设置在onClickListener getview（）与ViewHolder类 [英] set onClickListener in getview() with ViewHolder class

问题描述

我有延伸BaseAdapter的自定义列表适配器。
我创建了一个holder类标记我为了看法，避免夸大已经存在的意见。

I have a custom list adapter that extends BaseAdapter. I create a holder class to tag my views in order to avoid inflating views that already exist.

static class ViewHolder{
    TextView tvName;
    TextView tvDescription;
    Button   btAdd;
}

在我getView我有财产以后这样的：

and in my getView i have somthing like this:

public View getView(int position, View convertView, ViewGroup parent) {
    View vi = convertView;
    ViewHolder holder = null;

    if(vi == null){
        vi = inflater.inflate(R.layout.list_row, null);
        holder = new ViewHolder();
        holder.tvName = (TextView)vi.findViewvById(R.id.name);
        holder.tvDescription = (TextView)vi.findViewvById(R.id.desc);
        holder.btAdd = (Button)vi.findViewvById(R.id.btnadd);
    }else{
        holder = (ViewHolder) vi.getTag();
    }

    holder.btnAdd.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            holder.btnAdd.startAnimation(scale);
        holder.tvName.setVisibility(View.GONE);
        }
    });
    return vi;
}

但是Eclipse从得到错误holder.btnAdd.startAnimation（规模）;并表示持证人应是最终的......

But eclipse get error from "holder.btnAdd.startAnimation(scale);" and says holder should be final......

我怎样才能解决这个问题？

How can I fix it?

推荐答案

您应该获得的视图与的onClick 方法如下：

holder.btnAdd.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        v.startAnimation(scale);
    }
});  

您传递视图V 参数在的onClick 方法。然后，你的方法连接到View这是你的情况： holder.btnAdd ，所以 v == holder.btnAdd

You pass the View v parameter in your onClick method. Then, your method is attached to the View which is in your case: holder.btnAdd, therefore v == holder.btnAdd

更新结果
这是一个有点笨我做了什么来解决这个问题。这是很容易的，你的确初始化 viewHolder 为空，但你不应该。这就是为什么你不能让你的 viewHolder 为最后：

Update
It's a bit stupid what I did to resolve this. This is really easy, indeed you initialize viewHolder as null but you shouldn't. That's why you can't make your viewHolder as final:

public View getView(int position, View convertView, ViewGroup parent) {
    View vi = convertView;
    final ViewHolder holder; // without initialized

    if(vi == null){
        vi = inflater.inflate(R.layout.list_row, null);
        holder = new ViewHolder();
        holder.tvName = (TextView)vi.findViewvById(R.id.name);
        holder.tvDescription = (TextView)vi.findViewvById(R.id.desc);
        holder.btAdd = (Button)vi.findViewvById(R.id.btnadd);
    }else{
        holder = (ViewHolder) vi.getTag();
    }
    holder.btnAdd.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            v.startAnimation(scale);
            holder.tvName.setVisibility(View.GONE);
        }
    });
    return vi;
}

这就是它！

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