android-coroutines-flow

Android Coroutines Flow

When To Use

• Use this skill when the request is about: android flow collection, fix coroutine scope in android, structured concurrency in viewmodel.
• Primary outcome: Use coroutines, Flow, structured concurrency, dispatchers, and cancellation-safe Android async pipelines.
• Handoff skills when the scope expands:
• android-state-management
• android-workmanager-notifications

Workflow

1. Map the request to the current Android stack, module boundaries, and minimum supported API level.
2. Inspect the existing implementation for implicit assumptions, duplicate helpers, and outdated patterns.
3. Apply the smallest change that improves correctness, readability, and long-term maintainability.
4. Validate the result against the relevant showcase app path and repo benchmarks.
5. Hand off adjacent work to the next specialized skill only after the core foundation is stable.

Guardrails

• Prefer official Android and Kotlin guidance over custom local conventions when they conflict.
• Keep public APIs boring and explicit; avoid clever abstractions that hide Android lifecycle costs.
• Do not mix architectural cleanup with product behavior changes unless the request explicitly needs both.
• Document any compatibility constraints that will affect old modules or generated code.

Anti-Patterns

• Sprinkling helpers across modules without a clear ownership boundary.
• Introducing framework-specific code into pure domain or data layers.
• Refactoring every adjacent file when only one contract needed to change.
• Leaving migration notes implied instead of writing them down.

Remediation Examples

Inject dispatchers instead of hard-coding them

class TaskRepository(
    private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO,
) {
    suspend fun refresh(): List<TaskUiModel> = withContext(ioDispatcher) { loadTasks() }
}

Collect flows with lifecycle awareness

viewLifecycleOwner.lifecycleScope.launch {
    viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
        viewModel.uiState.collect { render(it) }
    }
}