android - 带有 ArrayAdapter 和 ViewHolder 的 ListView 将图标添加到错误的项目

Question

我有一个使用 ArrayAdapter 的动态 ListView。当从微调器中选择一个名字时，该名字连同一个显示他们是男性还是女性的图标被添加到 ListView。

大多数情况下一切都很好(名称与图标一起正确添加到列表中)。但是显示性别的图标被添加到 ListView 中的错误项目。该名称被添加到列表的底部，但图标被放置在列表顶部的名称处。我不知道这是否是我使用 ViewHolder 的方式，但是 Android website 中关于它的文档为零.

// Listview inflater
inflater = (LayoutInflater) (this).getSystemService(LAYOUT_INFLATER_SERVICE);

// List Array.
mAdapter = new ArrayAdapter<String>(this, R.layout.player_simple_list, 
                                                 R.id.label, mStrings) {

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

        Log.i("ANDY","View getView Called");
        // A ViewHolder keeps references to children views to 
        // avoid unneccessary calls to findViewById() on each row.
        ViewHolder holder;

        if (null == convertView) {
            Log.i("ANDY","Position not previously used, so inflating");
            convertView = inflater.inflate(R.layout.player_simple_list, null);
            // Creates a ViewHolder and store references to the
            // two children views we want to bind data to.
            holder = new ViewHolder();
            holder.text = (TextView) convertView.findViewById(R.id.label);
            holder.icon = (ImageView) convertView.findViewById(R.id.icon);
            if (sexmale == true) {
                holder.icon.setImageBitmap(maleicon);
            }
            else {
                holder.icon.setImageBitmap(femaleicon);
            }
            convertView.setTag(holder);
        } else {
            // Get the ViewHolder back to get fast access to the TextView
            // and the ImageView.
            holder = (ViewHolder) convertView.getTag();

        }
        // Bind the data efficiently with the holder.
        holder.text.setText(getItem(position));
        // Change icon depending is the sexmale variable is true or false.
        Log.i("ANDY","getCount = "+mAdapter.getCount());
        return convertView;
    }
};
setListAdapter(mAdapter);

Answer 1

您必须在 if-else-if 之后设置图标以创建或绑定(bind) holder。否则，图标将仅在列表中的前几项中正确显示，即直到未填充 ListView。

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

    Log.i("ANDY","View getView Called");
    // A ViewHolder keeps references to children views
    // to avoid unneccessary calls to findViewById() on each row.
    ViewHolder holder;

        if (null == convertView) {
            Log.i("ANDY","Position not previously used, so inflating");
            convertView = inflater.inflate(R.layout.player_simple_list, null);

            // Creates a ViewHolder and store references to
            // the two children views we want to bind data to.
            holder = new ViewHolder();
            holder.text = (TextView) convertView.findViewById(R.id.label);
            holder.icon = (ImageView) convertView.findViewById(R.id.icon);
            convertView.setTag(holder);
        } else {
            // Get the ViewHolder back to get fast access to the TextView
            // and the ImageView.
            holder = (ViewHolder) convertView.getTag();

        }
        // Bind the data efficiently with the holder.
        holder.text.setText(getItem(position));

        // Change icon depending is the sexmale variable is true or false.
        if (sexmale == true) {
            holder.icon.setImageBitmap(maleicon);
        }
        else {
            holder.icon.setImageBitmap(femaleicon);
        }
        Log.i("ANDY","getCount = "+mAdapter.getCount());
        return convertView;
}