Android中ViewHolder模式超简洁写法（一劳永逸）

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

import android.util.SparseArray;
import android.view.View;

/**
* File_name com.dy.logs.mp.utill.ViewHolder
*
* @author linglongxin24 <br/>
* @date create at 2014-6-11下午6:03:15 <br/>
* @time update at 2014-6-11下午6:03:15
*/
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

@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;