[Bug]: Instance not created, create with createInstance()

[tentenponce]

Is there an existing issue for this?

• I have searched the existing issues

Description of the bug

destroy() in FlutterEngine is being called in this library: https://pub.dev/packages/flutter_foreground_task when foreground service is stopped. When this happens, calling any function from GoogleMapsNavigator (example: GoogleMapsNavigator.areTermsAccepted()) returns error: Instance not created, create with createInstance().

Is this an expected scenario, if yes, then what are the possible workarounds (or better if proper solution), and if no, then what should be the fix that needs to be applied on flutter-navigation-sdk?

Flutter version

3.27.2

Package version

0.5.1

Native SDK versions

• I haven't changed the version of the native SDKs

Flutter Doctor Output

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.27.2, on macOS 15.3.1 24D70 darwin-arm64, locale en-PH)
[!] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/to/macos-android-setup for more details.
[!] Xcode - develop for iOS and macOS (Xcode 16.1)
    ! iOS 18.1 Simulator not installed; this may be necessary for iOS and macOS development.
      To download and install the platform, open Xcode, select Xcode > Settings > Components,
      and click the GET button for the required platform.

      For more information, please visit:
        https://developer.apple.com/documentation/xcode/installing-additional-simulator-runtimes
[✓] Chrome - develop for the web
[✓] Android Studio (version 2022.3)
[✓] VS Code (version 1.98.1)
[✓] Connected device (5 available)
[✓] Network resources

! Doctor found issues in 2 categories.

Steps to reproduce

1. Call FlutterEngine(context).destroy() on Android native code
2. Call any function from GoogleMapsNavigator (example: GoogleMapsNavigator.areTermsAccepted())

Expected vs Actual Behavior

SDK should work properly even if other SDK calls destroy() on FlutterEngine

Code Sample

MainActivity.kt - simply add FlutterEngine(this).destroy(), you can make this button trigger, add delay, etc

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    FlutterEngine(this).destroy()
}

then call any function from GoogleMapsNavigator

Additional Context

No response

[halid-wzfa]

I’m experiencing a similar issue. When I use a flutter_foreground_task and then open the navigation page, I get the following error:

I/flutter (22811): PlatformException(RuntimeException, java.lang.RuntimeException: Instance not created, create with createInstance(), Cause: null, Stacktrace: java.lang.RuntimeException: Instance not created, create with createInstance()
I/flutter (22811): at com.google.maps.flutter.navigation.GoogleMapsNavigationSessionManager$Companion.getInstance(GoogleMapsNavigationSessionManager.kt:97)
I/flutter (22811): at com.google.maps.flutter.navigation.GoogleMapsNavigationSessionMessageHandler.manager(GoogleMapsNavigationSessionMessageHandler.kt:25)
I/flutter (22811): at com.google.maps.flutter.navigation.GoogleMapsNavigationSessionMessageHandler.areTermsAccepted(GoogleMapsNavigationSessionMessageHandler.kt:60)
I/flutter (22811): at com.google.maps.flutter.navigation.NavigationSessionApi$Companion.setUp$lambda$12$lambda$11(messages.g.kt:5365)
I/flutter (22811): at com.google.maps.flutter.navigation.NavigationSessionApi$Companion.$r8$lambda$9cA4Pa6p87zZes8Bc51BHpKET5o(Unknown Source:0)
I/flutter (22811): at com.google.maps.flutter.navigation.NavigationSessionApi$Companion$$ExternalSyntheticLambda21.onMessage(Unknown Source:2)
I/flutter (22811): at io.flutt
I/flutter (22811): #0 NavigationSessionApi.areTermsAccepted (package:google_navigation_flutter/src/method_channel/messages.g.dart:5592:7)
I/flutter (22811):
I/flutter (22811): # 1 requestTermsAndConditionsAcceptance (package:projectapp/presentation/screens/map/map_navigation.dart:1647:11)
I/flutter (22811):

[halid-wzfa]

@tentenponce
Hello, have you found a solution for this issue?

[tentenponce]

@tentenponce Hello, have you found a solution for this issue?

@halid-wzfa not yet, but I'm looking on forking the flutter_foreground_task and removing the FlutterEngine(this).destroy(). Though I'm not sure if there will be any side effects like memory leak. Still waiting for their reply, as I've raised this issue on both libraries: Dev-hwang/flutter_foreground_task#326

[jokerttu]

I'll prioritized this issue as imporant... will take look into it in near future.

[reubendeekay]

Hi @jokerttu was this issue resolved

[reubendeekay]

Hi @tentenponce , have you found a solution for this issue?

[tentenponce]

@reubendeekay not yet, but we're looking into forking and removing the FlutterEngine.destroy from the flutter_foreground_task library that we're using. I will update here once we test that workaround.

[Fares-fa]

Hi @tentenponce , have you found a solution for this issue?

[tentenponce]

@Fares-fa we cloned the flutter_foreground_task and removed the FlutterEngine.destroy calls. It is working fine for now, but we're still observing if there's any side effects.

[adrianbuqs]

Hey @tentenponce, I recently used the flutter_foreground_task and I'm also getting this error. Have you found the solution for this?