dependencies:
  flutter_app_update: ^latest_version

 UpdateModel model = UpdateModel(
   url,
   "flutterUpdate.apk",
   /// android res/mipmap icon name
   "ic_launcher",
   'https://itunes.apple.com/cn/app/xxxx',
 );
 AzhonAppUpdate.update(model).then((value) => debugPrint('$value'));

@override
void initState() {
  super.initState();
  AzhonAppUpdate.listener((ResultModel model) {
    debugPrint('$model');
  });
}