Standards for Coroutines, Flow, and Threading. Use when writing suspend functions, choosing coroutine scopes, switching between StateFlow and SharedFlow, injecting Dispatchers for testability, or debugging threading issues in Android. (triggers: **/*ViewModel.kt, **/*UseCase.kt, **/*Repository.kt, suspend, viewModelScope, lifecycleScope, Flow, coroutine, Dispatcher, DispatcherProvider, GlobalScope)
Scanned 5/30/2026
Install via CLI
Skills Directoryopenskills install ComeOnOliver/skillshub---
name: android-concurrency
description: "Standards for Coroutines, Flow, and Threading. Use when writing suspend functions, choosing coroutine scopes, switching between StateFlow and SharedFlow, injecting Dispatchers for testability, or debugging threading issues in Android. (triggers: **/*ViewModel.kt, **/*UseCase.kt, **/*Repository.kt, suspend, viewModelScope, lifecycleScope, Flow, coroutine, Dispatcher, DispatcherProvider, GlobalScope)"
---
# Android Concurrency Standards
## **Priority: P0**
## Implementation Guidelines
### Structured Concurrency
- **Scopes**: Always use `viewModelScope` (VM) or `lifecycleScope` (Activity/Fragment).
- **Dispatchers**: INJECT Dispatchers (`DispatcherProvider`) for testability. Do not hardcode `Dispatchers.IO`.
### Flow usage
- **Cold Streams**: Use `Flow` for data streams.
- **Hot Streams**: Use `StateFlow` (State) or `SharedFlow` (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
- [Dispatcher Pattern](references/implementation.md)
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