颤动如何填充凸起按钮的渐变颜色？

Question

我正在尝试渲染渐变按钮，但在某些设备上，渐变颜色不会像下图那样展开。

我怎样才能解决这个问题？
谢谢！

代码

class GradientButton extends StatelessWidget {
  final Widget child;
  final VoidCallback onPressed;
  const GradientButton({@required this.child, @required this.onPressed});
  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      textColor: Colors.white,
      shape: StadiumBorder(),
      padding: const EdgeInsets.all(0.0),
      child: Container(
        decoration: BoxDecoration(
          gradient: LinearGradient(
            colors: <Color>[Color(0xff00F260), Color(0xff0575E6)],
          ),
        ),
        padding: EdgeInsets.all(8.0),
        child: child
        onPressed: onPressed,
      ),
    );
  }
}

Answer 1

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';

class GradientButton extends StatelessWidget {
  final Widget child;
  final VoidCallback onPressed;

  const GradientButton({Key key, this.onPressed, this.child}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: ShapeDecoration(
        shape: const StadiumBorder(),
        gradient: LinearGradient(
          colors: [Color(0xff00F260), Color(0xff0575E6)],
        ),
      ),
      child: MaterialButton(
        materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
        shape: const StadiumBorder(),
        child: child,
        onPressed: onPressed,
      ),
    );
  }
}

您还可以获得一些MaterialButton效果，例如点击时出现波纹、当 onPressed 为空时禁用等。对于中的高程设置shadows属性ShapeDecoration

shadows: [
  BoxShadow(
      color: Colors.black54,
      spreadRadius: 0.5,
      blurRadius: 3,
      offset: Offset(1, 1))
]