RecyclerView onCreateViewHolder返回类型与多个自定义ViewHolders不兼容

我正在尝试在RecyclerView中使用多个ViewHolders，以便在运行时交换这些视图 . 我创建了两个扩展RecyclerView.ViewHolder的类：

MenuItemViewHolder

public class MenuItemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

public TextView menuItemText;
public ImageView menuItemPhoto;
public RecyclerViewAdapter rva;

public MenuItemViewHolder(View itemView) {
    super(itemView);
    itemView.setOnClickListener(this);

    rva = caller;
    menuItemText = (TextView) itemView.findViewById(R.id.grid_text);
    menuItemPhoto = (ImageView) itemView.findViewById(R.id.grid_image);
}

@Override
public void onClick(View view) {
    Toast.makeText(view.getContext(), "Clicked Position = " + getPosition(), Toast.LENGTH_SHORT).show();

}

}

SelectedItemViewHolder

public class SelectedItemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

public TextView menuItemText;
public ImageView menuItemPhoto;
public RecyclerViewAdapter rva;

public SelectedItemViewHolder(View itemView) {
    super(itemView);
    itemView.setOnClickListener(this);

    menuItemText = (TextView) itemView.findViewById(R.id.grid_text_full);
    menuItemPhoto = (ImageView) itemView.findViewById(R.id.grid_image_full);
}

@Override
public void onClick(View view) {
    Toast.makeText(view.getContext(), "Clicked Position = " + getPosition(), Toast.LENGTH_SHORT).show();
}

}

它们在我的RecyclerViewAdapter类的onCreateViewHolder函数中调用：

RecyclerViewAdapter onCreateViewHolder

// Create new views (invoked by the layout manager)
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType) {
            case 0:
                View gridItemLayout = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.grid_single, parent, false);
                // set the view's size, margins, paddings and layout parameters
                MenuItemViewHolder vh = new MenuItemViewHolder(gridItemLayout);
            case 2:
                View selectedItemLayout = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.grid_single_full, parent, false);
                // set the view's size, margins, paddings and layout parameters
                SelectedItemViewHolder sivh = new SelectedItemViewHolder(selectedItemLayout);
                return sivh;
        }
    }

当我尝试运行代码时，我收到此错误：

错误：（48,36）错误：RecyclerViewAdapter中的onCreateViewHolder（ViewGroup，int）无法覆盖适配器返回类型中的onCreateViewHolder（ViewGroup，int）ViewHolder与其中VH是类型变量的MenuItemViewHolder不兼容：VH扩展了在类中声明的ViewHolder适配器

所以，问题似乎是onCreateViewHolder不接受我的自定义类继承自RecyclerView.ViewHolder . 我正在使用Android Studio，所以问题就在那里 . 我很困惑，因为我认为Java继承可以毫无问题地处理这个问题 . 有人可以提出解决方案吗？

编辑：当我将onCreateViewHolder的返回类型更改为只有一个VH的MenuItemViewHolder时，一切正常 . 但是，当我有多个可以随时交换的VH类时，这不起作用 .