android - E/RecyclerView: No adapter attached; skipping layout with fragments -

this first application in android studio , can´t resolve error, need help, thanks.

e/recyclerview: no adapter attached; skipping layout e/recyclerview: no adapter attached; skipping layout 

mainactivity

public class mainactivity extends appcompatactivity { private viewpager mpager; private slidingtablayout mtabs; private toolbar toolbar; private recyclerview recyclerview;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);        //toolbar     toolbar= (toolbar) findviewbyid(r.id.toolbar);     setsupportactionbar(toolbar);      //sliding tab     mpager = (viewpager) findviewbyid(r.id.pager);     mtabs= (slidingtablayout) findviewbyid(r.id.tabs);     mpager.setadapter(new myadapter(getsupportfragmentmanager(),this));       mtabs.setdistributeevenly(true);     mtabs.setcustomtabview(r.layout.tab_view, r.id.tabteks);     mtabs.setbackgroundcolor(getresources().getcolor(r.color.colorprimary));     mtabs.setselectedindicatorcolors(getresources().getcolor(r.color.coloraccent));      mtabs.setviewpager(mpager);  } 

my adapter

public class myadapter extends fragmentpageradapter { private context mcontext; private string[] titles ={"overview","portofolio","team"}; int [] icons = new int []{r.mipmap.ic_adopcion, r.mipmap.ic_launcher, r.mipmap.ic_launcher}; private int heighticon;  public myadapter(fragmentmanager fm, context c) {     super(fm);     mcontext=c;     double scale=c.getresources().getdisplaymetrics().density;     heighticon=(int)(30*scale+0.5f); }  @override public fragment getitem(int position) {     fragment frag=null;     if (position==0){         frag = new overviewfragment();     } else if(position==1){         frag= new teamfragment();      } else if(position==2){         frag = new portofoliofragment();     }     bundle b = new bundle();     b.putint("position", position);     frag.setarguments(b);     return frag; }  @override public int getcount() {      return titles.length; }  @override public charsequence getpagetitle(int position) {     drawable d = mcontext.getresources().getdrawable(icons[position]);     d.setbounds(0,0,heighticon,heighticon);      imagespan = new imagespan(d);     spannablestring sp = new spannablestring(" ");     sp.setspan(is,0,sp.length(), spanned.span_exclusive_exclusive);     return (sp); } 

itemadapter

public class itemadapter extends recyclerview.adapter<itemholder> { private list<perros> perroslist;  public itemadapter(list<perros> perroslist){     this.perroslist = perroslist; } @override public itemholder oncreateviewholder(viewgroup parent, int viewtype) {     view itemview = layoutinflater.from(parent.getcontext())             .inflate(r.layout.item_layout, parent, false);     return new itemholder(itemview); }  @override public void onbindviewholder(itemholder holder, int position) {     perros item = perroslist.get(position);     holder.txtcelebname.settext(item.getname());     holder.txtcelebmovie.settext(item.getfamousmovie());     picasso.with(holder.txtcelebname.getcontext()).load(item.getprofilephotolocation()).into(holder.profileimage);     picasso.with(holder.txtcelebname.getcontext()).load(item.getimgsex()).into(holder.imgsex); }  @override public int getitemcount() {     return perroslist.size();  } 

fragment

    @override public view oncreateview(layoutinflater inflater, viewgroup container,                          bundle savedinstancestate) {     // inflate layout fragment      view rootview = inflater.inflate(r.layout.fragment_overview, container, false);     //return inflater.inflate(r.layout.fragment_overview, container, false);      recyclerview = (recyclerview) rootview.findviewbyid(r.id.recycler_view);     recyclerview.setlayoutmanager(new linearlayoutmanager(getactivity()));     mrequestqueue = mysingleton.getinstance().getrequestqueue();     array = new jsonobjectrequest(request.method.get, url, "", new response.listener<jsonobject>() {         @override         public void onresponse(jsonobject response) {             log.d(tag, response.tostring());             itemadapter = new itemadapter(getperros(response));             recyclerview.setadapter(itemadapter);         }     }, new response.errorlistener() {         @override         public void onerrorresponse(volleyerror error) {         log.d(tag,error.tostring());         }     });     mrequestqueue.add(array);     return rootview;     //return inflater.inflate(r.layout.fragment_overview, container, false); } private list<perros> getperros(jsonobject jsonobject){     list<perros> lista = new arraylist<>();     try {         jsonarray array= jsonobject.getjsonarray("alumnos");         (int i=0; i<array.length(); i++){             jsonobject objeto = array.getjsonobject(i);             perros perro = new perros();             perro.setname(objeto.getstring("nombre"));             perro.setfamousmovie(objeto.getstring("direccion"));             perro.setprofilephotolocation(img+objeto.getstring("rutaimagen"));             perro.setimgsex(img+objeto.getstring("sexo"));             lista.add(perro);         }     } catch (jsonexception e) {         e.printstacktrace();     }     return lista; } 

you need set blank adapter before data in arrayadapter in oncreate() method. first of put below line in itemadapter in getitemcount() method.

return (null != perroslist ? perroslist.size() : 0);