Android Networking

Android networking is the single most common source of production bugs in mobile apps. Developers face a cascade of interconnected challenges: thread management on the main thread, token refresh race conditions, memory leaks from unclosed connections, inconsistent error handling across endpoints, certificate pinning failures after server upgrades, and caching strategies that either serve stale data or miss the cache entirely. The standard Retrofit + OkHttp stack is powerful but has a steep learning curve — most tutorials cover the happy path and leave developers to discover the failure modes in production. This skill encodes years of Android networking expertise into a structured, auditable system. It covers the full lifecycle: setup, interceptors, authentication flows, caching, error handling, WebSocket management, testing, and production monitoring.

What It Does

• Generates production-grade Retrofit service interfaces with coroutine support
• Builds OkHttp interceptor chains for auth, logging, caching, retry, and error transformation
• Implements token-based authentication with automatic refresh and race-condition protection
• Configures multi-layer caching (memory, disk, network) with invalidation strategies
• Provides unified error handling that maps HTTP errors to domain-specific sealed classes
• Generates WebSocket client code with reconnection logic and heartbeat management
• Creates mock interceptors for testing without network dependency
• Produces network monitoring and logging configurations for debugging and production
• Generates certificate pinning configurations with backup pin support
• Builds offline-first repository patterns with Room database integration
• Creates upload/download managers with progress tracking and resume support
• Generates pagination helpers for cursor-based and offset-based APIs

Use Cases

• E-commerce app — Product listing with offline browsing, cart sync, order tracking with WebSocket updates, image upload with progress
• Social media app — Feed with infinite scroll, real-time notifications via WebSocket, photo/video upload with resume, offline post queue
• Banking app — Secure API calls with certificate pinning, biometric token access, transaction history with offline cache, real-time balance updates
• Messaging app — WebSocket chat with reconnection, message queue for offline sends, attachment upload/download, read receipts
• Fitness tracker — Sync workout data to cloud, download training plans for offline use, real-time leaderboard updates, progress photo upload
• News reader — Offline article cache, background refresh, image download manager, paginated feed with prefetch