java - 更新自定义 ListView 项目

Question

我有一个 ListView ，它使用基于基本适配器的自定义适配器。 ListView 使用外部数据填充正常，我可以拾取单击事件并知道已选择哪个项目。

我在更新所单击项目的 View (例如 TextView 和 ViewFlipper)时遇到问题。

我是否必须通过 ListView 更新某些内容，还是通过适配器更新某些内容。我尝试过类似以下的事情；

View test = (View)adapter.getView(pos, null, myListView);
ViewFlipper temp = (ViewFlipper)test.findViewById(R.id.flipholder);
temp.showNext();
TextView temp2 = (TextView)test.findViewById(R.id.filmtitle);
temp2.setText("Hello World");

这会导致 View 翻转器翻转第一个和第三个项目或第二个和第四个项目，并且文本根本不更新。

有什么想法吗？

干杯

Answer 1

在 getView 中尝试此模式:

public View getView(int position, View convertView, ViewGroup parent) {
        // A ViewHolder keeps references to children views to avoid unneccessary calls
        // to findViewById() on each row.
        ViewHolder holder;

        // When convertView is not null, we can reuse it directly, there is no need
        // to reinflate it. We only inflate a new View when the convertView supplied
        // by ListView is null.
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.list_item_icon_text, 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.text);
            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(DATA[position]);
        holder.icon.setImageBitmap((position & 1) == 1 ? mIcon1 : mIcon2);

        return convertView;
    }

    static class ViewHolder {
        TextView text;
        ImageView icon;
    }
}