android - HttpURLConnection not establishing -

hello friends, new web services making simple application establish connection.
below code.

public class mainactivity extends activity {  textview text; string ip = "http://developer.android.com/index.html";  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      text=(textview)findviewbyid(r.id.textview2);      try{                     url url=new url(ip);         executereq(url);          text.settext("connection available");                    }     catch(exception e){         text.settext("connectionn failed");     } }  private void executereq(url url) throws ioexception{      httpurlconnection con=(httpurlconnection)url.openconnection();      con.setreadtimeout(10000);     con.setconnecttimeout(10000);     con.setrequestmethod("get");     con.setdoinput(true);     con.setrequestmethod("head");                     con.connect();                   } 

}

i have declared permission in manifest file can not finding fault.
please me in advance.

this code trigger networkonmainthreadexception. try using asynctask achieve this.

for more info: http://developer.android.com/training/basics/network-ops/connecting.html