java - No data available listview -

i ran problem creating listview in android app.

this code:

public class mainactivity extends listactivity { private simpleadapter emadapter;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      // set layout view     setcontentview(r.layout.main_ui_layout);     final utility utility = new utility(this);     utility.getfiles();     final listview filelistview = (listview) findviewbyid(android.r.id.list);     filelistview.setemptyview(findviewbyid(r.id.progressbar));      // create hashmap items     final arraylist<hashmap<string, string>> listitems = new arraylist<hashmap<string, string>>();      // using thread simulate download of data     thread emthread = new thread(new runnable() {          public void run() {             // waiting 3s             try {                 thread.sleep(2500);             } catch (interruptedexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }              // looping through item nodes <item>              (int em = 0; em < utility.filemap.size(); em++) {                  hashmap<string, string> emmap = new hashmap<string, string>();                 file files = new file(utility.filemap.get("duroodsharif"));                 emmap.put(files.getname(), utility.filemap.get("duroodsharif"));                 listitems.add(emmap);             }         }     });     // stop progress bar     utility.stopprogressbar();      // adding listitems listview     emadapter = new simpleadapter(this, listitems, r.layout.list_item, new string[] { getstring(r.string.title_id),             getstring(r.string.description_id) }, new int[] { r.id.title, r.id.desciption });      runonuithread(new runnable() {          @override         public void run() {             // set list adapter             filelistview.setadapter(emadapter);           }     });     emthread.start();      // later there's no data     thread mythread = new thread(new runnable() {          public void run() {             // waiting 3s             try {                 thread.sleep(1000);             } catch (interruptedexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }              listitems.clear();              runonuithread(new runnable() { // run on ui thread setthe                                             // adapter list                 public void run() {                     filelistview.setemptyview(findviewbyid(r.id.emptytext));                     emadapter.notifydatasetchanged();                  }             });         }     });      mythread.start();      // selecting single listview item     listview emlistview = getlistview();      emlistview.setonitemclicklistener(new onitemclicklistener() {          @override         public void onitemclick(adapterview<?> parent, view view, int position, long id) {              // getting values selected listitem             string title = ((textview) view.findviewbyid(r.id.title)).gettext().tostring();             string description = ((textview) view.findviewbyid(r.id.desciption)).gettext().tostring();              // starting new intent             intent in = new intent(getapplicationcontext(), singlemenuitemactivity.class);             in.putextra(getstring(r.string.title_id), title);             in.putextra(getstring(r.string.description_id), description);              startactivity(in);          }     });  } 

and layout file

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/app_background_portrait_type2" android:orientation="vertical" >  <listview     android:id="@android:id/list"     android:layout_width="fill_parent"     android:layout_height="fill_parent" />  <progressbar     android:id="@+id/progressbar"     style="?android:attr/progressbarstylelarge"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_gravity="center"     android:visibility="gone" />  <textview     android:id="@+id/emptytext"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_gravity="center"     android:text="no data available"     android:visibility="gone" /> 

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what trying achieve showing progress bar till listview not filled data progress bar displaying continuously. adding name of mp3 file asset folder in map , adding map in listitems , till process going showing progress bar.

can point me right direction?

thanks in advance.

as exception stands, can not call wait() , notify()/notifyall() without synchronized block.

probably want call emadapter.notifydatasetchanged() instead of emadapter.notifyall();

object.notifyall() wake thread waiting on object. need?