🧑🏻‍💻 Summary

• UI Only
  • Good for very small, UI-contained logic.
  • No state preservation; everything resets on recomposition.
  • Simple one-time actions still work fine.
  • Weak testability and scalability.
  • Poor separation of concerns without ViewModel.
• StateFlow
  • Designed specifically for holding and exposing UI state.
  • Always provides the latest value after recomposition.
  • Not suitable for one-time events because old values persist.
  • Ideal for continuously changing UI states.
  • Assumes at least one active collector.
  • Ensures consistent UI across configuration changes.
• SharedFlow
  • Optimal for one-time UI events (Toast, Snackbar, Navigation).
  • replay = 0 + extraBufferCapacity = 1 helps prevent event loss.
  • Supports multiple collectors safely.
  • Not intended for state storage.
  • Standard modern pattern for UI event handling.
  • Robust against lifecycle situations where collectors appear/disappear.
• Channel
  • Best suited for FIFO, strictly ordered event delivery.
  • Should only have one collector (shared consumption is unsafe).
  • Ensures one-by-one processing with guaranteed order.
  • Less compatible with UI lifecycle due to collector timing issues.
  • Typically replaced by SharedFlow in UI-layer logic.
  • More appropriate for internal sequential pipelines rather than UI events.

👉 Why Kotlin Channels Are the Natural Solution for Preventing "Double Execution" of Events

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