flutter-architecture

Flutter MVVM architecture separates UI, domain, and data layers by enforcing a View to ViewModel to Repository data flow using ChangeNotifier ViewModels and ListenableBuilder views. This unidirectional flow eliminates ad-hoc code organization and reduces coupling between UI and data sources.

Handle API errors and offline caching in Flutter by using Repositories as the single source of truth. Repositories catch stateless service exceptions and return Result objects, ensuring clear error handling and data merging without tightly coupling I/O operations to the UI.

Wire dependency injection in a Flutter MVVM project using the provider package. You connect stateless services, repositories returning Result objects, and ChangeNotifier-based ViewModels to ListenableBuilder views through provider, enforcing strict separation of concerns.

This Flutter architecture supports complex business logic through an optional Domain layer with UseCases. This allows you to manage multi-repository data merging and intricate rules while maintaining immutable domain models and stateless services.

Use ChangeNotifier and ListenableBuilder for Flutter state management to enforce unidirectional data flow. ViewModels propagate state to views via ListenableBuilder, ensuring the UI remains reactive and decoupled from data sources.

Use immutable domain models in Flutter app development when building scalable features that require strict separation between UI, domain, and data layers. This ensures reliable state propagation and makes the application easier to test, extend, and reason about.