flutter - 如何在布局中扩展嵌套容器？

Question

我正在尝试扩展容器布局。我尝试使用 Expanded 小部件，但仍然无法正常工作。我想扩展到最大尺寸的蓝色容器，您可以在下面的示例中看到。你有什么建议吗？或者我可以使用什么小部件来解决我的问题？

这是我的代码:

Container(
padding: EdgeInsets.all(3),
child: Column(
    crossAxisAlignment: CrossAxisAlignment.start,
    children: <Widget>[
    Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
        CircleAvatar(
            backgroundColor: Colors.brown.shade800,
            child: Text("J")),
        Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
            Text("Some text"),
            Container(
                decoration: new BoxDecoration(
                    border: new Border.all(color: Colors.blueAccent)),
                child: Text("How expand this container to max width?"))
            ],
        )
        ],
    )
    ],
));

谢谢

Answer 1

我无法解释这一点，但它只适用于两个 Expanded:

ConstrainedBox(
  constraints: BoxConstraints(maxWidth: MediaQuery.of(context).size.width),
  child: Container(
    padding: EdgeInsets.all(3),
    child: Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        Row(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            CircleAvatar(
                backgroundColor: Colors.brown.shade800, child: Text("J")),
            Expanded(
              child: Column(
                key: key,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  Text("Some text"),
                  Container(
                    decoration: new BoxDecoration(
                        border: new Border.all(color: Colors.blueAccent)),
                    child: Row(
                      children: <Widget>[
                        Expanded(
                            child: Text(
                                "How expand this container to max width?"))
                      ],
                    ),
                  ),
                ],
              ),
            )
          ],
        )
      ],
    ),
  ),
);