如何在ListTile Flutter中更改非活动/禁用标题/副标题的颜色？

dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^1.0.2
  material: ^2.0.0

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('ListTile Example')),
        body: ListView(
          children: <Widget>[
            Theme(
              data: ThemeData(
                textTheme: TextTheme(
                  subtitle1: TextStyle(color: Colors.red), // 非活动标题的颜色
                  subtitle2: TextStyle(color: Colors.blue), // 非活动副标题的颜色
                ),
              ),
              child: ListTile(
                title: Text('Title'),
                subtitle: Text('Subtitle'),
              ),
            ),
          ],
        ),
      ),
    );
  }
}