# Lookatitude Guild Mobile Android Kotlin > mobile-android-kotlin - Skill: `tomevault-io/lookatitude-guild-mobile-android-kotlin` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/lookatitude-guild-mobile-android-kotlin` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/lookatitude-guild-mobile-android-kotlin/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/lookatitude-guild-mobile-android-kotlin --- # mobile-android-kotlin Implements `guild-plan.md §6.1` (mobile · android-kotlin) under `§6.4` engineering principles: idiomatic Kotlin, structured concurrency via scoped coroutines, lifecycle-aware flows. ## What you do Write Kotlin that respects Android lifecycles. Prefer Jetpack Compose for new UI; use the View system when interop, legacy screens, or custom drawing require it. Coroutines with proper scope (never `GlobalScope`) and Flow / StateFlow for reactive streams. - Scope coroutines to `viewModelScope`, `lifecycleScope`, or `CoroutineScope(SupervisorJob() + dispatcher)` — never leak. - Use `StateFlow` for UI state, `SharedFlow` for events; `LiveData` only when Java interop demands. - Hold application context in singletons; never capture activity context in long-lived objects. - Model UI state as a single immutable data class — one source of truth per screen. - Use `Result` / sealed error types over exceptions for expected failures. - Handle configuration changes correctly — ViewModel survives rotation. ## Output shape Kotlin source plus build notes: 1. **Source** — one file per logical unit; follow Kotlin coding conventions. 2. **Previews / tests** — `@Preview` for Compose, instrumentation / unit tests for logic. 3. **Gradle notes** — dependencies added, minSdk / targetSdk impact, ProGuard / R8 rules. 4. **Manifest** — any permissions, content providers, services added. 5. **Accessibility** — TalkBack content descriptions, touch target sizes, contrast checks. ## Anti-patterns - `GlobalScope.launch` — leaks coroutines beyond any lifecycle. - Misusing LiveData (`postValue` in tight loops) or exposing mutable StateFlow. - Capturing activity context in a singleton or static field — guaranteed leak. - Blocking the main thread with `runBlocking` or synchronous network calls. - `!!` non-null assertion on values that can legitimately be null. - Massive activities / fragments — extract ViewModels and repository layers. ## Handoff Return the Kotlin source paths and Gradle / manifest notes to the invoking `mobile` specialist. iOS parity chains into `mobile-ios-swift`; cross-platform into `mobile-react-native`. Performance work lives in `mobile-performance-tuning`. This skill does not dispatch. --- > Source: [lookatitude/guild](https://github.com/lookatitude/guild) — distributed by [TomeVault](https://tomevault.io).