claude-android-ninja
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 client wiring, offline-first sync, and version-catalog alignment. Not for iOS, Flutter, React Native, KMP-only shared code without an Android app module, or backend-only APIs with no Android client.
- Installs
- 617
- Last 24h
- +12
- Trending rank
- #7820
- Security
- Not audited
Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/drjacky/claude-android-ninja --skill claude-android-ninja- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads claude-android-ninja automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Android Kotlin Compose Development
Context ladder (smaller load first; full references stay complete):
- This file (
SKILL.md) - routing, stop rules, examples. references/*-quick.mdwhen listed below - required/forbidden + section links (~40 lines).- One target section in the full
references/*.md- code samples and checklists only. - INDEX-sections.md - anchor dump only when quick routing is insufficient.
Forbidden: load 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. Full file list: INDEX.md.
Required:
- Existing project: read
settings.gradle.kts,gradle/libs.versions.toml, and theappmodule build file before copying fromassets/- dependencies.md, modularization.md. Stack migrations: migration.md. - Greenfield: workflows.md → "Creating a new project?"
- After module, DI, navigation, Room schema, or AGP/Kotlin/KSP changes:
./gradlew helpthen:app:assembleDebug(use the real app module name) - gradle-setup.md.
Outside-repo stop rules (do not substitute repo edits): Play upload, tracks, rollout, versionCode - android-ci-cd.md; Play Integrity prerequisites (Console/Cloud setup) - android-security-quick.md; production adb install / pm clear - testing.md.
Quick Reference
Rare or niche topics not listed here are in INDEX.md (complete file list).
| Task | Reference |
|---|---|
| Task not in table, greenfield bootstrap, multi-topic setup | workflows.md |
| Optional Android CLI project discovery, Studio checks, preview, and test-device inspection | workflows.md ("Using the optional Android CLI for agent workflows?") |
| Full index of all reference files | INDEX.md |
| Version catalog, pins, alpha policy, brownfield alignment | dependencies.md |
| Adding or updating dependencies (catalog aliases) | dependencies.md |
| Multi-module dependencies | dependencies.md |
| Project structure and modules | modularization.md |
| MVVM layers, repositories, DI | architecture.md |
| Retrofit / OkHttp, NetworkModule, nullable DTOs, AuthInterceptor | architecture.md; dependencies.md |
| DataStore (preferences, typed), Room vs DataStore rules | architecture.md |
Code formatting (Spotless, spotlessCheck / spotlessApply) | assets/convention/QUICK_REFERENCE.md; gradle-setup.md |
| Compose patterns, motion, animation, modifiers, stability | compose-patterns-quick.md |
Paging 3 + Room + network (RemoteMediator, remote keys, initialize) | compose-patterns.md |
| Accessibility, TalkBack, label copy, live regions, Espresso a11y | android-accessibility-quick.md |
| Notifications, foreground services, MediaStyle, PiP, sharesheet | android-notifications.md |
| Media: API 37 background playback, Media3, picking, FileProvider, sharesheet | android-media.md |
| Data sync and offline-first patterns | android-data-sync-quick.md |
| Material 3 theming, spacing tokens, dynamic colors | android-theming-quick.md |
| Navigation3, deep links, App Links, adaptive layouts | android-navigation-quick.md |
| Kotlin patterns, View lifecycle interop | kotlin-patterns.md |
Coroutine patterns (StateFlow, Channel, callbackFlow) | coroutines-patterns-quick.md |
| Gradle, product flavors, BuildConfig, build performance, R8 | gradle-setup.md |
| Code quality (Detekt convention plugin, CI) | code-quality.md |
| Testing approach (unit, instrumented, Compose UI) | testing-quick.md |
| Internationalization and localization | android-i18n.md |
| Runtime permissions, Photo Picker, API 37 location privacy | android-permissions.md |
| Kotlin delegation patterns | kotlin-delegation.md |
| Crash reporting (Firebase / Sentry interfaces, PII scrubbing) | crashlytics.md |
| Design patterns (GoF-style, Room FTS) | design-patterns-quick.md |
| Performance, Play Vitals, startup, recomposition, jank, APA, Perfetto | android-performance.md |
| Android 17 QPR2 memory budgets on constrained devices (optional) | android-performance.md |
| Debugging, Logcat, ANR, Gradle errors, R8 mapping, memory leaks | android-debugging.md |
| Migrations (XML, RxJava, Navigation, Compose, Room 2→3, API 37, 16 KB native, Compose-XML interop) | migration.md; 16 KB page size; Compose-XML interop |
Examples
Greenfield Android app with convention plugins
User goal: new repo matching the skill stack.
Actions: copy assets/settings.gradle.kts.template, assets/libs.versions.toml.template, assets/convention/ into build-logic/ per assets/convention/QUICK_REFERENCE.md; wire includeBuild("build-logic"); read modularization.md and gradle-setup.md.
Result: root + app + core modules with version catalog and convention plugins applied.
New feature screen (Compose + ViewModel)
User goal: one new flow in a feature module.
Actions: modularization.md for module naming and dependency direction; compose-patterns-quick.md for Screen, state, effects; kotlin-patterns.md + coroutines-patterns-quick.md for StateFlow / events; architecture.md for domain vs data boundaries.
Result: feature module with Screen composable, ViewModel, UiState, and DI aligned to existing graphs.
Offline-first list with Room 3 and remote API
User goal: cached list + network refresh.
Actions: compose-patterns.md for Paging 3 + RemoteMediator; architecture.md for repository placement; Room 3 + SQLiteDriver per workflows.md (Working with databases) and migration.md if upgrading.
Result: single source of truth in Room, UI driven by PagingData or equivalent pattern from the guide.
Target SDK / compile SDK bump (e.g. API 37)
User goal: migrate toolchain and platform requirements.
Actions: walk migration.md; pin AGP/Kotlin/KSP using gradle-setup.md and dependencies.md; cross-check edge-to-edge, media, security per workflows.md (Migrating to target SDK 37).
Result: compileSdk / targetSdk raised with manifest, Gradle, and feature code adjusted per the migration doc.
Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Gradle sync fails, plugin not found, or version catalog errors | Missing google() / mavenCentral(), wrong plugin id, or catalog alias drift | gradle-setup.md; align with assets/libs.versions.toml.template when bootstrapping |
| KSP errors on Room, or Room 3 builder rejects missing driver | Room 3 (template 3.0.3) expects setDriver(BundledSQLiteDriver()) (or project equivalent) | migration.md; modularization.md; architecture.md |
Unresolved @TypeConverter, or a DAO return type is rejected | Room 3 renamed it to @ColumnTypeConverter; non-Flow/suspend return types need @DaoReturnTypeConverters | migration.md |
Release-only crash while the class is listed in seeds.txt | AGP 9 strictFullModeForKeepRules: -keep class A no longer keeps its constructor | android-debugging.md; gradle-setup.md |
| Gradle sync fails right after bumping Compose, nav3, or androidx.hilt | Those libraries compile against compileSdk 37 and require AGP >= 9.2.0 | migration.md; gradle-setup.md |
| LAN device discovery or a local HTTP call silently fails at target 37 | ACCESS_LOCAL_NETWORK is required, or use the permissionless NsdManager picker | android-permissions.md; migration.md |
| Background audio is silent with no exception | API 37 audio hardening - no MediaSession, or no mediaPlayback FGS | android-media.md |
| Compose runtime warnings about unstable / skippable recompositions | Unstable parameter types or state held incorrectly | compose-patterns-quick.md; android-performance.md; kotlin-patterns.md |
Release build crashes, ClassNotFoundException, or missing R8 rules | Shrinking removed reflective or JNI entry points | android-debugging.md; gradle-setup.md |
| ANR or jank claims without evidence | Main-thread or measurement assumptions | android-performance.md or Perfetto before architecture changes |
FAQ
What does the claude-android-ninja skill do?
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 client wiring, offline-first sync, and version-catalog alignment. Not for iOS, Flutter, React Native, KMP-only shared code without an Android app module, or backend-only APIs with no Android client.
How do I install claude-android-ninja?
Run npx skills add https://github.com/drjacky/claude-android-ninja --skill claude-android-ninja in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/claude-android-ninja/ (personal) or .claude/skills/claude-android-ninja/ (project).
Which AI agents can use claude-android-ninja?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is claude-android-ninja safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains claude-android-ninja?
It is published by drjacky in drjacky/claude-android-ninja. It has 617 recorded installs.
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