fix: Updated new features for nullability

Features that were added before the pull request from @jonbhanson were
updated to support nullability.

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## 1.0.0
 
+Tanks to @jonbhanson
 * Adds null safety.
 * Refreshes the example app.
 * Updates .gitignore and removes files that should not be tracked.

example/lib/annotation_icons.dart

@@ -50,7 +50,7 @@ class AnnotationIconsBodyState extends State<AnnotationIconsBody> {
         annotationId: AnnotationId("annotation_1"),
         anchor: Offset(0.5, -4),
         position: LatLng(52.707755, -2.7540658),
-        icon: _annotationIcon!,
+        icon: _annotationIcon ?? BitmapDescriptor.defaultAnnotation,
       ),
     ].toSet();
   }

example/lib/place_annotation.dart

@@ -57,7 +57,7 @@ class PlaceAnnotationBodyState extends State<PlaceAnnotationBody> {
     final Annotation? tappedAnnotation = annotations[annotationId];
     if (tappedAnnotation != null) {
       setState(() {
-        if (annotations.containsKey(selectedAnnotation)) {
+        if (annotations.containsKey(tappedAnnotation)) {
           final Annotation resetOld =
               annotations[selectedAnnotation]!.copyWith();
           annotations[selectedAnnotation] = resetOld;

lib/src/controller.dart

@@ -219,20 +219,18 @@ class AppleMapController {
     return LatLngBounds(northeast: northeast, southwest: southwest);
   }
 
-
   /// A projection is used to translate between on screen location and geographic coordinates.
   /// Screen location is in screen pixels (not display pixels) with respect to the top left corner
   /// of the map, not necessarily of the whole screen.
-  Future<Offset> getScreenCoordinate(LatLng latLng) async {
+  Future<Offset?> getScreenCoordinate(LatLng latLng) async {
     final point = await channel
-        .invokeMapMethod<String, dynamic>(
-        'camera#convert', <String, dynamic>{
+        .invokeMapMethod<String, dynamic>('camera#convert', <String, dynamic>{
       'annotation': [latLng.latitude, latLng.longitude]
     });
-    if (!point.containsKey('point')) {
+    if (point != null && !point.containsKey('point')) {
       return null;
     }
-    final doubles = List<double>.from(point['point']);
+    final doubles = List<double>.from(point?['point']);
     return Offset(doubles.first, doubles.last);
   }
 }