应用被杀时，无法导航到推送通知点击的特定屏幕(Flutter android)

应用被杀时，无法导航到推送通知点击的特定屏幕是一个在Flutter Android开发中可能遇到的问题。当应用被杀死后，推送通知点击后无法直接导航到指定的屏幕。

解决这个问题的方法是使用Flutter的本地通知插件，例如flutter_local_notifications。该插件允许应用在后台或被杀死时接收到推送通知，并且可以通过点击通知来导航到指定的屏幕。

以下是解决方案的步骤：

在Flutter项目的pubspec.yaml文件中添加flutter_local_notifications插件的依赖：

dependencies:
  flutter_local_notifications: ^5.0.0

运行flutter pub get命令来获取插件依赖。
在应用的入口文件（通常是main.dart）中初始化本地通知插件：

import 'package:flutter_local_notifications/flutter_local_notifications.dart';

FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
    FlutterLocalNotificationsPlugin();

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await initializeNotifications();
  runApp(MyApp());
}

Future<void> initializeNotifications() async {
  const AndroidInitializationSettings initializationSettingsAndroid =
      AndroidInitializationSettings('app_icon');
  final InitializationSettings initializationSettings =
      InitializationSettings(android: initializationSettingsAndroid);
  await flutterLocalNotificationsPlugin.initialize(initializationSettings);
}

在接收到推送通知的回调中，使用本地通知插件来显示通知，并设置点击通知时导航到指定屏幕：

Future<void> _onNotificationClicked(RemoteMessage message) async {
  // 解析推送通知中的数据，获取导航目标屏幕的信息
  final String screenName = message.data['screen_name'];

  // 使用本地通知插件显示通知
  const AndroidNotificationDetails androidPlatformChannelSpecifics =
      AndroidNotificationDetails(
    'your_channel_id',
    'your_channel_name',
    'your_channel_description',
    importance: Importance.max,
    priority: Priority.high,
  );
  const NotificationDetails platformChannelSpecifics =
      NotificationDetails(android: androidPlatformChannelSpecifics);
  await flutterLocalNotificationsPlugin.show(
    0,
    'Notification Title',
    'Notification Body',
    platformChannelSpecifics,
    payload: screenName, // 将导航目标屏幕的信息作为payload传递
  );
}

// 在main函数中注册通知点击的回调
void main() async {
  // ...
  FirebaseMessaging.onMessageOpenedApp.listen(_onNotificationClicked);
  // ...
}

在应用的入口文件中处理通知点击后的导航逻辑，根据payload中的信息导航到指定屏幕：

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      // ...
      initialRoute: '/',
      onGenerateRoute: (settings) {
        if (settings.name == '/') {
          return MaterialPageRoute(builder: (_) => HomeScreen());
        } else if (settings.name == '/details') {
          final String screenName = settings.arguments as String;
          return MaterialPageRoute(
            builder: (_) => DetailsScreen(screenName: screenName),
          );
        }
        return null;
      },
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Home')),
      body: Center(
        child: ElevatedButton(
          child: const Text('Go to Details'),
          onPressed: () {
            Navigator.pushNamed(context, '/details', arguments: 'details_screen');
          },
        ),
      ),
    );
  }
}

class DetailsScreen extends StatelessWidget {
  final String screenName;

  const DetailsScreen({required this.screenName});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(screenName)),
      body: Center(child: Text('Details Screen')),
    );
  }
}

通过以上步骤，当应用被杀死后，点击推送通知时将会导航到指定的屏幕。在这个例子中，推送通知点击后将导航到名为"details_screen"的屏幕。

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