NavInfoEvent not triggered in android when application is in background/minimized

[DhirajMakane]

Hi,
Navinfo event is not triggered when application is in background.

Environment details

google_navigation_flutter: ^0.3.0
Observed for android (Note iOS is working)
Flutter - 3.22.3
Location Permissions are enabled
Permissions added

Steps to reproduce

Set destination and origin.
Open Google Maps for turn-by-turn navigation
Initial self-location and the route are displayed on the map
Be in the app for a few minutes. The nav info events are received.
Now minimize the app -> The nav info events are not triggered

AndroidManifest

Flutter Code Snippet

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_LOCATION" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_TYPE_LOCATION" />

Future<void> _startNavigation() async {
   // popup for the terms and condition
   if (!await GoogleMapsNavigator.areTermsAccepted()) {
     await GoogleMapsNavigator.showTermsAndConditionsDialog(
       'Sample APP',
       'Sample APP',
     );
   }

   await GoogleMapsNavigator.initializeNavigationSession();
   await _setupListeners();

   /// Simulate location.
   await GoogleMapsNavigator.simulator.setUserLocation(widget.sourceLocation);

// add way points
   var wayPoints = <NavigationWaypoint>[
     NavigationWaypoint.withLatLngTarget(
       title: "destination title",
       target: widget.destinationLocation,
     ),
   ];
   final Destinations msg = Destinations(
       waypoints: wayPoints,
       displayOptions: NavigationDisplayOptions(showDestinationMarkers: true),
       routingOptions:
           RoutingOptions(travelMode: NavigationTravelMode.twoWheeler));

   final NavigationRouteStatus status =
       await GoogleMapsNavigator.setDestinations(msg);

   if (status == NavigationRouteStatus.statusOk) {
     await GoogleMapsNavigator.startGuidance();

     await _navigationViewController
         .followMyLocation(CameraPerspective.tilted);
   }
 }

 // set the nav info listener
 Future<void> _setupListeners() async {
   _navInfoSubscription = GoogleMapsNavigator.setNavInfoListener(
     _onNavInfoEvent,
     numNextStepsToPreview: 10,
   );
 }

 // event listened to update the logs
 void _onNavInfoEvent(
   NavInfoEvent event,
 ) {
   print("nav info event received");
 }

Thanks!

[DhirajMakane]

Hi @illuminati1911 @jokerttu Any update on this issue?

[jokerttu]

@DhirajMakane
Hi, this is still on our roadmap. We plan to provide an example of running a Flutter application with navigation in the background.

This may also require some changes to the overall channel initialization.

To communicate with native code while the Flutter app is in the background, isolates should be used.
For reference, see:
https://docs.flutter.dev/perf/isolates#using-platform-plugins-in-isolates