android - populating RecyclerView from AsyncTask fails and results in empty Screen -

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trying populate data recyclerview cloud, though output in main thread, takes time, decided add asynctask load items ease , insert progressdialog, seems code has no effect, getting empty screen.

but asynctask getting executed, able log items in logcat, no idea why don't recyclerview. here code use , looking help:

public class bigboard extends actionbaractivity {  private list<person> persons; private recyclerview rv; private rvadapter adapter; private string a,b; private progressdialog pr;     @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     parse.initialize(this, "app-id", "client-key");     setcontentview(r.layout.activity_big_board);      loader abc = new loader();     abc.execute();     adapter = new rvadapter(persons);     rv=(recyclerview)findviewbyid(r.id.rv);      linearlayoutmanager llm = new linearlayoutmanager(this);     rv.setlayoutmanager(llm);     rv.sethasfixedsize(true);    }    private class loader extends asynctask<string, integer, string> {      @override     protected void onpreexecute() {         pr = new progressdialog(bigboard.this);         pr.setprogressstyle(progressdialog.style_spinner);         pr.setindeterminate(true);         pr.setcancelable(false);         pr.setmessage("loading board");         pr.show();         super.onpreexecute();     }      @override     protected void onprogressupdate(integer... values) {         super.onprogressupdate(values);      }      @override     protected string doinbackground(string... urls) {         initializedata();          initializeadapter();           return null;      }      @override     protected void onpostexecute(string result) {         pr.dismiss();      }      private void initializedata(){         persons = new arraylist<>();           parsequery<parseobject> query = new parsequery<parseobject>("bigboard");         query.findinbackground(new findcallback<parseobject>() {             public void done(list<parseobject> credentiallist, parseexception e) {                 if (e == null) {                     for(int i=0;i<credentiallist.size();i++)                     {                         a=credentiallist.get(i).getstring("location");                         b=credentiallist.get(i).getstring("feed");                         persons.add(new person(a,b));                            log.d("out", "so val::------> " +a +b);                       }                 } else {                     log.d("score", "error: " + e.getmessage());                 }                  adapter.notifydatasetchanged();             }         });      }      private void initializeadapter(){          rv.setadapter(adapter);     }  }   }

place adapter.notifydatasetchanged(); or rv.setadapter(adapter); onpostexecute.. since onopostexecute works on ui thread.

edit : create function inside adapter

public void updatepersons(list<person> persons) {     this.persons = persons;     notifydatasetchanged(); }

after filling list in onpostexecute call function list.


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