ViewHolder Pattern

OfferAdapter

package in.mally.volleytest;

import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class OfferAdapter extends ArrayAdapter<Offer> {
    // View lookup cache
    private static class ViewHolder {
        TextView offerMain;
        TextView offerDesc;
    }

    public OfferAdapter(Context context) {
       super(context, R.layout.offer_view);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
       // Get the data item for this position
       Offer offer = getItem(position);    
       // Check if an existing view is being reused, otherwise inflate the view
       ViewHolder viewHolder; // view lookup cache stored in tag
       if (convertView == null) {
          viewHolder = new ViewHolder();
          LayoutInflater inflater = LayoutInflater.from(getContext());
          convertView = inflater.inflate(R.layout.offer_view, null);
          viewHolder.offerMain = (TextView) convertView.findViewById(R.id.offerMainTextView);
          viewHolder.offerDesc = (TextView) convertView.findViewById(R.id.offerDescTextView);
          convertView.setTag(viewHolder);
       } else {
           viewHolder = (ViewHolder) convertView.getTag();
       }
       // Populate the data into the template view using the data object
       viewHolder.offerMain.setText(offer.getOfferHead());
       viewHolder.offerDesc.setText(offer.getOfferDesc());
       // Return the completed view to render on screen
       return convertView;
   }
}