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android-state

Configure ViewModel state emission with StateFlow, SharedFlow, and sealed UiState classes in Android. Use for state modeling and sharing policies; defer generic lifecycle collection, navigation-event plumbing, Hilt injection, test code, and configuration-change recipes to their specific skills.

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包含的文件(3)

  • SKILL.md1.8 KB
  • evals/evals.json3.1 KB
  • references/implementation.md1.8 KB

SKILL.md(原文)

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Android State Management

Priority: P0 (CRITICAL)

1. Structure ViewModel

  • Expose ONE StateFlow<UiState> via .asStateFlow().
  • Use viewModelScope for all coroutines.
  • Trigger initial load in init block.

See templates for ViewModel and UiState examples.

2. Define UI State (LCE Pattern)

  • Use sealed interface with Loading, Content, Error variants.
  • Mark data classes @Immutable.

See templates for sealed UiState pattern.

3. Collect State Lifecycle-Safely

  • Use collectAsStateWithLifecycle() in Compose.
  • Use SharingStarted.WhileSubscribed(5000) for shared resources.

Anti-Patterns

  • No LiveData for New Code: Use StateFlow — lifecycle-safe and Compose-compatible.
  • No Public MutableStateFlow: Expose only .asStateFlow() to consumers.
  • No Context in ViewModel: Leaks Activity. Use Application context if truly needed.

Verification

  • Each ViewModel exposes exactly one StateFlow<UiState>.
  • UiState is a sealed interface with Loading, Content, Error variants.
  • UI collects with collectAsStateWithLifecycle().
  • ./gradlew test passes for ViewModel tests.

References

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