Adding testing and fixes for android

Author: fhboswell

example/lib/main.dart

@@ -40,6 +40,12 @@ class _MyAppState extends State<MyApp>
     // NOTE: Replace with your own app ID from https://www.onesignal.com
     OneSignal.shared.initialize("77e32082-ea27-42e3-a898-c72e141824ef");
 
+    // AndroidOnly stat only
+    // OneSignal.Notifications.removeNotification(1);
+    // OneSignal.Notifications.removeGroupedNotifications("group5");
+
+    OneSignal.Notifications.clearAll();
+
     OneSignal.User.pushSubscription.addObserver(this);
     OneSignal.Notifications.addPermssionObserver(this);
 
@@ -194,10 +200,12 @@ class _MyAppState extends State<MyApp>
     print("Setting external user ID");
     if (_externalUserId == null) return;
     OneSignal.shared.login(_externalUserId!);
+    OneSignal.User.addAlias("fb_id", "1341524");
   }
 
   void _handleLogout() {
     OneSignal.shared.logout();
+    OneSignal.User.removeAlias("fb_id");
   }
 
   oneSignalInAppMessagingTriggerExamples() async {

ios/Classes/OneSignalPlugin.m

@@ -58,7 +58,8 @@ + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
 
     // TODO version
     [OneSignal setMSDKType:@"flutter"];
-
+    [OneSignal sdkVersion: @"050000"];
+    
     OneSignalPlugin.sharedInstance.channel = [FlutterMethodChannel
                                      methodChannelWithName:@"OneSignal"
                                      binaryMessenger:[registrar messenger]];

lib/src/notifications.dart

@@ -48,7 +48,7 @@ class OneSignalNotifications {
   /// Removes a grouped notification.
   Future<void> removeGroupedNotifications(String notificationGroup) async {
     if (Platform.isAndroid) {
-      return await _channel.invokeMethod("OneSignal#removeGroupedNotification",
+      return await _channel.invokeMethod("OneSignal#removeGroupedNotifications",
           {'notificationGroup': notificationGroup});
     }
   }

lib/src/user.dart

@@ -33,16 +33,16 @@ class OneSignalUser {
   ///
   /// If any alias already exists, it will be overwritten to the new values.
   Future<void> addAliases(Map<String, dynamic> aliases) async {
-    return await _channel.invokeMethod("OneSignal#addAlias", aliases);
+    return await _channel.invokeMethod("OneSignal#addAliases", aliases);
   }
 
   /// Remove an [alias] from the current user.
-  Future<void> removeAlias(String alias, dynamic id) async {
-    return await this.removeAliases({alias: id});
+  Future<void> removeAlias(String label) async {
+    return await this.removeAliases([label]);
   }
 
   /// Remove [aliases] from the current user.
-  Future<void> removeAliases(Map<String, dynamic> aliases) async {
+  Future<void> removeAliases(List<String> aliases) async {
     return await _channel.invokeMethod("OneSignal#removeAliases", aliases);
   }