import 'package:gravity_engine/gravity_engine.dart'; class GravityHelper { static init() { GravityEngine.initialize( "appid","3q4k1zgleJpExobevRf0c6G2Owb5nIas", "test", "test", true) .then((isAttributed) { print("isAttributed: $isAttributed"); }).catchError((error) { print("error: $error"); }); } }