Question 1

How do I structure a Flutter app with clean architecture?

Accepted Answer

Divide the app into UI, Domain, and Data layers. Use MVVM in the UI layer with ChangeNotifier ViewModels, Repositories as the single source of truth in the Data layer, and optional Use Case classes for complex business logic between them.

Question 2

What is the Repository pattern in Flutter?

Accepted Answer

A Repository consumes one or more Services, transforms raw API models into clean domain models, and handles caching, offline sync, and retries. It exposes domain models to ViewModels, isolating data access logic from the rest of the app.

Question 3

When should I add a Domain layer with Use Cases in Flutter?

Accepted Answer

Add Use Case classes only when business logic is complex enough to clutter the ViewModel or must be reused across multiple ViewModels. For simple CRUD features, skip the Domain layer and let ViewModels call Repositories directly.

Question 4

How do I connect a Flutter ViewModel to a widget?

Accepted Answer

Extend ChangeNotifier in the ViewModel and expose immutable state getters. In the View, wrap the widget tree in ListenableBuilder or AnimatedBuilder listening to the ViewModel, and call notifyListeners after state changes.

Question 5

Which dependency injection approach does this Flutter architecture use?

Accepted Answer

Repositories and Use Cases are injected into ViewModels via constructors, and Services, Repositories, and ViewModels are registered in a dependency injection container such as provider or get_it during feature setup.

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