android ADT template EfficientListAdapter

gistfile1.java

public class ItemAdapter extends BaseAdapter
{
    
    // TODO replace with a collection of real data
    private static final List<DummyItem> DATA = DummyItemContent.ITEMS;
    
    private LayoutInflater mInflater;
    
    public ItemAdapter(Context context)
    {
        // Cache the LayoutInflate to avoid asking for a new one each time.
        mInflater = LayoutInflater.from(context);
        
    }
    
    /**
     * @see android.widget.ListAdapter#getCount()
     */
    public int getCount()
    {
        return DATA.size();
    }
    
    /**
     * @see android.widget.ListAdapter#getItem(int)
     */
    public Object getItem(int position)
    {
        return DATA.get(position);
    }
    
    /**
     * Use the array index as a unique id.
     * 
     * @see android.widget.ListAdapter#getItemId(int)
     */
    public long getItemId(int position)
    {
        return position;
    }
    
    /**
     * Make a view to hold each row.
     * 
     * @see android.widget.ListAdapter#getView(int, android.view.View,
     *      android.view.ViewGroup)
     */
    public View getView(int position, View convertView, ViewGroup parent)
    {
        // A ViewHolder keeps references to children views to avoid unneccessary
        // calls
        // to findViewById() on each row.
        ViewHolder holder;
        
        // When convertView is not null, we can reuse it directly, there is no
        // need
        // to reinflate it. We only inflate a new View when the convertView
        // supplied
        // by ListView is null.
        if (convertView == null)
        {
            convertView = mInflater.inflate(R.layout.list_item_item, parent,
                                            false);
            
            // Creates a ViewHolder and store references to the two children
            // views
            // we want to bind data to.
            holder = new ViewHolder();
            // TODO store references to your views
            holder.title = (TextView) convertView.findViewById(R.id.title);
            holder.subtitle = (TextView) convertView
                    .findViewById(R.id.subtitle);
            holder.thumbnail = (ImageView) convertView
                    .findViewById(R.id.thumbnail);
            
            convertView.setTag(holder);
        }
        else
        {
            // Get the ViewHolder back to get fast access to the TextView
            // and the ImageView.
            holder = (ViewHolder) convertView.getTag();
        }
        
        // TODO Bind your data efficiently with the holder.
        holder.title.setText(DATA.get(position).content);
        holder.subtitle.setText(DATA.get(position).content);
        holder.thumbnail.setImageResource(DATA.get(position).thumbnail);
        
        return convertView;
    }
    
    static class ViewHolder
    {
        // TODO define members for each view in the item layout
        TextView title;
        
        TextView subtitle;
        
        ImageView thumbnail;
    }
    
}