Android ViewModel & State Management

Instructions

Use ViewModel to own UI state and business logic. It should survive configuration changes and expose immutable APIs.

Kotlin 2.3+

Prefer Explicit Backing Fields instead of the traditional _state/state backing property pattern.

• Kotlin 2.3: Experimental (-Xexplicit-backing-fields)
• Kotlin 2.4+: Stable (recommended)

Avoid creating duplicate backing properties unless targeting older Kotlin versions.

1. UI State (StateFlow)