android-kotlin-development

SKILL.md

Android Kotlin Development

Table of Contents

Overview

When to Use

Quick Start

Reference Guides

Best Practices

Overview

Build robust native Android applications using Kotlin with modern architecture patterns, Jetpack libraries, and Compose for declarative UI.

When to Use

Creating native Android applications with best practices

Using Kotlin for type-safe development

Implementing MVVM architecture with Jetpack

Building modern UIs with Jetpack Compose

Integrating with Android platform APIs

Quick Start

Minimal working example:

// Models
data class User(
  val id: String,
  val name: String,
  val email: String,
  val avatarUrl: String? = null
)

data class Item(
  val id: String,
  val title: String,
  val description: String,
  val imageUrl: String? = null,
  val price: Double
)

// API Service with Retrofit
interface ApiService {
  @GET("/users/{id}")
  suspend fun getUser(@Path("id") userId: String): User

  @PUT("/users/{id}")
  suspend fun updateUser(
    @Path("id") userId: String,
    @Body user: User
// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the references/ directory:

Guide
Contents

Models & API Service
Models & API Service

MVVM ViewModels with Jetpack
MVVM ViewModels with Jetpack

Jetpack Compose UI
Jetpack Compose UI

Best Practices

✅ DO

Use Kotlin for all new Android code

Implement MVVM with Jetpack libraries

Use Jetpack Compose for UI development

Leverage coroutines for async operations

Use Room for local data persistence

Implement proper error handling

Use Hilt for dependency injection

Use StateFlow for reactive state

Test on multiple device types

Follow Android design guidelines

❌ DON'T

Store tokens in SharedPreferences

Make network calls on main thread

Ignore lifecycle management

Skip null safety checks

Hardcode strings and resources

Ignore configuration changes

Store passwords in code

Deploy without device testing

Use deprecated APIs

Accumulate memory leaks

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