Question

我有一个适配器

SearchAdapter.java：

public class SearchAdapter extends RecyclerView.Adapter<SearchAdapter.ViewHolder> {
private Context mContext;
private LayoutInflater inflater;
private final List<Category> mDataset;

public SearchAdapter(Context c, List<Category> categoryList) {
    mContext = c;
    inflater = LayoutInflater.from(c);
    mDataset= categoryList;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    return new ViewHolder(LayoutInflater.from(parent.getContext())
            .inflate(R.layout.item_search_category, parent, false));
}

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
    holder.textView_category.setText(mDataset.get(position).getName());
}

static class ViewHolder extends RecyclerView.ViewHolder {
    private Button button_sub;
    private TextView textView_category, textView_subCategory;

    public ViewHolder(View itemView) {
        super(itemView);
        ...
    }
}

Category.java：

public class Category {

private Integer id;
private String name;
private String image;
private String createdAt;
private String updatedAt;
private List<Subcategory> subcategories = new ArrayList<Subcategory>(); 

/**getter and setter**/

}

SubCategory.java（扩展category.java）：

public class Subcategory extends Category {

private String categoryId;

/**getter and setter**/
}

我可以毫无问题地创建SearchAdapter的新实例。

mAdapter = new SearchAdapter(rootView.getContext(), categoryList);

但是，我无法将SubCategory列表传递给适配器，即使它继承自Category。

mAdapter = new SearchAdapter(rootView.getContext(), subCategoryList);

更新：以下是我收到的错误消息：

预期参数：类别 - 实际论点：SUBCATEGORY

非常感谢任何帮助

Answer 1

试试这个：

Answer 2

由于Ashis Tiwari的建议，我找到了解决方案。

由于它是一个List，我必须按如下方式输入不同的内容：

List<Category> subCategoryList = (List<Category>)(List<?>) item.getSubcategories();

与子类共享recylerview adpter

2 个答案: