ListView当我FutureBuilder用 a包装时，我想在另一个小部件内部有一个小部件Column，以便有一个简单的Row. 我收到此错误：
The following assertion was thrown during performLayout():
I/flutter (13816): RenderFlex children have non-zero flex but incoming height constraints are unbounded.
I/flutter (13816): When a column is in a parent that does not provide a finite height constraint, for example, if it is
I/flutter (13816): in a vertical scrollable, it will try to shrink-wrap its children along the vertical axis. Setting a
I/flutter (13816): flex on a child (e.g. using Expanded) …