android - 滚动带有 Spinner 的 ListView 时如何在 Spinner 中保持值(value)？

Question

我正面临这个问题，已经阅读了很多问题/答案但无法解决。

我有一个带有微调器的 ListView(用户必须为该行中的产品选择一个数量)，但是当项目多于 View 并且在微调器中选择一个数字后滚动 ListView 时，这个数字消失并且再次显示默认值。

我在 ListView 本身的适配器内部创建了一个 Spinner 适配器:

    final ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(context, R.layout.layout_spinner_quanitdade, quantities) {

    public View getView(int position, View convertView, ViewGroup parent) {
        View v = super.getView(position, convertView, parent);
        ((TextView) v).setTextSize(18);
        return v;
    }

    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        View v = super.getDropDownView(position, convertView, parent);
        ((TextView) v).setGravity(Gravity.END);
        return v;
    }
};

holder.spinnerQuantidade.setAdapter(spinnerAdapter);
holder.spinnerQuantidade.setOnItemSelectedListener(new OnItemSelectedListener() {

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int spinnerPosition, long id) {

        String newQuantity = quantities[spinnerPosition];
        item.setQuantidade(newQuantity);

        Spinner theSpinner = (Spinner) parent;
        theSpinner.setSelection(spinnerPosition);
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
    }
});

在尝试在微调器中选择一个值之前(查看带有 IMEI 字样的行):

在微调器中为该行选择一个值后:

向上滚动然后向下滚动后(值变回 1，而不是我选择的 10):

更新:更改为尝试保留和设置微调器选择，但没有用:

    public View getView(final int modelPosition, View view, ViewGroup parent) {
    ViewHolder holder = null;
    final Produto item = getItem(modelPosition);

    LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
    if (view == null) {
        view = mInflater.inflate(R.layout.item_view_produto, parent, false);
        holder = new ViewHolder();
        holder.textViewCodigo = (TextView) view.findViewById(R.id.textViewCodigo);
        holder.textViewNome = (TextView) view.findViewById(R.id.textViewNome);
        holder.spinnerQuantidade = (Spinner) view.findViewById(R.id.spinnerQuantidade);
        holder.spinnerQuantidade.setTag(modelPosition);

        CheckBox chk = (CheckBox) view.findViewById(R.id.checkBox);
        holder.checkBox = chk;
        holder.checkBox.setTag(modelPosition);

        view.setTag(holder);
    } else {
        holder = (ViewHolder) view.getTag();
    }

    if (modelPosition % 2 == 0) {
        view.setBackgroundResource(R.drawable.cor_zebra2);
    } else {
        view.setBackgroundResource(R.drawable.cor_zebra1);
    }

    holder.textViewCodigo.setText(item.getCodigo());
    holder.textViewNome.setText(item.getDescricao().trim());

// checking and settion spinner selection - DID NOT WORK
    if (mapRowSpinnerPos.containsKey(modelPosition)) {
        holder.spinnerQuantidade.setSelection(mapRowSpinnerPos.get(modelPosition));
    }

    if (this.showChecks) {
        holder.spinnerQuantidade.setVisibility(View.GONE);

        holder.checkBox.setOnCheckedChangeListener(null);
        holder.checkBox.setChecked(item.isChecked());
        holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                item.setChecked(isChecked);
                if (isChecked) {
                    selectedList.add(item);
                } else {
                    selectedList.remove(item);
                }
            }
        });
    } else {
        // situation 2: show spinners
        holder.checkBox.setVisibility(View.GONE);

        final ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(context, R.layout.layout_spinner_quanitdade, quantities) {

            public View getView(int position, View convertView, ViewGroup parent) {
                View v = super.getView(position, convertView, parent);
                ((TextView) v).setTextSize(18);
                return v;
            }

            public View getDropDownView(int position, View convertView, ViewGroup parent) {
                View v = super.getDropDownView(position, convertView, parent);
                ((TextView) v).setGravity(Gravity.END);
                return v;
            }
        };

        holder.spinnerQuantidade.setAdapter(spinnerAdapter);
        holder.spinnerQuantidade.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int spinnerPosition, long id) {

                // int thePosition = (Integer) parent.getTag();
                mapRowSpinnerPos.put(modelPosition, spinnerPosition);

                String newQuantity = quantities[spinnerPosition];
                item.setQuantidade(newQuantity);

            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });
    }

    return view;
}

Answer 1

设置适配器后移动以下代码。设置适配器会将其设置到第一个位置。

if (mapRowSpinnerPos.containsKey(modelPosition)) {
    holder.spinnerQuantidade.setSelection(mapRowSpinnerPos.get(modelPosition));
}