Build and migrate Android apps with Kotlin, Jetpack Compose, MVVM, Hilt, Room 3 (KSP, SQLiteDriver, Flow/suspend DAOs), Navigation3, and multi-module Gradle. Use for new projects or modules, Compose screens and ViewModels, Room 3 and RemoteMediator, API 37 / targetSdk migration, Play Integrity clien

Android Kotlin Compose Development Context ladder (smaller load first; full references stay complete): 1. This file ( SKILL.md ) routing, stop rules, examples. 2. references/ quick.md when listed below required/forbidden + section links (~40 lines). 3. One target section in the full references/ .md code samples and checklists only. 4. [INDEX sections.md](references/INDEX sections.md) anchor dump only when quick routing is insufficient. Forbidden: load [INDEX sections.md](references/INDEX sections.md) or an entire multi thousand line reference when one section or a quick file covers the task. Route tasks through the Quick Reference table. When no row matches, or the task needs greenfield bootstrap: [workflows.md](references/workflows.md). Full file list: [INDEX.md](references/INDEX.md). Required: Existing project: read settings.gradle.kts , gradle/libs.versions.toml , and the app module build file before copying from assets/ [dependencies.md](references/dependencies.md existing project brownfield), [modularization.md](references/modularization.md existing project alignment). Stack migrations: [migration.md](references/migration.md). Greenfield: [workflows.md](references/workflows.md) → "Creating a new project?" After module, DI, navigation, Room schema, or AGP/Kotlin/KSP changes: ./gradlew help then :app:assembleDebug (use the real app module name) [gradle setup.md](references/gradle setup.md verify after toolchain or module changes). Outside repo stop rules (do not substitute repo edits): Play upload, tracks, rollout, versionCode [android ci cd.md](references/android ci cd.md); Play Integrity prerequisites (Console/Cloud setup) [android security quick.md](references/android security quick.md); production adb install / pm clear [testing.md](references/testing.md agent automation adb and uiautomator). Quick Reference Rare or niche topics not listed here are in [INDEX.md](references/INDEX.md) (complete file list). Task Reference Task not in table, greenfield bootstrap, multi topic setup [workflows.md](references/workflows.md) Full index of all reference files [INDEX.md](references/INDEX.md) Version catalog, pins, alpha policy, brownfield alignment [dependencies.md](references/dependencies.md version strategy) Adding or updating dependencies (catalog aliases) [dependencies.md](references/dependencies.md) Multi module dependencies [dependencies.md](references/dependencies.md) Project structure and modules [modularization.md](references/modularization.md) MVVM layers, repositories, DI [architecture.md](references/architecture.md) Retrofit / OkHttp, NetworkModule, nullable DTOs, AuthInterceptor [architecture.md](references/architecture.md network layer setup corenetwork); [dependencies.md](references/dependencies.md) DataStore (preferences, typed), Room vs DataStore rules [architecture.md](references/architecture.md datastore preferences typed) Code formatting (Spotless, spotlessCheck / spotlessApply ) [assets/convention/QUICK REFERENCE.md](assets/convention/QUICK REFERENCE.md spotless plugin); [gradle setup.md](references/gradle setup.md) Compose patterns, motion, animation, modifiers, stability [compose patterns quick.md](references/compose patterns quick.md) Paging 3 + Room + network ( RemoteMediator , remote keys, initialize ) [compose patterns.md](references/compose patterns.md offline first paging and remotemediator) Accessibility, TalkBack, label copy, live regions, Espresso a11y [android accessibility quick.md](references/android accessibility quick.md) Notifications, foreground services, MediaStyle, PiP, sharesheet [android notifications.md](references/android notifications.md) Media: API 37 background playback, Media3, picking, FileProvider, sharesheet [android media.md](references/android media.md) Data sync and offline first patterns [android data sync quick.md](references/android data sync quick.md) Material 3 theming, spacing tokens, dynamic colors [android theming quick.md](references/android theming quick.md) Navigation3, deep links, App Links, adaptive layouts [android navigation quick.md](references/android navigation quick.md) Kotlin patterns, View lifecycle interop [kotlin patterns.md](references/kotlin patterns.md) Coroutine patterns ( StateFlow , Channel , callbackFlow ) [coroutines patterns quick.md](references/coroutines patterns quick.md) Gradle, product flavors, BuildConfig, build performance, R8 [gradle setup.md](references/gradle setup.md) Code quality (Detekt convention plugin, CI) [code quality.md](references/code quality.md) Testing approach (unit, instrumented, Compose UI) [testing quick.md](references/testing quick.md) Internationalization and localization [android i18n.md](references/android i18n.md) Runtime permissions, Photo Picker, API 37 location privacy [android permissions.md](references/android permissions.md) Kotlin delegation patterns [kotlin delegation.md](references/kotlin delegation.md) Crash reporting (Firebase / Sentry interfaces, PII scrubbing) [crashlytics.md](references/crashlytics.md) Design patterns (GoF style, Room FTS) [design patterns quick.md](references/design patterns quick.md) Performance, Play Vitals, startup, recomposition, jank, APA, Perfetto [android performance.md](references/android performance.md) Debugging, Logcat, ANR, Gradle errors, R8 mapping, memory leaks [android debugging.md](references/android debugging.md)

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