您可以创建自己的ThemeData子类，并覆盖相应颜色的getter，以返回原色。

class CustomThemeData extends ThemeData
{
  // Implement appropriate constructor or factory
  // ...

  // Then override getter to return the primary color
  @override
  Color get cardColor => this.primaryColor;
}

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并在运行应用程序时使用它

void main() => runApp(MaterialApp(
  theme: CustomThemeData(
    useMaterial3: true,
    textTheme: const TextTheme(titleLarge: TextStyle(color: Colors.black)),
  ),
  home: const MyHomePage(),
));

型

我发现改变文本颜色的唯一方法如下：

import 'package:flutter/material.dart';

void main() {
  var themeData = ThemeData(
    useMaterial3: true,
  );
  runApp(MaterialApp(
    theme: themeData.copyWith(
        textTheme: themeData.textTheme.copyWith(
            titleLarge: themeData.textTheme.titleLarge
                ?.copyWith(color: themeData.primaryColor))),
    home: const MyHomePage(),
  ));
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Text('ok', style: Theme.of(context).textTheme.titleLarge),
    );
  }
}

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文档：https://docs.flutter.dev/cookbook/design/themes

Theme(
  // Create a unique theme with `ThemeData`.
  data: ThemeData(
    colorScheme: ColorScheme.fromSeed(
      seedColor: Colors.pink,
    ),
  ),
);

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请记住：* 从Flutter 3.16版本开始，Material 3是Flutter的默认主题。