listview searchview android doesn't do search -

so problem when type in won't search. need basic search when type letter or number filter it.

this adapter class:

public class knjigesearchadapter extends arrayadapter<knjiga> implements filterable{     context context;     private arraylist<knjiga> originalvalues;     private namefilter filter;     arraylist<knjiga> podaci = new arraylist<>();      public knjigesearchadapter(context context,arraylist<knjiga> knjigas){         super(context, 0, knjigas);         this.context = context;          this.podaci = knjigas;         this.originalvalues = new arraylist<>();         this.originalvalues.addall(podaci);     }      @override     public view getview(int position, view convertview, viewgroup parent) {         knjiga knjiga = getitem(position);          if (convertview == null){             convertview = layoutinflater.from(getcontext()).inflate(r.layout.search_knjiga_layout, parent, false);         }         textview tvnazivk = (textview)convertview.findviewbyid(r.id.textviewnazivknjige);         textview tvautork = (textview)convertview.findviewbyid(r.id.textviewautorknjige);         textview tvisbn = (textview)convertview.findviewbyid(r.id.textviewisbnknjige);         textview tvgodina = (textview)convertview.findviewbyid(r.id.textviewgodinaizdknjige);         textview tvkatk = (textview)convertview.findviewbyid(r.id.textviewkategorijaknjige);          tvnazivk.settext(knjiga.getnaziv());         tvautork.settext(knjiga.getautor());         tvisbn.settext(knjiga.getisbn());         tvgodina.settext(string.valueof(knjiga.getgodinaizdavanja()));         tvkatk.settext(knjiga.getkategorija());          return convertview;     }      @override     public filter getfilter() {         if(filter == null){             filter = new namefilter();         }         return filter;     }     private class namefilter extends filter{         @override         protected filterresults performfiltering(charsequence constraint) {             constraint = constraint.tostring().tolowercase();             filterresults results = new filterresults();             if(constraint != null && constraint.tostring().length() > 0)             {                 arraylist<knjiga> filtrirano = new arraylist<>();                  for(int = 0, l = originalvalues.size(); < l; i++)                 {                     knjiga knjiga = originalvalues.get(i);                     if(knjiga.tostring().tolowercase().contains(constraint))                         filtrirano.add(knjiga);                 }                 results.count = filtrirano.size();                 results.values = filtrirano;             }             else             {                 synchronized(this)                 {                     results.values = originalvalues;                     results.count = originalvalues.size();                 }             }             return results;         }         @suppresswarnings("unchecked")         @override         protected void publishresults(charsequence constraint,                                       filterresults results) {              podaci = (arraylist<knjiga>)results.values;             notifydatasetchanged();             clear();             for(int = 0, l = podaci.size(); < l; i++)                 add(podaci.get(i));             notifydatasetinvalidated();         }     }         } 

this activity class:

public class korisniksearchknjigeactivity extends appcompatactivity {     listview lvpretragaknjiga;     searchview svsearch;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_korisnik_search_knjige);         toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);         setsupportactionbar(toolbar);          floatingactionbutton fab = (floatingactionbutton) findviewbyid(r.id.fab);         fab.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view view) {                 snackbar.make(view, "replace own action", snackbar.length_long)                         .setaction("action", null).show();             }         });         pretragaknjiga();     }      @targetapi(build.version_codes.honeycomb)     public void pretragaknjiga() {         lvpretragaknjiga = (listview) findviewbyid(r.id.listviewlistaknjiga);         svsearch = (searchview) findviewbyid(r.id.searchviewsearch);          mydbhelper helper = new mydbhelper(this);         final knjigesearchadapter adapter = new knjigesearchadapter(this, helper.getallknjige());         lvpretragaknjiga.setadapter(adapter);          svsearch.setonquerytextlistener(                 new searchview.onquerytextlistener() {                     @override                     public boolean onquerytextsubmit(string query) {                         return false;                     }                      @override                     public boolean onquerytextchange(string newtext) {                         adapter.getfilter().filter(newtext);                         return true;                     }                 }         );      } } 

the problem might you're filtering comparing kijiga.tostring() typed, , doesn't have "content" string think has. see tostring returns, like: "[kijiga#1345]". instead of tostring, might want use getter. or override tostring.

also try change:

    public boolean onquerytextsubmit(string query) {           adapter.getfilter().filter(query);           return true;     } 

and imho there's bug in emulator, not work (depending on hw keyboard settings), test on real device!