如何添加适配器包括适配器recycleview android？

Question

我正在尝试使用适配器包含适配器 recyleview 错误显示来修复此错误。在此 AdapterGrid 下方包含 AdapterRecipes 添加适配器错误显示。我尝试在下面添加此错误显示添加图像如何修复错误错误显示->此片段添加适配器网格错误显示如何清除错误

 public class AdapterGrid extends RecyclerView.Adapter<AdapterGrid.ViewHolder> {

    private List<Category> items;
    private Context context;
    private OnItemClickListener mOnItemClickListener;
    SharedPref sharedPref;
    public  FragmentActivity activity;


    public AdapterGrid(FragmentActivity activity, List<Category> items) {
        this.items = items;
        this.context = context;
        this.sharedPref = new SharedPref(context);
    }




    public interface OnItemClickListener {
        void onItemClick(View view, Category obj, int position);
    }

    public void setOnItemClickListener(final OnItemClickListener mItemClickListener) {
        this.mOnItemClickListener = mItemClickListener;
    }

    // Provide a suitable constructor (depends on the kind of dataset)


    public AdapterGrid(Context context, Activity activity, ArrayList<Category> items) {
        this.items = items;
        this.context = context;
        this.sharedPref = new SharedPref(context);
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        // each data item is just a string in this case
        public TextView subcategory_text;
        public TextView recipe_count;
        public ImageView category_image;
        public RecyclerView horizontal_rv;
        public MaterialRippleLayout lyt_parent;

        public ViewHolder(View v) {
            super(v);
            subcategory_text = v.findViewById(R.id.subcategory_text);
//            recipe_count = v.findViewById(R.id.video_count);
            category_image = v.findViewById(R.id.category_image);
            lyt_parent = v.findViewById(R.id.lyt_parent);
            horizontal_rv = itemView.findViewById(R.id.horizontal_rv);
        }

    }

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

    // Replace the contents of a view (invoked by the layout manager)
    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
        final Category c = items.get(position);

        holder.subcategory_text.setText(c.category_name);


        holder.horizontal_rv.setLayoutManager(new LinearLayoutManager(activity, LinearLayoutManager.HORIZONTAL, false));
        AdapterRecipes adapter = new AdapterRecipes(context, activity, (Call<CallbackCategories>) items, R.layout.vertical_item);
        holder.horizontal_rv.setAdapter(adapter);

//        if (AppConfig.ENABLE_RECIPE_COUNT_ON_CATEGORY) {
////            holder.recipe_count.setVisibility(View.VISIBLE);
//            holder.recipe_count.setText(c.recipes_count + " " + context.getResources().getString(R.string.recipes_count_text));
//        } else {
//            holder.recipe_count.setVisibility(View.GONE);
//        }

        Picasso.get()
                .load(sharedPref.getApiUrl() + "/upload/category/" + c.category_image)
                .placeholder(R.drawable.ic_thumbnail)
                .into(holder.category_image);

        holder.lyt_parent.setOnClickListener(view -> {
            if (mOnItemClickListener != null) {
                mOnItemClickListener.onItemClick(view, c, position);
            }
        });
    }

    public void setListData(List<Category> items){
        this.items = items;
        notifyDataSetChanged();
    }

    public void resetListData() {
        this.items = new ArrayList<>();
        notifyDataSetChanged();
    }

    // Return the size of your dataset (invoked by the layout manager)
    @Override
    public int getItemCount() {
        return items.size();
    }

}

此片段添加adapterGrid错误显示如何清除错误

 private void displayCategory(List<Category> items) {
        RecyclerView recyclerView = root_view.findViewById(R.id.recycler_view_category);
        recyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
        AdapterGrid AdapterGrid = new AdapterGrid(getContext(), (Activity) getActivity(), (ArrayList<Category>) items);
        recyclerView.setAdapter(AdapterGrid);
        recyclerView.setNestedScrollingEnabled(false);
        AdapterGrid.setOnItemClickListener((view, obj, position) -> {
            Intent intent = new Intent(getActivity(), ActivityCategoryDetail.class);
            intent.putExtra(EXTRA_OBJC, obj);
            startActivity(intent);
            ((MainActivity) Objects.requireNonNull(getActivity())).showInterstitialAd();
        });

        LinearLayout lyt_category = root_view.findViewById(R.id.lyt_category);
        if (items.size() > 0) {
            lyt_category.setVisibility(View.VISIBLE);
        } else {
            lyt_category.setVisibility(View.GONE);
        }
    }

Answer 1

有

items

的铸件，具有

List<Category>

类型到

Call<CallbackCategories>

类型。看起来这是一个问题 - 请仔细检查该转换是否可行。