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Expert guidance for building modern Android UIs with Jetpack Compose, covering state management, navigation, performance, and Material Design 3.
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LanguagePython
LicenseMIT
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</> SKILL.md
android-jetpack-compose-expert.SKILL.md
---name: android-jetpack-compose-expert
description: "Expert guidance for building modern Android UIs with Jetpack Compose, covering state management, navigation, performance, and Material Design 3."
risk: safe
source: community
date_added: "2026-02-27"
---# Android Jetpack Compose Expert
## Overview
A comprehensive guide for building production-quality Android applications using Jetpack Compose. This skill covers architectural patterns, state management with ViewModels, navigation type-safety, and performance optimization techniques.
## When to Use This Skill
- Use when starting a new Android project with Jetpack Compose.
- Use when migrating legacy XML layouts to Compose.
- Use when implementing complex UI state management and side effects.
- Use when optimizing Compose performance (recomposition counts, stability).
- Use when setting up Navigation with type safety.
## Step-by-Step Guide
### 1. Project Setup & Dependencies
Ensure your `libs.versions.toml` includes the necessary Compose BOM and libraries.
```kotlin
[versions]
composeBom = "2024.02.01"
activityCompose = "1.8.2"
Using the new Navigation Compose Type Safety (available in recent versions).
```kotlin
// Define Destinations
@Serializable
object Home
@Serializable
data class Profile(val userId: String)
// Setup NavHost
@Composable
fun AppNavHost(navController: NavHostController) {
NavHost(navController, startDestination = Home) {
composable<Home> {
HomeScreen(onNavigateToProfile = { id ->
navController.navigate(Profile(userId = id))
})
}
composable<Profile> { backStackEntry ->
val profile: Profile = backStackEntry.toRoute()
ProfileScreen(userId = profile.userId)
}
}
}
```
## Best Practices
- ✅ **Do:** Use `remember` and `derivedStateOf` to minimize unnecessary calculations during recomposition.
- ✅ **Do:** Mark data classes used in UI state as `@Immutable` or `@Stable` if they contain `List` or other unstable types to enable smart recomposition skipping.
- ✅ **Do:** Use `LaunchedEffect` for one-off side effects (like showing a Snackbar) triggered by state changes.
- ❌ **Don't:** Perform expensive operations (like sorting a list) directly inside the Composable function body without `remember`.
- ❌ **Don't:** Pass `ViewModel` instances down to child components. Pass only the data (state) and lambda callbacks (events).
## Troubleshooting
**Problem:** Infinite Recomposition loop.
**Solution:** Check if you are creating new object instances (like `List` or `Modifier`) inside the composition without `remember`, or if you are updating state inside the composition phase instead of a side-effect or callback. Use Layout Inspector to debug recomposition counts.
## Limitations
- Use this skill only when the task clearly matches the scope described above.
- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.
