Flutter 如何从推送通知导航到BottomNavigationBar上的特定选项卡？

我想我有一个方法，包括如下设置进入通知选项卡：

class NotificationUtil {

static void subscribeToNotifications(BuildContext context, GlobalKey<ScaffoldState> scaffoldKey) async {
final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
_firebaseMessaging.configure(
  onMessage: (Map<String, dynamic> message) async {
    print("onMessage: $message");
    _showNotification(scaffoldKey, message);
  },
  onLaunch: (Map<String, dynamic> message) async {
    print("onLaunch: $message");
    await PreferenceUtil.setNotificationKey();
  },
  onResume: (Map<String, dynamic> message) async {
    print("onResume: $message");
    await PreferenceUtil.setNotificationKey();
  },
);

await _firebaseMessaging.getToken();
_firebaseMessaging.requestNotificationPermissions(
    const IosNotificationSettings(sound: true, badge: true, alert: true));
_firebaseMessaging.onIosSettingsRegistered
    .listen((IosNotificationSettings settings) {
  print("Settings registered: $settings");
});

FirebaseUser firebaseUser = await AuthUtil.getFirebaseUser();
_firebaseMessaging
    .subscribeToTopic(firebaseUser.email.replaceAll('@', '%'));
}

 static void _showNotification(GlobalKey<ScaffoldState>  scaffoldKey, Map<String, dynamic> message) {
scaffoldKey.currentState.showSnackBar(new SnackBar(
  content: new Text(message['notification']['body'] as String),
));
 }
 }

---

}

总体方法是向屏幕传递一个int，该int用于标识带底部栏的屏幕导航时要选择的选项卡位置

class MainPage extends StatefulWidget {
  final int selectedIndex;

  MainPage(this.selectedIndex);

  @override
  _MainPageState createState() => _MainPageState(selectedIndex);
}

我必须加入一种机制来跟踪当前正在处理的推送通知，因为当从推送通知打开应用程序时，处理将进入无限循环

这是一个更完整的实现，对我来说很有用

通知处理：

class NotificationUtil {
static void subscribeToNotifications(
  BuildContext context, GlobalKey<ScaffoldState> scaffoldKey) async {
final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
_firebaseMessaging.configure(
  onMessage: (Map<String, dynamic> message) async {
    print("onMessage: $message");
    _showNotification(scaffoldKey, message);
  },
  onLaunch: (Map<String, dynamic> message) async {
    print("onLaunch: $message");
    processIncomingNotification(context, message);
  },
  onResume: (Map<String, dynamic> message) async {
    print("onResume: $message");
    processIncomingNotification(context, message);
  },
);

await _firebaseMessaging.getToken();
_firebaseMessaging.requestNotificationPermissions(
    const IosNotificationSettings(sound: true, badge: true, alert: true));
_firebaseMessaging.onIosSettingsRegistered
    .listen((IosNotificationSettings settings) {
  print("Settings registered: $settings");
});

FirebaseUser firebaseUser = await AuthUtil.getFirebaseUser();
_firebaseMessaging
    .subscribeToTopic(firebaseUser.email.replaceAll('@', '%'));
}

static void processIncomingNotification(BuildContext context, Map<String, dynamic> message) async {
String incomingMessage = message["data"]["google.message_id"] as String;
String currentMessage = await PreferenceUtil.getCurrentMessage();
if (incomingMessage == currentMessage) {
  return;
}
await PreferenceUtil.setCurrentMessage(incomingMessage);
Navigator.pushReplacementNamed(context, "/notifications");
}

static void _showNotification(
  GlobalKey<ScaffoldState> scaffoldKey, Map<String, dynamic> message) {
scaffoldKey.currentState.showSnackBar(new SnackBar(
  content: new Text(message['notification']['body'] as String),
));
}
}

主页缩写：

class MainPage extends StatefulWidget {
  final int selectedIndex;

  MainPage(this.selectedIndex);

  @override
  _MainPageState createState() => _MainPageState(selectedIndex);
}

class _MainPageState extends State<MainPage> {
  GlobalKey<ScaffoldState> scaffoldKey = new GlobalKey<ScaffoldState>();
  int _selectedIndex = 0;

  final _widgetOptions = [
    PropertyListPage(),
    NotificationListPage(),
    MorePage(),
  ];

  _MainPageState(this._selectedIndex);

---

也许你可以在应用程序恢复时调用你的方法？谢谢-我尝试过这个，但是如果我有嵌套的路由，它就不起作用了。

   class MyApp extends StatelessWidget {
 @override
Widget build(BuildContext context) {
return MaterialApp(
  debugShowCheckedModeBanner: false,
  title: COMPANY_NAME,
  theme: ThemeData.light().copyWith(
      primaryColor: const Color(0xFF13172a),
      accentColor: const Color(0xFFA8C048)),
  home: HomePage(title: COMPANY_NAME),
  routes: {
    '/notifications': (context) => MainPage(1),
  }
);
}
}

class MainPage extends StatefulWidget {
  final int selectedIndex;

  MainPage(this.selectedIndex);

  @override
  _MainPageState createState() => _MainPageState(selectedIndex);
}

class _MainPageState extends State<MainPage> {
  GlobalKey<ScaffoldState> scaffoldKey = new GlobalKey<ScaffoldState>();
  int _selectedIndex = 0;

  final _widgetOptions = [
    PropertyListPage(),
    NotificationListPage(),
    MorePage(),
  ];

  _MainPageState(this._selectedIndex);