Optimized way to use getView method in Adapter

Question

I understand, calling every time view.findViewById(R.id.title); is much costly operation. How can i optimize this by storing these int values. What is the optimized way to use in List Adapter?

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;
        final DataObject dataObject = getItem(position);
        if (view == null) {
        // No view created yet
        LayoutInflater layoutInflater = LayoutInflater.from(getContext());
        view = layoutInflater.inflate(layoutResourceId, parent, false);
        }
        if (view != null) {
        TextView title = (TextView) view.findViewById(R.id.title);
        TextView price = (TextView) view.findViewById(R.id.price);
        ImageView img = (ImageView) view.findViewById(R.id.profile_pic);
        RatingBar overallRating = (RatingBar)                                                 view.findViewById(R.id.overall_rating);

score 1 · Accepted Answer · answered Mar 14 '15 at 18:43

you should use viewholder like this:

ViewHolder holder;

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    if (convertView == null) {
        holder = new ViewHolder();
        convertView = inflater.inflate(R.layout.chocolate_list_item,
                parent, false);
        holder.txtvwChocolateName = (TextView) convertView
                .findViewById(R.id.xtxtvwChocolateName);
        holder.imgvwChocolateIcon=(ImageView)convertView.findViewById(R.id.ximgvwChocolateIcon);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.txtvwChocolateName.setText(alChocolate.get(position)
            .getStrChocolateName());
    holder.imgvwChocolateIcon.setImageResource(images[position]);
    return convertView;
}

class ViewHolder {
    TextView txtvwChocolateName;
    ImageView imgvwChocolateIcon;
}

Optimized way to use getView method in Adapter

1 Answers1