skills/ HoangNguyen0403/agent-skills-standard

android-persistence

Implement Room schemas and DataStore preferences with proper async patterns in Android. Use when the primary task is storage schema, DAO, migration, or preference isolation; defer auth-token/security storage, any CoroutineWorker/WorkManager task, Hilt graph wiring, and cache-policy design.

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Android Persistence Standards

Priority: P0 (CRITICAL)

1. Configure Room Database

  • Return Flow<List<T>> for queries, use suspend for Write/Insert.
  • Keep @Entity data classes simple. Map to Domain models in Repository.
  • Use @Transaction for multi-table queries (Relations).

See DAO templates for Room DAO patterns.

2. Migrate to DataStore

  • Replace SharedPreferences with ProtoDataStore (type-safe) or PreferencesDataStore.
  • Inject singleton DataStore instance via Hilt.

See DAO templates for DataStore migration patterns.

Anti-Patterns

  • No IO on Main Thread: Room handles dispatchers, but verify Flow collected off-main.
  • No @Entity in UI Layer: Map to Domain or UI models in Repository.

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