android - Retrieving data inside of RecyclerView -

i want create card view inside recycler view.

i got problem.i can't retrieve data inside of card views.

i want whenever check box true, data(meal, price, , count in example (1)) , add list in main activity.

i stuck on 6 hour straight. if know solution please help. dying on here.

mainactivity:

public class mainactivity extends appcompatactivity {     recyclerview recyclerview;     carddata data;     list<carddata> list=new arraylist<>();      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         hawk.init(getapplicationcontext()).build();          data = new carddata("meal","1","12","http");         list.add(data);          recyclerview=(recyclerview)findviewbyid(r.id.recycler_view);         recyclerview.setitemanimator(new defaultitemanimator());         recyclerview.sethasfixedsize(true);          recyclerview.layoutmanager layoutmanager=new linearlayoutmanager(this);         recyclerview.setlayoutmanager(layoutmanager);          final recyclerview.adapter adapter=new myadapter(getapplicationcontext(),list);         recyclerview.setadapter(adapter);        } } 

adapter:

public class myadapter extends recyclerview.adapter<myadapter.myviewholder> {     private list<carddata> data;       private context context;     public myadapter(context context,list<carddata> data){         this.data=data;         this.context = context;     }      @override     public myviewholder oncreateviewholder(viewgroup viewgroup, int i) {         view v= layoutinflater.from(viewgroup.getcontext()).inflate(r.layout.card_contents,viewgroup,false);         return new myviewholder(v);     }      @override     public void onbindviewholder(final myviewholder myviewholder, final int i) {            myviewholder.meal.settext(data.get(i).yemek);         myviewholder.price.settext(data.get(i).qiymet);         //glide.with(context).load(data.get(i).url).into(myviewholder.img);          myviewholder.count.gettext();          myviewholder.card.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view view) {                  myviewholder.checkbox.setchecked(!myviewholder.checkbox.ischecked());                 data.get(i).checked = myviewholder.checkbox.ischecked();             }         });           myviewholder.add.setfocusable(true);         myviewholder.remove.setfocusable(true);          myviewholder.add.setonclicklistener(new view.onclicklistener(){             @override             public void onclick(view v) {                  string counts = myviewholder.count.gettext().tostring();                 int counti = integer.valueof(counts);                 counti += 1;                  string countn = string.valueof(counti);                 myviewholder.count.settext(countn);              }         });          myviewholder.remove.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view view) {                  string says = myviewholder.count.gettext().tostring();                 int sayi = integer.valueof(says);                 if (sayi>0){                 sayi -= 1;}                  string sayn = string.valueof(sayi);                 myviewholder.count.settext(sayn);              }         });       }      @override     public int getitemcount() {         return data.size();     }      public static class myviewholder extends recyclerview.viewholder{          textview meal;         textview price;         textview count;         cardview card;          imageview img;          checkbox checkbox;          button add;         button remove;         myviewholder(view view){             super(view);             this.meal = (textview) view.findviewbyid(r.id.meal);             this.price = (textview) view.findviewbyid(r.id.cost);             this.count = (textview) view.findviewbyid(r.id.count);             this.add = (button) view.findviewbyid(r.id.addbutton);             this.remove = (button) view.findviewbyid(r.id.removebutton);             this.checkbox = (checkbox) view.findviewbyid(r.id.checkbox);             this.img = (imageview) view.findviewbyid(r.id.img);             this.card = (cardview) view.findviewbyid(r.id.card_view);           }     } } 

data:

public class carddata {      public carddata() {     }      public string meal;     public string portion;     public string cost;     public string url;     public boolean checked;      public carddata(string meal, string portion, string cost, string url) {         meal = meal;         portion = portion;         cost = cost;         this.url = url;     }      public boolean ischecked() {         return checked;     }      public void setchecked(boolean checked) {         this.checked = checked;     }       public string getmeal() {         return meal;     }      public void setmeal(string meal) {         meal = meal;     }      public string getportion() {         return portion;     }      public void setportion(string portion) {         portion = portion;     }      public string getcost() {         return cost;     }      public void setcost(string cost) {         cost = cost;     }      public string geturl() {         return url;     }      public void seturl(string url) {         this.url = url;     } }