class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    /// Hope WillPopScope will do the job for you.
    return WillPopScope(
      onWillPop: () async => null,
      child: Scaffold(
        body: Center(
          child: Text('asd'),
        ),
      ),
    );
  }
}

更新2023年的@FederickJonathan答案，现在你必须为onWillPop参数返回一个bool值：

class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    /// Hope WillPopScope will do the job for you.
    return WillPopScope(
      onWillPop: () async => false, // update here
      child: Scaffold(
        body: Center(
          child: Text('asd'),
        ),
      ),
    );
  }
}

您也可以将其 Package 在main.dart中的MaterialApp类中，以便一次为整个应用程序工作，如下所示：

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () async => false,
      child: MaterialApp(
       ...
      ),
    );
  }
}