android-coroutines-expert

What problem does it solve?

Android apps often struggle with lifecycle-unsafe coroutine usage, leading to leaks, crashes, or unresponsive UI. This guide delivers practical patterns to write lifecycle-aware, testable coroutine code using viewModelScope, proper Dispatchers, Flow in Compose, and robust error handling.

Core Features & Use Cases

• ViewModel-scoped coroutines with viewModelScope for lifecycle safety across config changes.
• Dispatcher guidance for Main, IO, and Default to optimize UI responsiveness and background work.
• Flow collection in Compose with collectAsStateWithLifecycle for safe UI state exposure.
• LaunchedEffect and side-effect handling for one-time or key-based actions.
• Managing long-running jobs with cancellation and proper cleanup.
• Testing strategies with TestDispatcher, runTest, and Turbine for Flow emissions.
• Anti-patterns to avoid, including GlobalScope, blocking Main thread, and unchecked exceptions.

Quick Start

Refactor a sample Android ViewModel to use viewModelScope, the correct Dispatchers, and collectAsStateWithLifecycle for Compose to improve lifecycle safety and testability.