RecyclerView多条目

原创于 2019-03-16 17:00:17 发布 · 191 阅读

CC 4.0 BY-SA版权

本文详细介绍了一种在Android应用中使用RecyclerView实现多种布局类型的自定义适配器的方法。通过子类化ViewHolder并根据不同类型加载对应的布局，实现了数据的灵活展示。文章深入解析了getItemViewType()和onCreateViewHolder()等关键方法的运用。

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public class MoreItemAdapter extends RecyclerView.Adapter {
    private Context context;
    private List<MoreItemBean.ItemsBean> data = new ArrayList<>();

    public MoreItemAdapter(Context context) {
        this.context = context;
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        //getItemViewType()
        View view;
        RecyclerView.ViewHolder viewHolder = null;
        switch (i) {
            case 0:
                view = View.inflate(context, R.layout.more_item_0, null);
                viewHolder = new MoreItemViewHolder0(view);
                break;
            case 1:
                view = View.inflate(context, R.layout.more_item_1, null);
                viewHolder = new MoreItemViewHolder1(view);
                break;
            case 2:
                view = View.inflate(context, R.layout.more_item_2, null);
                viewHolder = new MoreItemViewHolder2(view);
                break;
        }
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
        MoreItemBean.ItemsBean bean = data.get(i);
        if (viewHolder instanceof MoreItemViewHolder0) {
            ((MoreItemViewHolder0) viewHolder).mTitle.setText(bean.getTitle());
            ((MoreItemViewHolder0) viewHolder).mDesc.setText(bean.getDesc());
             Picasso.with(context).load(bean.getImage()).into(((MoreItemViewHolder0) viewHolder).mIamge);
        } else if (viewHolder instanceof MoreItemViewHolder1) {
            List<MoreItemBean.ItemsBean.ImagesBean> imagesBean = bean.getImages();
             Picasso.with(context).load(imagesBean.get(0).getPic()).into(((MoreItemViewHolder1) viewHolder).mIamge1);
             Picasso.with(context).load(imagesBean.get(1).getPic()).into(((MoreItemViewHolder1) viewHolder).mIamge2);
             Picasso.with(context).load(imagesBean.get(2).getPic()).into(((MoreItemViewHolder1) viewHolder).mIamge3);
        } else if (viewHolder instanceof MoreItemViewHolder2) {
            ((MoreItemViewHolder2) viewHolder).mTitle.setText(bean.getTitle());
        }
    }

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


    @Override
    public int getItemViewType(int position) {
        super.getItemViewType(position);
        int type = data.get(position).getType();//返回 0  1  2
        return type;
    }



    //传递数据
    public void setData(List<MoreItemBean.ItemsBean> data) {
        this.data = data;
        notifyDataSetChanged();
    }

    private class MoreItemViewHolder0 extends RecyclerView.ViewHolder {

        TextView mTitle, mDesc;
        ImageView mIamge;

        public MoreItemViewHolder0(@NonNull View itemView) {
            super(itemView);
            mIamge = (ImageView) itemView.findViewById(R.id.image);
            mTitle = (TextView) itemView.findViewById(R.id.tv_title);
            mDesc = (TextView) itemView.findViewById(R.id.tv_desc);
        }
    }

    private class MoreItemViewHolder1 extends RecyclerView.ViewHolder {

        ImageView mIamge1, mIamge2, mIamge3;

        public MoreItemViewHolder1(@NonNull View itemView) {
            super(itemView);
            mIamge1 = (ImageView) itemView.findViewById(R.id.image1);
            mIamge2 = (ImageView) itemView.findViewById(R.id.image2);
            mIamge3 = (ImageView) itemView.findViewById(R.id.image3);
        }
    }

    private class MoreItemViewHolder2 extends RecyclerView.ViewHolder {

        TextView mTitle;

        public MoreItemViewHolder2(@NonNull View itemView) {
            super(itemView);
            mTitle = (TextView) itemView.findViewById(R.id.tv_title);
        }
    }
}