Integrate ViewModel state with Views using Coroutines and Lifecycle on Android. Use when managing state with repeatOnLifecycle or lifecycle-aware coroutines in Fragment/Activity.
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---
name: android-legacy-state
description: Integrate ViewModel state with Views using Coroutines and Lifecycle on Android. Use when managing state with repeatOnLifecycle or lifecycle-aware coroutines in Fragment/Activity.
metadata:
triggers:
files:
- '**/*Fragment.kt'
- '**/*Activity.kt'
keywords:
- repeatOnLifecycle
- launchWhenStarted
---
# Android Legacy State Standards
## **Priority: P1**
## Implementation Guidelines
### Flow Consumption
- **Rule**: ALWAYS use `repeatOnLifecycle(Lifecycle.State.STARTED)` to collect flows in Views.
- **Why**: Prevents crashes (collecting while view destroyed) and saves resources (stops collecting in background).
### LiveData vs Flow
- **New Code**: Use `StateFlow` exclusively.
- **Legacy**: If using LiveData, observe with `viewLifecycleOwner` (Fragment), NOT `this`.
## Anti-Patterns
- **No launchWhenStarted/Resumed**: Deprecated. Use repeatOnLifecycle instead.
- **No observe(this) in Fragments**: Use viewLifecycleOwner to prevent lifecycle leaks.
## References
- [Flow Consumption Template](references/implementation.md)
