java - ProgressDialog not showing up in onPreExecute() -

i saw .get() problem, try without him , nothing. if possible me. progressdialog execute after doinbackground() , after run onpostexecute "dismiss" , progressdialog not show.

    public list<usuario> getlistausuario(activity activity) {         string[] aux = new string[3];         aux[0] = url_ws_usuario;         string[] resposta = null;         aux[2] = "get";          try {             resposta = new webservicecliente(activity).execute(aux).get();         } catch (interruptedexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (executionexception e) {             // todo auto-generated catch block             e.printstacktrace();         }         if (resposta[0].equals("200")) {             gson gson = new gson();             arraylist<usuario> listacliente = new arraylist<usuario>();             jsonparser parser = new jsonparser();             jsonarray array = parser.parse(resposta[1]).getasjsonarray();             (int = 0; < array.size(); i++) {                 listacliente.add(gson.fromjson(array.get(i), usuario.class));             }             return listacliente;          } else {             return null;          }     }   asynctask:  public class webservicecliente extends asynctask<string, void, string[]> {      private activity activity;     private progressdialog pdialog;      public webservicecliente(activity ac) {         activity = ac;     }      public final string[] get(string url) {         string[] result = new string[2];         httpget httpget = new httpget(url);          httpresponse response;          try {             response = httpclientsingleton.gethttpclientinstace().execute(                     httpget);             httpentity entity = response.getentity();              if (entity != null) {                 result[0] = string.valueof(response.getstatusline()                         .getstatuscode());                 inputstream instream = entity.getcontent();                 result[1] = tostring(instream);                 instream.close();                 log.i("get", "result post jsonpost : " + result[0] + " : "                         + result[1]);             }         } catch (exception e) {             log.e("ngvl", "falha ao acessar web service", e);             result[0] = "0";             result[1] = "falha de rede!";         }         return result;     }      public final string[] post(string url, string json) {         string[] result = new string[2];         try {              httppost httppost = new httppost(new uri(url));             httppost.setheader("content-type", "application/json");             stringentity sentity = new stringentity(json, "utf-8");             httppost.setentity(sentity);              httpresponse response;             response = httpclientsingleton.gethttpclientinstace().execute(                     httppost);             httpentity entity = response.getentity();              if (entity != null) {                 result[0] = string.valueof(response.getstatusline()                         .getstatuscode());                 inputstream instream = entity.getcontent();                 result[1] = tostring(instream);                 instream.close();                 log.d("post", "result post jsonpost : " + result[0]                         + " : " + result[1]);             }          } catch (exception e) {             log.e("ngvl", "falha ao acessar web service", e);             result[0] = "0";             result[1] = "falha de rede!";         }         return result;     }      private string tostring(inputstream is) throws ioexception {          byte[] bytes = new byte[1024];         bytearrayoutputstream baos = new bytearrayoutputstream();         int lidos;         while ((lidos = is.read(bytes)) > 0) {             baos.write(bytes, 0, lidos);         }         return new string(baos.tobytearray());     }      @override     protected void onpreexecute() {         super.onpreexecute();          pdialog = new progressdialog(activity);         pdialog.setcanceledontouchoutside(false);         pdialog.setcancelable(false);         pdialog.setindeterminate(true);         pdialog.settitle("conectando servidor.");         pdialog.setmessage("aguarde...");         pdialog.show();      }      @override     protected string[] doinbackground(string... params) {          if (params[2] == "post") {              return post(params[0], params[1]);          } else if (params[2] == "get") {              return get(params[0]);         } else {             return null;         }      }      @override     protected void onpostexecute(string[] params) {          super.onpostexecute(params);          try {             // stop dialog             if (pdialog.isshowing()) {                 pdialog.dismiss();             }          } catch (exception e) {             e.printstacktrace();         }      }  } 

the problem

new webservicecliente(activity).execute(aux).get(); 

get() blocking call, , ui thread blocked waiting get() return there no 1 can take care of drawing progressdialog. remove get(), , use delegate return results on asynctask ui thread, here there example

edit:

your interface should like:

public interface callbackreciever { public void receivedata(string[] result); } 

the constructor of asyntask changes like

callbackreciever mlistener; public webservicecliente(activity ac, callbackreciever listener) {     activity = ac;     mlistener = listener; } 

in onpostexecute:

@override protected void onpostexecute(string[] params) {  try {     if (mlistener != null) {        mlistener.receivedata(params);     }      // stop dialog     if (pdialog.isshowing()) {         pdialog.dismiss();     }  } catch (exception e) {     e.printstacktrace(); } } 

in receivedata, in activity, have process string[] result