurlconnection.getoutputstream();         bufferedwriter bufferedwriter = new bufferedwriter(new outputstreamwriter(outputstream, "utf-8"));         string post_data = urlencoder.encode("longi", "utf-8") + "=" + urlencoder.encode(longi, "utf-8") + "&" +                 urlencoder.encode("lati", "utf-8") + "=" + urlencoder.encode(lati, "utf-8") + "&" +                 urlencoder.encode("user", "utf-8") + "=" + urlencoder.encode(user, "utf-8") + "&" +                 urlencoder.encode("code", "utf-8") + "=" + urlencoder.encode(code, "utf-8") + "&" +                 urlencoder.encode("date", "utf-8") + "=" + urlencoder.encode(date, "utf-8");         bufferedwriter.write(mydataurl);         bufferedwriter.flush();         bufferedwriter.close();         outputstream.close();                 } catch (malformedinputexception e) {         e.printstacktrace();     } catch (ioexception ex) {         ex.printstacktrace();     }  } 

stack trace

android thought exception because executed network task on main thread. have execute task on other thread put asynctask.

 new asynctask<void, void, void>() {          @override         protected void doinbackground(final void... params) {             loadsave();             return null;         }     }.execute();