getBadgeCount method
Gets the current badge count from the app icon.
Returns 0
if the platform is not Android or iOS,
or if badge count is not supported.
Implementation
@override
Future<int?> getBadgeCount() async {
if (!Platform.isAndroid && !Platform.isIOS) return 0;
final result = await methodChannel.invokeMethod<int>('getBadgeCount');
return result;
}