Added: platform service

Author: we-md-s001

assets/env/develop.json

@@ -17,5 +17,6 @@
   "one_signal_config": null,
   "pusher_config": null,
   "show_debug_panel": true,
+  "method_channel_name": "",
   "debug_panel_color": 3422552064
-}
+}

assets/env/production.json

@@ -17,5 +17,6 @@
   "one_signal_config": null,
   "pusher_config": null,
   "show_debug_panel": false,
+  "method_channel_name": "",
   "debug_panel_color": 3422552064
-}
+}

assets/env/staging.json

@@ -17,5 +17,6 @@
   "one_signal_config": null,
   "pusher_config": null,
   "show_debug_panel": true,
+  "method_channel_name": "",
   "debug_panel_color": 3422552064
-}
+}

lib/vaahextendflutter/env/env.dart

@@ -58,6 +58,7 @@ class EnvironmentConfig {
     this.oneSignalConfig,
     this.pusherConfig,
     required this.showDebugPanel,
+    required this.methodChannelName,
     required this.debugPanelColor,
   });
 
@@ -78,6 +79,7 @@ class EnvironmentConfig {
   final OneSignalConfig? oneSignalConfig;
   final PusherConfig? pusherConfig;
   final bool showDebugPanel;
+  final String methodChannelName;
   @JsonKey(fromJson: _colorFromJson, toJson: _colorToJson)
   final Color debugPanelColor;
 
@@ -119,6 +121,7 @@ class EnvironmentConfig {
       pushNotificationsServiceType: PushNotificationsServiceType.none,
       internalNotificationsServiceType: InternalNotificationsServiceType.none,
       showDebugPanel: true,
+      methodChannelName: '',
       debugPanelColor: Colors.black.withOpacity(0.8),
     );
   }

lib/vaahextendflutter/env/env.g.dart

@@ -0,0 +1,51 @@
+import 'package:flutter/foundation.dart';
+
+import 'services/base_service.dart';
+import 'services/platform_channel_service.dart';
+
+BasePlatformService get service {
+  return PlatformChannelService();
+}
+
+abstract class PlatformService {
+  static final BasePlatformService _service = service;
+
+  /// Invokes a [method] with or without [arguments] present at the native side.
+  ///
+  /// Returns a [Future] which completes to one of the following:
+  ///
+  /// * on successful invocation, a result (possibly null),
+  /// * if the invocation failed in the platform plugin, a [PlatformException],
+  /// * if the method has not been implemented by a platform plugin, a [MissingPluginException].
+  ///
+  /// Example:
+  /// ```dart
+  /// final int sum = await PlatformService.invokeMethod<int>('getSum', {'a': 10, 'b': 20});
+  /// print(sum); // 30
+  /// ```
+  static Future<T?> invokeMethod<T>(String method, [dynamic arguments]) {
+    return _service.invokeMethod<T>(method, arguments);
+  }
+
+  /// Sets up a [Stream] using the [eventChannelName] with or without [argumetns].
+  ///
+  /// Returns a broadcast [Stream] which emits events to listeners as follows:
+  ///
+  /// * for every successfull event, a decoded data event (possibly null) is received from the
+  ///   platform plugin;
+  /// * for every error event, an error event containing a [PlatformException]
+  ///   received from the platform plugin.
+  ///
+  /// When a stream is activated or deactivated, errors that happen are reported using the
+  /// [FlutterError] capability. Only when the number of stream listeners increases from 0 to 1 does
+  /// the stream become active. Deactivation of the stream only occurs when the number of stream
+  /// listeners drops to zero.
+  ///
+  /// Example:
+  /// ```dart
+  /// final myStream = PlatformService.getEventStream('com.example.app/battery');
+  /// ```
+  static Stream<dynamic> getEventStream(String eventChannelName, [dynamic arguments]) {
+    return _service.getEventStream(eventChannelName, arguments);
+  }
+}

lib/vaahextendflutter/services/platform_service/platform_service.dart

@@ -0,0 +1,4 @@
+abstract class BasePlatformService {
+  Future<T?> invokeMethod<T>(String method, [dynamic arguments]);
+  Stream<dynamic> getEventStream(String eventChannelName, [dynamic arguments]);
+}

lib/vaahextendflutter/services/platform_service/services/base_service.dart

@@ -0,0 +1,35 @@
+import 'package:flutter/services.dart';
+
+import '../../../env/env.dart';
+import 'base_service.dart';
+
+class PlatformChannelService implements BasePlatformService {
+  final String _methodChannelName = EnvironmentConfig.getConfig.methodChannelName;
+  static final Map<String, EventChannel> _eventChannels = {};
+
+  @override
+  Future<T?> invokeMethod<T>(String method, [dynamic arguments]) async {
+    final MethodChannel channel = MethodChannel(_methodChannelName);
+    try {
+      final result = await channel.invokeMethod<T>(method, arguments);
+      return result;
+    } on MissingPluginException catch (e) {
+      if (channel.name.isEmpty) {
+        throw 'Please provide correct method_channel_name in env config: ${e.message}';
+      }
+      throw 'No plugin handler for the method call was found: ${e.message}(${channel.name})';
+    } on PlatformException catch (e) {
+      throw 'Failed to invoke method: ${e.message}';
+    } on Exception catch (_) {
+      rethrow;
+    }
+  }
+
+  @override
+  Stream<dynamic> getEventStream(String eventChannelName, [dynamic arguments]) {
+    if (!_eventChannels.containsKey(eventChannelName)) {
+      _eventChannels[eventChannelName] = EventChannel(eventChannelName);
+    }
+    return _eventChannels[eventChannelName]!.receiveBroadcastStream(arguments);
+  }
+}