Question

我正在我的应用程序中实现分页概念我从数据库中获取数据15当我有超过15个数据它工作正常时，进度条工作正常

问题是：当只有4或5条记录时，进度条会继续进行，这不应该像只有当我滚动才能获得更多数据时才会出现进度条

我该如何解决？

    final RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(mContext);
            recyclerView.setLayoutManager(mLayoutManager);
            recyclerView.setItemAnimator(null);
            parishNewsAdapter = new ParishNewsAdapter(recyclerView, listParishNews, mActivity, mContext);
            recyclerView.setAdapter(parishNewsAdapter);

            parishNewsAdapter.setOnLoadMoreListener(new OnLoadMoreListener() {
                @Override
                public void onLoadMore() {
                    finalList.add(null);
                    parishNewsAdapter.notifyItemInserted(finalList.size() - 1);

                    new Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            ArrayList<ParishNewsModel> mList = new ArrayList<>();
                            finalList.remove(finalList.size() - 1);
                            parishNewsAdapter.notifyItemRemoved(finalList.size());
                            index = index + 15;
                            int end = index + 1;
                            mList = tableHelper.getParishNews(end);
                            if (mList.size() == 0) {
                                ParishNewsAdapter.LoadingViewHolder.progressBar.setVisibility(View.GONE);
                            }
                            parishNewsAdapter.addObjectToList(mList);
                            parishNewsAdapter.notifyDataSetChanged();
                            parishNewsAdapter.setLoaded();
                        }
                    }, 1000);
                }
            });

This is where i just call the adapter where the progress should show when i swipe to see more data

here is my adapter 

private ArrayList<ParishNewsModel> parishList;
    ParishNewsModel parishNewsModel;
    Context mContext;
    private final int VIEW_TYPE_ITEM = 0;
    private final int VIEW_TYPE_LOADING = 1;
    private OnLoadMoreListener onLoadMoreListener;

    private boolean isLoading;
    private Activity activity;
    private int visibleThreshold = 5;
    private int lastVisibleItem, totalItemCount;
    int limit = 10;

    public ParishNewsAdapter(RecyclerView recyclerView, ArrayList<ParishNewsModel> parishList, Activity activity, Context mContext) {
        this.activity = activity;
        this.parishList = parishList;
        this.mContext = mContext;

        final LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                totalItemCount = linearLayoutManager.getItemCount();
                lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
                if (!isLoading && totalItemCount <= (lastVisibleItem + visibleThreshold)) {
                    if (onLoadMoreListener != null) {
                        onLoadMoreListener.onLoadMore();
                    }
                    isLoading = true;
                }
            }
        });
    }

    public void setOnLoadMoreListener(OnLoadMoreListener mOnLoadMoreListener) {
        this.onLoadMoreListener = mOnLoadMoreListener;
    }

    @Override
    public int getItemViewType(int position) {
//        return parishList.get(position) == null ? VIEW_TYPE_LOADING : VIEW_TYPE_ITEM;
        if (parishList.get(position) == null) {
            return VIEW_TYPE_LOADING;
        } else {
            return VIEW_TYPE_ITEM;
        }
    }


    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == VIEW_TYPE_ITEM) {
            View view = LayoutInflater.from(activity).inflate(R.layout.parish_news_reference_layout, parent, false);
            return new MyViewHolder(view);
        } else if (viewType == VIEW_TYPE_LOADING) {
            View view = LayoutInflater.from(activity).inflate(R.layout.lazy_load_progress_bar, parent, false);
            return new LoadingViewHolder(view);
        }
        return null;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
        if (holder instanceof MyViewHolder) {
            ParishNewsModel newsModel = parishList.get(position);
            MyViewHolder myViewHolder = (MyViewHolder) holder;
            myViewHolder.title.setText(newsModel.getTitleOfTheNews());
            myViewHolder.short_description.setText(Html.fromHtml(newsModel.getDescription()));
            myViewHolder.date_of_text.setText(Html.fromHtml(newsModel.getDateOfNews()));
            String str = newsModel.getParishNewsImage();
            Glide.with(mContext).load(str).thumbnail(Glide.with(mContext).load(R.drawable.jesus)).into(myViewHolder.circleImageView);
        } else if (holder instanceof LoadingViewHolder) {
            LoadingViewHolder loadingViewHolder = (LoadingViewHolder) holder;
            loadingViewHolder.progressBar.setVisibility(View.VISIBLE);
            loadingViewHolder.progressBar.setIndeterminate(true);
        }
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                parishNewsModel = parishList.get(position);
                AppUtils.model = parishNewsModel;
                if (AppUtils.model != null) {
                    Intent intent = new Intent(mContext, ScrollingActivity.class);
                    mContext.startActivity(intent);
                }
            }
        });
    }

    static class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView title, short_description, date_of_text;
        ImageView circleImageView;

        public MyViewHolder(View itemView) {
            super(itemView);
            title = (TextView) itemView.findViewById(R.id.title_parish_news);
            short_description = (TextView) itemView.findViewById(R.id.short_description);
            date_of_text = (TextView) itemView.findViewById(R.id.date_published);
            circleImageView = (ImageView) itemView.findViewById(R.id.news_image);
        }
    }

    public static class LoadingViewHolder extends RecyclerView.ViewHolder {
        public static ProgressBar progressBar;

        public LoadingViewHolder(View itemView) {
            super(itemView);
            progressBar = (ProgressBar) itemView.findViewById(R.id.progressBar1);
        }
    }

    @Override
    public int getItemCount() {
        return parishList == null ? 0 : parishList.size();

    }

    public void addObjectToList(ArrayList<ParishNewsModel> list) {
        parishList.addAll(list);
    }

    public void setLoaded() {
        isLoading = false;
    }

我如何进一步行动请指导我

Answer 1

只需从onBindViewHolder上的适配器中删除进度条并放入其中 postDelayed。这是因为当你向下滚动onBindViewHolder时会再次调用并再次设置进度条仅在其中可见。

进度条没有隐藏在它应该被隐藏的地方，它会继续显示

1 个答案: