◆ Sparround

Architecture & patterns

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MVVM/MVI comparisons, Jetpack architecture components, DI, Clean Architecture and where GoF patterns live in Android.

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1. MVC vs MVP vs MVVM vs MVI

architecturetheory
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2. ViewModel, LiveData vs StateFlow, lifecycle-aware components

architecturejetpack
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3. Dependency Injection: Hilt, Dagger, Koin

architecturedi
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4. Clean Architecture & the Repository pattern

architecture
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5. GoF design patterns in Android

patternstheory

🎯 Stage assignment

Stage project — "build one screen properly" (3-4 hours).

Write an accounts-list screen from scratch with MVVM + Clean layers:

  • domain: the Account model, the AccountRepository interface, one use case. No Android imports in this package.
  • data: AccountRepositoryImpl (fake data for now), an AccountDto → Account mapper.
  • presentation: a @HiltViewModel + a single UiState data class + a StateFlow.
  • Wire up the Hilt module and verify the difference between @Singleton and an unscoped binding.
  • Write at least 2 unit tests with a FakeAccountRepository: the success and error paths.

Done when: the tests pass without an emulator (on the JVM) — the simplest proof the architecture is right.