java - 如何在Android中使用Retrofit在recyclerView中设置数据

Question

我想在 recyclerview 中显示一些数据，为此我使用下面显示的代码。

当我运行应用程序时，它没有向我显示 recyclerview 中的任何数据，并且 ListData.size() 为 0，但在 <强>PostMan

我将以下代码写入recyclerView:

InterfaceApi api = ApiClient.getClient().create(InterfaceApi.class);
Call<CommentResponse> call = api.getComments(sendData);

call.enqueue(new Callback<CommentResponse>() {
    @Override
    public void onResponse(Call<CommentResponse> call, Response<CommentResponse> response) {
        if (response.body().getData() != null) {
            commentModel.clear();
            commentModel.addAll(response.body().getData());
            commentsListAdapter.notifyDataSetChanged();
            content_newsCommentsRecyclerView.setAdapter(commentsListAdapter);
        }
    }

    @Override
    public void onFailure(Call<CommentResponse> call, Throwable t) {

    }
});

我的适配器代码:

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

    private Context context;
    private List<CommentData> model;

    public CommentsListAdapter(Context context, List<CommentData> model) {
        this.context = context;
        this.model = model;
    }

    @Override
    public CommentsListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_comment, parent, false);

        return new CommentsListAdapter.ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(final CommentsListAdapter.ViewHolder holder, final int position) {

        holder.row_commentNameTxt.setText(Html.fromHtml(model.get(position).getOwner().getName()));
        holder.row_commentCommentTxt.setText(Html.fromHtml(model.get(position).getText()));
        Glide.with(context)
                .load(model.get(position).getOwner().getImageUrl())
                .placeholder(R.drawable.default_image)
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .listener(new RequestListener<String, GlideDrawable>() {
                    @Override
                    public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
                        return false;
                    }

                    @Override
                    public boolean onResourceReady(GlideDrawable resource, String model,
                                                   Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
                        return false;
                    }
                })
                .into(holder.row_commentProfileImage);
        holder.row_commentLikeTxt.setText(model.get(position).getLikeCount() + "");
        holder.row_commentReplayTxt.setText(model.get(position).getRepliesCount() + "");
        holder.row_commentDateTxt.setText(model.get(position).getSubmitDate() + " " + model.get(position).getSubmitTime());
    }

    @Override
    public int getItemCount() {
        return model.size();
    }

    public void addNewItem(List<CommentData> newContent) {
        int start = this.model.size();
        int end = newContent.size();
        model.addAll(newContent);
        notifyDataSetChanged();
    }

    public void clear() {
        model.clear();
        notifyDataSetChanged();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        private CircleImageView row_commentProfileImage;
        private TextView row_commentNameTxt, row_commentCommentTxt, row_commentLikeTxt, row_commentReplayTxt, row_commentDateTxt;

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

            row_commentProfileImage = (CircleImageView) itemView.findViewById(R.id.row_commentProfileImage);
            row_commentNameTxt = (TextView) itemView.findViewById(R.id.row_commentNameTxt);
            row_commentCommentTxt = (TextView) itemView.findViewById(R.id.row_commentCommentTxt);
            row_commentLikeTxt = (TextView) itemView.findViewById(R.id.row_commentLikeTxt);
            row_commentReplayTxt = (TextView) itemView.findViewById(R.id.row_commentReplayTxt);
            row_commentDateTxt = (TextView) itemView.findViewById(R.id.row_commentDateTxt);

        }
    }
}

如何将数据显示到 recyclerView 中？

Answer 1

在 Adapter 类中创建一个方法

       //This will add all the items in the adapter's list
       public  void addAllItems(List<CommentData> items) {
                model.addAll(items);
                notifyDataSetChanged();
            }

//In Adapter's Constructor do the following changes
 public CommentsListAdapter(Context context, List<CommentData> model) {
        this.context = context;
        this.model = new ArrayList<>;
    }

当您获取响应时，您可以通过

调用它

//Inside your onCreate add the below code 

        mAdapter = new CommentsListAdapter (this);
        content_newsCommentsRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        content_newsCommentsRecyclerView.setAdapter(mAdapter);

//Call this inside your success of onResponse
commentsListAdapter.addAllItems(commentModel);

这将更新 recyclerView 的内容并通知所做的更改，请尝试此操作，如果您有任何问题，请告诉我。