FeedFragmentBad.java

Parser parser = new Parser();
        parser.execute(UrlConstant.SECOND_FEED_URL);
        parser.onFinish(new OnTaskCompleted() {
            @Override
            public void onTaskCompleted(@NotNull final List<Article> list) {

                final List<Article> filtered = new ArrayList<>();

                for (int i = 0; i < list.size(); i++) {
                    Article article = list.get(i);

                    if (!TextUtils.isEmpty(article.getImage())) {
                        filtered.add(list.get(i));
                    }
                }

                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        secondFeedAdatper.setArticles(filtered);

                    }
                });

            }

            @Override
            public void onError(@NotNull Exception e) {

            }
        });

FeedFragmentGood.java

        

Handler handler = new Handler(Looper.getMainLooper());
FeedProvider feedProvider = new FeedProvider(new Parser(), handler);

        
void setupFeed(){
  feedProvider.provideFeed(new FeedProvider.OnCompleteListener() {
            @Override
            public void onComplete(List<Article> articles) {
                secondFeedAdatper.setArticles(articles);
            }
        },new FeedProvider.OnCompleteListener() {
            @Override
            public void onError(String message) {
                //todo: show error message to the user
            }
        });
}

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        handler.removeCallbacksAndMessages(null);

    }

FeedProvider.java

public class FeedProvider {

       public interface OnCompleteListener {
            void onComplete(List<Article> articles);
        }   
  public interface OnErrorListener {
            void onError(String errorMessage);
        }

        private Parser parser;
        private Handler handler;

        public FeedProvider(Parser parser, Handler handler) {
            this.parser = parser;
            this.handler = handler;
        }

        void provideFeed(final OnCompleteListener completeListener,final OnErrorListener errorListener) {
            parser.execute(UrlConstant.SECOND_FEED_URL);
            parser.onFinish(new OnTaskCompleted() {
                @Override
                public void onTaskCompleted(@NotNull final List<Article> list) {

                    final List<Article> filtered = new ArrayList<>();

                    for (int i = 0; i < list.size(); i++) {
                        Article article = list.get(i);

                        if (!TextUtils.isEmpty(article.getImage())) {
                            filtered.add(list.get(i));
                        }
                    }
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            if (completeListener != null) {
                                completeListener.onComplete(filtered);
                            }
                        }
                    });

                }

                @Override
                public void onError(@NotNull Exception e) {
                 handler.post(new Runnable() {
                        @Override
                        public void run() {
                      if(errorListener!=null){ 
                         errorListener.onError(e.getMessage()); 
                   }
                }
            });
        }

        void cancel() {
            handler.removeCallbacksAndMessages(null);
        }
    }