feat(repo): Add a linting script

.gitlint

@@ -0,0 +1,14 @@
+[general]
+ignore=B5,B6,B7,B8
+
+[title-max-length]
+line-length=72
+
+[title-trailing-punctuation]
+[title-hard-tab]
+[title-match-regex]
+regex=^(feat|fix|chore)\((android|ios|linux|windows|macos|all|docs|service|media|platform|notifications|picker|repo)\): [A-Z0-9].*$
+
+
+[body-trailing-whitespace]
+[body-first-line-empty]

android/src/main/kotlin/org/moxxy/moxxy_native/MoxxyNativePlugin.kt

@@ -10,9 +10,9 @@ import androidx.activity.result.PickVisualMediaRequest
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.annotation.NonNull
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import io.flutter.embedding.engine.plugins.FlutterPlugin
 import io.flutter.embedding.engine.plugins.activity.ActivityAware
 import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding
-import io.flutter.embedding.engine.plugins.FlutterPlugin
 import io.flutter.embedding.engine.plugins.service.ServiceAware
 import io.flutter.embedding.engine.plugins.service.ServicePluginBinding
 import io.flutter.plugin.common.EventChannel
@@ -99,7 +99,7 @@ class MoxxyNativePlugin : FlutterPlugin, ActivityAware, ServiceAware, BroadcastR
         channel = MethodChannel(flutterPluginBinding.getBinaryMessenger(), SERVICE_FOREGROUND_METHOD_CHANNEL_KEY)
         LocalBroadcastManager.getInstance(context!!).registerReceiver(
             this,
-            IntentFilter(SERVICE_FOREGROUND_METHOD_CHANNEL_KEY)
+            IntentFilter(SERVICE_FOREGROUND_METHOD_CHANNEL_KEY),
         )
 
         // Register the picker handler
@@ -110,7 +110,7 @@ class MoxxyNativePlugin : FlutterPlugin, ActivityAware, ServiceAware, BroadcastR
     override fun onDetachedFromEngine(@NonNull binding: FlutterPlugin.FlutterPluginBinding) {
         LocalBroadcastManager.getInstance(context!!).registerReceiver(
             this,
-             IntentFilter(SERVICE_FOREGROUND_METHOD_CHANNEL_KEY),
+            IntentFilter(SERVICE_FOREGROUND_METHOD_CHANNEL_KEY),
         )
         Log.d(TAG, "Detached from engine")
     }

android/src/main/kotlin/org/moxxy/moxxy_native/service/BackgroundService.kt

@@ -66,6 +66,13 @@ object BackgroundServiceStatic {
         )
     }
 
+    fun setConfiguration(context: Context, handle: Long, extraData: String) {
+        context.getSharedPreferences(SERVICE_SHARED_PREFERENCES_KEY, Context.MODE_PRIVATE).edit()
+            .putLong(SERVICE_ENTRYPOINT_KEY, handle)
+            .putString(SERVICE_EXTRA_DATA_KEY, extraData)
+            .apply()
+    }
+
     fun getStartAtBoot(context: Context): Boolean {
         return context.getSharedPreferences(SERVICE_SHARED_PREFERENCES_KEY, Context.MODE_PRIVATE)
             .getBoolean(
@@ -87,6 +94,19 @@ object BackgroundServiceStatic {
                 false,
             )
     }
+
+    fun setManuallyStopped(context: Context, value: Boolean) {
+        context.getSharedPreferences(SERVICE_SHARED_PREFERENCES_KEY, Context.MODE_PRIVATE).edit()
+            .putBoolean(SERVICE_MANUALLY_STOPPED_KEY, value)
+            .apply()
+    }
+
+    fun getHandle(context: Context): Long {
+        return context.getSharedPreferences(SERVICE_SHARED_PREFERENCES_KEY, Context.MODE_PRIVATE).getLong(
+            SERVICE_ENTRYPOINT_KEY,
+            0,
+        )
+    }
 }
 
 class BackgroundService : Service(), MoxxyBackgroundServiceApi {
@@ -110,19 +130,6 @@ class BackgroundService : Service(), MoxxyBackgroundServiceApi {
     private var notificationTitle: String = SERVICE_DEFAULT_TITLE
     private var notificationBody: String = SERVICE_DEFAULT_BODY
 
-    private fun setManuallyStopped(context: Context, value: Boolean) {
-        context.getSharedPreferences(SERVICE_SHARED_PREFERENCES_KEY, Context.MODE_PRIVATE).edit()
-            .putBoolean(SERVICE_MANUALLY_STOPPED_KEY, value)
-            .apply()
-    }
-
-    private fun getHandle(): Long {
-        return getSharedPreferences(SERVICE_SHARED_PREFERENCES_KEY, Context.MODE_PRIVATE).getLong(
-            SERVICE_ENTRYPOINT_KEY,
-            0,
-        )
-    }
-
     private fun updateNotificationInfo() {
         val mutable =
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) PendingIntent.FLAG_MUTABLE else 0
@@ -167,7 +174,7 @@ class BackgroundService : Service(), MoxxyBackgroundServiceApi {
                 null,
             )
             val callback: FlutterCallbackInformation =
-                FlutterCallbackInformation.lookupCallbackInformation(getHandle())
+                FlutterCallbackInformation.lookupCallbackInformation(BackgroundServiceStatic.getHandle(this))
             if (callback == null) {
                 Log.e(TAG, "Callback handle not found")
                 return
@@ -209,7 +216,7 @@ class BackgroundService : Service(), MoxxyBackgroundServiceApi {
         if (!isManuallyStopped) {
             BackgroundServiceStatic.enqueue(this)
         } else {
-            setManuallyStopped(applicationContext, true)
+            BackgroundServiceStatic.setManuallyStopped(applicationContext, true)
         }
 
         // Dispose of the engine
@@ -232,17 +239,13 @@ class BackgroundService : Service(), MoxxyBackgroundServiceApi {
     }
 
     override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
-        setManuallyStopped(this, false)
+        BackgroundServiceStatic.setManuallyStopped(this, false)
         BackgroundServiceStatic.enqueue(this)
         runService()
 
         return START_STICKY
     }
 
-    override fun getHandler(): Long {
-        return getHandle()
-    }
-
     override fun getExtraData(): String {
         return getSharedPreferences(SERVICE_SHARED_PREFERENCES_KEY, Context.MODE_PRIVATE).getString(
             SERVICE_EXTRA_DATA_KEY,

android/src/main/kotlin/org/moxxy/moxxy_native/service/ServiceImplementation.kt

@@ -6,9 +6,6 @@ import android.content.Intent
 import android.util.Log
 import androidx.core.content.ContextCompat
 import org.moxxy.moxxy_native.MoxxyNativePlugin
-import org.moxxy.moxxy_native.SERVICE_ENTRYPOINT_KEY
-import org.moxxy.moxxy_native.SERVICE_EXTRA_DATA_KEY
-import org.moxxy.moxxy_native.SERVICE_SHARED_PREFERENCES_KEY
 import org.moxxy.moxxy_native.TAG
 import org.moxxy.moxxy_native.service.BackgroundServiceStatic.setStartAtBoot
 
@@ -18,10 +15,11 @@ object PluginTracker {
 
 class ServiceImplementation(private val context: Context) : MoxxyServiceApi {
     override fun configure(handle: Long, extraData: String) {
-        context.getSharedPreferences(SERVICE_SHARED_PREFERENCES_KEY, Context.MODE_PRIVATE).edit()
+        BackgroundServiceStatic.setConfiguration(
-            .putLong(SERVICE_ENTRYPOINT_KEY, handle)
+            context,
-            .putString(SERVICE_EXTRA_DATA_KEY, extraData)
+            handle,
-            .apply()
+            extraData,
+        )
     }
 
     override fun isRunning(): Boolean {

android/src/main/kotlin/org/moxxy/moxxy_native/service/background/BackgroundServiceApi.kt

@@ -43,7 +43,6 @@ class FlutterError(
 
 /** Generated interface from Pigeon that represents a handler of messages from Flutter. */
 interface MoxxyBackgroundServiceApi {
-    fun getHandler(): Long
     fun getExtraData(): String
     fun setNotificationBody(body: String)
     fun sendData(data: String)
@@ -58,22 +57,6 @@ interface MoxxyBackgroundServiceApi {
         /** Sets up an instance of `MoxxyBackgroundServiceApi` to handle messages through the `binaryMessenger`. */
         @Suppress("UNCHECKED_CAST")
         fun setUp(binaryMessenger: BinaryMessenger, api: MoxxyBackgroundServiceApi?) {
-            run {
-                val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.getHandler", codec)
-                if (api != null) {
-                    channel.setMessageHandler { _, reply ->
-                        var wrapped: List<Any?>
-                        try {
-                            wrapped = listOf<Any?>(api.getHandler())
-                        } catch (exception: Throwable) {
-                            wrapped = wrapError(exception)
-                        }
-                        reply.reply(wrapped)
-                    }
-                } else {
-                    channel.setMessageHandler(null)
-                }
-            }
             run {
                 val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.getExtraData", codec)
                 if (api != null) {

example/lib/main.dart

@@ -1,3 +1,4 @@
+// ignore_for_file: avoid_print
 import 'dart:io';
 import 'dart:typed_data';
 import 'package:flutter/material.dart';
@@ -10,13 +11,14 @@ import 'package:permission_handler/permission_handler.dart';
 Future<void> serviceHandleData(Map<String, dynamic>? data) async {
   print('[BG] Received data $data');
   GetIt.I.get<BackgroundService>().send(
-    TestEvent(),
+        TestEvent(),
-    id: data!['id']! as String,
+        id: data!['id']! as String,
-  );
+      );
 }
 
 @pragma('vm:entry-point')
 Future<void> serviceEntrypoint(String initialLocale) async {
+  // avoid_print
   print('Initial locale: $initialLocale');
 }
 
@@ -34,15 +36,15 @@ class MyApp extends StatefulWidget {
 class TestCommand extends BackgroundCommand {
   @override
   Map<String, dynamic> toJson() => {
-    'request': 'return_name',
+        'request': 'return_name',
-  };
+      };
 }
 
 class TestEvent extends BackgroundEvent {
   @override
   Map<String, dynamic> toJson() => {
-    'name': 'Moxxy',
+        'name': 'Moxxy',
-  };
+      };
 }
 
 class MyAppState extends State<MyApp> {
@@ -61,7 +63,6 @@ class MyAppState extends State<MyApp> {
               onPressed: () async {
                 final result = await MoxxyPickerApi()
                     .pickFiles(FilePickerType.image, false);
-                // ignore: avoid_print
                 print('User picked: $result');
               },
               child: const Text('Photo picker'),
@@ -70,7 +71,6 @@ class MyAppState extends State<MyApp> {
               onPressed: () async {
                 final result = await MoxxyPickerApi()
                     .pickFiles(FilePickerType.imageAndVideo, true);
-                // ignore: avoid_print
                 print('User picked: $result');
               },
               child: const Text('Photo/Video multi-picker'),
@@ -79,7 +79,6 @@ class MyAppState extends State<MyApp> {
               onPressed: () async {
                 final result = await MoxxyPickerApi()
                     .pickFiles(FilePickerType.generic, true);
-                // ignore: avoid_print
                 print('User picked: $result');
               },
               child: const Text('Generic multi-picker'),
@@ -101,7 +100,6 @@ class MyAppState extends State<MyApp> {
                   'SHA-256',
                 );
                 if (encResult == null) {
-                  // ignore: avoid_print
                   print('Failed to encrypt file');
                   return;
                 }
@@ -115,7 +113,6 @@ class MyAppState extends State<MyApp> {
                   'SHA-256',
                 );
                 if (decResult == null) {
-                  // ignore: avoid_print
                   print('Failed to decrypt file');
                   return;
                 }
@@ -146,7 +143,7 @@ class MyAppState extends State<MyApp> {
 
                   await Permission.notification.request();
 
-                  final srv = ForegroundService();
+                  final srv = getForegroundService();
                   await srv.start(
                     const ServiceConfig(
                       serviceEntrypoint,
@@ -159,7 +156,7 @@ class MyAppState extends State<MyApp> {
                   );
 
                   await Future<void>.delayed(const Duration(milliseconds: 600));
-                  await srv.dataSender.sendData(
+                  await getForegroundService().send(
                     TestCommand(),
                     awaitable: false,
                   );

example/pubspec.lock

@@ -108,7 +108,7 @@ packages:
     source: hosted
     version: "2.0.1"
   logging:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: logging
       sha256: "623a88c9594aa774443aa3eb2d41807a48486b5613e67599fb4c41c0ad47c340"

example/pubspec.yaml

@@ -30,6 +30,7 @@ dependencies:
   cupertino_icons: ^1.0.2
   permission_handler: ^10.4.5
   get_it: ^7.6.0
+  logging: ^1.2.0
 
 dev_dependencies:
   flutter_test:

lib/moxxy_native.dart

@@ -6,4 +6,7 @@ export 'pigeon/notifications.g.dart';
 export 'pigeon/picker.g.dart';
 export 'pigeon/platform.g.dart';
 export 'pigeon/service.g.dart';
-export 'src/service.dart';
+export 'src/service/background/base.dart';
+export 'src/service/config.dart';
+export 'src/service/datasender/types.dart';
+export 'src/service/foreground/base.dart';

lib/pigeon/background_service.g.dart

@@ -18,33 +18,6 @@ class MoxxyBackgroundServiceApi {
 
   static const MessageCodec<Object?> codec = StandardMessageCodec();
 
-  Future<int> getHandler() async {
-    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
-        'dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.getHandler', codec,
-        binaryMessenger: _binaryMessenger);
-    final List<Object?>? replyList =
-        await channel.send(null) as List<Object?>?;
-    if (replyList == null) {
-      throw PlatformException(
-        code: 'channel-error',
-        message: 'Unable to establish connection on channel.',
-      );
-    } else if (replyList.length > 1) {
-      throw PlatformException(
-        code: replyList[0]! as String,
-        message: replyList[1] as String?,
-        details: replyList[2],
-      );
-    } else if (replyList[0] == null) {
-      throw PlatformException(
-        code: 'null-error',
-        message: 'Host platform returned null value for non-null return value.',
-      );
-    } else {
-      return (replyList[0] as int?)!;
-    }
-  }
-
   Future<String> getExtraData() async {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
         'dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.getExtraData', codec,

lib/pigeon/service.g.dart

@@ -22,8 +22,8 @@ class MoxxyServiceApi {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
         'dev.flutter.pigeon.moxxy_native.MoxxyServiceApi.configure', codec,
         binaryMessenger: _binaryMessenger);
-    final List<Object?>? replyList =
+    final List<Object?>? replyList = await channel
-        await channel.send(<Object?>[arg_handle, arg_extraData]) as List<Object?>?;
+        .send(<Object?>[arg_handle, arg_extraData]) as List<Object?>?;
     if (replyList == null) {
       throw PlatformException(
         code: 'channel-error',
@@ -44,8 +44,7 @@ class MoxxyServiceApi {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
         'dev.flutter.pigeon.moxxy_native.MoxxyServiceApi.isRunning', codec,
         binaryMessenger: _binaryMessenger);
-    final List<Object?>? replyList =
+    final List<Object?>? replyList = await channel.send(null) as List<Object?>?;
-        await channel.send(null) as List<Object?>?;
     if (replyList == null) {
       throw PlatformException(
         code: 'channel-error',
@@ -71,8 +70,7 @@ class MoxxyServiceApi {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
         'dev.flutter.pigeon.moxxy_native.MoxxyServiceApi.start', codec,
         binaryMessenger: _binaryMessenger);
-    final List<Object?>? replyList =
+    final List<Object?>? replyList = await channel.send(null) as List<Object?>?;
-        await channel.send(null) as List<Object?>?;
     if (replyList == null) {
       throw PlatformException(
         code: 'channel-error',

lib/src/service.dart

@@ -1,168 +0,0 @@
-import 'dart:async';
-import 'dart:convert';
-import 'dart:io';
-import 'dart:ui';
-import 'package:flutter/cupertino.dart';
-import 'package:flutter/services.dart';
-import 'package:logging/logging.dart';
-import 'package:moxlib/moxlib.dart';
-import 'package:moxxy_native/moxxy_native.dart';
-import 'package:moxxy_native/src/service_android.dart';
-import 'package:uuid/uuid.dart';
-
-typedef EntrypointCallback = Future<void> Function(String initialLocale);
-typedef HandleEventCallback = Future<void> Function(Map<String, dynamic>? data);
-
-abstract class BackgroundCommand implements JsonImplementation {}
-
-abstract class BackgroundEvent implements JsonImplementation {}
-
-class ServiceConfig {
-  const ServiceConfig(
-    this.entrypoint,
-    this.handleData,
-    this.initialLocale,
-  );
-
-  factory ServiceConfig.fromString(String rawData) {
-    final data = jsonDecode(rawData) as Map<String, dynamic>;
-    return ServiceConfig(
-      PluginUtilities.getCallbackFromHandle(
-        CallbackHandle.fromRawHandle(
-          data['entrypoint']! as int,
-        ),
-      )! as EntrypointCallback,
-      PluginUtilities.getCallbackFromHandle(
-        CallbackHandle.fromRawHandle(
-          data['handleData']! as int,
-        ),
-      )! as HandleEventCallback,
-      data['initialLocale']! as String,
-    );
-  }
-
-  final String initialLocale;
-  final EntrypointCallback entrypoint;
-  final HandleEventCallback handleData;
-
-  @override
-  String toString() {
-    return jsonEncode({
-      'entrypoint': PluginUtilities.getCallbackHandle(entrypoint)!.toRawHandle(),
-      'handleData': PluginUtilities.getCallbackHandle(handleData)!.toRawHandle(),
-      'initialLocale': initialLocale,
-    });
-  }
-}
-
-/// Wrapper API that is only available to the background service.
-class BackgroundService {
-  final MoxxyBackgroundServiceApi _api = MoxxyBackgroundServiceApi();
-
-  /// A method channel for Foreground -> Service communication
-  // TODO(Unknown): Move this into a constant for reuse
-  final MethodChannel _channel = MethodChannel('org.moxxy.moxxy_native/background');
-
-  /// A logger.
-  final Logger _log = Logger('BackgroundService');
-
-  Future<void> send(BackgroundEvent event, {String? id}) async {
-    final data = DataWrapper(
-      id ?? const Uuid().v4(),
-      event,
-    );
-
-    await _api.sendData(jsonEncode(data.toJson()));
-  }
-
-  void init(
-    ServiceConfig config,
-  ) {
-    // Ensure that the Dart executor is ready to use plugins
-    WidgetsFlutterBinding.ensureInitialized();
-    DartPluginRegistrant.ensureInitialized();
-
-    // Register the channel for Foreground -> Service communication
-    _channel.setMethodCallHandler((call) async {
-      // TODO(Unknown): Maybe do something smarter like pigeon and use Lists instead of Maps
-      final args = call.arguments! as String;
-      await config.handleData(jsonDecode(args) as Map<String, dynamic>);
-    });
-
-    // Start execution
-    _log.finest('Setup complete. Calling main entrypoint...');
-    config.entrypoint(config.initialLocale);
-  }
-
-  void setNotificationBody(String body) {
-    _api.setNotificationBody(body);
-  }
-}
-
-class ForegroundServiceDataSender extends AwaitableDataSender<BackgroundCommand, BackgroundEvent> {
-  ForegroundServiceDataSender(this._api); 
-  final MoxxyServiceApi _api;
-
-  @override
-  Future<void> sendDataImpl(DataWrapper<JsonImplementation> data) {
-    return _api.sendData(jsonEncode(data.toJson()));
-  }
-}
-
-/// Wrapper API that is only available to the UI isolate.
-// TODO(Unknown): Dumb naming. Name it something better
-class ForegroundService {
-  ForegroundService() {
-    dataSender = ForegroundServiceDataSender(_api);
-  }
-
-  final MoxxyServiceApi _api = MoxxyServiceApi();
-
-  /// A method channel for background service -> UI isolate communication.
-  final MethodChannel _channel = MethodChannel('org.moxxy.moxxy_native/foreground');
-
-  late final ForegroundServiceDataSender dataSender;
-
-  /// A logger.
-  final Logger _log = Logger('ForegroundService');
-
-  Future<void> attach(
-    HandleEventCallback handleData,    
-  ) async {
-    _channel.setMethodCallHandler((call) async {
-      await handleData(
-        jsonDecode(call.arguments! as String) as Map<String, dynamic>,
-      );
-    });
-  }
-
-  Future<void> start(
-    ServiceConfig config, HandleEventCallback uiHandleData,
-  ) async {
-    int platformEntrypointHandle;
-    if (Platform.isAndroid) {
-      platformEntrypointHandle = PluginUtilities.getCallbackHandle(
-        androidEntrypoint,
-      )!.toRawHandle();
-    } else {
-      // TODO: Custom exception
-      throw Exception('Unsupported platform');
-    }
-
-    // Configure the service on the native side
-    await _api.configure(platformEntrypointHandle, config.toString());
-
-    // Prepare the method channel
-    await attach(uiHandleData);
-
-    // Start the service
-    await _api.start();
-    _log.finest('Background service started...');
-  }
-
-  /// Returns true if the background service is already running. False, if not.
-  Future<bool> isRunning() async {
-    WidgetsFlutterBinding.ensureInitialized();
-    return _api.isRunning();
-  }
-}

lib/src/service/background/base.dart

@@ -0,0 +1,16 @@
+import 'package:moxxy_native/src/service/config.dart';
+import 'package:moxxy_native/src/service/datasender/types.dart';
+
+/// Wrapper API that is only available to the background service.
+abstract class BackgroundService {
+  /// Send [event] with optional id [id] to the foreground.
+  Future<void> send(BackgroundEvent event, {String? id});
+
+  /// Platform specific initialization routine that is called after
+  /// the entrypoint has been called.
+  Future<void> init(ServiceConfig config);
+
+  /// Update the notification body, if the platform shows a persistent
+  /// notification.
+  void setNotificationBody(String body);
+}

lib/src/service/background/pigeon.dart

@@ -0,0 +1,58 @@
+import 'dart:convert';
+import 'dart:ui';
+import 'package:flutter/services.dart';
+import 'package:flutter/widgets.dart';
+import 'package:logging/logging.dart';
+import 'package:moxlib/moxlib.dart';
+import 'package:moxxy_native/pigeon/background_service.g.dart';
+import 'package:moxxy_native/src/service/background/base.dart';
+import 'package:moxxy_native/src/service/config.dart';
+import 'package:moxxy_native/src/service/datasender/types.dart';
+import 'package:uuid/uuid.dart';
+
+class PigeonBackgroundService extends BackgroundService {
+  final MoxxyBackgroundServiceApi _api = MoxxyBackgroundServiceApi();
+
+  /// A method channel for Foreground -> Service communication
+  // TODO(Unknown): Move this into a constant for reuse
+  final MethodChannel _channel =
+      const MethodChannel('org.moxxy.moxxy_native/background');
+
+  /// A logger.
+  final Logger _log = Logger('PigeonBackgroundService');
+
+  @override
+  Future<void> send(BackgroundEvent event, {String? id}) async {
+    final data = DataWrapper(
+      id ?? const Uuid().v4(),
+      event,
+    );
+
+    await _api.sendData(jsonEncode(data.toJson()));
+  }
+
+  @override
+  Future<void> init(
+    ServiceConfig config,
+  ) async {
+    // Ensure that the Dart executor is ready to use plugins
+    WidgetsFlutterBinding.ensureInitialized();
+    DartPluginRegistrant.ensureInitialized();
+
+    // Register the channel for Foreground -> Service communication
+    _channel.setMethodCallHandler((call) async {
+      // TODO(Unknown): Maybe do something smarter like pigeon and use Lists instead of Maps
+      final args = call.arguments! as String;
+      await config.handleData(jsonDecode(args) as Map<String, dynamic>);
+    });
+
+    // Start execution
+    _log.finest('Setup complete. Calling main entrypoint...');
+    await config.entrypoint(config.initialLocale);
+  }
+
+  @override
+  void setNotificationBody(String body) {
+    _api.setNotificationBody(body);
+  }
+}

lib/src/service/config.dart

@@ -0,0 +1,55 @@
+import 'dart:convert';
+import 'dart:ui';
+
+/// A function that can act as a service entrypoint.
+typedef EntrypointCallback = Future<void> Function(String initialLocale);
+
+/// A function that can be called when data is received.
+typedef HandleEventCallback = Future<void> Function(Map<String, dynamic>? data);
+
+/// Configuration that will be passed to the service's entrypoint
+class ServiceConfig {
+  const ServiceConfig(
+    this.entrypoint,
+    this.handleData,
+    this.initialLocale,
+  );
+
+  /// Reconstruct the configuration from a JSON string.
+  factory ServiceConfig.fromString(String rawData) {
+    final data = jsonDecode(rawData) as Map<String, dynamic>;
+    return ServiceConfig(
+      PluginUtilities.getCallbackFromHandle(
+        CallbackHandle.fromRawHandle(
+          data['entrypoint']! as int,
+        ),
+      )! as EntrypointCallback,
+      PluginUtilities.getCallbackFromHandle(
+        CallbackHandle.fromRawHandle(
+          data['handleData']! as int,
+        ),
+      )! as HandleEventCallback,
+      data['initialLocale']! as String,
+    );
+  }
+
+  /// The initial locale to use.
+  final String initialLocale;
+
+  /// The entrypoint to call into.
+  final EntrypointCallback entrypoint;
+
+  /// Entry function to call when the service receives data.
+  final HandleEventCallback handleData;
+
+  @override
+  String toString() {
+    return jsonEncode({
+      'entrypoint':
+          PluginUtilities.getCallbackHandle(entrypoint)!.toRawHandle(),
+      'handleData':
+          PluginUtilities.getCallbackHandle(handleData)!.toRawHandle(),
+      'initialLocale': initialLocale,
+    });
+  }
+}

lib/src/service/datasender/pigeon.dart

@@ -0,0 +1,15 @@
+import 'dart:convert';
+import 'package:moxlib/moxlib.dart';
+import 'package:moxxy_native/pigeon/service.g.dart';
+import 'package:moxxy_native/src/service/datasender/types.dart';
+
+class PigeonForegroundServiceDataSender
+    extends AwaitableDataSender<BackgroundCommand, BackgroundEvent> {
+  PigeonForegroundServiceDataSender(this._api);
+  final MoxxyServiceApi _api;
+
+  @override
+  Future<void> sendDataImpl(DataWrapper<JsonImplementation> data) {
+    return _api.sendData(jsonEncode(data.toJson()));
+  }
+}

lib/src/service/datasender/types.dart

@@ -0,0 +1,20 @@
+import 'dart:io';
+import 'package:moxlib/moxlib.dart';
+import 'package:moxxy_native/pigeon/service.g.dart';
+import 'package:moxxy_native/src/service/datasender/pigeon.dart';
+import 'package:moxxy_native/src/service/exceptions.dart';
+
+typedef ForegroundServiceDataSender
+    = AwaitableDataSender<BackgroundCommand, BackgroundEvent>;
+
+abstract class BackgroundCommand implements JsonImplementation {}
+
+abstract class BackgroundEvent implements JsonImplementation {}
+
+ForegroundServiceDataSender getForegroundDataSender(MoxxyServiceApi api) {
+  if (Platform.isAndroid) {
+    return PigeonForegroundServiceDataSender(api);
+  } else {
+    throw UnsupportedPlatformException();
+  }
+}

lib/src/service/entrypoints/pigeon.dart

@@ -1,10 +1,14 @@
 import 'package:flutter/cupertino.dart';
 import 'package:get_it/get_it.dart';
 import 'package:moxxy_native/pigeon/background_service.g.dart';
-import 'package:moxxy_native/src/service.dart';
+import 'package:moxxy_native/src/service/background/base.dart';
+import 'package:moxxy_native/src/service/background/pigeon.dart';
+import 'package:moxxy_native/src/service/config.dart';
 
+/// An entrypoint that should be used when the service runs
+/// in a new Flutter Engine.
 @pragma('vm:entry-point')
-Future<void> androidEntrypoint() async {
+Future<void> pigeonEntrypoint() async {
   // ignore: avoid_print
   print('androidEntrypoint: Called on new FlutterEngine');
 
@@ -15,7 +19,7 @@ Future<void> androidEntrypoint() async {
   );
 
   // Setup the background service
-  final srv = BackgroundService();
+  final srv = PigeonBackgroundService();
-  GetIt.I.registerSingleton(srv);
+  GetIt.I.registerSingleton<BackgroundService>(srv);
-  srv.init(config);
+  await srv.init(config);
 }

lib/src/service/exceptions.dart

@@ -0,0 +1,8 @@
+import 'dart:io';
+
+/// An exception representing that moxxy_native does not support the given platform.
+class UnsupportedPlatformException implements Exception {
+  UnsupportedPlatformException();
+
+  String get message => 'Unsupported platform "${Platform.operatingSystem}"';
+}

lib/src/service/foreground/base.dart

@@ -0,0 +1,49 @@
+import 'dart:io';
+import 'package:moxlib/moxlib.dart';
+import 'package:moxxy_native/src/service/config.dart';
+import 'package:moxxy_native/src/service/datasender/types.dart';
+import 'package:moxxy_native/src/service/exceptions.dart';
+import 'package:moxxy_native/src/service/foreground/pigeon.dart';
+
+/// Wrapper API that is only available to the UI isolate.
+// TODO(Unknown): Dumb naming. Name it something better
+abstract class ForegroundService {
+  /// Perform setup such that we [handleData] is called whenever the background service
+  /// sends data to the foreground.
+  Future<void> attach(HandleEventCallback handleData);
+
+  /// Start the background service with the config [config]. Additionally, perform
+  /// setup such that [uiHandleData] is called whenever the background service sends
+  /// data to the foreground.
+  Future<void> start(ServiceConfig config, HandleEventCallback uiHandleData);
+
+  /// Return true if the background service is running. False, if not.
+  Future<bool> isRunning();
+
+  /// Return the [AwaitableDataSender] that is used to send data to the background service.
+  ForegroundServiceDataSender getDataSender();
+
+  /// Convenience wrapper around getDataSender().sendData. The arguments are the same
+  /// as for [AwaitableDataSender].
+  Future<BackgroundEvent?> send(
+    BackgroundCommand command, {
+    bool awaitable = true,
+  });
+}
+
+/// "Singleton" ForegroundService instance to prevent having to type "GetIt.I.get<ForegroundService>()"
+ForegroundService? _service;
+
+/// Either returns or creates a [ForegroundService] object of the correct type for the
+/// current platform.
+ForegroundService getForegroundService() {
+  if (_service == null) {
+    if (Platform.isAndroid) {
+      _service = PigeonForegroundService();
+    } else {
+      throw UnsupportedPlatformException();
+    }
+  }
+
+  return _service!;
+}

lib/src/service/foreground/pigeon.dart

@@ -0,0 +1,82 @@
+import 'dart:convert';
+import 'dart:ui';
+import 'package:flutter/services.dart';
+import 'package:flutter/widgets.dart';
+import 'package:logging/logging.dart';
+import 'package:moxxy_native/pigeon/service.g.dart';
+import 'package:moxxy_native/src/service/config.dart';
+import 'package:moxxy_native/src/service/datasender/pigeon.dart';
+import 'package:moxxy_native/src/service/datasender/types.dart';
+import 'package:moxxy_native/src/service/entrypoints/pigeon.dart';
+import 'package:moxxy_native/src/service/foreground/base.dart';
+
+class PigeonForegroundService extends ForegroundService {
+  PigeonForegroundService() {
+    _dataSender = PigeonForegroundServiceDataSender(_api);
+  }
+
+  /// Pigeon channel to the native side.
+  final MoxxyServiceApi _api = MoxxyServiceApi();
+
+  /// A method channel for background service -> UI isolate communication.
+  final MethodChannel _channel =
+      const MethodChannel('org.moxxy.moxxy_native/foreground');
+
+  /// The data sender backing this class.
+  late final PigeonForegroundServiceDataSender _dataSender;
+
+  /// A logger.
+  final Logger _log = Logger('PigeonForegroundService');
+
+  @override
+  Future<void> attach(
+    HandleEventCallback handleData,
+  ) async {
+    _channel.setMethodCallHandler((call) async {
+      await handleData(
+        jsonDecode(call.arguments! as String) as Map<String, dynamic>,
+      );
+    });
+  }
+
+  @override
+  Future<void> start(
+    ServiceConfig config,
+    HandleEventCallback uiHandleData,
+  ) async {
+    await _api.configure(
+      PluginUtilities.getCallbackHandle(
+        pigeonEntrypoint,
+      )!
+          .toRawHandle(),
+      config.toString(),
+    );
+
+    // Prepare the method channel
+    await attach(uiHandleData);
+
+    // Start the service
+    await _api.start();
+    _log.finest('Background service started...');
+  }
+
+  @override
+  Future<bool> isRunning() async {
+    WidgetsFlutterBinding.ensureInitialized();
+    return _api.isRunning();
+  }
+
+  @override
+  ForegroundServiceDataSender getDataSender() => _dataSender;
+
+  @override
+  Future<BackgroundEvent?> send(
+    BackgroundCommand command, {
+    bool awaitable = true,
+  }) {
+    return _dataSender.sendData(
+      command,
+      awaitable: awaitable,
+    );
+  }
+}

pigeon/background_service.dart

@@ -10,11 +10,8 @@ import 'package:pigeon/pigeon.dart';
     ),
   ),
 )
-
 @HostApi()
 abstract class MoxxyBackgroundServiceApi {
-  int getHandler();
-
   String getExtraData();
 
   void setNotificationBody(String body);

pigeon/service.dart

@@ -10,7 +10,6 @@ import 'package:pigeon/pigeon.dart';
     ),
   ),
 )
-
 @HostApi()
 abstract class MoxxyServiceApi {
   void configure(int handle, String extraData);

scripts/lint.sh

@@ -0,0 +1,6 @@
+# Format and lint the Dart code
+dart format .
+flutter analyze
+
+# Format and lint the Kotlin code
+ktlint --disabled_rules=standard:package-name --format android/src/main/kotlin/org/moxxy/moxxy_native