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android-legacy-state

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.

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  • SKILL.md1.2 KB
  • evals/evals.json3.2 KB
  • references/implementation.md656 B

SKILL.md (original)

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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

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