Android progress dialoge view not showing -

i have developed simple asynctask class takes handlers parameters , whilst sending handlersendemptymessage(0) in dobackground load progressdialoge loading view reason doesnt show until end of executing stuff thats inside handler object (in other words progressdialogue blinks @ end).

here asynctask:

package com.kc.util;  import android.app.progressdialog; import android.content.context; import android.os.asynctask; import android.os.handler; import android.util.log;  public class loaddialoge extends asynctask<handler, integer, void> {      private progressdialog progressdialog;     private string tag = "loaddialoge";     private context mcontext;      @override     protected void onpostexecute(void result) {         // todo auto-generated method stub         super.onpostexecute(result);         progressdialog.dismiss();     }      @override     protected void onpreexecute() {         // todo auto-generated method stub         super.onpreexecute();         showwait();     }      @override     protected void doinbackground(handler... params) {         // todo auto-generated method stub         for(handler mhandler : params){             mhandler.sendemptymessage(0);             log.d(tag, "handler sending message" );         }         return null;     }      private void showwait() {         log.d(tag, "showwait");         progressdialog = new progressdialog(mcontext);         progressdialog.settitle("retrieving contact details");         progressdialog.setmessage("please wait...");         progressdialog.setprogressstyle(progressdialog.style_spinner);         progressdialog.show();         log.d(tag, "    ");     }      public void setmcontext(context mcontext) {         this.mcontext = mcontext;     }    } 

and here handler passed class activity:

private handler mhandler = new handler() {          @override         public void handlemessage(message msg) {             // todo auto-generated method stub             super.handlemessage(msg);             log.d(tag, "handlemessage");             initialiseonitemclicklisteners();             initialiseonclicklisteners();             initialiselistviewadapters();             loaddatatodb();             initializetitles();             initialize();         }      };      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.abstract_main_menu);          loaddialoge load = new loaddialoge();         load.setmcontext(this);         load.execute(mhandler);      } 

im trying create generic async load screen works across activity wants use instead of copying , pasting above loaddialogue asynctask across each activity(which doing before , worked fine).

not surprising "blinks" it? doinbackground() nothing @ all... task complete instantly. try using sendemptymessagedelayed() instead of sendemptymessage() if want fake there's processing or waiting going on in background task.