CodexBloom - Programming Q&A Platform

Dart: implementing Dependency Injection in Flutter Using GetIt for Lazy Loading

👀 Views: 448 đŸ’Ŧ Answers: 1 📅 Created: 2025-07-24
flutter dependency-injection getit Dart

I'm not sure how to approach Quick question that's been bugging me - I'm stuck on something that should probably be simple. I'm working with a question with dependency injection in my Flutter app using the GetIt package. I want to lazily load my services, but it seems like my instances are being created at app startup rather than when they're actually needed. For context, I'm using GetIt version 7.2.0 and Flutter version 3.7.0. I set up my service registration like this: ```dart final getIt = GetIt.instance; void setup() { getIt.registerLazySingleton<MyService>(() => MyService()); } ``` Then, I'm trying to use it in my widget like this: ```dart class MyWidget extends StatelessWidget { @override Widget build(BuildContext context) { final myService = getIt<MyService>(); return Text(myService.getData()); } } ``` However, I'm noticing that when I run the app, `MyService` is instantiated immediately, which I confirmed by adding a print statement in its constructor. I expected it to be instantiated only when `getIt<MyService>()` is called for the first time. I've also tried using `registerFactory` instead of `registerLazySingleton`, but that resulted in a new instance being created every time I called `getIt<MyService>()`, which is not what I want either. I checked the documentation and even the examples provided, but I'm still unclear on how to achieve lazy loading effectively. Has anyone dealt with this scenario, or can someone explain what I might be doing wrong in the setup? Thanks in advance for your help! This issue appeared after updating to Dart 3.11. I'd love to hear your thoughts on this. The project is a REST API built with Dart.