Migrate compass_app to SharedPreferencesAsync

background_isolate_channels/lib/main.dart

@@ -65,10 +65,12 @@ class _MyHomePageState extends State<MyHomePage> {
     // Write the value to [SharedPreferences] which will get read on the
     // [SimpleDatabase]'s isolate. For this example the value is always true
     // just for demonstration purposes.
-    final Future<void> sharedPreferencesSet = SharedPreferences.getInstance()
-        .then(
-          (sharedPreferences) => sharedPreferences.setBool('isDebug', true),
-        );
+    final SharedPreferencesAsync sharedPreferences = SharedPreferencesAsync();
+
+    final Future<void> sharedPreferencesSet = sharedPreferences.setBool(
+      'isDebug',
+      true,
+    );
     final Future<Directory> tempDirFuture = path_provider
         .getTemporaryDirectory();
 

compass_app/app/integration_test/app_server_data_test.dart

@@ -30,7 +30,7 @@ void main() {
 
     setUpAll(() async {
       // Clear any stored shared preferences
-      final sharedPreferences = await SharedPreferences.getInstance();
+      final sharedPreferences = SharedPreferencesAsync();
       await sharedPreferences.clear();
 
       // Start the dart server

compass_app/app/lib/data/services/shared_preferences_service.dart

@@ -13,9 +13,11 @@ class SharedPreferencesService {
 
   Future<Result<String?>> fetchToken() async {
     try {
-      final sharedPreferences = await SharedPreferences.getInstance();
+      final sharedPreferences = SharedPreferencesAsync();
+
       _log.finer('Got token from SharedPreferences');
-      return Result.ok(sharedPreferences.getString(_tokenKey));
+
+      return Result.ok(await sharedPreferences.getString(_tokenKey));
     } on Exception catch (e) {
       _log.warning('Failed to get token', e);
       return Result.error(e);
@@ -24,14 +26,18 @@ class SharedPreferencesService {
 
   Future<Result<void>> saveToken(String? token) async {
     try {
-      final sharedPreferences = await SharedPreferences.getInstance();
+      final sharedPreferences = SharedPreferencesAsync();
+
       if (token == null) {
         _log.finer('Removed token');
+
         await sharedPreferences.remove(_tokenKey);
       } else {
         _log.finer('Replaced token');
+
         await sharedPreferences.setString(_tokenKey, token);
       }
+
       return const Result.ok(null);
     } on Exception catch (e) {
       _log.warning('Failed to set token', e);