# Android Engineering Core

> This skill is used to implement Android features within the existing Kotlin, Compose, Room, Hilt and Navigation architecture, including data, navigation and background work. Use when this capability is needed.

- Skill: `tomevault-io/android-engineering-core` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/android-engineering-core`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/android-engineering-core/raw
- Safety review: pending
- 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/android-engineering-core

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# Android Engineering and Core Implementation Skill

## Purpose
Implement the shaped and designed Android feature in the existing architecture, covering data persistence, business logic, navigation, reminders and background behaviour.

## When to Use
Use this skill once product shaping and UX design are complete and the UI structure is known.

## Outputs
- Updated Room entities, DAOs and migrations when required
- Repository and use-case logic
- ViewModel state and event handling
- Navigation wiring
- Integration with AlarmManager, notifications or other platform components

## Procedure
1. Confirm the slice fits within the current stack:
   - Kotlin, Coroutines and Flow
   - Room for local data
   - Hilt for dependency injection
   - Jetpack Navigation and Compose for UI
2. Apply the smallest data changes needed:
   - Adjust existing entities where possible.
   - Add new entities only when the UX slice truly demands it.
   - Create safe Room migrations for any schema changes.
3. Map user actions from the UX design to ViewModel events:
   - Define clear intent functions (for example onAddTask, onToggleComplete).
   - Keep side effects (saving, scheduling reminders) in the ViewModel or use-case layer, not in composables.
4. Implement repositories or use-cases:
   - Keep them focused on data and business logic.
   - Expose Flows or suspend functions as appropriate.
5. Wire navigation:
   - Add or adjust routes in the NavHost.
   - Pass arguments via navigation arguments and SavedStateHandle.
6. Integrate platform services carefully:
   - Use AlarmManager, Notifications and BroadcastReceivers for reminders when required.
   - Handle boot rescheduling if reminders depend on time.
   - Avoid new background frameworks unless necessary.

## Guardrails
- Do not change the overall architecture or introduce new frameworks.
- Do not move logic into composables.
- Do not add network sync, backends or multi-device features unless explicitly required by shaping.
- Prefer small, incremental changes over broad refactors.

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> Source: [polaralias/audio-focus](https://github.com/polaralias/audio-focus) — distributed by [TomeVault](https://tomevault.io).
<!-- tomevault:4.0:skill_md:2026-06-04 -->