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java - Android RecyclerView 和 onBindViewHolder

问题描述

我在每个项目上都有一个 TextView 并添加holder.item_edit_text.addTextChangedListener了onBindViewHolder一个长列表和一个在片段级别计算总数的界面，但奇怪的是，当用户在一个视图上键入时，onBindViewHolder会在多个项目上调用。IE 如果用户输入 5，我会得到 5 的倍数，具体取决于回收率（列表中的项目数），例如 15 或 25

RECYCLERVIEW onBindViewHolder

holder.item_edit_text.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence amount, int start, int before, int count) {
            calculateTotal.onAmountAdded(current, amount.toString());
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });

    @Override
      public int getItemCount() {
        if (Accounts != null) {
        return Accounts.size();
    }
    return 0;
   }

问题是我如何确保onBindViewHolder每次在 recyclerview 中调用一个项目

片段

     @Override
public void onAmountAdded(Account account, String amount) {
private Map<Account, String> orderItems = new HashMap<>();        
    if (amount.length() < 9) {
        orderItems.put(account, amount);
        int newTotal = 0;
        Iterator iterator = orderItems.entrySet().iterator();
        while (iterator.hasNext()) {
            try {
                Map.Entry mentry = (Map.Entry) iterator.next();
                newTotal += Integer.parseInt(mentry.getValue().toString());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        text_total.setText(ValidationUtil.formatNumber(String.valueOf(newTotal)));
        return;
    }
}

标签： javaandroidandroid-recyclerviewrecyclerview-layout

解决方案

我想没有足够的信息。

而不是在 viewBinder 上添加 TextWatcher

将其添加到您的 ViewHolder 类中

class ViewHolder extends RecyclerView.ViewHolder {

    private TextView item_edit_text;

    ViewHolder(View itemView) {
        super(itemView);
        item_edit_text = itemView.findViewById(R.id.item_edit_text);
        item_edit_text.addTextChangedListener(new TextWatcher() {
                @Override
                public void beforeTextChanged(CharSequence s, int start, int count, int after) {

                }

                @Override
                public void onTextChanged(CharSequence amount, int start, int before, int count) {
                   //not sure why this current variable is for
                  //if its current Account 
                   Accounts current = Accounts.get(getLayoutPosition());
                   calculateTotal.onAmountAdded(current, amount.toString());
                }

                @Override
                public void afterTextChanged(Editable s) {

                }
            });
        }
    }

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