添加 admob 横幅广告时出现 RecyclerView ClassCastException

Question

尝试使用 RecyclerView 添加 Admob 横幅广告时出现 ClassCastException。我正在使用来自 blogger 的 JSON 数据，在添加横幅广告之前它运行良好。我正在使用此处的 GitHub 项目参考。错误：com.example.abcd.CategoryItem 无法在 com.example.abcd.CategoryAdapter.onBindViewHolder (CategoryAdapter.java:123) 处转换为 com.google.android.ads.AdView这是我的类别活动类别适配器：public class CategoryAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {// A menu item view type.private static final int MENU_ITEM_VIEW_TYPE = 0;// The banner ad view type.private static final int BANNER_AD_VIEW_TYPE = 1;private Context mContext;// The list of banner ads and category items.private final List<Object> mCategoryList;public CategoryAdapter(Context context, List<Object> CategoryList) {    mContext = context;    mCategoryList = CategoryList;}@Overridepublic int getItemCount() {    return mCategoryList.size();}public class CategoryViewHolder extends RecyclerView.ViewHolder {    public TextView mTextViewCategory;    public CategoryViewHolder(View itemView) {        super(itemView);        mTextViewCategory = itemView.findViewById(R.id.text_view_category);    }}public class AdViewHolder extends RecyclerView.ViewHolder {    AdViewHolder(View view) {        super(view);    }}/* Determines the view type for the given position*/@Overridepublic int getItemViewType(int position) {            if (position % CategoryActivity.ITEMS_PER_AD == 0)                return BANNER_AD_VIEW_TYPE;            else                return MENU_ITEM_VIEW_TYPE;}

Answer 1

@Override public int getItemViewType(int position) { 
    if (mCategoryList.get(position) instanceof AdView) 
        return BANNER_AD_VIEW_TYPE; 
    else return MENU_ITEM_VIEW_TYPE; 
}