在 onCreateViewHolder 中使用不同的视图

Question

我按照 Google 开发者 YouTube 频道的 this 教程来实施 AdMob 原生快速广告。

我收到以下错误：

required: packagename.adapter.viewHolder
found   : packagename.adapter.NativeExpressAdViewHolder

这是我的 onCreateViewHolder 的样子：

public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    switch (viewType) {
        case AD_VIEW_TYPE:
            View nativeExpressLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.native_express_add_container, parent, false);
            return new NativeExpressAdViewHolder(nativeExpressLayoutView); 
        case MENU_ITEM_VIEW_TYPE:
            default:
            View myLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list, parent, false);
            return new ViewHolder(myLayoutView);
    }
}

这是我的 2 个不同的 ViewHolder 类:

class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {      

    ViewHolder(View itemView) {
        super(itemView);
    }          
}

public class NativeExpressAdViewHolder extends RecyclerView.ViewHolder {
    NativeExpressAdViewHolder(View view) {
        super(view);
    }
}

这是没有答案的模拟问题：

Error "Incompatible types" while adding NativeAds in recyclerView
How to add NativeExpressAdView with Custom Model List Android?

编辑：

这是我要求的完整适配器：

public class MainActivityVideoAdapter extends Adapter<MainActivityVideoAdapter.ViewHolder> {
ArrayList<Bitmap> bitmapArrayList;
Context context;
LayoutInflater layoutInflater;
View myLayoutView;
ArrayList<PathModel> ThumbPathList;
ArrayList<PathModel> VideoPathList = new ArrayList();
static DBManager manager;
long _id;

private static final int MENU_ITEM_VIEW_TYPE = 0;
private static final int AD_VIEW_TYPE = 1;

class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    //Video Title
    TextView videoName;
    //Video Image
    CircularImageView videoThumb;
    //PopupMenu
    ImageButton viewholderOtions;

    ViewHolder(View itemView) {
        super(itemView);
        viewholderOtions = (ImageButton) myLayoutView.findViewById(R.id.viewholderOptions);
        videoName = (TextView) myLayoutView.findViewById(R.id.FilePath);
        videoThumb = (CircularImageView) myLayoutView.findViewById(R.id.VideoThumbnail);
        //View onClick
        itemView.setOnClickListener(this);
        //Popup onClick
        viewholderOtions.setOnClickListener(this);
    }


    //Handling click events
    @Override
    public void onClick(View v) {
        if (v == viewholderOtions) {

            int position = (int) v.getTag();

            showPopupMenu(viewholderOtions, position);
        }

    }
}

public class NativeExpressAdViewHolder extends RecyclerView.ViewHolder {
    NativeExpressAdViewHolder(View view) {
        super(view);
    }
}

public MainActivityVideoAdapter(Context context, ArrayList<PathModel> ThumbPathList, ArrayList<PathModel> VideoPathList) {
    this.context = context;
    this.ThumbPathList = ThumbPathList;
    this.VideoPathList = VideoPathList;
}

public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    switch (viewType) {
        case AD_VIEW_TYPE:
            View nativeExpressLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.native_express_add_container, parent, false);
            return new NativeExpressAdViewHolder(nativeExpressLayoutView);
        case MENU_ITEM_VIEW_TYPE:
        default:
            View myLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list, parent, false);
            return new ViewHolder(myLayoutView);
    }
}

public void onBindViewHolder(final ViewHolder myHolder, final int position) {
    int viewType = getItemViewType(position);
    switch (viewType) {
        case AD_VIEW_TYPE:

        case MENU_ITEM_VIEW_TYPE:
        default:

            final PathModel videoPathModel = this.VideoPathList.get(position);
            PathModel thumbathModel = this.ThumbPathList.get(position);
            File file = new File(videoPathModel.getPath());
            String filename = file.getName();
            myHolder.videoName.setText(filename);
            myHolder.videoThumb.setImageURI(Uri.parse(thumbathModel.getPath()));
            myHolder.viewholderOtions.setTag(position);

            myHolder.itemView.setOnClickListener(new View.OnClickListener() {


                @Override
                public void onClick(View v) {                
                Intent intent= new Intent(context, VideoPlayerActivity.class);              
                intent.putExtra("fromFA2", "fromFA2");
                context.startActivity(intent);



                }


            });

    }


}

Answer 1

我怀疑调用 class ViewHolder 把你搞砸了。称它为 MenuViewHolder 或其他名称，因为现在在这样的方法中简单地编写 ViewHolder 时：

public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

它假定您正在考虑自己的 class ViewHolder，而不是 RecyclerView.ViewHolder，然后类型不兼容。您可以通过将 class 名称更改为其他名称 或将方法声明更改为 来修复它：

public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

Although the latter would solve it as well, I'd opt for name changing, cause it's not a good practice to have classes with same names as native ones (e.g. View, ViewHolder, BaseAdapter etc.) cause it might produce confusion as it did here.

Answer 2

使用 RecyclerView 的 ViewHolder，而不是您的 ViewHolder。

public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    switch (viewType) {
        case AD_VIEW_TYPE:
            View nativeExpressLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.native_express_add_container, parent, false);
            return new NativeExpressAdViewHolder(nativeExpressLayoutView); 
        case MENU_ITEM_VIEW_TYPE:
            default:
            View myLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list, parent, false);
            return new ViewHolder(myLayoutView);
    }
}

Answer 3

你好@ClassA 我发现你一直在导入本地 class 而不是 RecyclerView.ViewHolder onBindViewHolder()

请看下面的代码，这可能对你有帮助。

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

/*
------------------
your constructor goes here
-----------------
*/

 @Override
    public int getItemCount() {
        return 0;
    }

    public void onBindViewHolder(final RecyclerView.ViewHolder myHolder, final int position) {
        int viewType = getItemViewType(position);
        switch (viewType) {
            case AD_VIEW_TYPE:
            break;

            case MENU_ITEM_VIEW_TYPE:
            break;
        }
    }

   public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType) {
            case AD_VIEW_TYPE:
                View nativeExpressLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.native_express_add_container, parent, false);
                return new NativeExpressAdViewHolder(nativeExpressLayoutView);
            case MENU_ITEM_VIEW_TYPE:
                View myLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list, parent, false);
                return new ViewHolder(myLayoutView);
        }
    }

   class ViewHolder extends RecyclerView.ViewHolder  {

        ViewHolder(View itemView) {
            super(itemView);
        }
    }

    public class NativeExpressAdViewHolder extends RecyclerView.ViewHolder {
        NativeExpressAdViewHolder(View view) {
            super(view);
        }
    }
}

此代码不包含您的变量和逻辑，此代码用于完美导入和使用方法。

如果这解决了您的问题，请批准此答案。快乐编码。

在 onCreateViewHolder 中使用不同的视图

Using different views in onCreateViewHolder

java

android

admob

android-viewholder

android-recyclerview