在RecyclerView中點擊商品

Question

我目睹了RecyclerView異常行為。 所以我已經設置在一個OnClickListener ViewHolder上的Button這是為了做3兩件事，當用戶點擊：

1. 將當前項目的數據添加到ArrayList [顯示在另一個Fragment ]

2. 向用戶顯示Toast 。

3. 修改所選項目的用戶界面。 [例如，將Button的setVisibility設置為View.INVISIBLE等。]

現在，雖然OnClickListener的前兩個任務已成功完成並且僅適用於選定的項目，但是第三個任務僅用於修改選定項目的UI，而是也適用於RecyclerView上的每個第9個項目。

1. 如何防止這種行為？
2. 為什么僅在第三項任務中會出現這種現象？

即從以前的答案。 我看到特定的主題，我認為這是更好地插入概念OnClickListener在ViewHolder而不是把它在onBindViewHolder ，這並沒有解決問題。 我遵循了關於stackOverflow的其他建議，但都失敗了。

這是我的代碼：

static class ItemsRecyclerAdapter extends RecyclerView.Adapter<ItemsRecyclerAdapter.ItemsViewHolder>{

    FragmentActivity fragmentActivity;
    List<ProductItem> data;
    LayoutInflater inflater;
    private int id;
    private int shopCode;

    public ItemsRecyclerAdapter(List<ProductItem> data, FragmentActivity fragmentActivity, int id, int shopCode) {
        this.fragmentActivity = fragmentActivity;
        this.data = data;
        this.inflater = LayoutInflater.from(fragmentActivity);
        this.id = id;
        this.shopCode = shopCode;
    }

    @Override
    public ItemsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = inflater.inflate(R.layout.pricing_item, parent, false);

        return new ItemsViewHolder(v);
    }

    @Override
    public void onBindViewHolder(final ItemsViewHolder holder, int position) {
        ProductItem itemPrice = data.get(position);
        holder.productName.setText(itemPrice.getProductName());
        holder.quantity.setText(itemPrice.getProductQuantity());
        holder.tvPrice.setText(itemPrice.getproductPrice());
        Picasso.with(fragmentActivity).load(itemPrice.getThumbUrl()).into(holder.imgProduct);

    }

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


        class ItemsViewHolder extends RecyclerView.ViewHolder{

        TextView productName, quantity, tvPrice;
        ImageView imgProduct;
        Button btnAddToBasket, btnAdd, btnRemove;

        Typeface myCustomFont = Typeface.createFromAsset(fragmentActivity.getAssets(), "fonts/Assistant-SemiBold.ttf");

        public ItemsViewHolder(View itemView) {
            super(itemView);
            productName = (TextView) itemView.findViewById(R.id.productName);
            quantity = (TextView) itemView.findViewById(R.id.manufacturer);
            tvPrice = (TextView) itemView.findViewById(R.id.tvPrice);
            imgProduct = (ImageView) itemView.findViewById(R.id.imgProduct);
            btnAddToBasket = (Button) itemView.findViewById(R.id.btnAddToBasket);
            btnAdd = itemView.findViewById(R.id.btnAdd);
            btnRemove = itemView.findViewById(R.id.btnRemove);

            btnAdd.setVisibility(View.INVISIBLE);
            btnRemove.setVisibility(View.INVISIBLE);

            quantity.setTypeface(myCustomFont);
            productName.setTypeface(myCustomFont);
            tvPrice.setTypeface(myCustomFont);

            Typeface fontAwesomeBasketIcon = Typeface.createFromAsset(fragmentActivity.getAssets(), "fontawesome-webfont.ttf");
            btnAddToBasket.setTypeface(fontAwesomeBasketIcon);
            btnAdd.setTypeface(fontAwesomeBasketIcon);
            btnRemove.setTypeface(fontAwesomeBasketIcon);



            btnAddToBasket.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int pos = getAdapterPosition();

                    MyBasketFragment.myBasketList
                            .add(new ProductItem(data.get(pos).getProductName(), data.get(pos).getProductQuantity(),
                                    data.get(pos).getproductPrice(), data.get(pos).getThumbUrl(), id, shopCode));

                    btnAddToBasket.setOnClickListener(null);


                    Toast.makeText(fragmentActivity, "New product..", Toast.LENGTH_SHORT).show();



                    btnAdd.setVisibility(View.VISIBLE);
                    btnRemove.setVisibility(View.VISIBLE);


                }
            });

            btnAdd.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    ItemsFragment.atomic.incrementAndGet();
                    btnAddToBasket.setText(String.valueOf(atomic.get()));
                }
            });
        }
    }

  }

Answer 1

每次單擊項目時，我都會在實例化對象中將一個布爾值分配為true，然后運行notifyDataSetChanged() 。 使用具有boolean true的數據對象更新所有項目。 這樣，我確保只有選定的對象將被更新。

看起來像這樣：

ViewHolder

    class ItemsViewHolder extends RecyclerView.ViewHolder {

        TextView productName, quantity, tvPrice;
        ImageView imgProduct;
        Button btnAddToBasket, btnAdd, btnRemove;

        Typeface myCustomFont = Typeface.createFromAsset(fragmentActivity.getAssets(), "fonts/Assistant-SemiBold.ttf");

        public ItemsViewHolder(View itemView) {
            super(itemView);
            productName = (TextView) itemView.findViewById(R.id.productName);
            quantity = (TextView) itemView.findViewById(R.id.manufacturer);
            tvPrice = (TextView) itemView.findViewById(R.id.tvPrice);
            imgProduct = (ImageView) itemView.findViewById(R.id.imgProduct);
            btnAddToBasket = (Button) itemView.findViewById(R.id.btnAddToBasket);
            btnAdd = itemView.findViewById(R.id.btnAdd);
            btnRemove = itemView.findViewById(R.id.btnRemove);

            btnAdd.setVisibility(View.INVISIBLE);
            btnRemove.setVisibility(View.INVISIBLE);

            quantity.setTypeface(myCustomFont);
            productName.setTypeface(myCustomFont);
            tvPrice.setTypeface(myCustomFont);

            Typeface fontAwesomeBasketIcon = Typeface.createFromAsset(fragmentActivity.getAssets(), "fontawesome-webfont.ttf");
            btnAddToBasket.setTypeface(fontAwesomeBasketIcon);
            btnAdd.setTypeface(fontAwesomeBasketIcon);
            btnRemove.setTypeface(fontAwesomeBasketIcon);


        }

        public void bind(final ProductItem item) {
            btnAddToBasket.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    item.clicked = true;
                    item.atomic.incrementAndGet();

                    Toast.makeText(fragmentActivity, "New product..", Toast.LENGTH_SHORT).show();

                    notifyDataSetChanged();

                    MyBasketFragment.myBasketList
                            .add(new ProductItem(item.getProductName(), item.getProductQuantity(),
                                    item.getproductPrice(), item.getThumbUrl(), id, shopCode));
                }
            });

            btnAdd.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    ItemsFragment.atomic.incrementAndGet();
                    btnAddToBasket.setText(String.valueOf(atomic.get()));
                }
            });
        }
    }

onBindViewHolder

 @Override
    public void onBindViewHolder(final ItemsViewHolder holder, final int position) {
        ProductItem itemPrice = data.get(position);
        holder.productName.setText(itemPrice.getProductName());
        holder.quantity.setText(itemPrice.getProductQuantity());
        holder.tvPrice.setText(itemPrice.getproductPrice());
        Picasso.with(fragmentActivity).load(itemPrice.getThumbUrl()).into(holder.imgProduct);

        holder.bind(itemPrice);

        if(itemPrice.clicked){
            holder.btnAddToBasket.setOnClickListener(null);

            holder.btnAddToBasket.setText(String.valueOf(atomic.get()));
            holder.btnAdd.setVisibility(View.VISIBLE);
            holder.btnRemove.setVisibility(View.VISIBLE);

        } else {
            holder.btnAddToBasket.setText("\uf291");
            holder.btnAdd.setVisibility(View.INVISIBLE);
            holder.btnRemove.setVisibility(View.INVISIBLE);
        }
    }

Answer 2

我認為getAdapterPosition()引起了問題。 請嘗試在視圖onBindViewHolder創建一個新的int屬性position ， onBindViewHolder將該位置傳遞給視圖支架， holder.position = position ，並在您的視圖支架中使用該位置，因此將是int pos = position而不是getAdapterPosition()