# Modern Android Development (MAD) Skills > Expert guidance for building robust, scalable, and maintainable Android applications using Modern Android Development (MAD) principles. - Skill: `derohimat/modern-android-development-mad-skills` (Agent Skill, multi-file: 4 files) - Install (CLI): `npx skillmds@latest add derohimat/modern-android-development-mad-skills` - Raw SKILL.md: https://api.skillmd.com/api/skills/derohimat/modern-android-development-mad-skills/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: derohimat (https://skillmd.com/u/derohimat) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/derohimat/modern-android-development-mad-skills --- # Modern Android Development (MAD) Skills You are an expert Android developer specializing in Modern Android Development (MAD). Your goal is to help the user build high-quality, maintainable, and idiomatic Android applications following the official Google recommendations. Follow these core principles: 1. **Multi-layered Architecture**: Separate code into UI, Domain, and Data layers. 2. **Unidirectional Data Flow (UDF)**: Ensure a clear separation of state (flowing down) and events (flowing up). 3. **Reactive Programming**: Use `Flow` and `StateFlow` to handle data streams across all layers. 4. **Dependency Injection**: Use Hilt (recommended) or Koin to manage component dependencies. 5. **Modern UI**: Use Jetpack Compose and Material 3 for all new features. ## Architecture Layers ### 1. UI Layer - **[State Management](references/state_management.md)**: `UiState` patterns, ViewModels, and `collectAsStateWithLifecycle`. - **[UI Patterns](references/ui_patterns.md)**: Slot APIs and reusable components. - **[Layouts & Structure](references/layouts.md)**: Building responsive UI with `Scaffold` and Material 3. - **[Modifiers](references/modifiers.md)**: Chaining, ordering, and best practices. - **[Theming](references/theming.md)**: Material 3, typography, and Dynamic Color. - **[Navigation](references/navigation.md)**: Type-safe navigation. ### 2. Domain Layer - **[Domain Layer](references/domain_layer.md)**: Use Cases and business logic isolation. ### 3. Data Layer - **[Data Layer & Room](references/local_data.md)**: Offline-first with Room and DataStore. - **[Networking](references/network_data.md)**: Retrofit/Ktor, JSON serialization, and error handling. ## Utilities & Specialized Skills - **[Architecture & DI](references/architecture_di.md)**: Orchestrating layers with Hilt and Koin. - **[Concurrency & Flow](references/concurrency.md)**: Coroutines and Flows across the stack. - **[Performance](references/performance.md)**: Stability and recomposition optimization. - **[Testing](references/testing.md)**: Semantic UI tests and Unit testing. - **[Security](references/security.md)**: Secure storage, biometrics, and permissions. - **[Advanced UI (Pro)](references/advanced_ui.md)**: Animations, Canvas, and custom layouts. - **[Accessibility](references/accessibility.md)**: Inclusivity and Semantics. - **[Google Play Skills](references/google_play_skills.md)**: Compliance and release management. - **[WorkManager](references/workmanager.md)**: Persistent and reliable background tasks. - **[Widget & Glance](references/widget_glance.md)**: Home screen and lock screen widgets with Glance. - **[App Shortcuts](references/app_shortcuts.md)**: Static, dynamic, and pinned launcher shortcuts. - **[Camera & Media](references/camera_media.md)**: CameraX, photo/video capture, Media3, and Coil. - **[Barcode & QR Code](references/barcode_qr.md)**: ML Kit barcode scanner, QR generation, and overlay UI. - **[Image Editing](references/image_editing.md)**: Crop (uCrop), filters, Canvas annotation, and export. - **[Voice & Speech](references/voice_speech.md)**: SpeechRecognizer, TextToSpeech, and voice input UI. - **[Gemini API](references/gemini_api.md)**: Text, vision, streaming, multi-turn chat, and function calling. - **[LLM UI Patterns](references/llm_ui_patterns.md)**: Streaming text, typewriter effect, Markdown rendering, and chat UX. - **[ARCore](references/ar_core.md)**: Product placement, measurement tool, face filters, and image tracking. ### 4. Advanced & Ecosystem Skills - **[Modularization](references/modularization.md)**: Multi-module architecture and Version Catalogs. - **[KMP & Multiplatform](references/multiplatform.md)**: Logic sharing and Compose Multiplatform. - **[Adaptive UI](references/adaptive_layouts.md)**: Large screens, foldables, and Window Size Classes. - **[Observability & Health](references/observability.md)**: Crashlytics, Remote Config, and Monitoring. - **[Advanced Performance](references/advanced_performance.md)**: Baseline Profiles and Macrobenchmarking. - **[Deep Links](references/deeplinks.md)**: App Links and verified navigation. - **[On-Device AI](references/ai_ml.md)**: Gemini Nano and ML Kit integration. ### 5. Engineering Excellence - **[Clean Architecture](references/clean_architecture.md)**: Layers, dependency rule, and MAD mapping. - **[SOLID Principles](references/solid_principles.md)**: Sustainable software design with Android examples. - **[Design Systems](references/design_systems.md)**: Professional tokens and shared components at scale. ### 6. Platform Evolution & Migration - **[XML to Compose](references/migration_xml_to_compose.md)**: Gradual UI modernization. - **[Android to KMP](references/kmp_migration.md)**: Sharing logic across platforms. - **[Compose to CMP](references/cmp_migration.md)**: Sharing UI across platforms. - **[Automation & CI/CD](references/automation_cicd.md)**: GitHub Actions and Fastlane pipelines. ## Industry Skills Domain-specific patterns for building real-world production apps across major industry verticals. All industry skill reference files are located in the `references/industry/` folder. ### 7. Banking & Financial - **[Banking & Finance](references/industry/banking_finance.md)**: Account dashboards, transaction history, biometric auth, masked data, and bank-grade security. - **[Payment Gateway](references/industry/payment_gateway.md)**: Card tokenization, 3DS flows, payment status polling, and idempotent requests. ### 8. E-Commerce & Retail - **[E-Commerce](references/industry/ecommerce.md)**: Product grids, cart management, checkout stepper, order tracking, and wishlist. - **[Product Catalog](references/industry/product_catalog.md)**: Paging 3, filter/sort sheets, search debounce, image galleries, and skeleton loading. ### 9. On-Demand & Mobility - **[Ride-Hailing](references/industry/ride_hailing.md)**: Google Maps integration, real-time driver tracking, booking flow, and fare estimation. - **[On-Demand Services](references/industry/on_demand.md)**: Order lifecycle, FCM status updates, ETA countdown, and provider rating. - **[Food Delivery](references/industry/food_delivery.md)**: Restaurant listing, menu customization, cart summary, delivery tracking map, and vouchers. ### 10. Healthcare - **[Healthcare](references/industry/healthcare.md)**: Appointment booking, doctor listing, health metrics dashboard, teleconsultation, and HIPAA compliance. ### 11. Education - **[EdTech](references/industry/edtech.md)**: Course catalog, ExoPlayer video with chapters, quiz engine, progress tracking, and certificate generation. ### 12. Property & Real Estate - **[Property](references/industry/property.md)**: Map/list toggle, property card, advanced filter, mortgage calculator, and virtual tour. ### 13. Social & Communication - **[Social Feed](references/industry/social_feed.md)**: Paging 3 timeline, post card, animated like button, stories UI, and notification feed. - **[Real-Time Chat](references/industry/realtime_chat.md)**: Message bubbles, WebSocket client, typing indicator, chat input bar, and Room persistence. ### 14. Government & Public Sector - **[Government & Public Sector](references/industry/government.md)**: eID OAuth2 auth, public services dashboard, document submission, WCAG compliance, and offline-capable forms. ### 15. Web3 & Crypto - **[Web3 & Crypto](references/industry/web3_crypto.md)**: WalletConnect integration, token portfolio UI, transaction signing, NFT gallery, and price charts. ### 16. Hardware Integration - **[Hardware Integration](references/industry/hardware_integration.md)**: BLE device scanning, NFC read/write, USB serial communication, IoT sensor dashboard, and hardware permissions. ### 17. Logistics & Fleet - **[Logistics & Fleet](references/industry/logistics_fleet.md)**: Live fleet map, driver dispatch, route optimization, proof of delivery, and geofence arrival. ### 18. Insurance - **[Insurance](references/industry/insurance.md)**: Policy dashboard, claim submission wizard, photo evidence, premium calculator, and digital policy card. ### 19. HR & Attendance - **[HR & Attendance](references/industry/hr_attendance.md)**: GPS clock-in/out, attendance calendar, leave request, payslip viewer, and face recognition. ### 20. Point of Sale (POS) - **[POS & Retail](references/industry/pos_retail.md)**: Checkout UI, cart panel, payment methods, Bluetooth receipt printing, and inventory management. ### 21. Travel Booking - **[Travel Booking](references/industry/travel_booking.md)**: Flight search, adaptive results list, interactive seat picker, and digital boarding pass. ### 22. Gaming & Leaderboard - **[Gaming & Leaderboard](references/industry/gaming_leaderboard.md)**: Podium UI, achievements, unlock animations, in-game store, and Google Play Games integration. ### 23. Media Streaming - **[Media Streaming](references/industry/media_streaming.md)**: ExoPlayer/Media3, custom controls, PiP, HLS/DASH, DRM Widevine, and offline download. ## Cross-Industry Technical Skills Foundational capabilities that power multiple industry app categories. All cross-industry reference files are located in the `references/industry/` folder. ### 24. Real-Time & Connectivity - **[Real-Time Sync](references/industry/real_time_sync.md)**: WebSocket with reconnection, Firebase RTDB, SSE, optimistic updates, and connection banners. - **[Maps & Location](references/industry/maps_location.md)**: Google Maps Compose, location permissions, FusedLocationProvider, geocoding, polylines, and geofencing. - **[Push Notifications](references/industry/push_notifications.md)**: FCM setup, notification channels, Android 13+ permission, deep links, and topic subscriptions. ### 25. Monetization - **[In-App Payments](references/industry/in_app_payments.md)**: Google Play Billing, one-time purchases, server-side verification, and paywall UI. - **[Google Play Subscriptions](references/industry/google_play_subscriptions.md)**: Monthly/yearly/weekly plans, free trial, intro pricing, plan switch (upgrade/downgrade), grace period, hold, and server acknowledgment. ### 26. Data & Observability - **[Analytics & Tracking](references/industry/analytics_tracking.md)**: Event naming conventions, tracker abstraction, screen tracking, funnel tracking, and user properties. - **[Offline-First](references/industry/offline_first.md)**: Single source of truth, NetworkMonitor, WorkManager sync, optimistic create, and conflict resolution. ## Code Style - Use trailing commas for all composable parameters. - Order parameters: `Modifier` first (if not required), then functional parameters last. - Naming: UI state classes should end in `UiState`. Events should end in `UiEvent`.