use null navigator for recreation

Author: VysotskiVadim

libnavigation-core/src/main/java/com/mapbox/navigation/core/MapboxNavigation.kt

@@ -470,15 +470,7 @@ class MapboxNavigation @VisibleForTesting internal constructor(
                 tilesVersion = navigationOptions.routingTilesOptions.tilesVersion
             ),
             navigationOptions.accessToken ?: "",
-            if (moduleRouter.isInternalImplementation()) {
-                // We pass null to let NN know that default router is used and it can rely
-                // on implementation details in some cases like offline-online switch.
-                // Meanwhile platform SDK uses its own instance of native router for
-                // route requests
-                null
-            } else {
-                RouterInterfaceAdapter(moduleRouter, ::getNavigationRoutes)
-            },
+            getRouterInterfaceForNativeNavigator()
         )
         etcGateAPI = EtcGateApi(navigator.experimental)
 
@@ -620,6 +612,18 @@ class MapboxNavigation @VisibleForTesting internal constructor(
         roadObjectMatcher = RoadObjectMatcher(navigator)
     }
 
+    private fun getRouterInterfaceForNativeNavigator(): RouterInterface? {
+        return if (moduleRouter.isInternalImplementation()) {
+            // We pass null to let NN know that default router is used and it can rely
+            // on implementation details in some cases like offline-online switch.
+            // Meanwhile platform SDK uses its own instance of native router for
+            // route requests
+            null
+        } else {
+            RouterInterfaceAdapter(moduleRouter, ::getNavigationRoutes)
+        }
+    }
+
     /**
      * Control the location events playback during a replay trip session.
      * Start a replay trip session with [startReplayTripSession].
@@ -2033,11 +2037,7 @@ class MapboxNavigation @VisibleForTesting internal constructor(
                 historyRecorderHandles.composite,
                 createTilesConfig(isFallback, tilesVersion),
                 navigationOptions.accessToken ?: "",
-                if (moduleRouter.isInternalImplementation()) {
-                    nativeRouter
-                } else {
-                    RouterInterfaceAdapter(moduleRouter, ::getNavigationRoutes)
-                },
+                getRouterInterfaceForNativeNavigator()
             )
             etcGateAPI.experimental = navigator.experimental
             assignHistoryRecorders()

libnavigator/src/main/java/com/mapbox/navigation/navigator/internal/MapboxNativeNavigator.kt

@@ -53,7 +53,7 @@ interface MapboxNativeNavigator {
         historyRecorderComposite: HistoryRecorderHandle?,
         tilesConfig: TilesConfig,
         accessToken: String,
-        router: RouterInterface,
+        router: RouterInterface?,
     )
 
     suspend fun resetRideSession()

libnavigator/src/main/java/com/mapbox/navigation/navigator/internal/MapboxNativeNavigatorImpl.kt

@@ -111,7 +111,7 @@ object MapboxNativeNavigatorImpl : MapboxNativeNavigator {
         historyRecorderComposite: HistoryRecorderHandle?,
         tilesConfig: TilesConfig,
         accessToken: String,
-        router: RouterInterface
+        router: RouterInterface?
     ) {
         val storeNavSessionState = navigator!!.storeNavigationSession()
         create(config, historyRecorderComposite, tilesConfig, accessToken, router)