android - Search through RecyclerView using Searchview

Question

I want to search through RecyclerView, I have List<BaseOfCards> (BaseOfCards is my getter&setter class) My RecyclerViewAdapter :

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder> {


private LayoutInflater inflater;
private List<BaseOfCards> items;

//private int itemLayout;
//String cardvalue;
private Activity mActivity;

public RecyclerViewAdapter(Activity mActivity, Context context, List<BaseOfCards> items) {
    this.mActivity = mActivity;
    inflater = LayoutInflater.from(context);
    this.items = items;
    //this.itemLayout = itemLayout;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View view = inflater.inflate(R.layout.custom_row, parent, false);
    MyViewHolder holder = new MyViewHolder(view, mActivity);
    return holder;
}

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {

    BaseOfCards item = items.get(position);
    holder.title.setTag(item);
    holder.title.setText(item.getCardName());
}

@Override
public int getItemCount() {

    return items.size();
}

public static class MyViewHolder extends RecyclerView.ViewHolder {
    private Activity mActivity;
    TextView title;
    ImageView titileImageView;

    public MyViewHolder(View itemView, Activity mActivity) {

        super(itemView);

        titileImageView = (ImageView) itemView.findViewById(R.id.image_country);


        title = (TextView) itemView.findViewById(R.id.listText);
        this.mActivity = mActivity;

    }
}

}

I add SearchView to my menu and initialize it in MainActivity:

 MenuItem menuItem = menu.findItem(R.id.action_search1);
    searchView = (SearchView) MenuItemCompat.getActionView(menuItem);
    SearchManager manager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    searchView.setIconifiedByDefault(true);

What do I need to do next? Make my RecyclerViewAdapter implement Filterable or what? Or just make class filter in *RecyclerViewAdapter** and just call it from my MainActivity ?

Answer 1

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;
   }