got full screen notification working, doesn't wake up the device yet, but payload is delivered and right pizza event/recipe step is fetched

lib/entities/PizzaEvent.dart

@@ -39,7 +39,8 @@ class PizzaEvent extends HiveObject{
         "PizzaEventChannel", "PizzaEventChannel", "PizzaPlanner notification channel",
         importance: Importance.max,
         priority: Priority.high,
-        ticker: "ticker"
+        ticker: "ticker",
+        fullScreenIntent: true,
     );
 
     const platformChannelSpecific = NotificationDetails(android: androidPlatformChannelSpecifics);
@@ -53,20 +54,22 @@ class PizzaEvent extends HiveObject{
     final List<PendingNotificationRequest> pendingNotificationRequests = await flutterLocalNotificationsPlugin.pendingNotificationRequests();
     int notificationId = pendingNotificationRequests.map((pendingNotification) => pendingNotification.id).fold(0, max);
 
+    int stepId = 0;
     for (var recipeStep in this.recipe.recipeSteps) {
       await flutterLocalNotificationsPlugin.zonedSchedule(
-          notificationId,
+          notificationId+stepId,
           recipeStep.name,
           null,
           stepTime,
           platformChannelSpecific,
           androidAllowWhileIdle: true,
+          payload: "${this.key}__$stepId",
           uiLocalNotificationDateInterpretation:
           UILocalNotificationDateInterpretation.absoluteTime
       );
       recipeStep.notificationId = notificationId;
       stepTime = stepTime.add(Duration(seconds: recipeStep.getCurrentWaitInSeconds()));
-      notificationId++;
+      stepId++;
     }
   }
 }

lib/main.dart

@@ -8,17 +8,22 @@ import 'package:pizzaplanner/entities/PizzaRecipe/RecipeStep.dart';
 import 'package:pizzaplanner/entities/PizzaRecipe/RecipeSubStep.dart';
 import 'package:pizzaplanner/pages/AddPizzaEventPage.dart';
 import 'package:pizzaplanner/pages/PickPizzaRecipePage.dart';
+import 'package:pizzaplanner/pages/PizzaEventNotificationPage.dart';
 import 'package:pizzaplanner/pages/PizzaEventPage.dart';
 import 'package:pizzaplanner/pages/PizzaEventsPage.dart';
 
 import 'package:hive/hive.dart';
 import 'package:hive_flutter/hive_flutter.dart';
 import 'package:pizzaplanner/util.dart';
+import 'package:rxdart/subjects.dart';
 
 import 'package:timezone/data/latest.dart' as tz;
 import 'package:timezone/timezone.dart' as tz;
 
 final flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
+final BehaviorSubject<String?> selectNotificationSubject = BehaviorSubject<String?>();
+String? selectedNotificationPayload;
+
 
 void main() async {
   // hive init
@@ -47,28 +52,51 @@ void main() async {
       iOS: initializationSettingsIOS,
       macOS: initializationSettingsMacOS
   );
-  await flutterLocalNotificationsPlugin.initialize(initializationSettings,
-      onSelectNotification: selectNotification);
+  await flutterLocalNotificationsPlugin.initialize(
+    initializationSettings,
+    onSelectNotification: (String? payload) async {
+      selectedNotificationPayload = payload;
+      selectNotificationSubject.add(payload);
+  });
 
   // init timezones properly
   tz.initializeTimeZones();
   final String? timeZoneName = await FlutterNativeTimezone.getLocalTimezone();
   tz.setLocalLocation(tz.getLocation(timeZoneName!));
 
-  runApp(PizzaPlanner());
+  runApp(
+    MaterialApp(
+      title: "PizzaPlanner",
+      home: PizzaPlanner(),
+      onGenerateRoute: RouteGenerator.generateRoute,
+    )
+  );
 
   //await Hive.close();
 }
 
-class PizzaPlanner extends StatelessWidget {
-  // This widget is the root of your application.
+class PizzaPlanner extends StatefulWidget {
+  @override
+  PizzaPlannerState createState() => PizzaPlannerState();
+}
+
+class PizzaPlannerState extends State<PizzaPlanner> {
+
+  @override
+  void initState(){
+    super.initState();
+    this._configureSelectNotificationSubject();
+  }
+
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
-      title: "PizzaPlanner",
-      home: PizzaEventsPage(),
-      onGenerateRoute: RouteGenerator.generateRoute,
-    );
+    return PizzaEventsPage();
+  }
+
+  void _configureSelectNotificationSubject() {
+    selectNotificationSubject.stream.listen((String? payload) async {
+      await Navigator.pushNamed(context, '/event/notification', arguments: payload);
+    });
   }
 }
 
@@ -87,6 +115,9 @@ class RouteGenerator {
       case "/event/view": {
         return MaterialPageRoute(builder: (context) => PizzaEventPage(settings.arguments as PizzaEvent));
       }
+      case "/event/notification": {
+        return MaterialPageRoute(builder: (context) => PizzaEventNotificationPage(settings.arguments as String?));
+      }
 
       default: {
         return MaterialPageRoute(builder: (context) => PizzaEventsPage());
@@ -95,10 +126,3 @@ class RouteGenerator {
   }
 }
 
-Future selectNotification(String? payload) async {
-  if (payload == null) {
-    print("Payload: null");
-    return;
-  }
-  print("Payload: $payload");
-}

lib/pages/PizzaEventNotificationPage.dart

@@ -0,0 +1,55 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:hive/hive.dart';
+import 'package:pizzaplanner/entities/PizzaEvent.dart';
+import 'package:pizzaplanner/entities/PizzaRecipe/RecipeStep.dart';
+
+class PizzaEventNotificationPage extends StatefulWidget {
+  final String? payload;
+
+  PizzaEventNotificationPage(this.payload);
+
+  @override
+  PizzaEventNotificationState createState() => PizzaEventNotificationState();
+}
+
+class PizzaEventNotificationState extends State<PizzaEventNotificationPage> {
+  late final PizzaEvent pizzaEvent;
+  late final RecipeStep recipeStep;
+
+  @override
+  void initState() {
+    super.initState();
+    if (this.widget.payload == null){
+      print("Redirected to notification page but no payload... Popping");
+      Navigator.pop(context);
+    }
+    var split = this.widget.payload!.split("__");
+    var pizzaEventId = int.parse(split[0]);
+    var recipeStepId = int.parse(split[1]);
+
+    var pizzaEventsBox = Hive.box<PizzaEvent>("PizzaEvents");
+
+    pizzaEvent = pizzaEventsBox.get(pizzaEventId)!;
+    recipeStep = pizzaEvent.recipe.recipeSteps[recipeStepId];
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+        appBar: AppBar(
+          title: Text("From notification"),
+        ),
+        resizeToAvoidBottomInset: false,
+        body: Container(
+            padding: EdgeInsets.fromLTRB(40, 10, 40, 10),
+            child:  Column(
+                children: <Widget>[
+                  Text(pizzaEvent.name),
+                  Text(recipeStep.name)
+                ]
+            )
+        )
+    );
+  }
+}

pubspec.yaml

@@ -38,6 +38,8 @@ dependencies:
   hive: ^2.0.4
   hive_flutter: ^1.1.0
 
+  rxdart: ^0.27.1
+
   timezone: ^0.7.0
   flutter_native_timezone: ^2.0.0
   flutter_local_notifications: ^8.0.0