Search through RecyclerView using Searchview

I solved my problem

1. Make my class RecyclerViewAdapter implements Filterable

2. Add line private List<BaseOfCards> orig;

3. Add method getFilter in RecyclerViewAdapter

   public Filter getFilter() {
   return new Filter() {
       @Override
       protected FilterResults performFiltering(CharSequence constraint) {
           final FilterResults oReturn = new FilterResults();
           final List<BaseOfCards> results = new ArrayList<BaseOfCards>();
           if (orig == null)
               orig  = items;
               if (constraint != null){
                   if(orig !=null & orig.size()>0 ){
                       for ( final BaseOfCards g :orig) {
                           if (g.getCardName().toLowerCase().contains(constraint.toString()))results.add(g);
                       }
                   }
                   oReturn.values = results;
               }
               return oReturn;
           }
   
   @Override
       protected void publishResults(CharSequence constraint, FilterResults results) {
           items = (ArrayList<BaseOfCards>)results.values;
           notifyDataSetChanged();
   
       }
   }; 
   

4. Make MainActivity implements SearchView.OnQueryTextListener and change method onQueryTextChange :

   @Override
   public boolean onQueryTextChange(String newText) {
       if ( TextUtils.isEmpty ( newText ) ) {
           adapter.getFilter().filter("");
       } else {
           adapter.getFilter().filter(newText.toString());
       }
       return true;
   }
   

I want to add to ololoking answer. In MainActivity we should also add next code so it would work:

   @Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_layout, menu);

    MenuItem searchItem = menu.findItem(R.id.action_search);
    SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
    SearchManager manager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    searchView.setIconifiedByDefault(true);
    searchView.setOnQueryTextListener(this);
    return super.onCreateOptionsMenu(menu);

}

Thanks ololoking for your answer. It helped me.