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name: android-legacy-state description: Integrate ViewModel state with XML Views using Coroutines and Lifecycle on Android. Use when managing state with repeatOnLifecycle or lifecycle-aware coroutines in Fragment/Activity; defer Compose state and generic Flow design to their specific skills. metadata: triggers: files: - '/*Fragment.kt' - '/*Activity.kt' keywords: - repeatOnLifecycle - launchWhenStarted

Android Legacy State Standards

Priority: P1 (HIGH)

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