Question

我按照教程here制作了一个复选框列表，我的适配器看起来像这样：

private class ViewHolder{
    CheckBox name;
}

@Override
public View getView(final int position, View convertView, final ViewGroup parent) {

    ViewHolder holder = null;
    LayoutInflater settingInflater = LayoutInflater.from(getContext());
    if (convertView == null) {
        convertView = settingInflater.inflate(R.layout.custom_row, parent, false);
        holder = new ViewHolder();
        holder.name = (CheckBox) convertView.findViewById(R.id.checkBox1);
        convertView.setTag(holder);

        holder.name.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                CheckBox cb = (CheckBox) v;
                CustomCheckbox theCheckbox = (CustomCheckbox) cb.getTag();
                Toast.makeText(getContext(),
                        "Clicked on Checkbox: " + cb.getText(),
                        Toast.LENGTH_SHORT).show();
                Log.e(TAG,Integer.toString(position));

        });
    }else{
        holder = (ViewHolder)convertView.getTag();
    }

}

当我启动此视图时，我的屏幕上大约有15个条目，但是当我向下滚动并选择第16个复选框时，它的位置再次回到零，并且以下条目相应地变为1,2,3 ....我如何实现持有人，以便为每个复选框获得正确的位置编号？

谢谢！

Answer 1

ListView回收视图确实只有在视图未被回收时才定义点击监听器，因此当您点击“旧”监听器仍处于活动状态时

  if (convertView == null) {
        //here you have new view
        convertView = settingInflater.inflate(R.layout.custom_row, parent, false);
        holder = new ViewHolder();
        holder.name = (CheckBox) convertView.findViewById(R.id.checkBox1);
        convertView.setTag(holder);
    }else{
        //here you get recycled view
        holder = (ViewHolder)convertView.getTag();
    }
    //you should put you code here after you retrieve your view (either new or recycled)
    holder.name.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            CheckBox cb = (CheckBox) v;
            CustomCheckbox theCheckbox = (CustomCheckbox) cb.getTag();
            Toast.makeText(getContext(),
                    "Clicked on Checkbox: " + cb.getText(),
                    Toast.LENGTH_SHORT).show();
            Log.e(TAG,Integer.toString(position));

    });

Android ListView回收机制

1 个答案: