调整大小时 listView 行的冗余更新

Question

我在活动中使用 ListView 和自定义数组适配器（它只是覆盖 getView 方法）来进行某些聊天活动。当我打开软键盘列表视图调整大小（例如从 5 行变为 2 行可见行）时，但 getView 方法调用了 7 次：

07-11 11:59:13.185: DEBUG/*: [ChatMessageArrayAdapter] generating view for pos:5
07-11 11:59:13.346: DEBUG/*: [ChatMessageArrayAdapter] generating view for pos:4
07-11 11:59:13.485: DEBUG/*: [ChatMessageArrayAdapter] generating view for pos:3
07-11 11:59:13.625: DEBUG/*: [ChatMessageArrayAdapter] generating view for pos:2
07-11 11:59:13.775: DEBUG/*: [ChatMessageArrayAdapter] generating view for pos:1
07-11 11:59:14.015: DEBUG/*: [ChatMessageArrayAdapter] generating view for pos:5
07-11 11:59:14.135: DEBUG/*: [ChatMessageArrayAdapter] generating view for pos:4

如何防止这种开销？
谢谢帮助。

Answer 1

AFAIK 这是 getView(); 的正常行为
您无法阻止对 getView() 的调用，但可以最大限度地减少进程开销。
你会使用类似的东西：

public View getView(final int position, View convertView, ViewGroup parent) {
    View row = null;
    if(convertView == null)
    {
        row = LayoutInflater.from(mContext).inflate(R.layout.row, null);
        //initialize and set values of components inside row for the first time.
    }
    else
    {
        row = convertView;
    }
    return row;
}