android - How do I avoid network on main thread exception if I already use AsyncTask? -

it seems me m not calling url,network operations right mainactivity.

• i call url.connect() in class processdata
• i use doinbackground()
• i extend processdata class asynctask

but exception still occurs:

public class mainactivity extends actionbaractivity {      private final string log_tag = mainactivity.class.getsimplename();     @override     protected void oncreate(bundle savedinstancestate) {                     super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          processdata test = new processdata();         test.doinbackground("mysql") ;     }  //separate file processdata.java public class processdata extends asynctask<string, void, string> {  public string createvalidurl(string s){        .....//code in method works fine } public string doinbackground(string ...params){         string validurl = createvalidurl(params[0]);                            httpurlconnection urlconnection = null;         bufferedreader reader = null;         url url = new url(validurl);         urlconnection = (httpurlconnection) url.openconnection();                 urlconnection.setrequestmethod("get");                     urlconnection.connect();                     inputstream inputstream = urlconnection.getinputstream();         stringbuffer buffer = new stringbuffer();          reader = new bufferedreader(new inputstreamreader(inputstream));          string line;             while((line = reader.readline()) != null) {                  buffer.append(line + "\n");             }             urlconnection.disconnect();             reader.close();              return buffer.tostring(); } } 

the network main thread exception still occurs, read other posts. can wrap http connection code new thread, want find wrong

you have call

test.execute(); 

instead of

test.doinbackground("mysql") ;