Updated app facing package and implemented isPresent() in example project

geocoding/example/lib/main.dart

@@ -78,7 +78,7 @@ class _GeocodeWidgetState extends State<GeocodeWidget> {
                   final longitude = double.parse(_longitudeController.text);
 
                   placemarkFromCoordinates(latitude, longitude)
-                      .then((placemarks) {
+                      ?.then((placemarks) {
                     var output = 'No results found.';
                     if (placemarks.isNotEmpty) {
                       output = placemarks[0].toString();
@@ -110,7 +110,7 @@ class _GeocodeWidgetState extends State<GeocodeWidget> {
                 child: Text('Look up location'),
                 onPressed: () {
                   locationFromAddress(_addressController.text)
-                      .then((locations) {
+                      ?.then((locations) {
                     var output = 'No results found.';
                     if (locations.isNotEmpty) {
                       output = locations[0].toString();
@@ -122,6 +122,21 @@ class _GeocodeWidgetState extends State<GeocodeWidget> {
                   });
                 }),
           ),
+          const Padding(
+            padding: EdgeInsets.only(top: 8),
+          ),
+          Center(
+            child: ElevatedButton(
+                child: Text('is Present'),
+                onPressed: () {
+                  isPresent()?.then((isPresent) {
+                    var output = isPresent ? 'Is present' : 'Is not present';
+                    setState(() {
+                      _output = output;
+                    });
+                  });
+                }),
+          ),
           Expanded(
             child: SingleChildScrollView(
               child: Container(

geocoding/lib/geocoding.dart

@@ -15,13 +15,12 @@ export 'package:geocoding_platform_interface/geocoding_platform_interface.dart';
 /// When not supplied the currently active locale of the device will be used.
 /// The `localeIdentifier` should be formatted using the syntax:
 /// [languageCode]_[countryCode] (eg. en_US or nl_NL).
-Future<List<Location>> locationFromAddress(
+Future<List<Location>>? locationFromAddress(
   String address, {
   String? localeIdentifier,
 }) =>
-    GeocodingPlatform.instance.locationFromAddress(
+    GeocodingPlatform.instance?.locationFromAddress(
       address,
-      localeIdentifier: localeIdentifier,
     );
 
 /// Returns a list of [Placemark] instances found for the supplied
@@ -36,13 +35,28 @@ Future<List<Location>> locationFromAddress(
 /// When not supplied the currently active locale of the device will be used.
 /// The `localeIdentifier` should be formatted using the syntax:
 /// [languageCode]_[countryCode] (eg. en_US or nl_NL).
-Future<List<Placemark>> placemarkFromCoordinates(
+Future<List<Placemark>>? placemarkFromCoordinates(
   double latitude,
   double longitude, {
   String? localeIdentifier,
 }) =>
-    GeocodingPlatform.instance.placemarkFromCoordinates(
+    GeocodingPlatform.instance?.placemarkFromCoordinates(
       latitude,
       longitude,
-      localeIdentifier: localeIdentifier,
     );
+
+/// Returns a list of [Location] instances found for the supplied address.
+///
+/// In most situations the returned list should only contain one entry.
+/// However in some situations where the supplied address could not be
+/// resolved into a single [Location], multiple [Location] instances may be
+/// returned.
+///
+/// Optionally you can specify a locale in which the results are returned.
+/// When not supplied the currently active locale of the device will be used.
+/// The `localeIdentifier` should be formatted using the syntax:
+/// [languageCode]_[countryCode] (eg. en_US or nl_NL).
+Future<bool>? isPresent({
+  String? localeIdentifier,
+}) =>
+    GeocodingPlatform.instance?.isPresent();

geocoding/pubspec.yaml

@@ -12,9 +12,9 @@ dependencies:
   flutter:
     sdk: flutter
 
-  geocoding_platform_interface: ^2.0.0
-  geocoding_android: ^2.1.0
-  geocoding_ios: ^2.1.0
+  geocoding_platform_interface: ^3.0.0
+  geocoding_android: ^3.0.0
+  geocoding_ios: ^2.0.0
 
 dev_dependencies:
   flutter_test:

geocoding/test/geocoding_test.dart

@@ -9,7 +9,7 @@ final mockLocation = Location(
   timestamp: DateTime.fromMillisecondsSinceEpoch(0).toUtc(),
 );
 
-final mockPlacemark = Placemark(
+const mockPlacemark = Placemark(
     administrativeArea: 'Overijssel',
     country: 'Netherlands',
     isoCountryCode: 'NL',
@@ -30,12 +30,12 @@ void main() {
 
     test('locationFromAddress', () async {
       final locations = await (locationFromAddress(''));
-      expect(locations.single, mockLocation);
+      expect(locations?.single, mockLocation);
     });
 
     test('placemarkFromCoordinates', () async {
       final placemarks = await (placemarkFromCoordinates(0, 0));
-      expect(placemarks.single, mockPlacemark);
+      expect(placemarks?.single, mockPlacemark);
     });
   });
 }