[android] deactivating default location engine when the map is destroyed

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapView.java

@@ -426,6 +426,10 @@ public class MapView extends FrameLayout implements NativeMapView.ViewCallback {
     onMapChangedListeners.clear();
     mapCallback.clearOnMapReadyCallbacks();
 
+    if (mapboxMap != null) {
+      mapboxMap.onDestroy();
+    }
+
     if (nativeMapView != null && hasSurface) {
       // null when destroying an activity programmatically mapbox-navigation-android/issues/503
       nativeMapView.destroy();

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapboxMap.java

@@ -158,6 +158,13 @@ public final class MapboxMap {
     }
   }
 
+  /**
+   * Called when the hosting Activity/Fragment onDestroy()/onDestroyView() method is called.
+   */
+  void onDestroy() {
+    locationLayerPlugin.onDestroy();
+  }
+
   /**
    * Called before the OnMapReadyCallback is invoked.
    */

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/plugins/locationlayer/LocationLayerPlugin.java

@@ -653,12 +653,6 @@ public final class LocationLayerPlugin {
    * Internal use.
    */
   public void onStart() {
-    // TODO: 03.09.18 LLP when map destroyed
-    /*if (context.isDestroyed()) {
-      Logger.e("You are calling plugins #onStart after the map was destroyed. Re-create the plugin before using it.");
-      return;
-    }*/
-
     isPluginStarted = true;
     onLocationLayerStart();
   }
@@ -671,6 +665,15 @@ public final class LocationLayerPlugin {
     isPluginStarted = false;
   }
 
+  /**
+   * Internal use.
+   */
+  public void onDestroy() {
+    if (locationEngine != null && usingInternalLocationEngine) {
+      locationEngine.deactivate();
+    }
+  }
+
   /**
    * Internal use.
    */