Question

我在我的活动中使用ListView与自定义数组适配器（它只是覆盖getView方法）进行一些聊天活动。当我打开软键盘listview大小调整（例如从5到2个可见行），但getView方法调用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

如何防止这种开销呢？请求帮助。

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;
}

在resize上冗余更新listView行

1 个答案: