解决Flutter使用Column等容器包裹ListView报错的问题

报错如下所示：

I/flutter ( 4625): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter ( 4625): The following assertion was thrown during performResize():
I/flutter ( 4625): Vertical viewport was given unbounded height.
I/flutter ( 4625): Viewports expand in the scrolling direction to fill their container.In this case, a vertical
I/flutter ( 4625): viewport was given an unlimited amount of vertical space in which to expand. This situation
I/flutter ( 4625): typically happens when a scrollable widget is nested inside another scrollable widget.
I/flutter ( 4625): If this widget is always nested in a scrollable widget there is no need to use a viewport because
I/flutter ( 4625): there will always be enough vertical space for the children. In this case, consider using a Column
I/flutter ( 4625): instead. Otherwise, consider using the “shrinkWrap” property (or a ShrinkWrappingViewport) to size
I/flutter ( 4625): the height of the viewport to the sum of the heights of its children.

解决方案：

使用扩展小部件包裹ListView
new Expanded(
child: new ListView(
…
)
);
这告诉ListView尽可能地获取宽度和高度。
加粗样式