如何让recyleView,加载的后台数据,在前台图片滚动不卡顿.踩坑,作业.解决,滚动加载慢的问题

多的不说.看看下面的代码,
用 retrofit2 搭建的.

 private void load_rvswiper() {
        townArticleList=new ArrayList<>();
       //读取数据接口 分类数据
        ApiInterface apiInterface2 = ApiClient.getApiClient()//返回一个 工具 Retrofit
                .create(ApiInterface.class);  //将retrofit  与 "接口 "  retrofit.create()
        Call<townNews> call2; //用工具做  retrofit call
        call2 = apiInterface2.getTownNews_swiper("scroll");
        //下面处理 News call
        call2.enqueue(new Callback<townNews>() {//download 获取网上的资源  retrofit 工具
            //回调的信息
            @Override
            public void onResponse(Call<townNews> call, Response<townNews> response) {
                //发过来是 New
                if (response.isSuccessful() && response.body().getArticles() != null) {
                    //获取来的  Articles
                    townArticleList=response.body().getArticles();
                    rvswiper=findViewById(R.id.Servernews_swiper_rv);
                    rvswiperAdapter=new homervswiperItemAdapter(townArticleList,home_page.this);
                    swiperlinearLayoutManager=
                 //  new LinearLayoutManager(home_page.this);
                            new AutoScrollLayoutManager(home_page.this);
                    swiperlinearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
                    rvswiper.setLayoutManager(swiperlinearLayoutManager );
                    rvswiper.setAdapter(rvswiperAdapter);

                    //触发自动滚动
                    rvswiper.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                        @Override
                        public void onGlobalLayout() {
                            rvswiper.smoothScrollToPosition(rvswiperAdapter.getItemCount());
                        }
                    });
                    //连续滚动
                    rvswiper.setOnScrollListener
                            (new RecyclerView.OnScrollListener() {
                                 @Override
                                 public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
                                     super.onScrollStateChanged(recyclerView, newState);
                                     if (newState == RecyclerView.SCROLL_STATE_IDLE) {
                                         // 如果自动滑动到最后一个位置，则此处状态为SCROLL_STATE_IDLE
                                         AutoScrollLayoutManager lm = (AutoScrollLayoutManager) recyclerView.getLayoutManager();
                                         int position = lm.findLastCompletelyVisibleItemPosition();
                                         int count = lm.getItemCount();
                                         if (position == count - 1) {
                                             lm.scrollToPosition(0);
                                             rvswiper.smoothScrollToPosition(rvswiperAdapter.getItemCount());
                                         }
                                     }
                                 }
                             }
                            );
                    initListener_swipter();
                }
            }
            @Override
            public void onFailure(Call<townNews> call, Throwable t) {
                Toast.makeText(home_page.this, "没得到需要新闻结果返回!", Toast.LENGTH_LONG).show();
            }
        });
        //数据读取
    }

多的不说.只说说.RV 的滚动原理.

  rvswiper.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                        @Override
                        public void onGlobalLayout() {
                            rvswiper.smoothScrollToPosition(rvswiperAdapter.getItemCount());
                        }
                    });

如果不监测 RV 数据什么时候加载完成就调用.smoothScrollToPosition.性能会很慢.
因为retrofit2的 Call 查询,是一个线程.如果线程还没把数据给 adapter 布置完成
调用 smoothScrollToPosition 会导致.RV 卡住.

本文地址：https://blog.csdn.net/weixin_39306574/article/details/110563769