MaterialTextView 不能被投射到微调器中

如何解决MaterialTextView 不能被投射到微调器中

我正在尝试创建一个利用来自微调器和文本视图的数据的适配器。

        @Override
        public RecipeViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup,int i) {
               View mView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_list,viewGroup,false);

                return new RecipeViewHolder(mView);
        }

        @Override
        public void onBindViewHolder(@NonNull RecipeViewHolder recipeViewHolder,int i) {

                recipeViewHolder.imageView.setImageResource(myrecipeList.get(i).getImage());
                recipeViewHolder.mTitle.setText(myrecipeList.get(i).getName());
                recipeViewHolder.mMeal.setSelection(getIndex(recipeViewHolder.mMeal,myrecipeList.get(i).getMeal()));
                recipeViewHolder.mDifficulty.setSelection(getIndex2(recipeViewHolder.mDifficulty,myrecipeList.get(i).getDifficulty()));
        }

        @Override
        public int getItemCount() {
                return myrecipeList.size();
        }
}
class RecipeViewHolder extends RecyclerView.ViewHolder {

        ImageView imageView;
        TextView mTitle
        Spinner mMeal,mDifficulty;
        CardView mCardView;

        public RecipeViewHolder(View itemView) {
                super(itemView);
                imageView = itemView.findViewById(R.id.idIVCourseImage);
                mTitle = itemView.findViewById(R.id.idTVCourseName);
                mMeal = itemView.findViewById(R.id.idTVCourseMeal);
                mDifficulty = itemView.findViewById(R.id.idTVCourseDifficulty);
        }
 

GetIndex 应该将其转换为字符串：

  public int getIndex(Spinner spinner,String meal) {
                for (int i = 0; i < spinner.getCount(); i++) {
                        if (spinner.getItemAtPosition(i).toString().equalsIgnoreCase(meal)) {
                                return i;
                        }
                }
                return 0;

获取索引 2 是一样的，但难度不同

这里的膳食和难度是用户从微调列表中选择的两个值。 下面给出的是我的 logcat：

2021-04-15 23:01:31.410 25171-25171/com.example.myrecipiebook E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.myrecipiebook,PID: 25171
    java.lang.ClassCastException: com.google.android.material.textview.MaterialTextView cannot be cast to android.widget.Spinner
        at com.example.myrecipiebook.RecipeViewHolder.<init>(RecipeAdapter.java:86)
        at com.example.myrecipiebook.RecipeAdapter.onCreateViewHolder(RecipeAdapter.java:54)
        at com.example.myrecipiebook.RecipeAdapter.onCreateViewHolder(RecipeAdapter.java:23)