notifyItemChanged方法recyclerview不叫onBindViewHolder

Question

我的代码如下所示：

public class PopularItemsAdapter extends RecyclerView.Adapter<PopularItemsAdapter.MyViewHolder> 
     implements MyCartListener { 

    private Context mContext; 
    private List<FoodTruckItem> foodTruckItemList; 
    private boolean isClickable = false; 
    private OnItemClickListener listener; 
    private List<FoodtruckInfo> foodtruckInfoList = new ArrayList<>(); 
    private List<FoodTruckItem> sessionItem = new ArrayList<>(); 
    private boolean isConflictResolved = false; 
    public int position = -1; 


    @Override 
    public void itemUpdated(int quantity, String itemId) { 
     for (int i = 0; i < foodTruckItemList.size(); i++) { 
      if (itemId.equals(foodTruckItemList.get(i).getItemId())) { 
       foodTruckItemList.get(i).setItemQuantityOrdered(quantity); 
//    notifyDataSetChanged(); 
      } 
     } 
    } 

    @Override 
    public void itemRemoved(String itemId) { 
     for (int j = 0; j < foodTruckItemList.size(); j++) { 
      if (itemId.equals(foodTruckItemList.get(j).getItemId())) { 
       foodTruckItemList.remove(j); 
//    notifyDataSetChanged(); 
      } 
     } 
    } 

    public void addConflictItem(int position) { 
     isConflictResolved = true; 
     notifyItemChanged(position); 
    } 

    public interface OnItemClickListener { 
     void onItemClick(FoodTruckItem foodTruckItem, FoodtruckInfo foodtruckInfo); 

     void showSnackBar(int items, boolean added, int position); 

     void showRestaurentClosed(); 

     void showWarningDialog(int position); 
    } 


    public void addFoodInfo(List<FoodtruckInfo> foodtruckInfos) { 
     foodtruckInfoList.addAll(foodtruckInfos); 
    } 


    public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { 
     public TextView itemName, foodPrice, addText, quantityText, addQuantity, removeQuantity; 
     public ImageView itemImage, itemTag; 
     public LinearLayout addLayout; 

     public MyViewHolder(View view) { 
      super(view); 
      itemTag = (ImageView) view.findViewById(R.id.itemTag); 
      itemImage = (ImageView) view.findViewById(R.id.itemImage); 
      itemName = (TextView) view.findViewById(R.id.itemName); 
      foodPrice = (TextView) view.findViewById(R.id.foodPrice); 
      addText = (TextView) view.findViewById(R.id.addText); 
      addLayout = (LinearLayout) view.findViewById(R.id.addLayout); 
      quantityText = (TextView) view.findViewById(R.id.quantityText); 
      addQuantity = (TextView) view.findViewById(R.id.addQuantity); 
      removeQuantity = (TextView) view.findViewById(R.id.removeQuantity); 
      view.setOnClickListener(this); 
     } 

     @Override 
     public void onClick(View view) { 
      FoodtruckInfo foodtruckInfo = new FoodtruckInfo(); 
      //passing the clicked position to the parent class 
      for (FoodtruckInfo info : foodtruckInfoList) { 
       if (info.getItemId().equals(foodTruckItemList.get(getAdapterPosition()).getItemId())) { 
        foodtruckInfo = info; 
       } 
      } 
      listener.onItemClick(foodTruckItemList.get(getAdapterPosition()), foodtruckInfo); 
     } 
    } 


    public PopularItemsAdapter(Context mContext, List<FoodTruckItem> foodTruckItemList, OnItemClickListener listener) { 
     this.mContext = mContext; 
     this.foodTruckItemList = foodTruckItemList; 
     this.listener = listener; 
     MyCart.getInstance().addListener(this); 
    } 

    @Override 
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     View itemView = LayoutInflater.from(parent.getContext()) 
       .inflate(R.layout.card_view_popular_items, parent, false); 

     return new MyViewHolder(itemView); 
    } 

    @Override 
    public int getItemViewType(int position) { 
     return position; 
    } 

    @Override 
    public void onBindViewHolder(final MyViewHolder holder, final int position) { 
     final FoodTruckItem foodTruckItem = foodTruckItemList.get(position); 
     if (SessionManager.get(mContext).getFoodTruckItemList() != null) { 
      sessionItem = SessionManager.get(mContext).getFoodTruckItemList(); 
      for (FoodTruckItem item : sessionItem) { 
       if (item.getItemId().equals(foodTruckItem.getItemId())) { 
//     holder.itemTag.setText("MY FAVOURITE"); 
        holder.itemTag.setImageDrawable(ContextCompat.getDrawable(mContext, R.drawable.ic_favorite)); 
       } 
      } 
     } 

     holder.itemName.setText(foodTruckItem.getItemName()); 
//  holder.itemTag.setText(foodTruckItem.getSpecialTag()); 
     holder.foodPrice.setText("$" + String.valueOf(foodTruckItem.getItemPrice())); 
     Picasso.Builder builder = new Picasso.Builder(mContext); 
     builder.listener(new Picasso.Listener() { 
      @Override 
      public void onImageLoadFailed(Picasso picasso, Uri uri, Exception exception) { 
       exception.printStackTrace(); 
      } 
     }); 
     if (!TextUtils.isEmpty(foodTruckItem.getItemImg())) { 
      builder.build().load(foodTruckItem.getItemImg()).into(holder.itemImage); 
     } 
     holder.addText.setOnClickListener(new View.OnClickListener() { 
      FoodtruckInfo info = new FoodtruckInfo(); 

      @Override 
      public void onClick(View v) { 
       for (int l = 0; l < foodtruckInfoList.size(); l++) { 
        if (foodtruckInfoList.get(l).getItemId().equals(foodTruckItem.getItemId())) { 
         if (foodtruckInfoList.get(l).getOrderStatus() == 0) { 
          isClickable = true; 
         } else { 
          isClickable = false; 
         } 
        } 
       } 
       if (isClickable) { 
        String foodTruckId = null; 
        if (MyCart.getInstance().getFoodTruckId() != null) { 
         foodTruckId = MyCart.getInstance().getFoodTruckId(); 
         if (!foodTruckId.equals(foodtruckInfoList.get(position).getFoodTruckId())) { 
          listener.showWarningDialog(position); 
         } else { 
          addItem(holder, position, foodTruckItem); 
         } 
        } else { 
         isConflictResolved = false; 
         addItem(holder, position, foodTruckItem); 
        } 
       } else { 
        listener.showRestaurentClosed(); 
       } 

       if (isConflictResolved) { 
        isConflictResolved = false; 
        addItem(holder, position, foodTruckItem); 
       } 
      } 
     }); 

     holder.addQuantity.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       int quantity = foodTruckItem.getItemQuantityOrdered(); 
       quantity += 1; 
       holder.quantityText.setText(String.valueOf(quantity)); 
       MyCart.getInstance().updateQuantity(quantity, foodTruckItem.getItemId(), false); 
      } 
     }); 

     holder.removeQuantity.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       int quantity = foodTruckItem.getItemQuantityOrdered(); 
       quantity -= 1; 
       if (quantity == 0) { 
        MyCart.getInstance().removeItem(foodTruckItem.getItemId(), false); 
        holder.addLayout.setVisibility(View.INVISIBLE); 
        holder.addText.setVisibility(View.VISIBLE); 
        listener.showSnackBar(quantity, false, position); 
       } else { 
        holder.quantityText.setText(String.valueOf(quantity)); 
        MyCart.getInstance().updateQuantity(quantity, foodTruckItem.getItemId(), false); 
       } 
      } 
     }); 
     setFontStyle(holder); 
    } 


    private void addItem(MyViewHolder holder, int position, FoodTruckItem foodTruckItem) { 
     holder.addLayout.setVisibility(View.VISIBLE); 
     holder.addText.setVisibility(View.INVISIBLE); 
     foodTruckItem.setItemQuantityOrdered(1); 
     holder.quantityText.setText(String.valueOf(1)); 
     MyCart.getInstance().addItem(foodTruckItem); 
     MyCart.getInstance().setFoodTruckId(foodtruckInfoList.get(position).getFoodTruckId()); 
     listener.showSnackBar(MyCart.getInstance().getItemList(), true, position); 

    } 

    private void setFontStyle(MyViewHolder holder) { 
     holder.itemName.setTypeface(Typeface.createFromAsset(mContext.getAssets(), Consts.montserrat_bold)); 
//  holder.itemTag.setTypeface(Typeface.createFromAsset(mContext.getAssets(), Consts.montserrat_bold)); 
     holder.foodPrice.setTypeface(Typeface.createFromAsset(mContext.getAssets(), Consts.montserrat_bold)); 
     holder.addText.setTypeface(Typeface.createFromAsset(mContext.getAssets(), Consts.montserrat_bold)); 
    } 


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

这里addConflictItem()我已经写了notifyItemChanged，但不知何故，他并没有叫onBindViewHolder，所以有什么应用程序缺少什么？

Answer 1

只是调用notifyDataSetChanged（）和RecycleView将刷新