The Purpose of UseCase in Android Architecture
UseCase objects, placed in the Domain layer of modern Android architecture, encapsulate complex business logic that was previously crammed into ViewModels, thereby enforcing clean separation of concerns, adhering to the Single Responsibility Principle, and making the codebase clearer, more maintainable, and scalable.
The latest Android architecture guidelines introduce the Domain Layer (often translated as domain layer or network domain layer) and recommend using UseCase to encapsulate complex business logic.
Traditionally in MVVM architecture, we used ViewModel to handle business logic. As business scales up, ViewModels become increasingly bloated and responsibilities become unclear.
Clean Architecture's separation of concerns and Single Responsibility Principle (SRP) design principles have been widely recognized, so Android introduced the UseCase concept from Clean Architecture in its latest architecture.
ViewModel belongs to the UI layer and should focus on UI-related logic, while UseCase belongs to the Domain layer and should focus on business logic. This separation makes the architecture clearer and more maintainable.
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