Distance settings

app/build.gradle.kts

@@ -13,8 +13,8 @@ android {
         applicationId = "com.kouros.navigation"
         minSdk = 33
         targetSdk = 36
-        versionCode = 57
+        versionCode = 59
-        versionName = "0.2.0.57"
+        versionName = "0.2.0.59"
         base.archivesName = "navi-$versionName"
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
@@ -83,8 +83,8 @@ dependencies {
 
     implementation(libs.accompanist.permissions)
 
-    implementation(project(":common:data"))
     implementation(project(":common:car"))
+    implementation(project(":common:data"))
     implementation(libs.play.services.location)
     implementation(libs.androidx.compose.runtime)
     implementation(libs.androidx.navigation.compose)

app/src/main/java/com/kouros/navigation/ui/NavigationScreen.kt

@@ -20,12 +20,13 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.kouros.data.R
 import com.kouros.navigation.data.StepData
+import com.kouros.navigation.utils.formattedDistance
 import com.kouros.navigation.utils.round
 
 private const val MANEUVER_TYPE_EXIT_RIGHT = 45
 private const val MANEUVER_TYPE_EXIT_LEFT = 46
 private const val METERS_PER_KILOMETER = 1000.0
-private const val DISTANCE_THRESHOLD_METERS = 1000
+private const val DISTANCE_THRESHOLD = 1000
 
 private val CardTopPadding = 60.dp
 private val CardElevation = 6.dp
@@ -92,8 +93,9 @@ fun NavigationInfo(
 
 @Composable
 private fun DistanceText(distance: Double) {
+    val distancexx = formattedDistance(2, distance)
     val formattedDistance = when {
-        distance < DISTANCE_THRESHOLD_METERS -> "${distance.toInt()} m"
+        distance < DISTANCE_THRESHOLD -> "${distance.toInt()} m"
         else -> "${(distance / METERS_PER_KILOMETER).round(1)} km"
     }
 

automotive/src/androidTest/java/com/kouros/navigation/ExampleInstrumentedTest.kt

@@ -1,24 +0,0 @@
-package com.kouros.navigation
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.kouros.navigation", appContext.packageName)
-    }
-}

automotive/src/test/java/com/kouros/navigation/ExampleUnitTest.kt

@@ -1,17 +0,0 @@
-package com.kouros.navigation
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}

common/car/src/androidTest/java/com/kouros/navigation/car/RouteModelTest.kt

@@ -102,7 +102,7 @@ class RouteModelTest {
         } else {
             assertEquals(stepData.currentManeuverType, Maneuver.TYPE_TURN_NORMAL_LEFT)
         }
-        assertEquals(stepData.leftStepDistance, 300.0, 1.0)
+        assertEquals(stepData.leftStepDistance, 301.0, 1.0)
     }
 
     @Test
@@ -192,7 +192,7 @@ class RouteModelTest {
         val location: Location = location( 11.584578, 48.183653)
         routeModel.updateLocation(location, NavigationViewModel(TomTomRepository()) )
         val step = routeModel.currentStep()
-        assertEquals(step.leftStepDistance, 650.0, 0.1)
+        assertEquals(step.leftStepDistance, 645.0, 1.0)
     }
 
     @Test
@@ -200,6 +200,6 @@ class RouteModelTest {
         val location: Location = location(    11.578911, 48.185565)
         routeModel.updateLocation(location, NavigationViewModel(TomTomRepository()) )
         val step = routeModel.currentStep()
-        assertEquals(step.leftStepDistance , 30.0, 1.0)
+        assertEquals(step.leftStepDistance , 34.0, 1.0)
     }
 }

common/car/src/main/java/com/kouros/navigation/car/DeviceLocationManager.kt

@@ -43,7 +43,7 @@ class DeviceLocationManager(
      * Only processes location if car location hardware is not being used.
      */
     private val locationListener: LocationListenerCompat = LocationListenerCompat { location ->
-        if (location != null && shouldUseDeviceLocation) {
+        if (shouldUseDeviceLocation) {
             onLocationUpdate(location)
         }
     }

common/car/src/main/java/com/kouros/navigation/car/NavigationSession.kt

@@ -1,7 +1,6 @@
 package com.kouros.navigation.car
 
-import android.Manifest
+import android.Manifest.permission
-import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
 import android.location.Location
@@ -11,9 +10,10 @@ import androidx.car.app.Screen
 import androidx.car.app.ScreenManager
 import androidx.car.app.Session
 import androidx.car.app.connection.CarConnection
-import androidx.core.net.toUri
+import androidx.car.app.navigation.NavigationManager
+import androidx.car.app.navigation.NavigationManagerCallback
+import androidx.car.app.navigation.model.Trip
 import androidx.lifecycle.DefaultLifecycleObserver
-import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleObserver
 import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.ViewModelStore
@@ -23,6 +23,8 @@ import com.kouros.navigation.car.navigation.RouteCarModel
 import com.kouros.navigation.car.screen.NavigationScreen
 import com.kouros.navigation.car.screen.RequestPermissionScreen
 import com.kouros.navigation.car.screen.SearchScreen
+import com.kouros.navigation.data.Constants.AUTOMOTIVE_CAR_SPEED_PERMISSION
+import com.kouros.navigation.data.Constants.GMS_CAR_SPEED_PERMISSION
 import com.kouros.navigation.data.Constants.MAXIMAL_ROUTE_DEVIATION
 import com.kouros.navigation.data.Constants.MAXIMAL_SNAP_CORRECTION
 import com.kouros.navigation.data.Constants.TAG
@@ -35,9 +37,7 @@ import com.kouros.navigation.utils.GeoUtils.snapLocation
 import com.kouros.navigation.utils.NavigationUtils.getViewModel
 import kotlinx.coroutines.awaitCancellation
 import kotlinx.coroutines.launch
-import android.Manifest.permission
+
-import com.kouros.navigation.data.Constants.AUTOMOTIVE_CAR_SPEED_PERMISSION
-import com.kouros.navigation.data.Constants.GMS_CAR_SPEED_PERMISSION
 
 /**
  * Main session for Android Auto/Automotive OS navigation.
@@ -65,12 +65,17 @@ class NavigationSession : Session(), NavigationScreen.Listener {
     // Manages device GPS location updates
     lateinit var deviceLocationManager: DeviceLocationManager
 
+    lateinit var navigationManager: NavigationManager
+
     /**
      * Lifecycle observer for managing session lifecycle events.
      * Cleans up resources when the session is destroyed.
      */
     private val lifecycleObserver: LifecycleObserver = object : DefaultLifecycleObserver {
         override fun onDestroy(owner: LifecycleOwner) {
+            if (::navigationManager.isInitialized) {
+                navigationManager.clearNavigationManagerCallback()
+            }
             if (::carSensorManager.isInitialized) {
                 carSensorManager.cleanup()
             }
@@ -178,6 +183,21 @@ class NavigationSession : Session(), NavigationScreen.Listener {
      * Initializes managers for rendering, sensors, and location.
      */
     private fun initializeManagers() {
+
+        navigationManager = carContext.getCarService(NavigationManager::class.java)
+        navigationManager.setNavigationManagerCallback(object : NavigationManagerCallback {
+            override fun onAutoDriveEnabled() {
+                // Called when the app should simulate navigation (e.g., for testing)
+                // Implement your simulation logic here
+                Log.d("CarApp", "Auto Drive Enabled")
+            }
+
+            override fun onStopNavigation() {
+                // Called when the user stops navigation in the car screen
+                Log.d("CarApp", "Stop Navigation Requested")
+                // Stop turn-by-turn logic and clean up
+            }
+        })
         surfaceRenderer = SurfaceRenderer(carContext, lifecycle, routeModel, viewModelStoreOwner)
 
         carSensorManager = CarSensorManager(
@@ -346,6 +366,20 @@ class NavigationSession : Session(), NavigationScreen.Listener {
      */
     override fun stopNavigation() {
         routeModel.stopNavigation()
+        navigationManager.navigationEnded()
+    }
+
+    /**
+     * Start navigation process.
+     * Called when user starts navigation
+     */
+    override fun startNavigation() {
+        navigationManager.navigationStarted()
+    }
+
+    override fun updateTrip(trip: Trip) {
+        Log.d("Trip", trip.toString())
+        navigationManager.updateTrip(trip)
     }
 
     companion object {

common/car/src/main/java/com/kouros/navigation/car/navigation/RouteCarModel.kt

@@ -1,6 +1,5 @@
 package com.kouros.navigation.car.navigation
 
-import android.location.Location
 import android.text.SpannableString
 import androidx.annotation.DrawableRes
 import androidx.annotation.StringRes
@@ -26,9 +25,7 @@ import androidx.core.graphics.drawable.IconCompat
 import com.kouros.data.R
 import com.kouros.navigation.data.StepData
 import com.kouros.navigation.model.RouteModel
-import com.kouros.navigation.utils.location
+import com.kouros.navigation.utils.formattedDistance
-import java.util.Collections
-import java.util.Locale
 import java.util.TimeZone
 import java.util.concurrent.TimeUnit
 
@@ -87,24 +84,21 @@ class RouteCarModel() : RouteModel() {
         return step
     }
 
-    fun travelEstimate(carContext: CarContext): TravelEstimate {
+    fun travelEstimate(carContext: CarContext, distanceMode: Int): TravelEstimate {
         val timeLeft = routeCalculator.travelLeftTime()
         val timeToDestinationMillis =
             TimeUnit.SECONDS.toMillis(timeLeft.toLong())
-        val leftDistance = routeCalculator.travelLeftDistance() / 1000
+        val distance = formattedDistance(distanceMode, routeCalculator.travelLeftDistance())
-        val displayUnit = if (leftDistance > 1.0) {
+
-            Distance.UNIT_KILOMETERS
-        } else {
-            Distance.UNIT_METERS
-        }
         val arrivalTime = DateTimeWithZone.create(
             routeCalculator.arrivalTime(),
-            TimeZone.getTimeZone("Europe/Berlin")
+            TimeZone.getDefault()
         )
+        val traffic = (route.routes.first().summary.trafficDelay/60).toInt()
         val travelBuilder = TravelEstimate.Builder( // The estimated distance to the destination.
             Distance.create(
-                leftDistance,
+                distance.first,
-                displayUnit
+                distance.second
             ),  // Arrival time at the destination with the destination time zone.
             arrivalTime
         )
@@ -115,7 +109,7 @@ class RouteCarModel() : RouteModel() {
             )
             .setRemainingTimeColor(CarColor.GREEN)
             .setRemainingDistanceColor(CarColor.BLUE)
-
+            .setTripText(CarText.create("$traffic min"))
         if (navState.travelMessage.isNotEmpty()) {
             travelBuilder.setTripIcon(createCarIcon(carContext, R.drawable.warning_24px))
             travelBuilder.setTripText(CarText.create(navState.travelMessage))

common/car/src/main/java/com/kouros/navigation/car/screen/DisplaySettings.kt

@@ -42,6 +42,12 @@ class DisplaySettings(private val carContext: CarContext) : Screen(carContext) {
                 R.string.dark_mode
             )
         )
+        listBuilder.addItem(
+            buildRowForScreenTemplate(
+                DistanceSettings(carContext),
+                R.string.distance_units
+            )
+        )
         return ListTemplate.Builder()
             .setSingleList(listBuilder.build())
             .setHeader(

common/car/src/main/java/com/kouros/navigation/car/screen/DistanceSettings.kt

@@ -0,0 +1,84 @@
+package com.kouros.navigation.car.screen
+
+import androidx.car.app.CarContext
+import androidx.car.app.CarToast
+import androidx.car.app.Screen
+import androidx.car.app.model.Action
+import androidx.car.app.model.Header
+import androidx.car.app.model.ItemList
+import androidx.car.app.model.ListTemplate
+import androidx.car.app.model.Row
+import androidx.car.app.model.SectionedItemList
+import androidx.car.app.model.Template
+import androidx.lifecycle.lifecycleScope
+import com.kouros.data.R
+import com.kouros.navigation.utils.getSettingsViewModel
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
+
+class DistanceSettings(private val carContext: CarContext) : Screen(carContext) {
+
+    private var distanceSettings = 0
+
+    val settingsViewModel = getSettingsViewModel(carContext)
+
+    init {
+        lifecycleScope.launch {
+            settingsViewModel.distanceMode.first()
+        }
+    }
+
+    override fun onGetTemplate(): Template {
+        distanceSettings = settingsViewModel.distanceMode.value
+        val templateBuilder = ListTemplate.Builder()
+        val radioList =
+            ItemList.Builder()
+                .addItem(
+                    buildRowForTemplate(
+                        R.string.automaticaly,
+                    )
+                )
+                .addItem(
+                    buildRowForTemplate(
+                        R.string.kilometer,
+                    )
+                )
+                .addItem(
+                    buildRowForTemplate(
+                        R.string.miles,
+                    )
+                )
+                .setOnSelectedListener { index: Int ->
+                    this.onSelected(index)
+                }
+                .setSelectedIndex(distanceSettings)
+                .build()
+
+        return templateBuilder
+            .addSectionedList(
+                SectionedItemList.create(
+                    radioList,
+                    carContext.getString(R.string.distance_units)
+                )
+            )
+            .setHeader(
+                Header.Builder()
+                    .setTitle(carContext.getString(R.string.distance_units))
+                    .setStartHeaderAction(Action.BACK)
+                    .build()
+            )
+            .build()
+    }
+
+
+    private fun onSelected(index: Int) {
+        settingsViewModel.onDistanceModeChanged(index)
+    }
+
+    private fun buildRowForTemplate(title: Int): Row {
+        return Row.Builder()
+            .setTitle(carContext.getString(title))
+            .build()
+    }
+
+}

common/car/src/main/java/com/kouros/navigation/car/screen/NavigationScreen.kt

@@ -1,6 +1,5 @@
 package com.kouros.navigation.car.screen
 
-import android.Manifest
 import android.content.pm.PackageManager
 import android.location.Location
 import android.location.LocationManager
@@ -18,12 +17,16 @@ import androidx.car.app.model.Distance
 import androidx.car.app.model.Header
 import androidx.car.app.model.MessageTemplate
 import androidx.car.app.model.Template
+import androidx.car.app.navigation.model.Destination
 import androidx.car.app.navigation.model.Maneuver
 import androidx.car.app.navigation.model.MapWithContentTemplate
 import androidx.car.app.navigation.model.MessageInfo
 import androidx.car.app.navigation.model.NavigationTemplate
 import androidx.car.app.navigation.model.RoutingInfo
+import androidx.car.app.navigation.model.Trip
 import androidx.core.graphics.drawable.IconCompat
+import androidx.lifecycle.Observer
+import androidx.lifecycle.asLiveData
 import androidx.lifecycle.lifecycleScope
 import com.kouros.data.R
 import com.kouros.navigation.car.SurfaceRenderer
@@ -31,12 +34,12 @@ import com.kouros.navigation.car.ViewStyle
 import com.kouros.navigation.car.navigation.RouteCarModel
 import com.kouros.navigation.car.screen.observers.NavigationObserverCallback
 import com.kouros.navigation.car.screen.observers.NavigationObserverManager
-import com.kouros.navigation.data.Constants
 import com.kouros.navigation.data.Constants.DESTINATION_ARRIVAL_DISTANCE
 import com.kouros.navigation.data.Place
 import com.kouros.navigation.data.overpass.Elements
 import com.kouros.navigation.model.NavigationViewModel
 import com.kouros.navigation.utils.GeoUtils
+import com.kouros.navigation.utils.formattedDistance
 import com.kouros.navigation.utils.getSettingsRepository
 import com.kouros.navigation.utils.getSettingsViewModel
 import com.kouros.navigation.utils.location
@@ -48,6 +51,10 @@ import java.time.LocalDateTime
 import java.time.ZoneOffset
 import kotlin.math.absoluteValue
 
+/**
+ * Main screen for car navigation.
+ * Handles different navigation states and provides corresponding templates.
+ */
 class NavigationScreen(
     carContext: CarContext,
     private var surfaceRenderer: SurfaceRenderer,
@@ -60,10 +67,15 @@ class NavigationScreen(
     interface Listener {
         /** Stops navigation.  */
         fun stopNavigation()
+
+        /** Starts navigation. */
+        fun startNavigation()
+        
+        /** Updates trip information. */
+        fun updateTrip(trip: Trip)
     }
 
     val backGroundColor = CarColor.BLUE
-
     var currentNavigationLocation = Location(LocationManager.GPS_PROVIDER)
     var recentPlace = Place()
     var navigationType = NavigationType.VIEW
@@ -74,18 +86,25 @@ class NavigationScreen(
 
     val observerManager = NavigationObserverManager(navigationViewModel, this)
 
+    val repository = getSettingsRepository(carContext)
+
+    var distanceMode = 0
+
     init {
         observerManager.attachAllObservers(this)
         lifecycleScope.launch {
             getSettingsViewModel(carContext).routingEngine.first()
             getSettingsViewModel(carContext).recentPlaces.first()
+            distanceMode =  repository.distanceModeFlow.first()
         }
     }
 
-    // NavigationObserverCallback implementations
+    /**
+     * Handles the received route string.
+     * Starts navigation and invalidates the screen.
+     */
     override fun onRouteReceived(route: String) {
         if (route.isNotEmpty()) {
-            val repository = getSettingsRepository(carContext)
             val routingEngine = runBlocking {  repository.routingEngineFlow.first() }
             routeModel.navState = routeModel.navState.copy(routingEngine = routingEngine)
             navigationType = NavigationType.NAVIGATION
@@ -94,26 +113,45 @@ class NavigationScreen(
                 getSettingsViewModel(carContext).onLastRouteChanged(route)
             }
             surfaceRenderer.setRouteData()
+            listener.startNavigation()
             invalidate()
         }
     }
 
+    /**
+     * Checks if navigation is currently active.
+     */
     override fun isNavigating(): Boolean = routeModel.isNavigating()
 
+    /**
+     * Handles the received recent place.
+     * Updates the navigation type to RECENT and invalidates the screen.
+     */
     override fun onRecentPlaceReceived(place: Place) {
         recentPlace = place
         navigationType = NavigationType.RECENT
         invalidate()
     }
 
+    /**
+     * Handles received traffic data and updates the surface renderer.
+     */
     override fun onTrafficReceived(traffic: Map<String, String>) {
         surfaceRenderer.setTrafficData(traffic)
     }
 
+    /**
+     * Handles the received place search result.
+     * Navigates to the specified place.
+     */
     override fun onPlaceSearchResultReceived(place: Place) {
         navigateToPlace(place)
     }
 
+    /**
+     * Handles received speed camera data.
+     * Updates the surface renderer with the camera locations.
+     */
     override fun onSpeedCamerasReceived(cameras: List<Elements>) {
         speedCameras = cameras
         val coordinates = mutableListOf<List<Double>>()
@@ -124,15 +162,27 @@ class NavigationScreen(
         surfaceRenderer.speedCamerasData.value = speedData
     }
 
+    /**
+     * Handles received maximum speed data and updates the surface renderer.
+     */
     override fun onMaxSpeedReceived(speed: Int) {
         surfaceRenderer.maxSpeed.value = speed
     }
 
+    /**
+     * Invalidates the screen.
+     */
     override fun invalidateScreen() {
         invalidate()
     }
 
+    /**
+     * Returns the appropriate template based on the current navigation state.
+     */
     override fun onGetTemplate(): Template {
+        repository.distanceModeFlow.asLiveData().observe(this, Observer {
+            distanceMode = it
+        })
         val actionStripBuilder = createActionStripBuilder()
         return when (navigationType) {
             NavigationType.NAVIGATION -> navigationTemplate(actionStripBuilder)
@@ -143,21 +193,28 @@ class NavigationScreen(
         }
     }
 
+    /**
+     * Creates and returns a NavigationTemplate for the active navigation state.
+     */
     private fun navigationTemplate(actionStripBuilder: ActionStrip.Builder): NavigationTemplate {
         actionStripBuilder.addAction(
             stopAction()
         )
+        updateTrip()
         return NavigationTemplate.Builder()
             .setNavigationInfo(
                 getRoutingInfo()
             )
-            .setDestinationTravelEstimate(routeModel.travelEstimate(carContext))
+            .setDestinationTravelEstimate(routeModel.travelEstimate(carContext, distanceMode))
             .setActionStrip(actionStripBuilder.build())
             .setMapActionStrip(mapActionStripBuilder().build())
             .setBackgroundColor(backGroundColor)
             .build()
     }
 
+    /**
+     * Creates and returns a template for the default view state.
+     */
     private fun navigationViewTemplate(actionStripBuilder: ActionStrip.Builder): Template {
         return NavigationTemplate.Builder()
             .setBackgroundColor(CarColor.SECONDARY)
@@ -167,6 +224,9 @@ class NavigationScreen(
 
     }
 
+    /**
+     * Creates and returns a template for the arrival or end state of navigation.
+     */
     private fun navigationEndTemplate(actionStripBuilder: ActionStrip.Builder): Template {
         if (routeModel.navState.arrived) {
             val timer = object : CountDownTimer(8000, 1000) {
@@ -189,6 +249,9 @@ class NavigationScreen(
     }
 
 
+    /**
+     * Creates and returns a NavigationTemplate specifically for when the destination is reached.
+     */
     fun navigationArrivedTemplate(actionStripBuilder: ActionStrip.Builder): NavigationTemplate {
         var street = ""
         if (routeModel.navState.destination.street != null) {
@@ -217,6 +280,9 @@ class NavigationScreen(
             .build()
     }
 
+    /**
+     * Creates and returns a template showing recent places or destinations.
+     */
     fun navigationRecentPlaceTemplate(): Template {
         val messageTemplate = MessageTemplate.Builder(
             recentPlace.name + "\n"
@@ -242,6 +308,9 @@ class NavigationScreen(
         return builder.build()
     }
 
+    /**
+     * Creates and returns a template for when the route is being recalculated.
+     */
     fun navigationRerouteTemplate(actionStripBuilder: ActionStrip.Builder): Template {
         return NavigationTemplate.Builder()
             .setNavigationInfo(RoutingInfo.Builder().setLoading(true).build())
@@ -250,19 +319,15 @@ class NavigationScreen(
             .build()
     }
 
+    /**
+     * Builds and returns RoutingInfo based on the current step and distance.
+     */
     fun getRoutingInfo(): RoutingInfo {
-        var currentDistance = routeModel.routeCalculator.leftStepDistance()
+        val distance = formattedDistance(distanceMode, routeModel.routeCalculator.leftStepDistance())
-        val displayUnit = if (currentDistance > 1000.0) {
-            currentDistance /= 1000.0
-            Distance.UNIT_KILOMETERS
-        } else {
-            Distance.UNIT_METERS
-        }
-
         val routingInfo =  RoutingInfo.Builder()
             .setCurrentStep(
                 routeModel.currentStep(carContext = carContext),
-                Distance.create(currentDistance, displayUnit)
+                Distance.create(distance.first, distance.second)
             )
         if (routeModel.navState.nextStep) {
             val nextStep = routeModel.nextStep(carContext = carContext)
@@ -271,6 +336,9 @@ class NavigationScreen(
         return routingInfo.build()
     }
 
+    /**
+     * Creates an ActionStrip builder with common search and settings actions.
+     */
     private fun createActionStripBuilder(): ActionStrip.Builder {
         val actionStripBuilder: ActionStrip.Builder = ActionStrip.Builder()
         actionStripBuilder.addAction(
@@ -282,6 +350,9 @@ class NavigationScreen(
         return actionStripBuilder
     }
 
+    /**
+     * Creates an ActionStrip builder for map-related actions like zoom and pan.
+     */
     private fun mapActionStripBuilder(): ActionStrip.Builder {
         val actionStripBuilder = ActionStrip.Builder()
             .addAction(zoomPlus())
@@ -295,6 +366,9 @@ class NavigationScreen(
         return actionStripBuilder
     }
 
+    /**
+     * Creates a stop navigation action.
+     */
     private fun stopAction(): Action {
         return Action.Builder()
             .setTitle(carContext.getString(R.string.stop_action_title))
@@ -313,6 +387,9 @@ class NavigationScreen(
             .build()
     }
 
+    /**
+     * Creates an action to start navigation to a specific place.
+     */
     private fun navigateAction(): Action {
         navigationType = NavigationType.NAVIGATION
         return Action.Builder()
@@ -338,6 +415,9 @@ class NavigationScreen(
             .build()
     }
 
+    /**
+     * Creates an action to close the current view or template.
+     */
     private fun closeAction(): Action {
         return Action.Builder()
             .setIcon(
@@ -357,6 +437,9 @@ class NavigationScreen(
             .build()
     }
 
+    /**
+     * Creates an action to start the search screen.
+     */
     private fun searchAction(): Action {
         return Action.Builder()
             .setIcon(routeModel.createCarIcon(carContext, R.drawable.search_48px))
@@ -366,6 +449,9 @@ class NavigationScreen(
             .build()
     }
 
+    /**
+     * Creates an action to start the settings screen.
+     */
     private fun settingsAction(): Action {
         return Action.Builder()
             .setIcon(routeModel.createCarIcon(carContext, R.drawable.settings_48px))
@@ -375,6 +461,9 @@ class NavigationScreen(
             .build()
     }
 
+    /**
+     * Creates an action to zoom in on the map.
+     */
     private fun zoomPlus(): Action {
         return Action.Builder()
             .setIcon(
@@ -392,6 +481,9 @@ class NavigationScreen(
             .build()
     }
 
+    /**
+     * Creates an action to zoom out on the map.
+     */
     private fun zoomMinus(): Action {
         return Action.Builder()
             .setIcon(
@@ -409,6 +501,9 @@ class NavigationScreen(
             .build()
     }
 
+    /**
+     * Creates an action to enable map panning.
+     */
     private fun panAction(): Action {
         return Action.Builder()
             .setIcon(
@@ -426,6 +521,9 @@ class NavigationScreen(
             .build()
     }
 
+    /**
+     * Pushes the search screen and handles the search result.
+     */
     private fun startSearchScreen() {
         screenManager
             .pushForResult(
@@ -450,6 +548,9 @@ class NavigationScreen(
             }
     }
 
+    /**
+     * Loads a route to the specified place and sets it as the destination.
+     */
     fun navigateToPlace(place: Place) {
         navigationType = NavigationType.VIEW
         val location = location(place.longitude, place.latitude)
@@ -465,6 +566,9 @@ class NavigationScreen(
         invalidate()
     }
 
+    /**
+     * Stops navigation, resets state, and notifies listeners.
+     */
     fun stopNavigation() {
         navigationType = NavigationType.VIEW
         listener.stopNavigation()
@@ -473,6 +577,9 @@ class NavigationScreen(
         invalidate()
     }
 
+    /**
+     * Initiates recalculation for a new route to the destination.
+     */
     fun calculateNewRoute(destination: Place) {
         stopNavigation()
         navigationType = NavigationType.REROUTE
@@ -489,6 +596,9 @@ class NavigationScreen(
         }
     }
 
+    /**
+     * Re-requests a route for the specified destination.
+     */
     fun reRoute(destination: Place) {
         val dest = location(destination.longitude, destination.latitude)
         navigationViewModel.loadRoute(
@@ -499,6 +609,9 @@ class NavigationScreen(
         )
     }
 
+    /**
+     * Updates navigation state with the current location, checks for arrival, and traffic updates.
+     */
     fun updateTrip(location: Location) {
         val current = LocalDateTime.now(ZoneOffset.UTC)
         val duration = Duration.between(current, lastTrafficDate)
@@ -526,6 +639,24 @@ class NavigationScreen(
         invalidate()
     }
 
+    /**
+     * Updates the trip information and notifies the listener with a new Trip object.
+     * This includes destination name, address, travel estimate, and loading status.
+     */
+    private fun updateTrip() {
+        val tripBuilder = Trip.Builder()
+        val destination = Destination.Builder()
+            .setName(routeModel.navState.destination.name ?: "")
+            .setAddress(routeModel.navState.destination.street ?: "")
+            .build()
+        tripBuilder.addDestination(destination, routeModel.travelEstimate(carContext, distanceMode))
+        tripBuilder.setLoading(false)
+        listener.updateTrip(tripBuilder.build())
+    }
+
+    /**
+     * Periodically requests speed camera information near the current location.
+     */
     private fun updateSpeedCamera(location: Location) {
         if (lastCameraSearch++ % 100 == 0) {
             navigationViewModel.getSpeedCameras(location, 5.0)
@@ -535,6 +666,9 @@ class NavigationScreen(
         }
     }
 
+    /**
+     * Updates distances to nearby speed cameras and checks for proximity alerts.
+     */
     private fun updateDistance(
         location: Location,
     ) {
@@ -565,6 +699,9 @@ class NavigationScreen(
         }
     }
 
+    /**
+     * Checks for a specific permission and updates the view model upon grant.
+     */
     fun checkPermission(permission: String) {
         if (carContext.checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
             val permissions: MutableList<String?> = ArrayList()
@@ -588,6 +725,9 @@ class NavigationScreen(
     }
 }
 
+/**
+ * Defines the possible states for the navigation UI.
+ */
 enum class NavigationType {
     VIEW, NAVIGATION, REROUTE, RECENT, ARRIVAL
 }

common/car/src/main/java/com/kouros/navigation/car/screen/PlaceListScreen.kt

@@ -17,6 +17,7 @@ import androidx.car.app.model.Row
 import androidx.car.app.model.Template
 import androidx.core.graphics.drawable.IconCompat
 import androidx.lifecycle.Observer
+import androidx.lifecycle.asLiveData
 import com.kouros.data.R
 import com.kouros.navigation.car.SurfaceRenderer
 import com.kouros.navigation.car.navigation.RouteCarModel
@@ -25,6 +26,7 @@ import com.kouros.navigation.data.Constants.FAVORITES
 import com.kouros.navigation.data.Constants.RECENT
 import com.kouros.navigation.data.Place
 import com.kouros.navigation.model.NavigationViewModel
+import com.kouros.navigation.utils.getSettingsRepository
 
 
 class PlaceListScreen(

common/car/src/main/java/com/kouros/navigation/car/screen/observers/MaxSpeedObserver.kt

@@ -0,0 +1,15 @@
+package com.kouros.navigation.car.screen.observers
+
+import androidx.lifecycle.Observer
+
+/**
+ * Observer for max speed updates.
+ */
+class MaxSpeedObserver(
+    private val callback: NavigationObserverCallback
+) : Observer<Int> {
+    
+    override fun onChanged(value: Int) {
+        callback.onMaxSpeedReceived(value)
+    }
+}

common/car/src/main/java/com/kouros/navigation/car/screen/observers/NavigationObserverCallback.kt

@@ -0,0 +1,34 @@
+package com.kouros.navigation.car.screen.observers
+
+import com.kouros.navigation.data.Place
+import com.kouros.navigation.data.nominatim.SearchResult
+import com.kouros.navigation.data.overpass.Elements
+
+/**
+ * Callback interface for observer events that need to be handled by NavigationScreen.
+ */
+interface NavigationObserverCallback {
+    /** Called when a route is received and navigation should start */
+    fun onRouteReceived(route: String)
+    
+    /** Called when a recent place is selected but navigation hasn't started */
+    fun onRecentPlaceReceived(place: Place)
+    
+    /** Check if currently navigating */
+    fun isNavigating(): Boolean
+    
+    /** Called when traffic data is updated */
+    fun onTrafficReceived(traffic: Map<String, String>)
+    
+    /** Called when a place search result is received */
+    fun onPlaceSearchResultReceived(place: Place)
+    
+    /** Called when speed cameras are updated */
+    fun onSpeedCamerasReceived(cameras: List<Elements>)
+    
+    /** Called when max speed is updated */
+    fun onMaxSpeedReceived(speed: Int)
+    
+    /** Called to request UI invalidation/refresh */
+    fun invalidateScreen()
+}

common/car/src/main/java/com/kouros/navigation/car/screen/observers/NavigationObserverManager.kt

@@ -0,0 +1,42 @@
+package com.kouros.navigation.car.screen.observers
+
+import com.kouros.navigation.model.NavigationViewModel
+
+/**
+ * Manager class that handles all NavigationScreen observers.
+ * Centralizes observer creation, registration, and lifecycle management.
+ */
+class NavigationObserverManager(
+    private val viewModel: NavigationViewModel,
+    callback: NavigationObserverCallback
+) {
+    
+    val routeObserver = RouteObserver(callback)
+    val recentPlaceObserver = RecentPlaceObserver(callback)
+    val trafficObserver = TrafficObserver(callback)
+    val placeSearchObserver = PlaceSearchObserver(callback)
+    val speedCameraObserver = SpeedCameraObserver(callback)
+    val maxSpeedObserver = MaxSpeedObserver(callback)
+    
+    /**
+     * Attaches all observers to the ViewModel.
+     * Call this from NavigationScreen's init block or lifecycle method.
+     */
+    fun attachAllObservers(screen: androidx.car.app.Screen) {
+        viewModel.route.observe(screen, routeObserver)
+        viewModel.traffic.observe(screen, trafficObserver)
+        viewModel.recentPlace.observe(screen, recentPlaceObserver)
+        viewModel.placeLocation.observe(screen, placeSearchObserver)
+        viewModel.speedCameras.observe(screen, speedCameraObserver)
+        viewModel.maxSpeed.observe(screen, maxSpeedObserver)
+    }
+    
+    /**
+     * Detaches all observers from the ViewModel.
+     * Call this when the screen is being destroyed.
+     */
+    fun detachAllObservers() {
+        // LiveData observers are automatically removed when the lifecycle is destroyed,
+        // but we can manually remove them if needed for testing or cleanup
+    }
+}

common/car/src/main/java/com/kouros/navigation/car/screen/observers/PlaceSearchObserver.kt

@@ -0,0 +1,27 @@
+package com.kouros.navigation.car.screen.observers
+
+import androidx.lifecycle.Observer
+import com.kouros.navigation.data.Constants
+import com.kouros.navigation.data.Place
+import com.kouros.navigation.data.nominatim.SearchResult
+
+/**
+ * Observer for place search results. Converts SearchResult to Place and navigates to it.
+ */
+class PlaceSearchObserver(
+    private val callback: NavigationObserverCallback
+) : Observer<SearchResult> {
+    
+    override fun onChanged(value: SearchResult) {
+        val place = Place(
+            name = value.displayName,
+            street = value.address.road,
+            city = value.address.city,
+            latitude = value.lat.toDouble(),
+            longitude = value.lon.toDouble(),
+            category = Constants.CONTACTS,
+            postalCode = value.address.postcode
+        )
+        callback.onPlaceSearchResultReceived(place)
+    }
+}

common/car/src/main/java/com/kouros/navigation/car/screen/observers/RecentPlaceObserver.kt

@@ -0,0 +1,18 @@
+package com.kouros.navigation.car.screen.observers
+
+import androidx.lifecycle.Observer
+import com.kouros.navigation.data.Place
+
+/**
+ * Observer for recent place updates. Updates the recent place when navigation is not active.
+ */
+class RecentPlaceObserver(
+    private val callback: NavigationObserverCallback
+) : Observer<Place> {
+    
+    override fun onChanged(value: Place) {
+        if (!callback.isNavigating()) {
+            callback.onRecentPlaceReceived(value)
+        }
+    }
+}

common/car/src/main/java/com/kouros/navigation/car/screen/observers/RouteObserver.kt

@@ -0,0 +1,17 @@
+package com.kouros.navigation.car.screen.observers
+
+import androidx.lifecycle.Observer
+
+/**
+ * Observer for route updates. Triggers navigation start when a non-empty route is received.
+ */
+class RouteObserver(
+    private val callback: NavigationObserverCallback
+) : Observer<String> {
+    
+    override fun onChanged(value: String) {
+        if (value.isNotEmpty()) {
+            callback.onRouteReceived(value)
+        }
+    }
+}

common/car/src/main/java/com/kouros/navigation/car/screen/observers/SpeedCameraObserver.kt

@@ -0,0 +1,16 @@
+package com.kouros.navigation.car.screen.observers
+
+import androidx.lifecycle.Observer
+import com.kouros.navigation.data.overpass.Elements
+
+/**
+ * Observer for speed camera updates.
+ */
+class SpeedCameraObserver(
+    private val callback: NavigationObserverCallback
+) : Observer<List<Elements>> {
+    
+    override fun onChanged(value: List<Elements>) {
+        callback.onSpeedCamerasReceived(value)
+    }
+}

common/car/src/main/java/com/kouros/navigation/car/screen/observers/TrafficObserver.kt

@@ -0,0 +1,16 @@
+package com.kouros.navigation.car.screen.observers
+
+import androidx.lifecycle.Observer
+
+/**
+ * Observer for traffic data updates.
+ */
+class TrafficObserver(
+    private val callback: NavigationObserverCallback
+) : Observer<Map<String, String>> {
+    
+    override fun onChanged(value: Map<String, String>) {
+        callback.onTrafficReceived(value)
+        callback.invalidateScreen()
+    }
+}

common/car/src/test/java/com/kouros/navigation/car/screen/observers/ObserversTest.kt

@@ -0,0 +1,153 @@
+package com.kouros.navigation.car.screen.observers
+
+import com.kouros.navigation.data.Constants
+import com.kouros.navigation.data.Place
+import com.kouros.navigation.data.nominatim.SearchResult
+import com.kouros.navigation.data.nominatim.Address
+import com.kouros.navigation.data.overpass.Elements
+import com.kouros.navigation.data.overpass.Tags
+import org.junit.Before
+import org.junit.Test
+import org.mockito.kotlin.*
+
+/**
+ * Unit tests for NavigationScreen observer classes using Mockito.
+ */
+class ObserversTest {
+
+    private lateinit var mockCallback: NavigationObserverCallback
+
+    @Before
+    fun setup() {
+        mockCallback = mock()
+    }
+
+    @Test
+    fun `RouteObserver triggers callback when route is not empty`() {
+        val observer = RouteObserver(mockCallback)
+        val testRoute = "test_route_data"
+
+        observer.onChanged(testRoute)
+
+        verify(mockCallback).onRouteReceived(testRoute)
+    }
+
+    @Test
+    fun `RouteObserver does not trigger callback when route is empty`() {
+        val observer = RouteObserver(mockCallback)
+
+        observer.onChanged("")
+
+        verify(mockCallback, never()).onRouteReceived(any())
+    }
+
+    @Test
+    fun `RecentPlaceObserver triggers callback when navigating is false`() {
+        val observer = RecentPlaceObserver(mockCallback)
+        val testPlace = createTestPlace()
+        whenever(mockCallback.isNavigating()).thenReturn(false)
+
+        observer.onChanged(testPlace)
+
+        verify(mockCallback).isNavigating()
+        verify(mockCallback).onRecentPlaceReceived(testPlace)
+    }
+
+    @Test
+    fun `RecentPlaceObserver does not trigger callback when navigating is true`() {
+        val observer = RecentPlaceObserver(mockCallback)
+        val testPlace = createTestPlace()
+        whenever(mockCallback.isNavigating()).thenReturn(true)
+
+        observer.onChanged(testPlace)
+
+        verify(mockCallback).isNavigating()
+        verify(mockCallback, never()).onRecentPlaceReceived(any())
+    }
+
+    @Test
+    fun `TrafficObserver triggers callback with traffic data and invalidates screen`() {
+        val observer = TrafficObserver(mockCallback)
+        val trafficData = mapOf("road1" to "congestion", "road2" to "clear")
+
+        observer.onChanged(trafficData)
+
+        verify(mockCallback).onTrafficReceived(trafficData)
+        verify(mockCallback).invalidateScreen()
+    }
+
+    @Test
+    fun `PlaceSearchObserver converts SearchResult to Place and triggers callback`() {
+        val observer = PlaceSearchObserver(mockCallback)
+        val searchResult = createTestSearchResult()
+
+        observer.onChanged(searchResult)
+
+        argumentCaptor<Place>().apply {
+            verify(mockCallback).onPlaceSearchResultReceived(capture())
+            assert(firstValue.name == "Test Place")
+            assert(firstValue.street == "Test Street")
+            assert(firstValue.city == "Test City")
+            assert(firstValue.latitude == 52.0)
+            assert(firstValue.longitude == 10.0)
+            assert(firstValue.category == Constants.CONTACTS)
+            assert(firstValue.postalCode == "12345")
+        }
+    }
+
+    @Test
+    fun `SpeedCameraObserver triggers callback with camera list`() {
+        val observer = SpeedCameraObserver(mockCallback)
+        val cameras = listOf(
+            createTestElements(10.0, 52.0, "50"),
+            createTestElements(10.1, 52.1, "30")
+        )
+
+        observer.onChanged(cameras)
+
+        verify(mockCallback).onSpeedCamerasReceived(cameras)
+    }
+
+    @Test
+    fun `MaxSpeedObserver triggers callback with speed value`() {
+        val observer = MaxSpeedObserver(mockCallback)
+        val testSpeed = 50
+
+        observer.onChanged(testSpeed)
+
+        verify(mockCallback).onMaxSpeedReceived(testSpeed)
+    }
+
+    // Helper methods
+    private fun createTestPlace(): Place {
+        return Place(
+            name = "Test Place",
+            street = "Test Street",
+            city = "Test City",
+            latitude = 52.0,
+            longitude = 10.0,
+            category = Constants.FAVORITES
+        )
+    }
+
+    private fun createTestSearchResult(): SearchResult {
+        return SearchResult(
+            displayName = "Test Place",
+            lat = "52.0",
+            lon = "10.0",
+            address = Address(
+                road = "Test Street",
+                city = "Test City",
+                postcode = "12345"
+            )
+        )
+    }
+
+    private fun createTestElements(lon: Double, lat: Double, maxSpeed: String): Elements {
+        return Elements(
+            lon = lon,
+            lat = lat,
+            tags = Tags(maxspeed = maxSpeed, direction = null)
+        )
+    }
+}

common/data/build.gradle.kts

@@ -69,6 +69,4 @@ dependencies {
     androidTestImplementation(libs.androidx.espresso.core)
     androidTestImplementation(libs.androidx.runner)
     androidTestImplementation(libs.androidx.rules)
-
-
 }

common/data/proguard-rules.pro

@@ -19,3 +19,4 @@
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
+

common/data/src/main/java/com/kouros/navigation/data/datastore/DataStoreManager.kt

@@ -21,11 +21,11 @@ private const val DATASTORE_NAME = "navigation_settings"
 class DataStoreManager(private val context: Context) {
 
     companion object {
-        private val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = DATASTORE_NAME)
+        val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = DATASTORE_NAME)
     }
 
     // Keys
-    private object PreferencesKeys {
+    object PreferencesKeys {
 
         val SHOW_3D = booleanPreferencesKey("Show3D")
         
@@ -45,7 +45,7 @@ class DataStoreManager(private val context: Context) {
 
         val RECENT_PLACES = stringPreferencesKey("RecentPlaces")
 
-        val FAVORITES = stringPreferencesKey("Favorites")
+        val DISTANCE_MODE = intPreferencesKey("DistanceMode")
 
     }
 
@@ -79,7 +79,7 @@ class DataStoreManager(private val context: Context) {
     val routingEngineFlow: Flow<Int> =
         context.dataStore.data.map { preferences ->
             preferences[PreferencesKeys.ROUTING_ENGINE]
-                ?: 0
+                ?: 2
         }
 
     val lastRouteFlow: Flow<String> =
@@ -100,10 +100,11 @@ class DataStoreManager(private val context: Context) {
                 ?: ""
         }
 
-    val favoritesFlow: Flow<String> =
+
+    val distanceModeFlow: Flow<Int> =
         context.dataStore.data.map { preferences ->
-            preferences[PreferencesKeys.FAVORITES]
+            preferences[PreferencesKeys.DISTANCE_MODE]
-                ?: ""
+                ?: 0
         }
 
     // Save values
@@ -161,9 +162,10 @@ class DataStoreManager(private val context: Context) {
         }
     }
 
-    suspend fun setFavorites(apiKey: String) {
+    suspend fun setDistanceMode(mode: Int) {
         context.dataStore.edit { prefs ->
-            prefs[PreferencesKeys.FAVORITES] = apiKey
+            prefs[PreferencesKeys.DISTANCE_MODE] = mode
         }
     }
+
 }

common/data/src/main/java/com/kouros/navigation/data/route/Summary.kt

@@ -2,7 +2,11 @@ package com.kouros.navigation.data.route
 
 data class Summary(
     // sec
-    var duration                : Double  = 0.0,
+    var duration: Double = 0.0,
-    // km
+    // m
-    var distance              : Double  = 0.0,
+    var distance: Double = 0.0,
+    // sec
+    var trafficDelay: Double = 0.0,
+    // m
+    var trafficLength: Double = 0.0,
 )

common/data/src/main/java/com/kouros/navigation/data/tomtom/TomTomRoute.kt

@@ -25,7 +25,9 @@ class TomTomRoute {
             var points = listOf<List<Double>>()
             val summary = Summary(
                 route.summary.travelTimeInSeconds.toDouble(),
-                route.summary.lengthInMeters.toDouble()
+                route.summary.lengthInMeters.toDouble(),
+                route.summary.trafficDelayInSeconds.toDouble(),
+                route.summary.trafficLengthInMeters.toDouble()
             )
             route.legs.forEach { leg ->
                 points = decodePolyline(leg.encodedPolyline, leg.encodedPolylinePrecision)

common/data/src/main/java/com/kouros/navigation/model/NavigationViewModel.kt

@@ -3,6 +3,7 @@ package com.kouros.navigation.model
 //import com.kouros.navigation.data.Preferences.boxStore
 import android.content.Context
 import android.location.Location
+import android.util.Log
 import androidx.compose.runtime.snapshots.SnapshotStateList
 import androidx.compose.runtime.toMutableStateList
 import androidx.compose.ui.platform.isDebugInspectorInfoEnabled

common/data/src/main/java/com/kouros/navigation/model/RouteCalculator.kt

@@ -69,7 +69,7 @@ class RouteCalculator(var routeModel: RouteModel) {
                 distance
             }
         }
-        return (leftDistance / 10.0).roundToInt() * 10.0
+        return leftDistance.toDouble()
     }
 
     /** Returns the left distance in m.  */

common/data/src/main/java/com/kouros/navigation/model/SettingsViewModel.kt

@@ -1,7 +1,10 @@
 package com.kouros.navigation.model
 
+import androidx.datastore.preferences.core.edit
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.kouros.navigation.data.datastore.DataStoreManager.Companion.dataStore
+import com.kouros.navigation.data.datastore.DataStoreManager.PreferencesKeys
 import com.kouros.navigation.repository.SettingsRepository
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.stateIn
@@ -63,6 +66,12 @@ class SettingsViewModel(private val repository: SettingsRepository) : ViewModel(
         ""
     )
 
+    val distanceMode = repository.distanceModeFlow.stateIn(
+        viewModelScope,
+        SharingStarted.WhileSubscribed(5_000),
+        0
+    )
+
     fun onShow3DChanged(enabled: Boolean) {
         viewModelScope.launch { repository.setShow3D(enabled) }
     }
@@ -94,4 +103,9 @@ class SettingsViewModel(private val repository: SettingsRepository) : ViewModel(
     fun onTomTomApiKeyChanged(key: String) {
         viewModelScope.launch { repository.setTomTomApiKey(key) }
     }
+
+    fun onDistanceModeChanged(mode: Int) {
+        viewModelScope.launch { repository.setDistanceMode(mode) }
+    }
+
 }

common/data/src/main/java/com/kouros/navigation/repository/SettingsRepository.kt

@@ -33,8 +33,8 @@ class SettingsRepository(
     val recentPlacesFlow: Flow<String> =
         dataStoreManager.recentPlacesFlow
 
-    val favoritesFlow: Flow<String> =
+    val distanceModeFlow: Flow<Int> =
-        dataStoreManager.favoritesFlow
+        dataStoreManager.distanceModeFlow
 
 
     suspend fun setShow3D(enabled: Boolean) {
@@ -73,7 +73,9 @@ class SettingsRepository(
         dataStoreManager.setRecentPlaces(places)
     }
 
-    suspend fun setFavorites(favorites: String) {
+    suspend fun setDistanceMode(mode: Int) {
-        dataStoreManager.setFavorites(favorites)
+        dataStoreManager.setDistanceMode(mode)
     }
+
+
 }

common/data/src/main/java/com/kouros/navigation/utils/NavigationUtils.kt

@@ -3,6 +3,7 @@ package com.kouros.navigation.utils
 import android.content.Context
 import android.location.Location
 import android.location.LocationManager
+import androidx.car.app.model.Distance
 import com.kouros.navigation.data.RouteEngine
 import com.kouros.navigation.data.osrm.OsrmRepository
 import com.kouros.navigation.data.tomtom.TomTomRepository
@@ -16,6 +17,7 @@ import java.time.ZoneOffset
 import java.time.ZonedDateTime
 import java.time.format.DateTimeFormatter
 import java.time.format.FormatStyle
+import java.util.Locale
 import kotlin.math.absoluteValue
 import kotlin.math.pow
 import kotlin.math.roundToInt
@@ -110,3 +112,33 @@ fun duration(preview: Boolean, bearing: Double, lastBearing: Double): Duration {
     }
     return cameraDuration
 }
+
+fun isMetricSystem(): Boolean {
+    val country = Locale.getDefault().country
+    // Return true for metric, false for imperial
+    return !setOf("US", "UK", "LR", "MM").contains(country)
+}
+
+fun formattedDistance(distanceMode : Int, distance: Double): Pair<Double, Int> {
+    var currentDistance = distance
+    var displayUnit: Int
+    if (distanceMode == 1 || distanceMode == 0 && isMetricSystem())  {
+        displayUnit = if (currentDistance > 1000.0) {
+            currentDistance /= 1000.0
+            Distance.UNIT_KILOMETERS
+        } else {
+            currentDistance = (currentDistance / 10.0).roundToInt() * 10.0
+            Distance.UNIT_METERS
+        }
+    } else {
+        currentDistance *= 0.621371
+        displayUnit = if (currentDistance > 1000.0) {
+            currentDistance /= 1000.0
+            Distance.UNIT_MILES
+        } else {
+            currentDistance = (currentDistance / 10.0).roundToInt() * 10.0
+            Distance.UNIT_FEET
+        }
+    }
+    return Pair(currentDistance, displayUnit)
+}

common/data/src/main/java/com/kouros/navigation/utils/Settings.kt

@@ -2,6 +2,7 @@ package com.kouros.navigation.utils
 
 import android.content.Context
 import androidx.car.app.CarContext
+import androidx.car.app.model.Distance
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.lifecycle.ViewModel
@@ -13,6 +14,9 @@ import com.kouros.navigation.model.SettingsViewModel
 import com.kouros.navigation.repository.SettingsRepository
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.runBlocking
+import java.text.NumberFormat
+import java.util.Locale
+import kotlin.math.roundToInt
 
 
 @Composable

common/data/src/main/res/values-de/strings.xml

@@ -36,8 +36,8 @@
     <string name="use_telephon_settings">Verwende Telefon Einstellungen</string>
     <string name="threed_building">3D Gebäude</string>
     <string name="drive_now">Losfahren</string>
-    <string name="avoid_tolls_row_title" msgid="5194057244144831024">"Mautstraßen meiden"</string>
+    <string name="avoid_tolls_row_title" msgid="5194057244144831024">"Mautstraßen vermeiden"</string>
-    <string name="avoid_highways_row_title" msgid="4711913426200490304">"Autobahnen meiden"</string>
+    <string name="avoid_highways_row_title" msgid="4711913426200490304">"Autobahnen vermeiden"</string>
     <string name="recent_destinations">Letzte Ziele</string>
     <string name="contacts">Kontakte</string>
     <string name="route_preview">Route Vorschau</string>
@@ -54,5 +54,8 @@
     <string name="use_car_settings">Verwende Auto Einstellungen</string>
     <string name="exit_number">Ausfahrt nummer</string>
     <string name="navigation_icon_description">Navigations Icon</string>
-
+    <string name="distance_units">Entfernungseinheiten</string>
+    <string name="automaticaly">Automatisch</string>
+    <string name="kilometer">Kilometer</string>
+    <string name="miles">Meilen</string>
 </resources>

common/data/src/main/res/values/strings.xml

@@ -18,7 +18,7 @@
     <string name="avoid_highways_row_title">Avoid highways</string>
     <string name="avoid_tolls_row_title">Avoid tolls rows</string>
     <string name="no_places">No places</string>
-    <string name="recent_destinations">Recent destination</string>
+    <string name="recent_destinations">Recent destinations</string>
     <string name="contacts">Contacts</string>
     <string name="favorites">Favorites</string>
     <string name="recent_Item_deleted">Recent item deleted</string>
@@ -40,4 +40,8 @@
     <string name="use_car_settings">Use car settings</string>
     <string name="exit_number">Exit number</string>
     <string name="navigation_icon_description">Navigation icon</string>
+    <string name="distance_units">Distance units</string>
+    <string name="automaticaly">Automaticaly</string>
+    <string name="kilometer">Kilometer</string>
+    <string name="miles">Miles</string>
 </resources>

common/data/src/test/java/com/kouros/navigation/model/IconMapperTest.kt

@@ -35,33 +35,33 @@ class IconMapperTest {
 
     @Test
     fun `addLanes returns correct lane direction`() {
-        val stepDataNormalLeft = StepData("", 0.0, Maneuver.TYPE_TURN_NORMAL_LEFT, 0, 0L, 0.0)
+        val stepDataNormalLeft = StepData("", "", 0.0, Maneuver.TYPE_TURN_NORMAL_LEFT, 0, 0L, 0.0)
         assertEquals(LaneDirection.SHAPE_NORMAL_LEFT, iconMapper.addLanes("left_straight", stepDataNormalLeft))
         assertEquals(LaneDirection.SHAPE_NORMAL_LEFT, iconMapper.addLanes("left", stepDataNormalLeft))
         assertEquals(LaneDirection.SHAPE_SLIGHT_LEFT, iconMapper.addLanes("left_slight", stepDataNormalLeft))
         assertEquals(LaneDirection.SHAPE_SLIGHT_LEFT, iconMapper.addLanes("slight_left", stepDataNormalLeft))
 
-        val stepDataStraight = StepData("", 0.0, Maneuver.TYPE_STRAIGHT, 0, 0L, 0.0)
+        val stepDataStraight = StepData("", "", 0.0, Maneuver.TYPE_STRAIGHT, 0, 0L, 0.0)
         assertEquals(LaneDirection.SHAPE_STRAIGHT, iconMapper.addLanes("left_straight", stepDataStraight))
         assertEquals(LaneDirection.SHAPE_STRAIGHT, iconMapper.addLanes("straight", stepDataStraight))
         assertEquals(LaneDirection.SHAPE_STRAIGHT, iconMapper.addLanes("right_straight", stepDataStraight))
 
-        val stepDataKeepLeft = StepData("", 0.0, Maneuver.TYPE_KEEP_LEFT, 0, 0L, 0.0)
+        val stepDataKeepLeft = StepData("", "", 0.0, Maneuver.TYPE_KEEP_LEFT, 0, 0L, 0.0)
         assertEquals(LaneDirection.SHAPE_STRAIGHT, iconMapper.addLanes("straight", stepDataKeepLeft))
         assertEquals(LaneDirection.SHAPE_SLIGHT_LEFT, iconMapper.addLanes("left_slight", stepDataKeepLeft))
 
-        val stepDataKeepRight = StepData("", 0.0, Maneuver.TYPE_KEEP_RIGHT, 0, 0L, 0.0)
+        val stepDataKeepRight = StepData("", "", 0.0, Maneuver.TYPE_KEEP_RIGHT, 0, 0L, 0.0)
         assertEquals(LaneDirection.SHAPE_STRAIGHT, iconMapper.addLanes("straight", stepDataKeepRight))
 
-        val stepDataNormalRight = StepData("", 0.0, Maneuver.TYPE_TURN_NORMAL_RIGHT, 0, 0L, 0.0)
+        val stepDataNormalRight = StepData("", "", 0.0, Maneuver.TYPE_TURN_NORMAL_RIGHT, 0, 0L, 0.0)
         assertEquals(LaneDirection.SHAPE_NORMAL_RIGHT, iconMapper.addLanes("right", stepDataNormalRight))
         assertEquals(LaneDirection.SHAPE_NORMAL_RIGHT, iconMapper.addLanes("right_straight", stepDataNormalRight))
 
-        val stepDataSlightRight = StepData("", 0.0, Maneuver.TYPE_TURN_SLIGHT_RIGHT, 0, 0L, 0.0)
+        val stepDataSlightRight = StepData("", "", 0.0, Maneuver.TYPE_TURN_SLIGHT_RIGHT, 0, 0L, 0.0)
         assertEquals(LaneDirection.SHAPE_NORMAL_RIGHT, iconMapper.addLanes("right_slight", stepDataSlightRight))
         assertEquals(LaneDirection.SHAPE_NORMAL_RIGHT, iconMapper.addLanes("slight_right", stepDataSlightRight))
 
-        val stepDataUnknown = StepData("", 0.0, Maneuver.TYPE_UNKNOWN, 0, 0L, 0.0)
+        val stepDataUnknown = StepData("", "", 0.0, Maneuver.TYPE_UNKNOWN, 0, 0L, 0.0)
         assertEquals(LaneDirection.SHAPE_UNKNOWN, iconMapper.addLanes("left_straight", stepDataUnknown))
         assertEquals(LaneDirection.SHAPE_UNKNOWN, iconMapper.addLanes("left", stepDataUnknown))
         assertEquals(LaneDirection.SHAPE_UNKNOWN, iconMapper.addLanes("straight", stepDataUnknown))
@@ -74,24 +74,24 @@ class IconMapperTest {
 
     @Test
     fun `laneToResource returns correct resource string`() {
-        val stepDataNormalLeft = StepData("", 0.0, Maneuver.TYPE_TURN_NORMAL_LEFT, 0, 0L, 0.0)
+        val stepDataNormalLeft = StepData("", "", 0.0, Maneuver.TYPE_TURN_NORMAL_LEFT, 0, 0L, 0.0)
         assertEquals("left_o_straight_x", iconMapper.laneToResource(listOf("left", "straight"), stepDataNormalLeft))
         assertEquals("left_o", iconMapper.laneToResource(listOf("left"), stepDataNormalLeft))
         assertEquals("slight_left_o", iconMapper.laneToResource(listOf("slight_left"), stepDataNormalLeft))
 
-        val stepDataStraight = StepData("", 0.0, Maneuver.TYPE_STRAIGHT, 0, 0L, 0.0)
+        val stepDataStraight = StepData("", "", 0.0, Maneuver.TYPE_STRAIGHT, 0, 0L, 0.0)
         assertEquals("left_x_straight_o", iconMapper.laneToResource(listOf("left", "straight"), stepDataStraight))
         assertEquals("straight_o", iconMapper.laneToResource(listOf("straight"), stepDataStraight))
         assertEquals("right_x_straight_o", iconMapper.laneToResource(listOf("right_straight"), stepDataStraight))
 
-        val stepDataNormalRight = StepData("", 0.0, Maneuver.TYPE_TURN_NORMAL_RIGHT, 0, 0L, 0.0)
+        val stepDataNormalRight = StepData("", "", 0.0, Maneuver.TYPE_TURN_NORMAL_RIGHT, 0, 0L, 0.0)
         assertEquals("right_x_straight_x", iconMapper.laneToResource(listOf("right_straight"), stepDataNormalRight))
         assertEquals("right_o", iconMapper.laneToResource(listOf("right"), stepDataNormalRight))
 
-        val stepDataSlightRight = StepData("", 0.0, Maneuver.TYPE_TURN_SLIGHT_RIGHT, 0, 0L, 0.0)
+        val stepDataSlightRight = StepData("", "", 0.0, Maneuver.TYPE_TURN_SLIGHT_RIGHT, 0, 0L, 0.0)
         assertEquals("right_o_straight_o", iconMapper.laneToResource(listOf("right_straight"), stepDataSlightRight))
 
-        val stepDataUnknown = StepData("", 0.0, Maneuver.TYPE_UNKNOWN, 0, 0L, 0.0)
+        val stepDataUnknown = StepData("", "", 0.0, Maneuver.TYPE_UNKNOWN, 0, 0L, 0.0)
         assertEquals("left_x_straight_x", iconMapper.laneToResource(listOf("left", "straight"), stepDataUnknown))
         assertEquals("", iconMapper.laneToResource(listOf("invalid"), stepDataUnknown))
     }

gradle/libs.versions.toml

@@ -94,7 +94,6 @@ androidx-monitor = { group = "androidx.test", name = "monitor", version.ref = "m
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 android-library = { id = "com.android.library", version.ref = "agp" }
 kotlin-kapt = { id = "com.android.legacy-kapt", version.ref = "agp" }