如何在flutter中创建渐变颜色列表？

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Gradient Color List'),
        ),
        body: Center(
          child: Container(
            width: 200,
            height: 200,
            decoration: BoxDecoration(
              gradient: LinearGradient(
                colors: [
                  Colors.red,
                  Colors.blue,
                  Colors.green,
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}