The Adapter of ListView: Just adapt data to view, don’t do anything else

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List<Data> dataList;

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@Override
public View getView(int position, View convertView, ViewGroup parent) {
ItemViewHolder item = null;

if(convertView == null) {
item = new ItemViewHolder(context);
convertView = item.getLayoutView();
} else {
item = (ItemViewHolder)convertView.getTag();
}

item.setItemData(dataList.get(position));

return convertView;
}

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public class ItemViewHolder {

//The layout View of the item of the ListView.
private View layoutView = null;
//The member Views to display data.
private TextView textView = null;
private ImageView imageView = null;
… …

public ItemViewHolder (Context context) {
super(context);

initUI();
}

public View getLayoutView() {
return layoutView;
}

public void setItemData(Data data) {
textView.setText(data.getText());
imageView.setImage(data.getImage());
… …
}

private void initUI() {
LayoutInflater inflater = LayoutInflater.from(mContext);
layoutView = inflater.inflate(R.layout.item_view_layout, null);
//
textView = (TextView) layoutView.findViewById(R.id.textview);
imageView = (ImageView)layoutView.findViewById(R.id.imageview);
//This is the most important code.
layoutView.setTag(this);
}
}