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 : 2. Local Persistence (Room) Usage : Primary cache and offline storage. Entities : Define data classes. DAOs : Return for observable data. 3. Remote Data (Retrofit) Usage : Fetching data from backend. Response : Use functions in interfaces. Error Handling : Wrap network calls in blocks or a wrapper to handle exceptions (NoInternet, 404,…