Android点滴---ViewHolder通用，优雅写法

最近在做项目时，又要写 ViewHolder，

突然想到网上看看有没什么好的写法！

不知道你是不是也烦透了写那些没有技术含量的ViewHolder

看看这些，或许会有收获！

然后就找到了下面两篇文章（感谢分享！）：

ViewHolder超简洁写法 点击跳转

优雅的使用ViewHolder 点击跳转

然后自己整理的了， 保存起来，省的忘记，顺便分享一下！

第二种  优雅写法中有一点点小问题，应该是作者粗心！

直接贴代码了：

第一种：

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

/**
 * ViewHolder 的通用写法
 * 
 * 来自 : http://www.eoeandroid.com/thread-321547-1-1.html
 * 
 * @author LiuJinpeng
 *
 */
public class ViewHolder {
	
	private ViewHolder() {}

	@SuppressWarnings("unchecked")
	public static <T extends View>T getChildView(View convertView,int id) {
		
		SparseArray<View> viewHolder = (SparseArray<View>) convertView.getTag();
		
		if (viewHolder == null) {
			viewHolder = new SparseArray<View>();
			convertView.setTag(viewHolder);
		}
		
		View childView = viewHolder.get(id);
		
		if (childView == null) {
			childView = convertView.findViewById(id);
			viewHolder.put(id, childView);
		}
		
		return (T) childView;
	}
	
}

@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;
}

第二种：

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

/**
 * ViewHolder 优雅写法
 * 
 * 来自：http://stackvoid.com/using-adapter-in-efficiency-way/
 * 
 * @author LiuJinpeng
 *
 */
public class ViewHolder2 {

	private final SparseArray<View> views;
	
	private View convertView;
	
	private ViewHolder2(View convertView) {
		super();
		this.views = new SparseArray<View>();
		this.convertView = convertView;
		
		convertView.setTag(this);
	}
	
	public static ViewHolder2 getHolder(View convertView) {
		
		if (convertView.getTag() == null) {<span style="white-space:pre">	</span>//这里应该是作者粗心写错了，如果查看的是原文章记得修改
			return new ViewHolder2(convertView);
		}
		
		return (ViewHolder2) convertView.getTag();
	}

	@SuppressWarnings("unchecked")
	public <T extends View>T getChildView(int viewId) {
		View childView = views.get(viewId);
		
		if (childView == null) {
			childView = convertView.findViewById(viewId);
			views.put(viewId, childView);
		}
		
		return (T) childView;
	}

}

public View getView(int position, View convertView, ViewGroup parent) {
		if (convertView == null) {
			convertView = LayoutInflater.from(context).inflate(
					R.layout.good_list_item, null, false);
		}

		ViewHolder mViewHolder = ViewHolder.get(convertView);
		TextView price = mViewHolder.getView(R.id.price);
		// ...其他getView

		return convertView;
	}

base-adapter-helper 点击打开链接

暂时没时间研究，有兴趣的同学可以看一下！

从事Android开发不久，有问题，希望大家留言交流，共同成长！