“onBindViewHolder”函數中的Android Recycler View問題“無法從非靜態方法調用靜態方法”

Question

我是 android 和 java 的新手。 我無法調用ViewHolder.setCategoryName(name); 在onBindViewHolder函數中。 我知道可能有類似的問題，但還沒有對我有用。 編譯器給出錯誤“不能從靜態上下文調用非靜態函數”，我沒有在代碼中的任何地方使用 static 關鍵字。

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

    private List<CategoryModel> categoryModelList;

    public CategoryAdapter(List<CategoryModel> categoryModelList) {
        this.categoryModelList = categoryModelList;
    }

    @NonNull
    @Override
    public CategoryAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int position) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.category_item,viewGroup,false);
        return new ViewHolder(view);
    }

    @Override
    public  void onBindViewHolder(@NonNull CategoryAdapter.ViewHolder holder, int position) {
        String icon = categoryModelList.get(position).getCategoryIconLink();
        String name = categoryModelList.get(position).getCategoryName();
        ViewHolder.setCategoryName(name);

    }


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


    public class ViewHolder extends  RecyclerView.ViewHolder{

       private ImageView categoryIcon;
       private TextView categoryName;

        public ViewHolder(@NonNull View itemView)  {
              super(itemView);
              categoryIcon = itemView.findViewById(R.id.category_icon);
              categoryName = itemView.findViewById(R.id.category_name);

        }

        private void setCategoryIcon(){

        }
        private void setCategoryName(String name){

            categoryName.setText(name);
        }
    }
}

Answer 1

問題是您的方法不是靜態的，但您試圖從靜態上下文調用：

 private void setCategoryName

您需要執行以下操作：

 private static void setCategoryName

但是，對於這種類型的操作，您可以只使用 holder 變量：

holder.bind(categoryModelList.get(position))

Answer 2

嘗試這個：

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

    private List<CategoryModel> categoryModelList;

    public CategoryAdapter(List<CategoryModel> categoryModelList) {
        this.categoryModelList = categoryModelList;
    }

    @NonNull
    @Override
    public CategoryAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int position) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.category_item,viewGroup,false);
        return new ViewHolder(view);
    }

    @Override
    public  void onBindViewHolder(@NonNull CategoryAdapter.ViewHolder holder, int position) {

    holder.bind(categoryModelList.get(position))

    }


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


    public class ViewHolder extends  RecyclerView.ViewHolder{

       private ImageView categoryIcon;
       private TextView categoryName;

        public ViewHolder(@NonNull View itemView)  {
              super(itemView);
              categoryIcon = itemView.findViewById(R.id.category_icon);
              categoryName = itemView.findViewById(R.id.category_name);

        }

       public void bind(CategoryModel categoryModel){

             categoryName.setText(categoryModel.getCategoryName());
        }
    }
}