将两种不同的颜色设置为单个容器

I am trying to achieve a custom design dynamically from my button. I have designed this button from a Container with InkWell. But I am not getting a correct way how I can set 2 different colours to this button based on received values from my API. For reference here is the button:

在这个按钮中灰色部分是容器背景色。然后我在这个容器中添加了一个图像。现在红色应该随着从服务器接收到的高度而动态变化。 但我没有找到正确的方法。

您可以使用容器和线性渐变轻松实现这一点。将颜色作为渐变传递，并以所需的百分比定义适当的停止点。

Example:

@override
Widget build(BuildContext context) {
  final Color background = Colors.grey;
  final Color fill = Colors.redAccent;
  final List<Color> gradient = [
    background,
    background,
    fill,
    fill,
  ];
  final double fillPercent = 56.23; // fills 56.23% for container from bottom
  final double fillStop = (100 - fillPercent) / 100;
  final List<double> stops = [0.0, fillStop, fillStop, 1.0];

  return Container(
    child: Icon(Icons.forward),
    decoration: BoxDecoration(
      gradient: LinearGradient(
        colors: gradient,
        stops: stops,
        end: Alignment.bottomCenter,
        begin: Alignment.topCenter,
      ),
    ),
  );
} 

希望这可以帮助！