Implementing Modern Android Architecture

on YouTube ↗45m

" summary

Concrete implementation of the Now in Android open‑source app demonstrates a layered UI/domain/data architecture with repositories, Room as the local single source of truth, and Flow/StateFlow for reactive streams. UI state is composed by combining flows and exposed via stateIn with whileSubscribed(5s) to free resources; the UI collects it with collectAsStateWithLifecycle. ViewModels hold business logic and screen state, plain stateholder classes hold UI logic and hoisted element state; user-facing events are modeled as state (nullable userMessage) and acknowledged by the UI.

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" chapters (9)

1. 0:00Welcome and intro
2. 1:54Why architecture matters
3. 6:50Core architecture principles
4. 13:50Layered architecture overview
5. 17:23Data layer implementation
6. 20:11UI layer and state management
7. 24:07UI logic and state at scale
8. 35:01Handling UI events
9. 43:07Domain layer and closing

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