performance - Android : how to implement PullToRefreshListView in proper way -

i new android , start learning how implement pulltorefreshlistview using library of chrisbanes. can guys please explain me, should put code call api getting data, , part should set the(imagebitmap) after data (image url) api. know, should in background avoid ui freeze when loading image ui, not sure. please help.

the following sample code library: please explain me should in getdatatask , onpostexecute. in case loading image.

@override public void onrefresh(pulltorefreshbase<listview> refreshview) {     // work refresh list here.     new getdatatask().execute(); }  private class getdatatask extends asynctask<void, void, string[]> {      @override     protected string[] doinbackground(void... params) {         // simulates background job.         try {             thread.sleep(4000);         } catch (interruptedexception e) {         }         return mstrings;     }      @override     protected void onpostexecute(string[] result) {         mlistitems.addfirst("added after refresh...");         madapter.notifydatasetchanged();          // call onrefreshcomplete when list has been refreshed.         mpullrefreshlistview.onrefreshcomplete();          super.onpostexecute(result);     } } 

sorry newbie question, jsust want confirm in order follow standard. sorry bad english

i think should put getdatatask in separated class listener. example of listener can have:

public abstract class remotecalllistener implements iremotecalllistener {  @override public abstract void onstring(string s); //string example.  @override public abstract void onerror(exception e); } 

you should give listener constructor if async task.

private class getdatatask extends asynctask<void, void, string[]> {  remotecalllistener listener; public getdatatask(){  }  public getdatatask(remotecalllistener listener){ this.listener = listener; }  @override protected string[] doinbackground(void... params) {     // simulates background job.     try {         thread.sleep(4000);     } catch (interruptedexception e) {     }     return mstrings; }  @override protected void onpostexecute(string[] result) { listener.onstring(result);     // mlistitems.addfirst("added after refresh...");     // madapter.notifydatasetchanged();      // call onrefreshcomplete when list has been refreshed.     // mpullrefreshlistview.onrefreshcomplete();      super.onpostexecute(result);     } } 

to make instance of call should like

 getdatatask task = new getdatatask(yourlistener);  task.execute("your link"); 

and in 'controller'class should make instance of remotecalllistener , when onstring called:

   mlistitems.addfirst("added after refresh...");     madapter.notifydatasetchanged();      // call onrefreshcomplete when list has been refreshed.     mpullrefreshlistview.onrefreshcomplete(); 

you can freeze ui dialogs class android. example given here:

public final static progressdialog showloading(context c, string title,         string message, boolean indeterminate) {     progressdialog p = new progressdialog(c);     p.settitle(title);     p.setmessage(message);     p.setcancelable(false);     p.setindeterminate(indeterminate);     if (!indeterminate) {         // p.setprogressdrawable( c.getresources().getdrawable(         // r.drawable.progress ) );         p.setprogressstyle(progressdialog.style_horizontal);         p.setprogress(0);         p.setmax(100);     }     p.show();     return p; } 

but dont forget close dialog!

you can contact me anytime if have further questions