RecyclerView不刷新 [英] RecyclerView is not refreshing

问题描述

在我的应用程序中，我从Web服务器接收到一些数据.此数据将发送到 RecyclerView .首先，所有数据均显示良好.但是，当我尝试刷新它时，不再显示数据.数据来自Web服务(已使用Logcat验证).

In my application I receive some data from a web server. This data is sent to a RecyclerView. Firstly, all data is displayed fine. However, when I try to refresh it, the data no-longer shows. The data arrives from the web service (as verified using Logcat).

ArrayList<FoodItem> allFood = response.body();
if(foodAdapter != null) {
    foodAdapter.swap(allFood);
} else {
    foodAdapter = new FoodAdapter(FoodViewForCustomerActivity.this, allFood);
}
photoCollectionView.setAdapter(foodAdapter);

我的 RecyclerView 适配器

public class FoodAdapter extends RecyclerView.Adapter<FoodAdapter.ViewHolder> {
    Context mContext;
    ArrayList<FoodItem> foodItems;

    public FoodAdapter(Context context, ArrayList<FoodItem> foodItems) {
        this.mContext = context;
        this.foodItems = foodItems;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.food_item_row, parent, false);
        return new ViewHolder(view);
    }

    public void swap(ArrayList<FoodItem> newFoods) {
        foodItems.clear();
        foodItems.addAll(newFoods);
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                notifyDataSetChanged();
            }
        }, 500);
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        FoodItem foodItem = foodItems.get(position);
        String stringPicture = foodItem.getPhoto();
        byte[] decodedPictureStringArray = Base64.decode(stringPicture, Base64.DEFAULT);
        Bitmap bitmapPhoto = BitmapFactory.decodeByteArray(decodedPictureStringArray, 0, decodedPictureStringArray.length);
        Uri photoUri = getImageUri(mContext, bitmapPhoto);
        Picasso.with(mContext).load(photoUri).resize(300, 300)
            .centerCrop().into(holder.foodImage);
        holder.foodItemNameText.setText(foodItem.getFoodItemName());
        holder.foodPriceText.setText(foodItem.getUnitPrice() + " / " + foodItem.getUnitType());
    }
    public Uri getImageUri(Context inContext, Bitmap inImage) {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        inImage.compress(Bitmap.CompressFormat.JPEG, 10, bytes);
        String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
        return Uri.parse(path);
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        public ImageView foodImage;
        public TextView foodItemNameText;
        public TextView foodPriceText;

        public ViewHolder(View itemView) {
            super(itemView);
            foodImage = (ImageView) itemView.findViewById(R.id.foodPhoto);
            foodItemNameText = (TextView) itemView.findViewById(R.id.foodItemNameText);
            foodPriceText = (TextView) itemView.findViewById(R.id.foodPriceText);
        }
    }
}

包含我的工具栏和 RecyclerView

的 RelativeLayout

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  tools:context=".FoodViewForCustomerActivity">

  <include
      android:id="@+id/toolbar"
      layout="@layout/toolbar"
      />
  <android.support.v7.widget.RecyclerView
      android:layout_below="@id/toolbar"
      android:id="@+id/photoCollectionView"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="#f8f8f8"
      android:divider="@null"
      android:listSelector="@android:color/transparent"/>
</RelativeLayout>

推荐答案

很抱歉，回答了我自己的问题.我通过遵循此处提供的解决方案解决了我的问题.我的问题的主要原因是RecyclerView在调用时没有调用onCreateViewHolder或onBindView.我正在尝试刷新它.

Sorry, for answering my own question. I solved my question by following solution provided here.Main cause of my problem was that RecyclerView was not calling onCreateViewHolder or onBindView, when i was trying to refresh it.

这篇关于RecyclerView不刷新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！