如何在特定索引处获取ListView的子视图 [英] How to get a ListView's child view at specific index

问题描述

我需要在特定索引处动态更改ListView的子视图的背景颜色.因此，在应用背景之前，我需要先获取视图.

I need to dynamically change the background color of a child view of a ListView at a specific index. So I need to get the view first before applying the background.

我尝试了以下方法.

getViewAt(int index)-不适用于ListView.

getChildAt(int index)-这会导致运行时NPE错误

getChildAt(int index) - this gives runtime NPE error

Google搜索返回不相关的结果.

A Google search returns irrelevant results.

请帮帮我.谢谢.

推荐答案

我知道了如何做到这一点.

I figured out how to do this.

我真的认为，对于类似于如何设置背景图像"的问题，不必发布代码和logcat.

I really think that one should not have to post code and logcat for a question that is similar to "How to set background image".

无论如何，总之，我的答案是通过适配器的getView()将位置设置为列表视图中每个孩子的标签，然后使用findViewWithTag(Object tag)获取任何孩子.

Anyway my answer is, in short, set position as tag for every child in the listview through your adapter's getView() and then get any child using findViewWithTag(Object tag).

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    convertView = (LinearLayout)inflater.inflate(R.layout.some_layout, parent, false);        .
    convertView.setTag(String.valueOf(position));
}

以及每当您需要一个特定的孩子时.

And whenever you need to get a specific child.

View v = mylistview.findViewWithTag(String.valueOf(index));

更改背景颜色.

v.setBackgroundResource(R.color.some_color);

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