使用新的FB广告对象

Question

我正在尝试学习Android，并且这样做已经构建了一个新闻Feed应用程序。我使用了Android应用程序架构和分页来在recyclerview中显示feed。

以下是我的适配器

    public class NewsAdapter extends PagedListAdapter<NewsFeed, RecyclerView.ViewHolder>{
    private Context mContext;
    private static final int NEWS = 0;
    private static final int NATIVE_AD = 1;

    public NewsAdapter(Context context, boolean twoPane){
        super(DIFF_CALLBACK);
        mContext = context;
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        if(viewType == NEWS){
            CardView view = (CardView) LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.feed_list_item, parent, false);
            return new NewsViewHolder(view);
        }
        if(viewType == NATIVE_AD) {
            View view = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.item_native_ad, parent, false);

            return new NativeAdViewHolder(view);
        }
        return null;
//        View view = LayoutInflater.from(parent.getContext())
//                .inflate(R.layout.feed_list_item, parent, false);
//
//        return new NewsViewHolder(view);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        NewsFeed news = getItem(position);
        if(news.getNativeAd() == null){
            NewsViewHolder newsViewHolder = (NewsViewHolder) holder;
            if (news != null) {
                newsViewHolder.bindTo(news);
            } else {

                newsViewHolder.clear();
            }
        }else{

            NativeAdViewHolder nativeAdViewHolder = (NativeAdViewHolder) holder;
            NativeAd nativeAd = (NativeAd) getItem(position).getNativeAd();

            ImageView adImage = nativeAdViewHolder.adImage;
            TextView tvAdTitle = nativeAdViewHolder.tvAdTitle;
            TextView tvAdBody = nativeAdViewHolder.tvAdBody;
            Button btnCTA = nativeAdViewHolder.btnCTA;
            LinearLayout adChoicesContainer = nativeAdViewHolder.adChoicesContainer;
            MediaView mediaView = nativeAdViewHolder.mediaView;

            tvAdTitle.setText(nativeAd.getAdTitle());
            tvAdBody.setText(nativeAd.getAdBody());
            NativeAd.downloadAndDisplayImage(nativeAd.getAdIcon(), adImage);
            btnCTA.setText(nativeAd.getAdCallToAction());
            AdChoicesView adChoicesView = new AdChoicesView(mContext, nativeAd, true);
            adChoicesContainer.addView(adChoicesView);
            mediaView.setNativeAd(nativeAd);

            List<View> clickableViews = new ArrayList<>();
            clickableViews.add(adImage);
            clickableViews.add(btnCTA);
            clickableViews.add(mediaView);
            nativeAd.registerViewForInteraction(nativeAdViewHolder.container, clickableViews);
        }

    }

    @Override
    public int getItemViewType(int position) {
        NewsFeed item = getItem(position);
        if(item.getNativeAd() == null){
            return NEWS;
        }
        return NATIVE_AD;
//        return super.getItemViewType(position);
    }

    public static final DiffUtil.ItemCallback<NewsFeed> DIFF_CALLBACK =
            new DiffUtil.ItemCallback<NewsFeed>() {
                @Override
                public boolean areItemsTheSame(NewsFeed oldItem, NewsFeed newItem) {
                    return oldItem.getTitle() == newItem.getTitle();
                }

                @Override
                public boolean areContentsTheSame(NewsFeed oldItem, NewsFeed newItem) {
                    return oldItem.equals(newItem);
                }
            };

    public class NewsViewHolder extends RecyclerView.ViewHolder {
        private View itemView;
        private ImageView newsImage;
        private TextView title;
        private TextView description;

        public NewsViewHolder(View itemView){
            super(itemView);
            this.itemView = itemView;
            this.newsImage = (ImageView) itemView.findViewById(R.id.news_icon);
            this.title = (TextView) itemView.findViewById(R.id.tv_feed_title);
            this.description = (TextView) itemView.findViewById(R.id.tv_feed_description);
        }

        public void bindTo(final NewsFeed newsFeed){
            if(newsFeed.getUrlToImage() != null) {
                Picasso.get().load(newsFeed.getUrlToImage()).into(newsImage);
            }
            title.setText(newsFeed.getTitle());
            description.setText(newsFeed.getDescription());

            itemView.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View v) {
//                    Toast.makeText(mContext,newsFeed.getTitle(),Toast.LENGTH_LONG).show();
                    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(newsFeed.getUrl()));
                   mContext.startActivity(browserIntent);
                }
            });
        }

        public void clear(){
            newsImage.setImageURI(null);
            title.setText(null);
        }

    }

    private static class NativeAdViewHolder extends RecyclerView.ViewHolder {
        ImageView adImage;
        TextView tvAdTitle;
        TextView tvAdBody;
        Button btnCTA;
        View container;
        LinearLayout adChoicesContainer;
        MediaView mediaView;

        NativeAdViewHolder(View itemView) {
            super(itemView);
            this.container = itemView;
            adImage = (ImageView) itemView.findViewById(R.id.adImage);
            tvAdTitle = (TextView) itemView.findViewById(R.id.tvAdTitle);
            tvAdBody = (TextView) itemView.findViewById(R.id.tvAdBody);
            btnCTA = (Button) itemView.findViewById(R.id.btnCTA);
            adChoicesContainer = (LinearLayout) itemView.findViewById(R.id.adChoicesContainer);
            mediaView = (MediaView) itemView.findViewById(R.id.mediaView);
        }
    }

    public void updateList(NewsFeed newsFeed){
        PagedList<NewsFeed> pagedList = this.getCurrentList();
        submitList(pagedList);

    }
}

我正在使用ViewModel并观察结果以更新适配器。

newsViewModel = ViewModelProviders.of(this).get(NewsViewModel.class);
    newsViewModel.setmContext(this);
    newsViewModel.dataLoadStatus().observe(this, loadStatus -> {
        switch (loadStatus) {
            case LOADING:
                progressBar.setVisibility(View.VISIBLE);
                break;
            case LOADED:
                progressBar.setVisibility(View.INVISIBLE);
                break;
            case FAILED:
                progressBar.setVisibility(View.INVISIBLE);
                break;
        }
    });
    newsViewModel.getNews().observe(this, pagedList ->{
        newsAdapter.submitList(pagedList);
    });

现在，我正在使用FB原生广告，并希望更新我的recyclerview适配器的pagedList，以便显示添加块（上面的适配器添加了代码）。我无法更新此pagedList或通知适配器查看新数据。 任何人都可以指出我正确的方向。

由于