Listview，自定义适配器和复选框 [英] Listview, custom adapter and checkboxes

问题描述

我的适配器有问题。下面是代码：

i got an issue with my adapter. Here is the code:

@Override
public View getView(final int position, final View convertView, final ViewGroup parent) {
    final ViewHolder viewHolder;
    View view = convertView;
    if (view == null) {
        view = LayoutInflater.from(mContext).inflate(R.layout.row, parent, false);
        viewHolder = new ViewHolder();

        viewHolder.textTitle = (TextView) view.findViewById(R.id.title);
        viewHolder.checkBox = (CheckBox) view.findViewById(R.id.checkBox);

        viewHolder.checkBox.setTag(position);
        view.setTag(viewHolder);

        viewHolder.imageView = (ImageView) view.findViewById(R.id.activity_googlecards_card_imageview);
    } else {
        viewHolder = (ViewHolder) view.getTag();
        viewHolder.checkBox.getTag(position);
    }

    viewHolder.textTitle.setText(getItem(position).getTitle());

    viewHolder.checkBox.setChecked(myIntegerArrayList.contains(position));
    viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                myIntegerArrayList.add(position);
            } else {
                myIntegerArrayList.remove((Object) position);
            }
        }
    });

    return view;
}

private static class ViewHolder {
    TextView textTitle;
    CheckBox checkBox;
}

复选框本身可以正常工作。.我的意思是，该位置已正确添加到我的数组列表，但是如果（假设我检查了位置0的项目）我滚动到底部，那么，滚动回顶部，则项目0返回未选中状态，即使该位置位于我的数组列表中（已通过日志验证）

The checkbox itself works fine.. I mean, the position is correctly added to my arraylist but if (assuming i checked the item at position 0) i scroll to bottom, then, scroll back to top the item 0 return unchecked even if the position is into my arraylist (verified with logs)

推荐答案

从中移出 viewHolder.checkBox.setTag（position）; 并在<$ c $中用 viewHolder.checkBox.getTag（）; 更改位置 c> onCheckedChanged ，因此您的代码必须类似于：

move out viewHolder.checkBox.setTag(position); from if and change position with viewHolder.checkBox.getTag(); in onCheckedChanged, so your code must be like:

@Override
public View getView(final int position, final View convertView, final ViewGroup parent) {
    final ViewHolder viewHolder;
    View view = convertView;
    if (view == null) {
        view = LayoutInflater.from(mContext).inflate(R.layout.row, parent, false);
        viewHolder = new ViewHolder();

        viewHolder.textTitle = (TextView) view.findViewById(R.id.title);
        viewHolder.checkBox = (CheckBox) view.findViewById(R.id.checkBox);


        view.setTag(viewHolder);

        viewHolder.imageView = (ImageView) view.findViewById(R.id.activity_googlecards_card_imageview);
    } else {
        viewHolder = (ViewHolder) view.getTag();
        viewHolder.checkBox.getTag(position);
    }
    viewHolder.checkBox.setTag(position);

    viewHolder.textTitle.setText(getItem(position).getTitle());

    viewHolder.checkBox.setChecked(myIntegerArrayList.contains(position));
    viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                myIntegerArrayList.add(viewHolder.checkBox.getTag());
            } else {
                myIntegerArrayList.remove((Object) viewHolder.checkBox.getTag());
            }
        }
    });

    return view;
}

您需要移出 viewHolder.checkBox.setTag（位置）； 因为回收ListView ，您需要保存您的要在 onCheckedChanged 中获得该位置。

you need move out viewHolder.checkBox.setTag(position); because Recycle ListView, you need save your position in Tag to getting that in onCheckedChanged.

您需要使用 viewHolder.checkBox。 getTag（）; in onCheckedChanged 因为同样的原因。

you need use viewHolder.checkBox.getTag(); in onCheckedChanged because same reason.

很高兴提供帮助

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