Simple Search Adapter

SearchAdapter.java

import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
 * Custom Search Adapter
 * Created by oyewale
 */
public class SearchAdapter extends RecyclerView.Adapter<SearchAdapter.ViewHolder> implements Filterable {

    private Context mContext;
    private List<SearchEntity> itemList;
    private List<SearchEntity> subItems;

    public PeopleListAdapter(Context context){
        this.mContext = context;
        itemList = getItemList(); // load your dataset
        subItems = itemList;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new ViewHolder(LayoutInflater.from(parent.getContext()).inflate(
                R.layout.row_search_item, parent, false
        ));
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        final SearchEntity item = subItems.get(position);
        holder.item.setText(item.getText());
        
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //handle onClick here
            }
        });
    }

    @Override
    public int getItemCount() {
        return subItems.size();
    }

    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults results = new FilterResults();
                List<SearchItem> filterList = new ArrayList<>();

                if (constraint != null && constraint.toString().length() > 0) {

                    for (int index = 0; index < itemList.size(); index++) {
                        SearchItem item = itemList.get(index);
                        String itemText = item.getText();

                        if (itemText.toLowerCase().startsWith(constraint.toString().toLowerCase())) {
                            filterList.add(item);
                        }
                    }
                    results.values = filterList;
                    results.count = filterList.size();
                } else {
                    synchronized (itemList) {
                        results.values = itemList;
                        results.count = itemList.size();
                    }
                }
                return results;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                subItems = (ArrayList<SearchItem>) results.values;
                notifyDataSetChanged();
            }
        };
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView item;

        public ViewHolder(View itemView) {
            super(itemView);
            item = (TextView) itemView.findViewById(R.id.text_view);
        }


    }
}