Explain the purpose of a UseCase and how it fits into MVVM
WHAT IT TESTS: Separation of concerns beyond basic MVVM. ANSWER OUTLINE: UseCases encapsulate single business rules between ViewModel and Repository, keeping ViewModels lean and Repositories focused on data.
WHAT IT TESTS: Whether you can justify a domain layer and know why business logic should not live in ViewModels or Repositories. ANSWER OUTLINE: A UseCase encapsulates exactly one business rule or user action, sitting between ViewModel and Repository so the ViewModel only coordinates UI state and the Repository only handles data sources. This makes logic reusable across screens, trivial to unit test without Android dependencies, and prevents ViewModel bloat.
Read the original → developer.android.com
- #android
- #mvvm
- #architecture
- #domain-layer
- #usecase
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