android - ProgressDialog getting Dismissed before Toast appears from doInBackground method of AsyncTask -

i'm making json http request using asynctask. have created progressdialog in onpreexecute() , i'm dismissing in onpostexecute(). problem is, there toast message in diinbackground()which shows json response , progressdialog being dismissed before toast appears, meaning onpostexecute() being called before toast generated. how can dismiss before toast appears?

here code.

private  class login extends asynctask<void,void,void>{       private progressdialog progressdialog;        @override       protected void onpreexecute(){           super.onpreexecute();           // create & start progress dialog           progressdialog = new progressdialog(loginactivity.this);           progressdialog.setmessage("loading...");           progressdialog.show();       }       @override       protected void doinbackground(void... params) {           string url = "http://api.openweathermap.org/data/2.5/weather?q=london,uk";           jsonobjectrequest req = new jsonobjectrequest(url, null,                   new response.listener<jsonobject>() {                        @override                       public void onresponse(jsonobject response) {                            try {                                    toast.maketext(getapplicationcontext(),response.tostring() , toast.length_short).show();                                }                            }                           catch (exception e){                               toast.maketext(getapplicationcontext(),"server error!..",toast.length_short).show();                            }                         }                   }, new response.errorlistener() {               @override               public void onerrorresponse(volleyerror error) {                   volleylog.e("from on error response server error..: ", error.getmessage());                }           });            appcontroller.getinstance().addtorequestqueue(req);              return null;       }       @override       protected void onpostexecute(void v){           // terminate progress dialog           progressdialog.dismiss();       }       } 

no need write volley request in async task. can directly excute task because internaly it's using thread. once got response or failure u can close dialog there self. guess helps

 string url = "http://api.openweathermap.org/data/2.5/weather?q=london,uk";       jsonobjectrequest req = new jsonobjectrequest(url, null,               new response.listener<jsonobject>() {                    @override                   public void onresponse(jsonobject response) {        if(progressdialog.isshowing){      progressdialog.cancel();        }                       try {                                toast.maketext(getapplicationcontext(),response.tostring() , toast.length_short).show();                            }                        }                       catch (exception e){                           toast.maketext(getapplicationcontext(),"server error!..",toast.length_short).show();                        }                     }               }, new response.errorlistener() {           @override           public void onerrorresponse(volleyerror error) {               volleylog.e("from on error response server error..: ", error.getmessage());   if(progressdialog.isshowing){  progressdialog.cancel();    }           }       });        appcontroller.getinstance().addtorequestqueue(req); 

i hope helps , no need of asynctask.