flutter-architecting-apps
Layered architecture framework for scalable Flutter apps with strict separation of concerns.
- Enforces three-layer structure (UI, Logic, Data) with unidirectional data flow and a single source of truth in the Data layer
- UI layer contains lean Views and ViewModels that transform domain models into presentation state; Logic layer (optional) handles complex business orchestration; Data layer divides strictly into stateless Services and caching Repositories
- Provides step-by-step feature implementation workflow from domain models through Services, Repositories, ViewModels, and Views, with validation via unit and widget tests
- Includes complete code examples demonstrating Service wrapping, Repository caching and transformation, ViewModel state management, and reactive View binding
Architecting Flutter Applications
Contents
- Core Architectural Principles
- Structuring the Layers
- Implementing the Data Layer
- Feature Implementation Workflow
- Examples
Core Architectural Principles
Design Flutter applications to scale by strictly adhering to the following principles:
- Enforce Separation of Concerns: Decouple UI rendering from business logic and data fetching. Organize the codebase into distinct layers (UI, Logic, Data) and further separate by feature within those layers.
- Maintain a Single Source of Truth (SSOT): Centralize application state and data in the Data layer. Ensure the SSOT is the only component authorized to mutate its respective data.
- Implement Unidirectional Data Flow (UDF): Flow state downwards from the Data layer to the UI layer. Flow events upwards from the UI layer to the Data layer.
- Treat UI as a Function of State: Drive the UI entirely via immutable state objects. Rebuild widgets reactively when the underlying state changes.
Structuring the Layers
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