避免RawMaterialButton和FlatButton的默认颜色和highlightColor之间的补间颜色

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        buttonTheme: ButtonThemeData(
          colorScheme: ColorScheme.light(
            primary: Colors.blue, // 修改按钮的默认颜色
            onPrimary: Colors.white, // 修改按钮文字的颜色
            secondary: Colors.red, // 修改按钮的highlightColor
            onSecondary: Colors.white, // 修改按钮highlightColor下的文字颜色
          ),
        ),
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Custom Button Theme'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            RawMaterialButton(
              onPressed: () {},
              child: Text('RawMaterialButton'),
            ),
            SizedBox(height: 20),
            FlatButton(
              onPressed: () {},
              child: Text('FlatButton'),
            ),
          ],
        ),
      ),
    );
  }
}