android - RecyclerView with firebase remains blank sometimes, but shows items sometimes -


this question has answer here recyclerview not updated new data not working me. dont understand why recyclerview shows items won't show. i'm using 4 framents viewpager. not internet issue since other fragments display data internet. have tried using firebaserecycler adapter , custom adapter , listview in place of recyclerview. here code fragement. please me.

public class fragmenttips extends fragment {     public recyclerview recyclerlistview;     public myrecycleradapter myadapter;     databasereference databasereference;     textview loading;     view v;     swiperefreshlayout refresher;     list<model> listposts = new arraylist<>();      @override     public view oncreateview(layoutinflater inflater, @nullable viewgroup container, @nullable bundle savedinstancestate) {         v = inflater.inflate(r.layout.activity_home, container, false);          databasereference = firebasedatabase.getinstance().getreference();         creatinglayouts();          final nativeexpressadview adview = (nativeexpressadview) v.findviewbyid(r.id.adview);         adview.loadad(new adrequest.builder().build());         adview.setadlistener(new adlistener() {             @override             public void onadloaded() {                 adview.setvisibility(view.visible);             }         });          return v;     }      public void creatinglayouts() {          refresher = (swiperefreshlayout) v.findviewbyid(r.id.refresher);         //refresher.setrefreshing(true);         refresher.setcolorschemeresources(r.color.blue, r.color.lightblue, r.color.deeppurple, r.color.purple, r.color.pink, r.color.orange, r.color.red);         refresher.setonrefreshlistener(new swiperefreshlayout.onrefreshlistener() {             @override             public void onrefresh() {                 if (myadapter != null) {                     updateadapter();                  }             }         });         loading = (textview) v.findviewbyid(r.id.loading);          recyclerlistview = (recyclerview) v.findviewbyid(r.id.recycler);         recyclerlistview.sethasfixedsize(false);         recyclerlistview.setlayoutmanager(new linearlayoutmanager(getactivity()));          myadapter = new myrecycleradapter(getcontext());         updateadapter();         recyclerlistview.setadapter(myadapter);      }       //update adapter     public void updateadapter() {           listposts.clear();         databasereference.child("winbet").addchildeventlistener(new childeventlistener() {             @override             public void onchildadded(datasnapshot datasnapshot, string s) {                 listposts.add(datasnapshot.getvalue(model.class));                 displayposts(listposts);             }              @override             public void onchildchanged(datasnapshot datasnapshot, string s) {              }              @override             public void onchildremoved(datasnapshot datasnapshot) {              }              @override             public void onchildmoved(datasnapshot datasnapshot, string s) {              }              @override             public void oncancelled(databaseerror databaseerror) {                 toast.maketext(getcontext(), "canceled", toast.length_short).show();             }         });       }       public void displayposts(list<model> ls) {         refresher.setrefreshing(false);         loading.setvisibility(view.gone);         recyclerlistview.setvisibility(view.visible);         myadapter.setdata(ls);         myadapter.notifydatasetchanged();     }   }

thank guys. found solution finally. isn't related code. if ever faces such issue. problem was using free firebase plan , connections allowed 100, reaching peak since have many users. solution upgrade


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