android-platform-patterns - SKILL.md Agent Skill

name: android-platform-patterns description: 'Android platform/helper layer guide for AniTrend. Use when working in `:android:*` modules or deciding whether to reuse or extend existing Android-side helpers for configuration/theme, context or fragment utilities, notification permission flows, deep links, drawer/app-shell behavior, or other platform APIs.'

Skill: Android Platform Patterns

Overview

:android:* is AniTrend's platform/helper layer. It owns reusable Android-side APIs that should be shared across the app shell, feature modules, common presenters, and task modules instead of being recreated inside those entry layers.

Before adding a new helper, wrapper, extension, or provider, inspect the existing platform surfaces first:

:android:core for settings, configuration, theme, Compose primitives, controllers, helpers, and context/fragment utilities
:android:navigation for drawer and app-shell navigation content
:android:deeplink for URI entry, parser registration, and external-intent routing
:app:core for app-shell integration points that already consume those Android helpers

Use the concrete anchors in the layer example matrix when you need a real code path to copy.

Module roles

:android:core centralizes reusable Android-facing APIs such as Settings, ConfigurationHelper, AniTrendTheme3, notification helpers, storage/power/shortcut controllers, and fragment/context utilities.
:android:navigation owns the navigation drawer shell: fragment content, drawer presenter, viewmodels, adapters, and router provider wiring.
:android:deeplink owns external URI intake: DeepLinkScreen, parser assembly, route registration, and the provider that turns a URI into a routed intent.

Reuse-first workflow

Search android/core, android/navigation, android/deeplink, and app/core before creating anything new.
If an existing helper/controller/provider already models the behavior, extend that surface in place instead of cloning the API in feature, common, or task.
If the behavior is app-shell specific, inspect android/navigation/src/main/kotlin/co/anitrend/android/navigation/ and app/src/main/kotlin/co/anitrend/component/screen/MainScreen.kt.
If the behavior starts from an external URI, inspect android/deeplink before touching a feature module.
Only add a new internal API when reuse would break ownership boundaries or force an awkward abstraction that would require changing more than one existing public interface in the platform layer or would force a dependency that the consuming module is not allowed to take.

Decision rules

Apply the Reuse-first workflow first. The decision rules below are the constraints that govern the workflow steps.

Do not recreate context or fragment lookup helpers if android/core/src/main/kotlin/co/anitrend/android/core/extensions/ContextExtensions.kt or app/core/src/main/kotlin/co/anitrend/core/ui/UiExtensions.kt already covers the call pattern.
Do not recreate theme or configuration wiring if ConfigurationHelper, ThemeHelper, or AniTrendTheme3 already owns it.
Do not recreate notification permission or settings flows if NotificationHelper or NotificationExtensions.kt already models the behavior.
Do not bypass router and provider contracts with direct intent construction when :app:navigation, :android:navigation, or :android:deeplink already owns the route.
Keep platform-wide helpers in :android:*; keep feature-specific logic in the owning feature.
If an existing helper/controller/provider already covers the required behavior without changing any existing method signatures or callers, extend that surface in place instead of cloning the API in feature, common, or task.

Canonical files

android/core/src/main/kotlin/co/anitrend/android/core/koin/Modules.kt
android/core/src/main/kotlin/co/anitrend/android/core/settings/helper/config/ConfigurationHelper.kt
android/core/src/main/kotlin/co/anitrend/android/core/extensions/ContextExtensions.kt
android/core/src/main/kotlin/co/anitrend/android/core/helpers/notification/NotificationExtensions.kt
android/core/src/main/kotlin/co/anitrend/android/core/ui/theme/Theme.kt
android/navigation/src/main/kotlin/co/anitrend/android/navigation/drawer/koin/Modules.kt
android/navigation/src/main/kotlin/co/anitrend/android/navigation/drawer/provider/FeatureProvider.kt
android/deeplink/src/main/kotlin/co/anitrend/android/deeplink/koin/Modules.kt
android/deeplink/src/main/kotlin/co/anitrend/android/deeplink/component/screen/DeepLinkScreen.kt
android/deeplink/src/main/kotlin/co/anitrend/android/deeplink/provider/FeatureProvider.kt
app/core/src/main/kotlin/co/anitrend/core/koin/Modules.kt
app/core/src/main/kotlin/co/anitrend/core/ui/UiExtensions.kt
app/src/main/kotlin/co/anitrend/component/screen/MainScreen.kt