android - 为什么自定义ArrayAdapter的getView在EditText的TextWatcher中的位置无法预测？(Why is position of my custom ArrayAdapter's getView in EditText's TextWatcher unpredictable?)

Question

I created a custom ArrayAdapter that on click of the add button in the menu will pop-up a dialog (Entering item's name, price and quantity) to add a new item.

(我创建了一个自定义ArrayAdapter，单击菜单中的“添加”按钮将弹出一个对话框（输入项目的名称，价格和数量）以添加新项目。)

However, if I add another item.

(但是，如果我添加另一个项目。)

The price I entered on the second item will also affect the first item.

(我在第二个项目上输入的价格也会影响第一个项目。)

And if I add another more items, the latest price will be the same values for the other items.

(如果我再添加其他项目，则其他项目的最新价格将相同。)

If I try to change the item's value (using its EditText), it gives unpredictable results.

(如果我尝试更改项目的值（使用其EditText），则会产生不可预测的结果。)

And if I try deleting any items, the program crashes.

(如果我尝试删除任何项目，程序将崩溃。)

I narrowed down why it acts like that and the problem was that the TextWatcher gets invoke a lot of times and the position inside is not consistent to how it was defined.

(我缩小了为什么会这样，问题是TextWatcher被调用了很多次，并且内部位置与定义的方式不一致。)

I want to know how to solve this problem.

(我想知道如何解决这个问题。)

Here's an image of the program: My App (After entering the third item, all of the price values are the same as the third item, which is c)

(这是程序的图像： 我的应用程序（输入第三项后，所有价格值都与第三项相同，即c）)

And here's the code:

(这是代码：)

@NonNull
@Override
public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    if (inflater == null) {
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }
    if (convertView == null) {
        convertView = inflater.inflate(R.layout.item_listview, null);
    }

    ImageButton deleteButton = convertView.findViewById(R.id.deleteImageButton);
    TextView itemTextView = convertView.findViewById(R.id.itemTextView);
    EditText quantityEditText = convertView.findViewById(R.id.quantityEditText);
    EditText priceEditText = convertView.findViewById(R.id.priceEditText);

    priceEditText.setText(String.format(Locale.ENGLISH, "%.2f", prices.get(position)));
    itemTextView.setText(getItem(position));
    quantityEditText.setText(String.valueOf(quantities.get(position)));

    /*

        some filters here...

     */

    priceEditText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void afterTextChanged(Editable editable) {
            String value = editable.toString();
            if (editable.toString().isEmpty() || editable.toString().equals("."))
                value = "0";
            prices.set(position, Double.parseDouble(value));
            listener.onItemCountChange(getCount() + 1, getCount());
        }
    });

    deleteButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            remove(getItem(position));
            prices.remove(position);
            quantities.remove(position);
            listener.onItemCountChange(getCount() + 1, getCount());
        }
    });

    return convertView;
}

Oh and I tried looking for solutions here too in StackOverFlow (holder; get/set tag; other random stuffs).

(哦，我也尝试过在StackOverFlow中寻找解决方案（holder； get / set标签；其他随机的东西）。)

I saw around 10 posts and to no avail did I comprehend how to fix this.

(我看到了大约10个帖子，但没有理解如何解决此问题。)

Feel free to ask me for missing info and correct me where I'm doing it wrong.

(随时问我丢失的信息，并在错误的地方纠正我。)

I appreciate your help!

(我感谢您的帮助！)

And also forgive me I'm still a bit new to Android development.

(同时请原谅我对Android开发还是有点陌生??。)

  ask by ドラゴンハートゼクモル translate from so

Answer 1

等待大神答复