请求访问数据展示在listview上多条目根据奇偶数

最新推荐文章于 2023-12-16 14:35:03 发布

原创最新推荐文章于 2023-12-16 14:35:03 发布 · 229 阅读

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本文介绍了一个名为 PullListAdapter 的自定义适配器类，该类继承自 BaseAdapter 并用于处理列表视图中不同类型的项，包括图片和纯文本项。通过使用 ViewHolder 模式减少视图查找操作，提高列表滚动性能。适配器支持两种视图类型：带有图片的项和纯文本项，并详细展示了如何根据不同类型的项加载相应的布局。

public class PullListAdapter extends BaseAdapter{
    int IMAGE = 0;
    int TEXT = 1;
    List<DBean.ResultsBean> list;
    Context context;
    public PullListAdapter(List<DBean.ResultsBean> list, Context context) {
        this.list = list;
        this.context = context;
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public int getItemViewType(int position) {
        if (list.get(position).getImages()!=null){
            return IMAGE;
        }
        return TEXT;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (getItemViewType(position)==IMAGE){
            //如果返回IMAGE
            ImageHolder holder;
            if (convertView==null){
                convertView = View.inflate(context, R.layout.pull_item2,null);

                holder = new ImageHolder();
                holder.imageView = (ImageView) convertView.findViewById(R.id.pull_image);
                holder.textView = (TextView) convertView.findViewById(R.id.pull_text);

                convertView.setTag(holder);
            }else{
                holder = (ImageHolder) convertView.getTag();
               }
            holder.textView.setText(list.get(position).getDesc());
            ImageLoader.getInstance().displayImage(list.get(position).getImages().get(0),holder.imageView, ImageLoaderUtil.getDefautOption());
        }else if (getItemViewType(position)==TEXT){
            //如果返回TEXT
            TextHolder holder;
            if (convertView==null){
                convertView = View.inflate(context, R.layout.pull_item1,null);

                holder = new TextHolder();

                holder.textView = (TextView) convertView.findViewById(R.id.pull_text);

                convertView.setTag(holder);
            }else{
                holder = (TextHolder) convertView.getTag();
            }
            holder.textView.setText(list.get(position).getDesc());

        }
        return convertView;
    }
    class ImageHolder{
        ImageView imageView;
        TextView textView;
    }
    class TextHolder{
        TextView textView;
    }
}