RenderFlex children have non-zero flex but incoming height constraints are unbounded.

問題

• Flexible 里用了 Column, 使得高度無法確定

解決方案

• 將Flexible替換為ConstrainedBox, 並設定maxHeight

代碼

ConstrainedBox(
          constraints: BoxConstraints(maxHeight: 500,,
           child: Column(
               mainAxisSize: MainAxisSize.min,
                children: <Widget>[
                Text(object.jobsName, style: TextStyle(fontSize: 20),),
                Text("${object.companyName} | ${object.districtCn}"),
              ],
        ),
)