A guide to building Android apps, including native Kotlin and Java apps as well as cross-platform options such as Flutter and React Native. It covers architecture, user interfaces, testing, error handling, releases, performance, and debugging.

Use it to choose a technology stack, structure an app, build screens, plan tests, configure builds and releases, investigate crashes, or improve performance.

It brings the main Android development decisions and maintenance tasks into one development guide.

android-dev — Skill for Claude Code by sickn33: A guide to building Android apps, including native Kotlin…

About the project

AAS Core is a local control plane for coding agents that lets them search a large catalogue of skills, choose a stack, validate it, and create a reproducible plan. It is used to assemble and review agent workflows through its CLI, local MCP server, catalogue, plugins, and Workbench. The catalogue add-ons provide the skills, plugins, bundles, and workflows that AAS Core helps agents select and validate.

sickn33/agentic-awesome-skills · 46,028 stars · on GitHub · sickn33.github.io

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/sickn33/agentic-awesome-skills/android-dev

Any agent

npx skills add sickn33/agentic-awesome-skills --skill android-dev

Clone the repo

git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills

Made for: Claude Code.

Or install agentic-awesome-skills, the plugin that ships this one along with the rest of its 196 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sickn33/agentic-awesome-skills/android-dev.svg)](https://agentmods.dev/skills/sickn33/agentic-awesome-skills/android-dev)

Your own site

<a href="https://agentmods.dev/skills/sickn33/agentic-awesome-skills/android-dev"><img src="https://agentmods.dev/badge/skills/sickn33/agentic-awesome-skills/android-dev.svg" alt="Measured on agentmods" height="20"></a>

Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 5,252 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00031	$0.05252
Opus 5	$0.00015	$0.02626
Sonnet 5	$0.00006	$0.01050
Haiku 4.5	$0.00003	$0.00525

Measured yesterday against content hash 5d26aea482f9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

android-dev scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

6 near-identical copies found in the catalogue:

android-dev — 100% identical, 0 lines differ
android-dev — 100% identical, 0 lines differ
android-dev — 100% identical, 0 lines differ
android-dev — 100% identical, 0 lines differ
android-dev — 100% identical, 0 lines differ
android-dev — 100% identical, 0 lines differ

plugins/agentic-awesome-skills-claude/skills/android-dev/SKILL.md · 525 lines

How it starts

The opening of the file, as written. The whole thing — 525 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Android App Development Skill

Overview

This skill guides production-grade Android and cross-platform (non-iOS) app development following practices used at big tech companies. It covers the entire development lifecycle — architecture, UI, code quality, testing, error handling, release, and maintenance.

When to Use This Skill

Use when deciding on a tech stack (see §1 Stack Selection)
Use when setting up project architecture (see §2 Architecture)
Use when designing UI, screens, or a design system (see §3 UI & Design)
Use when ensuring code quality, patterns, or APIs (see Best Practices)
Use when implementing error handling or debugging crashes (see §5 Error Handling)
Use when planning testing strategy (see §6 Testing)
Use when configuring build, CI/CD, or release pipelines (see §7 Build & Release)
Use when optimizing performance or memory (see §8 Performance)
Use when debugging or fixing bugs (see §9 Debugging)
Use when following the full development roadmap (see §10 Development Roadmap)
Use when needing deep reference for a stack (see references/ directory)

§1 Stack Selection

Choose based on team, requirements, and platform targets. Do not recommend iOS-specific paths.

Native Android — Kotlin + Jetpack Compose

Best for: Android-only apps, hardware-intensive features, best-in-class UX, new projects.

Language: Kotlin
UI: Jetpack Compose (modern declarative UI)
Key libs: Room, Retrofit/Ktor, Hilt, WorkManager, DataStore, Navigation Compose
Reference: references/native-android.md

Native Android — Java + XML Views

Best for: Existing Java codebases, teams without Kotlin experience, legacy app maintenance, incremental Kotlin migration.

Language: Java (fully supported by Google, not deprecated)
UI: XML Layouts (ConstraintLayout, RecyclerView, ViewBinding)
Key libs: Room, Retrofit, Hilt, WorkManager, LiveData, ViewModel
Java and Kotlin coexist seamlessly in the same project — migrate incrementally
Reference: references/java-android.md

Read the full file on GitHub · 525 lines

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 525 lines · 31 tokens per session scan A 5d26aea482f9

Subscribe to this mod's changes

android-dev is a skill published in the GitHub repository sickn33/agentic-awesome-skills (46,028 stars, last pushed today), licensed MIT. It adds 31 tokens to every session and 5,252 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-05.

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