Flutter/Dart -抛出异常时重定向屏幕的按钮？

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  void _handleException() {
    try {
      // 抛出异常的代码
      throw Exception('示例异常');
    } catch (e) {
      // 处理异常的代码
      Navigator.push(
        context,
        MaterialPageRoute(builder: (context) => ErrorScreen()),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter异常处理示例'),
      ),
      body: Center(
        child: RaisedButton(
          onPressed: _handleException,
          child: Text('抛出异常'),
        ),
      ),
    );
  }
}

class ErrorScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('错误页面'),
      ),
      body: Center(
        child: Text('发生了一个错误！'),
      ),
    );
  }
}