RecyclerView OnBindViewWholder仅在选项卡布局中调用一次

Question

我有四个选项卡和四个片断（每个片断代表每个选项卡）。

每个片段都有一个垂直的回收器视图。由于所有片段视图看起来都很相似，我重新使用了相同的布局文件、相同的回收器视图项和相同的适配器。

问题是在第一个选项卡和第三个选项卡和第四个选项卡下只加载了一个项，而第二个选项卡成功地加载了整个数据。

我希望下面添加的图片能更好地理解这个问题。

这是我的适配器代码

public class OthersAdapter extends RecyclerView.Adapter<OthersAdapter.OthersViewHolder> {

    private final Context context;
    private final ArrayList<LocalDealsDataFields> othersDataArray;
    private LayoutInflater layoutInflater;

    public OthersAdapter(Context context, ArrayList<LocalDealsDataFields> othersDataArray) {
        this.context = context;
        this.othersDataArray = othersDataArray;
        if (this.context != null) {
            layoutInflater = LayoutInflater.from(this.context);
        }
    }

    class OthersViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        TextView othersSmallTitleTextView;
        ImageView othersImageView;

        OthersViewHolder(View itemView) {
            super(itemView);
            othersSmallTitleTextView = (TextView) itemView.findViewById(R.id.others_small_title);
            othersImageView = (ImageView) itemView.findViewById(R.id.others_image);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            Intent couponDetailsItem = new Intent(context, LocalDealsActivity.class);
            Bundle extras = new Bundle();
            extras.putString(Constants.SECTION_NAME, context.getString(R.string.local_deals_section_title));
            // Add the offer id to the extras. This will be used to retrieve the coupon details
            // in the next activity
            extras.putInt(Constants.COUPONS_OFFER_ID, othersDataArray.get(
                    getAdapterPosition()).getLocalDealId());
            couponDetailsItem.putExtras(extras);
            context.startActivity(couponDetailsItem);
        }
    }

    @Override
    public OthersViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = layoutInflater.inflate(R.layout.others_items, parent, false);
        return new OthersViewHolder(view);
    }

    @Override
    public void onBindViewHolder(OthersViewHolder holder, int position) {
        String lfImage = othersDataArray.get(position).getLocalDealImage();
        String lfCategoryName = othersDataArray.get(position).getLocalDealSecondTitle();
        if (lfCategoryName != null) {
            // Set the second title
            holder.othersSmallTitleTextView.setText(lfCategoryName);
        }
        if (lfImage != null) {
            if (!lfImage.isEmpty()) {
                // Get the Uri
                Uri lfUriImage = Uri.parse(lfImage);
                // Load the Image
                Picasso.with(context).load(lfUriImage).into(holder.othersImageView);
            }
        }
    }

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

我想指出几件事-

和其他答案提到的对所有支持库使用相同的版本,我已经对所有支持库使用了25.1.0版本。

数据数组的大小为20并且从适配器的GetItemCount()方法返回20。

数据数组中有预期数量的项，并且它们不为null或空。

Clean build、invalidate/caches也不起作用。

最后，我使用FragmentStatePagerAdapter在选项卡处于焦点时加载片段。

编辑：

private void parseLocalDeals(String stringResponse) throws JSONException {
    JSONArray localJSONArray = new JSONArray(stringResponse);
    // If the array length is less than 10 then display to the end of the JSON data or else
    // display 10 items.
    int localArrayLength = localJSONArray.length() <= 20 ? localJSONArray.length() : 20;
    for (int i = 0; i < localArrayLength; i++) {
        // Initialize Temporary variables
        int localProductId = 0;
        String localSecondTitle = null;
        String localImageUrlString = null;
        JSONObject localJSONObject = localJSONArray.getJSONObject(i);
        if (localJSONObject.has(JSONKeys.KEY_LOCAL_DEAL_ID)) {
            localProductId = localJSONObject.getInt(JSONKeys.KEY_LOCAL_DEAL_ID);
        }
        if (localJSONObject.has(JSONKeys.KEY_LOCAL_DEAL_CATEGORY)) {
            localSecondTitle = localJSONObject.getString(JSONKeys.KEY_LOCAL_DEAL_CATEGORY);
        }
        if (localJSONObject.has(JSONKeys.KEY_LOCAL_DEAL_IMAGE)) {
            localImageUrlString = localJSONObject.getString(JSONKeys.KEY_LOCAL_DEAL_IMAGE);
        }

        if (localImageUrlString != null) {
            if (!localImageUrlString.isEmpty()) {
                // Remove the dots at the start of the Product Image String
                while (localImageUrlString.charAt(0) == '.') {
                    localImageUrlString = localImageUrlString.replaceFirst(".", "");
                }
                // Replace the spaces in the url with %20 (useful if there is any)
                localImageUrlString = localImageUrlString.replaceAll(" ", "%20");
            }
        }

        LocalDealsDataFields localDealsData = new LocalDealsDataFields();
        localDealsData.setLocalDealId(localProductId);
        localDealsData.setLocalDealSecondTitle(localSecondTitle);
        localDealsData.setLocalDealImage(localImageUrlString);

        localDealsDataArray.add(localDealsData);
    }

    // Initialize the Local Deals List only once and notify the adapter that data set has changed
    // from second time. If you initializeRV the localDealsRVAdapter at an early instance and only
    // use the notifyDataSetChanged method here then the adapter doesn't update the data. This is
    // because the adapter won't update items if the number of previously populated items is zero.
    if (localDealsCount == 0) {
        if (localArrayLength != 0) {
            // Populate the Local Deals list
            // Specify an adapter
            localDealsRVAdapter = new OthersAdapter(context, localDealsDataArray);
            localDealsRecyclerView.setAdapter(localDealsRVAdapter);
        } else {
            // localArrayLength is 0; which means there are no rv elements to show.
            // So, remove the layout
            contentMain.setVisibility(View.GONE);
            // Show no results layout
            showNoResultsIfNoData(localArrayLength);
        }
    } else {
        // Notify the adapter that data set has changed
        localDealsRVAdapter.notifyDataSetChanged();
    }
    // Increase the count since parsing the first set of results are returned
    localDealsCount = localDealsCount + 20;
    // Remove the progress bar and show the content
    prcVisibility.success();
}

编辑2：

对于那些想要详细探究代码的人，我已经将部分代码移到了另一个项目中，并在GitHub上共享了它。下面是链接https://github.com/gsrikar/tablayout，要了解层次结构，请查看自述文件。

谁能告诉我我错过了什么？

Answer 1

这不是一个很好的回答，但太长了，不适合发表评论。

我已经复制了（几乎）你的适配器代码，它完全为我工作。我相信我也做了和你一样的事。我使用相同的布局文件，相同的项目和相同的适配器用于所有选项卡。我认为您的适配器代码没有问题。

我说‘几乎’是因为我不得不更改一些东西，因为我没有访问您的数据。我更改了LocalDealsDataField模型以包含BitmapDrawable&我更改了OnBindViewWholder()来处理它。

    BitmapDrawable lfImage = othersDataArray.get(position).getLocalDealImage();
    holder.othersImageView.setBackground(lfImage);

这里是如何在onCreateView()中设置适配器的

    rootView = inflater.inflate(R.layout.recycler_view, container, false);
    mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerview);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
    mAdapter = new OthersAdapter(this.getContext(), list);
    mRecyclerView.setAdapter(mAdapter);