[dart] Arguments of a constant creation must be constant express

Question

用flutter开发app时，想定义一些常用的样式

代码如下：

import 'package:flutter/material.dart';
class AppStyle {
  static Color colorRed = const Color(0xffe04f5f);
  static Color colorWhite = const Color(0xffffffff);
  static Color colorGreen = const Color(0xff1abc9c);
}

现在，想定义一个列表标题的样式，添加一行

  static TextStyle listRowTitle = const TextStyle(fontSize: 20.0, color: colorGreen);

如果向上面这样写，那么colorGreen这里就会出问题，错误信息是

[dart] Invalid constant value.
[dart] Arguments of a constant creation must be constant expressions.
Color colorGreen

如果，把colorGreen换成Color(0xff1abc9c)就没有问题！

static TextStyle listRowTitle = const TextStyle(fontSize: 20.0, color: Color(0xff1abc9c));

自己google了半天，也没找到答案，哪位大神可以给我解释解释啊？

Answer 1

把前面的const去掉