java - 从适配器类扩展类

Question

在我的应用程序中应该有很多彼此相似的适配器，我想知道是否可以使接口(interface)或父类(super class)从那里继承，然后而不是编写 10 个适配器，谢谢!!

我的适配器代码

public class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.NewsViewHolder> {

    private List<News> newsList;
    private Context ctx;

    public NewsAdapter(List<News> newsList, Context ctx) {
        this.newsList = newsList;
        this.ctx = ctx;
    }

    static class NewsViewHolder extends RecyclerView.ViewHolder {
        CardView cv;
        TextView newsTitle;
        TextView newsDescription;
        ImageView newsImage;
        TextView newsDate;

        NewsViewHolder(View itemView) {
            super(itemView);
            cv = (CardView) itemView.findViewById(R.id.cvNews);
            newsTitle = (TextView) itemView.findViewById(R.id.title_news);
            newsDescription = (TextView) itemView.findViewById(R.id.description_news);
            newsDate = (TextView) itemView.findViewById(R.id.date_news);
            newsImage = (ImageView) itemView.findViewById(R.id.image_news);
        }
    }

    @Override
    public NewsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.news_item, parent,
                false);
        return new NewsViewHolder(v);
    }

    @Override
    public void onBindViewHolder(NewsViewHolder holder, int position) {
        holder.newsTitle.setText(newsList.get(position).newsTitle);
        holder.newsDescription.setText(newsList.get(position).newsDescription);
        holder.newsDate.setText(newsList.get(position).newsDate);
        Glide.with(ctx).load(Constants.SITE + newsList.get(position).newsImage)
                .into(holder.newsImage);
    }

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

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
    }

}

All should reflect like this

Answer 1

it is possible to make the interface or superclass to inherit from there and then, instead of writing 10 adapters

这是可能的，但当然必须有一些共同点。首先，数据集应该是同构的。例如。您的项目都应该实现一个接口(interface)，即项目和适配器本身之间的契约。就您而言，可能是

public interface DataItem {
     String getTitle();
     String getDescription();
     String getDate();
     String getImageUrl();
}

而不是 private List<News> newsList; ，您将拥有私有(private) List<? extends DataItem> newsList; 。正如我所说，您的所有项目都必须实现该接口(interface)，并且必须通过 getter 访问属性