chore: handle platform exceptions

example/lib/pages/camera.dart

@@ -41,16 +41,23 @@ class _CameraPageState extends ExamplePageState<CameraPage> {
   bool _showCameraUpdates = false;
   String _latestCameraUpdate = '';
   bool _isFollowingLocation = false;
+  bool _ready = false;
 
   // ignore: use_setters_to_change_properties
   Future<void> _onViewCreated(GoogleNavigationViewController controller) async {
-    _navigationViewController = controller;
-    calculateFocusCenter();
-    _minZoomLevel = await _navigationViewController.getMinZoomPreference();
-    _maxZoomLevel = await _navigationViewController.getMaxZoomPreference();
-
-    if (mounted) {
-      setState(() {});
+    try {
+      _navigationViewController = controller;
+      calculateFocusCenter();
+      _minZoomLevel = await _navigationViewController.getMinZoomPreference();
+      _maxZoomLevel = await _navigationViewController.getMaxZoomPreference();
+      if (mounted) {
+        setState(() {
+          _ready = true;
+        });
+      }
+    } on ViewNotFoundException catch (_) {
+      // View not found exception is thrown if view is disposed before async
+      // method is handled on native side.
     }
   }
 
@@ -148,7 +155,8 @@ class _CameraPageState extends ExamplePageState<CameraPage> {
                     _onCameraStartedFollowingLocation,
                 onCameraStoppedFollowingLocation:
                     _onCameraStoppedFollowingLocation),
-            getOverlayOptionsButton(context, onPressed: () => toggleOverlay()),
+            getOverlayOptionsButton(context,
+                onPressed: _ready ? () => toggleOverlay() : null),
             if (_showCameraUpdates)
               Container(
                 width: 180,
@@ -246,8 +254,9 @@ class _CameraPageState extends ExamplePageState<CameraPage> {
       setState(() {
         _minZoomLevel = newMinZoomLevel;
       });
-    } catch (e) {
-      showMessage(e.toString());
+    } on MinZoomRangeException catch (e) {
+      debugPrint(e.toString());
+      showMessage('Cannot set min zoom');
     }
   }
 
@@ -257,8 +266,9 @@ class _CameraPageState extends ExamplePageState<CameraPage> {
       setState(() {
         _maxZoomLevel = newMaxZoomLevel;
       });
-    } catch (e) {
-      showMessage(e.toString());
+    } on MaxZoomRangeException catch (e) {
+      debugPrint(e.toString());
+      showMessage('Cannot set max zoom');
     }
   }
 

example/lib/pages/circles.dart

@@ -87,8 +87,16 @@ class _CirclesPageState extends ExamplePageState<CirclesPage> {
   Future<void> _updateSelectedCircleWithOptions(CircleOptions options) async {
     final Circle newCircle = _selectedCircle!.copyWith(options: options);
 
-    final List<Circle?> circles =
-        await _navigationViewController.updateCircles(<Circle>[newCircle]);
+    final List<Circle?> circles;
+    try {
+      circles =
+          await _navigationViewController.updateCircles(<Circle>[newCircle]);
+    } on CircleNotFoundException catch (e) {
+      debugPrint(e.toString());
+      showMessage('Circle not found');
+      return;
+    }
+
     final Circle? circle = circles.firstOrNull;
     if (circle != null) {
       setState(() {
@@ -102,7 +110,13 @@ class _CirclesPageState extends ExamplePageState<CirclesPage> {
   }
 
   Future<void> _removeCircle() async {
-    await _navigationViewController.removeCircles(<Circle>[_selectedCircle!]);
+    try {
+      await _navigationViewController.removeCircles(<Circle>[_selectedCircle!]);
+    } on CircleNotFoundException catch (e) {
+      debugPrint(e.toString());
+      showMessage('Circle not found');
+      return;
+    }
 
     setState(() {
       _circles = _circles

example/lib/pages/map.dart

@@ -39,18 +39,18 @@ class BasicMapPage extends ExamplePage {
 
 class _MapPageState extends ExamplePageState<BasicMapPage> {
   late final GoogleMapViewController _mapViewController;
-  late bool isMyLocationEnabled = false;
-  late bool isMyLocationButtonEnabled = true;
-  late bool consumeMyLocationButtonClickEvent = false;
-  late bool isZoomGesturesEnabled = true;
-  late bool isZoomControlsEnabled = true;
-  late bool isCompassEnabled = true;
-  late bool isRotateGesturesEnabled = true;
-  late bool isScrollGesturesEnabled = true;
-  late bool isScrollGesturesEnabledDuringRotateOrZoom = true;
-  late bool isTiltGesturesEnabled = true;
-  late bool isTrafficEnabled = false;
-  late MapType mapType = MapType.normal;
+  bool isMyLocationEnabled = false;
+  bool isMyLocationButtonEnabled = true;
+  bool consumeMyLocationButtonClickEvent = false;
+  bool isZoomGesturesEnabled = true;
+  bool isZoomControlsEnabled = true;
+  bool isCompassEnabled = true;
+  bool isRotateGesturesEnabled = true;
+  bool isScrollGesturesEnabled = true;
+  bool isScrollGesturesEnabledDuringRotateOrZoom = true;
+  bool isTiltGesturesEnabled = true;
+  bool isTrafficEnabled = false;
+  MapType mapType = MapType.normal;
 
   Future<void> setMapType(MapType type) async {
     mapType = type;
@@ -65,13 +65,24 @@ class _MapPageState extends ExamplePageState<BasicMapPage> {
   Future<void> setMapStyleNight() async {
     final String jsonString =
         await rootBundle.loadString('assets/night_style.json');
-    await _mapViewController.setMapStyle(jsonString);
+
+    try {
+      await _mapViewController.setMapStyle(jsonString);
+    } on MapStyleException catch (e) {
+      debugPrint(e.toString());
+      _showMessage('Unable to set map style');
+    }
   }
 
   Future<void> setMapStyleSepia() async {
     final String jsonString =
         await rootBundle.loadString('assets/sepia_style.json');
-    await _mapViewController.setMapStyle(jsonString);
+    try {
+      await _mapViewController.setMapStyle(jsonString);
+    } on MapStyleException catch (e) {
+      debugPrint(e.toString());
+      _showMessage('Unable to set map style');
+    }
   }
 
   // ignore: use_setters_to_change_properties
@@ -172,7 +183,7 @@ class _MapPageState extends ExamplePageState<BasicMapPage> {
                     ),
                   ),
                 getOverlayOptionsButton(context,
-                    onPressed: () => toggleOverlay())
+                    onPressed: () => toggleOverlay()),
               ],
             ));
   }

example/lib/pages/markers.dart

@@ -69,7 +69,14 @@ class _MarkersPageState extends ExamplePageState<MarkersPage> {
   }
 
   Future<void> _removeMarker() async {
-    await _navigationViewController.removeMarkers(<Marker>[_selectedMarker!]);
+    try {
+      await _navigationViewController.removeMarkers(<Marker>[_selectedMarker!]);
+    } on MarkerNotFoundException catch (e) {
+      debugPrint(e.toString());
+      showMessage('Marker not found');
+      return;
+    }
+
     setState(() {
       _markers.remove(_selectedMarker);
       _selectedMarker = null;
@@ -86,8 +93,16 @@ class _MarkersPageState extends ExamplePageState<MarkersPage> {
   Future<void> _updateSelectedMarkerWithOptions(MarkerOptions options) async {
     final Marker newMarker = _selectedMarker!.copyWith(options: options);
 
-    final List<Marker?> markers =
-        await _navigationViewController.updateMarkers(<Marker>[newMarker]);
+    final List<Marker?> markers;
+    try {
+      markers =
+          await _navigationViewController.updateMarkers(<Marker>[newMarker]);
+    } on MarkerNotFoundException catch (e) {
+      debugPrint(e.toString());
+      showMessage('Marker not found');
+      return;
+    }
+
     final Marker? marker = markers.firstOrNull;
     if (marker != null) {
       setState(() {
@@ -153,8 +168,16 @@ class _MarkersPageState extends ExamplePageState<MarkersPage> {
         await assetImage.obtainKey(configuration);
     final double imagePixelRatio = assetBundleImageKey.scale;
     final ByteData imageBytes = await rootBundle.load(assetBundleImageKey.name);
-    _registeredCustomIcon = await registerBitmapImage(
-        bitmap: imageBytes, imagePixelRatio: imagePixelRatio);
+
+    try {
+      _registeredCustomIcon = await registerBitmapImage(
+          bitmap: imageBytes, imagePixelRatio: imagePixelRatio);
+    } on ImageDecodingFailedException catch (e) {
+      debugPrint(e.toString());
+      showMessage('Failed to decode image');
+      return ImageDescriptor.defaultImage;
+    }
+
     return _registeredCustomIcon!;
   }
 

example/lib/pages/multiple_views.dart

@@ -201,7 +201,13 @@ class _MultiplexState extends ExamplePageState<MultipleMapViewsPage> {
     setState(() {
       _navigationController = controller;
     });
-    await controller.setMyLocationEnabled(true);
+
+    try {
+      await controller.setMyLocationEnabled(true);
+    } on ViewNotFoundException catch (_) {
+      // View not found exception is thrown if view is disposed before async
+      // method is handled on native side.
+    }
   }
 
   Future<void> _moveCameras() async {

example/lib/pages/navigation.dart

@@ -475,7 +475,13 @@ class _NavigationPageState extends ExamplePageState<NavigationPage> {
     setState(() {
       _navigationViewController = controller;
     });
-    await controller.setMyLocationEnabled(true);
+
+    try {
+      await controller.setMyLocationEnabled(true);
+    } on ViewNotFoundException catch (_) {
+      // View not found exception is thrown if view is disposed before async
+      // method is handled on native side.
+    }
 
     if (_guidanceRunning) {
       // Guidance is running, enable navigation UI.
@@ -611,8 +617,17 @@ class _NavigationPageState extends ExamplePageState<NavigationPage> {
       // Update existing marker.
       final Marker updatedWaypointMarker =
           _newWaypointMarker!.copyWith(options: markerOptions);
-      final List<Marker?> updatedMarkers = await _navigationViewController!
-          .updateMarkers(<Marker>[updatedWaypointMarker]);
+
+      final List<Marker?> updatedMarkers;
+      try {
+        updatedMarkers = await _navigationViewController!
+            .updateMarkers(<Marker>[updatedWaypointMarker]);
+      } on MarkerNotFoundException catch (e) {
+        debugPrint(e.toString());
+        showMessage('Marker not found');
+        return;
+      }
+
       if (updatedMarkers.first != null) {
         _newWaypointMarker = updatedMarkers.first;
       } else {
@@ -623,24 +638,38 @@ class _NavigationPageState extends ExamplePageState<NavigationPage> {
   }
 
   Future<void> _removeNewWaypointMarker() async {
-    if (_newWaypointMarker != null) {
+    if (_newWaypointMarker == null) return;
+
+    try {
       await _navigationViewController!
           .removeMarkers(<Marker>[_newWaypointMarker!]);
-      _newWaypointMarker = null;
-      setState(() {});
+    } on MarkerNotFoundException catch (e) {
+      debugPrint(e.toString());
+      showMessage('Marker not found');
+      return;
     }
+
+    _newWaypointMarker = null;
+    setState(() {});
   }
 
   Future<void> _removeDestinationWaypointMarkers() async {
-    if (_destinationWaypointMarkers.isNotEmpty) {
+    if (_destinationWaypointMarkers.isEmpty) return;
+
+    try {
       await _navigationViewController!
           .removeMarkers(_destinationWaypointMarkers);
-      _destinationWaypointMarkers.clear();
-
-      // Unregister custom marker images
-      await clearRegisteredImages();
-      setState(() {});
+    } on MarkerNotFoundException catch (e) {
+      debugPrint(e.toString());
+      showMessage('Marker not found');
+      return;
     }
+
+    _destinationWaypointMarkers.clear();
+
+    // Unregister custom marker images
+    await clearRegisteredImages();
+    setState(() {});
   }
 
   Future<void> _onMapClicked(LatLng location) async {
@@ -690,16 +719,25 @@ class _NavigationPageState extends ExamplePageState<NavigationPage> {
     final ImageDescriptor waypointMarkerImage =
         await registerWaypointMarkerImage(
             index, MediaQuery.of(context).devicePixelRatio);
-    final List<Marker?> destinationMarkers =
-        await _navigationViewController!.updateMarkers(<Marker>[
-      _newWaypointMarker!.copyWith(
-        options: _newWaypointMarker!.options.copyWith(
-          infoWindow: InfoWindow(title: title),
-          anchor: const MarkerAnchor(u: 0.5, v: 1.2),
-          icon: waypointMarkerImage,
-        ),
-      )
-    ]);
+
+    final List<Marker?> destinationMarkers;
+    try {
+      destinationMarkers =
+          await _navigationViewController!.updateMarkers(<Marker>[
+        _newWaypointMarker!.copyWith(
+          options: _newWaypointMarker!.options.copyWith(
+            infoWindow: InfoWindow(title: title),
+            anchor: const MarkerAnchor(u: 0.5, v: 1.2),
+            icon: waypointMarkerImage,
+          ),
+        )
+      ]);
+    } on MarkerNotFoundException catch (e) {
+      debugPrint(e.toString());
+      showMessage('Marker not found');
+      return;
+    }
+
     _destinationWaypointMarkers.add(destinationMarkers.first!);
     _newWaypointMarker = null;
   }
@@ -723,7 +761,15 @@ class _NavigationPageState extends ExamplePageState<NavigationPage> {
     // Remove the first destination marker from the list.
     if (_destinationWaypointMarkers.isNotEmpty) {
       final Marker markerToRemove = _destinationWaypointMarkers.first;
-      await _navigationViewController!.removeMarkers(<Marker>[markerToRemove]);
+
+      try {
+        await _navigationViewController!
+            .removeMarkers(<Marker>[markerToRemove]);
+      } on MarkerNotFoundException catch (e) {
+        debugPrint(e.toString());
+        showMessage('Marker not found');
+        return;
+      }
 
       // Unregister custom marker image.
       await unregisterImage(markerToRemove.options.icon);