java ViewHolder的另一种写法。只需一个类通用好了，适配器里不用额外写...

Posted 2021-05-08

package com.atearsan.adapter;

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

/**
 * @author atearsan / 2015-07-22
 */
public class BaseViewHolder {
    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.setTag(viewHolder);
        }

        View childView = viewHolder.get(id);
        if (childView == null) {
            childView = view.findViewById(id);
            viewHolder.put(id, childView);
        }
        return (T) childView;
    }

    /*
    use:
    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;
    }
     */
}