我正试图在Flutter中创建自定义单选按钮，下面是用于按钮小部件的代码
<pre><code>class _CustomButtonWidget e
<a href="https://i.stack.imgur.com/oUxNk.jpg" rel="nofollow noreferrer">https://i.stack.imgur.com/oUxNk.jpg</a>
我想要这样
我有这张卡：
<pre><code>Card(
elevation: 5,
color: Colors.white,
shape: RoundedRectangleBorder(
borde
