如何获取嵌套对象并通过Android中的Retrofit2将它们设置为RecyclerView？

Question

我有一个带嵌套对象的JSON url。第一类是SubNodes，我可以从中获取数据。它还有一个标题为ImageList的不同对象保存图像但我无法从ImageList获取数据。我正在使用RecyclerView。 Log返回null。我该如何解决这个错误？

SubNodes.java

public class SubNodes {
public String body;
public ImageList image;


public String getBody() {
    return body;
}

public void setBody(String body) {
    this.body = body;
}
}

ImageList.java

public class ImageList {
public String src;

public String getSrc() {
    return src;
}

public void setSrc(String src) {
    this.src = src;
}
}

改造2代码

requestCatalog.enqueue(new Callback<NewsCatalog>() {
        @Override
        public void onResponse(Call<NewsCatalog> call, Response<NewsCatalog> response) {
            NewsCatalog catalog = response.body();
            SubNodes subNodes;
            mainNodes = new MainNodes();

            try {
                for (int i = 0; i < catalog.nodes.size(); i++) {
                    mainNodes = catalog.nodes.get(i);

                    subNodes = new SubNodes();

                    subNodes.setBody(mainNodes.node.body);
                    Toast.makeText(context,mainNodes.node.image.src,Toast.LENGTH_SHORT).show();
                    subNodes.image.setSrc("bxdbsnd");

                    subNodesList.add(subNodes);
                    adapter.notifyDataSetChanged();
                }

            } catch (Exception e) {
                Log.e(TAG, "" + e.getCause());
            }
        }

        @Override
        public void onFailure(Call<NewsCatalog> call, Throwable t) {
            Log.e(TAG, "Error: " + t.getMessage());
        }
    });
}

RecyclerView.Adapter

  @Override
public void onBindViewHolder(ViewHolder holder, int position) {
    SubNodes subNodes = subNodesList.get(position);

    holder.ivNews.setText(subNodes.image.getSrc());

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        holder.tvText.setText(Html.fromHtml(subNodes.getBody(), Html.FROM_HTML_MODE_LEGACY));
    } else {
        holder.tvText.setText(Html.fromHtml(subNodes.getBody()));
    }
}