Android Concurrency Standards
Priority: P0 (CRITICAL)
Implementation Guidelines
Structured Concurrency
- Scopes: Always use
viewModelScope (VM) or lifecycleScope (Activity/Fragment).
- Dispatchers: INJECT Dispatchers (
DispatcherProvider) for testability. not hardcode Dispatchers.IO.
Flow usage
- Cold Streams: Use
Flow for data streams.
- Hot Streams: Use
StateFlow (State) or SharedFlow (Events).
- Replay: Use
SharedFlow with replay only when late subscribers must receive recent events.
- Collection: Use
collectAsStateWithLifecycle() (Compose) or repeatOnLifecycle (Views).
Anti-Patterns
- No GlobalScope: Use viewModelScope or lifecycleScope — never GlobalScope.
- No async/await by default: Prefer simple suspend functions; async only for parallel calls.
References
Canonical response anchors
- Additional task-grounded exact anchors: hardcode
