[Bug]: No user location is available.Did you allow location permission?

[gaolengxiaoruirui]

Is there an existing issue for this?

• I have searched the existing issues

Description of the bug

app first launch problem

Flutter version

3.27.0

Package version

0.6.1

Native SDK versions

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

Flutter Doctor Output

.

Steps to reproduce

.

Expected vs Actual Behavior

.

Code Sample

flutter nav

Additional Context

No response

[jokerttu]

@gaolengxiaoruirui
Hi! Please update the issue and explain why you believe this is a bug.
The SDK itself never prints that line; it’s part of the example application, which only demonstrates how to handle permission errors.

[gaolengxiaoruirui]

@jokerttu Mobile phones have open location permissions, when I was first called GoogleMapsNavigator. SetDestinations, the SDK will return NavigationRouteStatus. LocationUnavailable, is my question above, Could you please help confirm how this exception was thrown internally? Thank you

[jokerttu]

@gaolengxiaoruirui
This package is wrapper for native Google Maps Navigation SDK's for Android and iOS and this is internal behaviour of these packages.
If the location permissions are not given or the SDK does not have fixed location when setDestinations is called you might get this error. To avoid this, you can make sure Navigation SDK has location available, for example by listening RoadSnappedLocationUpdatedEvents; or just retry after small delay.
See Note at https://github.com/googlemaps/flutter-navigation-sdk?tab=readme-ov-file#add-a-navigation-view

[gaolengxiaoruirui]

@jokerttu Thank you for your reply. I have tried some methods, such as delaying the timing, but the problem still exists. I confirm that the permission is enabled. The official native sdk demo doesn't seem to have this error either. Could you help me confirm under what circumstances NavigationRouteStatus.LocationUnavailable will be thrown

[jokerttu]

@gaolengxiaoruirui

This SDK only returns values given by the native SDK. If native SDK does not have access to the location it can return this RouteStatus.

Android:

On Android this status is given by the native navigator when setDestinations call is processed:

https://developers.google.com/maps/documentation/navigation/android-sdk/reference/com/google/android/libraries/navigation/Navigator.RouteStatus#public-static-final-navigator.routestatus-location_disabled

RouteStatus if returned from the native sdk implementetation here:

flutter-navigation-sdk/android/src/main/kotlin/com/google/maps/flutter/navigation/GoogleMapsNavigationSessionMessageHandler.kt

Line 103 in b53bbf0

callback(Result.success(Convert.convertRouteStatusToDto(it.getOrThrow())))

and converted for flutter here:

flutter-navigation-sdk/android/src/main/kotlin/com/google/maps/flutter/navigation/Convert.kt

Line 471 in b53bbf0

Navigator.RouteStatus.LOCATION_DISABLED -> RouteStatusDto.LOCATION_UNAVAILABLE

iOS:

iOS the similar process is visible here:

flutter-navigation-sdk/ios/google_navigation_flutter/Sources/google_navigation_flutter/GoogleMapsNavigationSessionManager.swift

Line 256 in b53bbf0

completion(.success(Convert.convertRouteStatus(routeStatus)))

and converted for flutter here:

flutter-navigation-sdk/ios/google_navigation_flutter/Sources/google_navigation_flutter/Convert.swift

Line 392 in b53bbf0

case .locationUnavailable: return .locationUnavailable