android - 在 RecycleView 中加载图像

Question

从 recyclerview 中的 json 收集图像。当我们到达最后时如何加载下一页？我只是在学习使用retrofit2、rxjava2。我请您不要严格判断并建议我做错了什么。我将监听器挂在适配器内的 onBind 中：

@Override public void onBindViewHolder(@NonNull ImageViewHolder holder, final int position) {
Hit hit = hits.get(position);
Picasso.get().load(hit.getLargeImageURL())
        .into(holder.imageViewPreview);
if (loadMoreListener != null && !isLoading && !noMore && position == getItemCount() - 1) {
    isLoading = true;
    loadMoreListener.loadMore();
}

我正在尝试通过将其编号传递给参数来实现加载下一页的激活：

adapter.setLoadMoreListener(new ImageAdapter.LoadMoreListener() {
        @Override
        public void loadMore() {
            Toast.makeText(MainActivity.this, "Конец", Toast.LENGTH_SHORT).show();
            page++;
            viewModel.loadImages(searchQuery, page);

            adapter.endLoading();
            adapter.setNoMore(true);
            adapter.notifyDataSetChanged();
        }
    });

发生启动错误 - RecyclerView 正在计算布局或滚动时无法调用此方法 androidx.recyclerview.widget.RecyclerView

LoadImages() 方法代码：

 public void loadImages(String query, int page){
NetworkService networkService  =  NetworkService.getInstance();
compositeDisposable = new CompositeDisposable();
Disposable disposable = networkService.getJSONApi()
        .getResponse(query, page)
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(new Consumer<Response>() {
            @Override
            public void accept(Response response) throws Exception {
                deleteHits();
                insertHits(response.getHits());
            }
        }, new Consumer<Throwable>() {
            @Override
            public void accept(Throwable throwable) throws Exception {
                Toast.makeText(getApplication(), throwable.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });

compositeDisposable.add(disposable);

}

标签： androidandroid-recyclerviewretrofit2rx-java2

Answer 1

尝试使用以下代码通知适配器：

recyclerview.post(new Runnable() {
     @Override
     public void run() {
         myadapter.notifyDataSetChanged();
     }
});

还要检查：https ://www.journaldev.com/24041/android-recyclerview-load-more-endless-scrolling