如何在Flutter中实现接受文本和URL的共享扩展？

dependencies:
  shared_preferences: ^2.0.7

import 'package:shared_preferences/shared_preferences.dart';

SharedPreferences _prefs;

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Share Extension',
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  void initState() {
    super.initState();
    // 初始化SharedPreferences实例
    SharedPreferences.getInstance().then((prefs) {
      _prefs = prefs;
      // 在这里可以获取共享的文本和URL数据
      String text = _prefs.getString('shared_text');
      String url = _prefs.getString('shared_url');
      // 处理接收到的文本和URL数据
      if (text != null) {
        // 处理文本数据
      }
      if (url != null) {
        // 处理URL数据
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Share Extension'),
      ),
      body: Center(
        child: Text('Share Extension Home'),
      ),
    );
  }
}