ListView显示多种item

最新推荐文章于 2024-10-19 14:10:23 发布

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最新推荐文章于 2024-10-19 14:10:23 发布

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分类专栏： android 文章标签： android

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本文介绍了如何在Android中使用ListView来显示不同类型的item。通过适配器的重写方法，实现了多类型数据的展示，并提供了详细的代码示例及实际效果展示。

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ListView显示多种item

适配器中重写以下两个方法

//item的状态数量
    @Override
    public int getViewTypeCount() {
        return 2;
    }
//判断是哪一种状态
    @Override
    public int getItemViewType(int position) {
        if (position % 2 == 0) {
            return TYPE_NEWS_1;
        } else {
            return TYPE_NEWS_2;
        }
    }

详细代码如下

public class MyAdapter extends BaseAdapter {

    private List<News> data;
    private Context mContext;
    //定义两种状态
    private static final int TYPE_NEWS_1 = 0;
    private static final int TYPE_NEWS_2 = 1;

    public MyAdapter() {
    }

    public MyAdapter(List<News> data, Context mContext) {
        this.data = data;
        this.mContext = mContext;
    }

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

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

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

    //item的状态数量
    @Override
    public int getViewTypeCount() {
        return 2;
    }

    //判断是哪一种状态（此处只写了两个状态的，开发中根据不同item数量，根据不同参数判断选择哪个type）
    @Override
    public int getItemViewType(int position) {
        if (position % 2 == 0) {
            return TYPE_NEWS_1;
        } else {
            return TYPE_NEWS_2;
        }
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        //获取当前itam的状态
        int type = getItemViewType(position);

        ViewHolder holder = null;
        ViewHolder2 holder2 = null;
        if (convertView == null) {
            //根据状态 type判断，根据不同状态，绑定不同的 xml 文件.
            switch (type) {

                case TYPE_NEWS_1:

                    holder = new ViewHolder();
                    convertView = LayoutInflater.from(mContext).inflate(R.layout.listview_item_one, parent, false);
                    holder.img = convertView.findViewById(R.id.img);
                    holder.title = convertView.findViewById(R.id.title_tv);
                    holder.context = convertView.findViewById(R.id.context_tv);
                    convertView.setTag(holder);

                    break;

                case TYPE_NEWS_2:

                    holder2 = new ViewHolder2();
                    convertView = LayoutInflater.from(mContext).inflate(R.layout.listview_item_two, parent, false);
                    holder2.img = convertView.findViewById(R.id.img);
                    holder2.title = convertView.findViewById(R.id.title_tv);
                    holder2.context = convertView.findViewById(R.id.context_tv);
                    convertView.setTag(holder2);

                    break;

            }
        } else {
            switch (type) {

                case TYPE_NEWS_1:
                    holder = (ViewHolder) convertView.getTag();
                    break;

                case TYPE_NEWS_2:
                    holder2 = (ViewHolder2) convertView.getTag();
                    break;
            }
        }
        switch (type) {

            case TYPE_NEWS_1:
                holder.img.setBackgroundResource(data.get(position).getImg());
                holder.title.setText(data.get(position).getTitle());
                holder.context.setText(data.get(position).getContext());

                break;

            case TYPE_NEWS_2:

                holder2.img.setBackgroundResource(data.get(position).getImg());
                holder2.title.setText(data.get(position).getTitle());
                holder2.context.setText(data.get(position).getContext());

                break;

        }

        return convertView;
    }

    static class ViewHolder {

        ImageView img;
        TextView title;
        TextView context;

    }

    static class ViewHolder2 {
        ImageView img;
        TextView title;
        TextView context;
    }

}

效果图如下
在这里插入图片描述