Android Data Layer

Android Data Layer & Offline-First

Instructions

The Data Layer coordinates data from multiple sources.

1. Repository Pattern

• Role: Single Source of Truth (SSOT).
• Logic: The repository decides whether to return cached data or fetch fresh data.
• Implementation:
  kotlin

  class NewsRepository @Inject constructor(    private val newsDao: NewsDao,    private val newsApi: NewsApi) {    // Expose data from Local DB as the source of truth    val newsStream: Flow<List<News>> = newsDao.getAllNews()
      // Sync operation    suspend fun refreshNews() {        val remoteNews = newsApi.fetchLatest()        newsDao.insertAll(remoteNews)    }}

2. Local Persistence (Room)

• Usage: Primary cache and offline storage.
• Entities: Define @Entity data classes.
• DAOs: Return Flow<T> for observable data.

3. Remote Data (Retrofit)

• Usage: Fetching data from backend.
• Response: Use suspend functions in interfaces.
• Error Handling: Wrap network calls in try-catch blocks or a Result wrapper to handle exceptions (NoInternet, 404, etc.) gracefully.

4. Synchronization

• Read: "Stale-While-Revalidate". Show local data immediately, trigger a background refresh.
• Write: "Outbox Pattern" (Advanced). Save local change immediately, mark as "unsynced", use WorkManager to push changes to server.

5. Dependency Injection

• Bind Repository interfaces to implementations in a Hilt Module.
  kotlin

  @Bindsabstract fun bindNewsRepository(impl: OfflineFirstNewsRepository): NewsRepository