ViewHolder简洁写法

摘要 ViewHolder这么写（只提供一个静态方法，其实可以加一个私有构造函数防止外部实例化），代码很简单，看过就明白了

ListView ViewHolder Adapter

ViewHolder这么写（只提供一个静态方法，其实可以加一个私有构造函数防止外部实例化），代码很简单，看过就明白了

public class ViewHolder {

// I added a generic return type to reduce the casting noise in client code@SuppressWarnings("unchecked")public static <T extends View> T get(View view, int id) {    SparseArray<View> viewHolder = (SparseArray<View>) view.getTag();    if (viewHolder == null) {        viewHolder = new SparseArray<View>();        view.setTag(viewHolder);    }    View childView = viewHolder.get(id);    if (childView == null) {        childView = view.findViewById(id);        viewHolder.put(id, childView);    }    return (T) childView;}

}

在getView里这样写

@Override 
public View getView(int position, View convertView, ViewGroup parent) {

if (convertView == null) {    convertView = LayoutInflater.from(context)      .inflate(R.layout.banana_phone, parent, false);}ImageView bananaView = ViewHolder.get(convertView, R.id.banana);TextView phoneView = ViewHolder.get(convertView, R.id.phone);BananaPhone bananaPhone = getItem(position);phoneView.setText(bananaPhone.getPhone());bananaView.setImageResource(bananaPhone.getBanana());return convertView;

}