Remove preference setup for unit type in RouteViewModel (#593)

* Remove preference setup for unit type in RouteViewModel
- Only look at the NavigationViewOptions passed

* Pass unit type update method

* Remove ternary in favor of if else

libandroid-navigation-ui/src/main/java/com/mapbox/services/android/navigation/ui/v5/route/RouteViewModel.java

@@ -3,9 +3,7 @@
 import android.app.Application;
 import android.arch.lifecycle.AndroidViewModel;
 import android.arch.lifecycle.MutableLiveData;
-import android.content.SharedPreferences;
 import android.location.Location;
-import android.preference.PreferenceManager;
 import android.support.annotation.NonNull;
 
 import com.mapbox.api.directions.v5.DirectionsCriteria;
@@ -17,7 +15,6 @@
 import com.mapbox.mapboxsdk.Mapbox;
 import com.mapbox.services.android.navigation.ui.v5.NavigationViewOptions;
 import com.mapbox.services.android.navigation.v5.navigation.MapboxNavigation;
-import com.mapbox.services.android.navigation.v5.navigation.NavigationConstants;
 import com.mapbox.services.android.navigation.v5.navigation.NavigationRoute;
 import com.mapbox.services.android.navigation.v5.navigation.NavigationUnitType;
 
@@ -38,7 +35,6 @@ public class RouteViewModel extends AndroidViewModel implements Callback<Directi
 
   public RouteViewModel(@NonNull Application application) {
     super(application);
-    initUnitType(PreferenceManager.getDefaultSharedPreferences(application));
   }
 
   /**
@@ -77,6 +73,7 @@ public void updateRawLocation(@NonNull Location rawLocation) {
    * @param options holds either a set of {@link Point} coordinates or a {@link DirectionsRoute}
    */
   public void extractRouteOptions(NavigationViewOptions options) {
+    updateUnitType(options.navigationOptions().unitType());
     if (extractRouteOptions) {
       if (launchWithRoute(options)) {
         extractRouteFromOptions(options);
@@ -86,6 +83,21 @@ public void extractRouteOptions(NavigationViewOptions options) {
     }
   }
 
+  /**
+   * Updates the request unit type based on what was set in
+   * {@link NavigationViewOptions}.
+   *
+   * @param unitType to be used for route requests
+   */
+  private void updateUnitType(int unitType) {
+    boolean isImperialUnitType = unitType == NavigationUnitType.TYPE_IMPERIAL;
+    if (isImperialUnitType) {
+      this.unitType = DirectionsCriteria.IMPERIAL;
+    } else {
+      this.unitType = DirectionsCriteria.METRIC;
+    }
+  }
+
   /**
    * Called when an off-route event is fired and a new {@link DirectionsRoute}
    * is needed to continue navigating.
@@ -98,16 +110,6 @@ public void fetchRouteNewOrigin(Point newOrigin) {
     }
   }
 
-  /**
-   * Initializes distance unit (imperial or metric).
-   */
-  private void initUnitType(SharedPreferences preferences) {
-    int unitType = preferences.getInt(NavigationConstants.NAVIGATION_VIEW_UNIT_TYPE,
-      NavigationUnitType.TYPE_IMPERIAL);
-    boolean isImperialUnitType = unitType == NavigationUnitType.TYPE_IMPERIAL;
-    this.unitType = isImperialUnitType ? DirectionsCriteria.IMPERIAL : DirectionsCriteria.METRIC;
-  }
-
   /**
    * Requests a new {@link DirectionsRoute}.
    * <p>

libandroid-navigation/src/main/java/com/mapbox/services/android/navigation/v5/navigation/NavigationConstants.java

@@ -150,11 +150,9 @@ private NavigationConstants() {
   public static final String NAVIGATION_VIEW_DESTINATION_LNG_KEY = "destination_long";
   public static final String NAVIGATION_VIEW_DESTINATION = "destination";
   public static final String NAVIGATION_VIEW_ROUTE_KEY = "route_json";
-  public static final String NAVIGATION_VIEW_LAUNCH_ROUTE = "launch_with_route";
   public static final String NAVIGATION_VIEW_AWS_POOL_ID = "navigation_view_aws_pool_id";
   public static final String NAVIGATION_VIEW_UNIT_TYPE = "navigation_view_unit_type";
   public static final String NAVIGATION_VIEW_REROUTING = "Rerouting";
-  public static final String ROUTE_BELOW_LAYER = "admin-3-4-boundaries-bg";
   public static final String DECIMAL_FORMAT = "#.#";
 
   // Step Maneuver Types