ViewHolder本质上是一个静态类实例，你在创建视图时将其与视图关联，从而在运行时将要查找的子视图缓存起来。如果视图已经存在，请检索holder实例并使用其字段而不是调用findViewById。
在你的情况下：
@Overridepublic View getView(int position, View convertView, ViewGroup parent) { View v = convertView; ViewHolder holder; // to reference the child views for later actions if (v == null) { LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); v = vi.inflate(R.layout.mainrow, null); // cache view fields into the holder holder = new ViewHolder(); holder.nameText = (TextView) v.findViewById(R.id.nameText); holder.priceText = (TextView) v.findViewById(R.id.priceText); holder.changeText = (TextView) v.findViewById(R.id.changeText); // associate the holder with the view for later lookup v.setTag(holder); } else { // view already exists, get the holder instance from the view holder = (ViewHolder) v.getTag(); } // no local variables with findViewById here // use holder.nameText where you were // using the local variable nameText before return v;}// somewhere else in your class definitionstatic class ViewHolder { TextView nameText; TextView priceText; TextView changeText;}警告：我没有尝试编译它.
