Android development has a reputation for complexity

A sprawling ecosystem of APIs, competing architecture patterns, and a legacy of XML-based UI code that makes even experienced developers cr. The Android App Builder skill cuts through all of that. Drop it into Claude and you get an opinionated senior engineer who already knows what "good" looks like in 2026.

---

Skill · android-app-builder

Expert Android application builder using modern Kotlin, Jetpack Compose, Material 3, and Google's 2026 architecture standards.

kotlin, jetpack-compose, material3, clean-architecture, hilt, coroutines,

           Why skills change everything.

Without a skill, Claude approaches your Android question like a generalist: it knows a lot, but it'll hedge, offer multiple patterns, and sometimes reach for the familiar (read: outdated) XML layout when the prompt is ambiguous. With a skill, there's no ambiguity. The persona is locked in — Senior Android Engineer, 12+ years, millions of users in production. The defaults are set.

The skill doesn't limit what Claude can do. It eliminates the negotiation about how to do it.

            — On opinionated tooling

This matters most on a platform like Android where there are genuinely multiple ways to accomplish the same thing, and many of them are wrong for greenfield work in 2026. The skill removes that decision overhead entirely.

             The core stack, codified

Every layer of the stack is specified, not suggested. Here's what you get by default:

Jetpack Compose

• Material 3 & Material You dynamic color

Clean Architecture MVVM or MVI, no monoliths

Hilt Dependency injection, zero boilerplate

Coroutines + Flow StateFlow for reactive UI state

Navigation Compose Type-safe routes, no stringly-typed nonsense

Room + DataStore Structured persistence, both structured and key-value

JUnit 5 + Turbine

• MockK + Compose UI tests

Notice what's absent: no Rx, no ViewBinding, no LiveData-everywhere, no ViewModel factory boilerplate. The skill reflects how top Android teams build in practice today.

         What this looks like in practice

With the skill active, a prompt like "add a settings screen with a dark mode toggle" produces something like this — no guidance needed:

// SettingsViewModel.kt

@HiltViewModel class SettingsViewModel @Inject constructor( private val userPrefsRepo: UserPreferencesRepository ) : ViewModel() {

val uiState: StateFlow<SettingsUiState> =
    userPrefsRepo.darkModeEnabled
        .map { SettingsUiState(darkModeEnabled = it) }
        .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5_000), SettingsUiState())

fun onDarkModeToggled(enabled: Boolean) {
    viewModelScope.launch {
        userPrefsRepo.setDarkMode(enabled)
    }
}

}

// SettingsScreen.kt

@Composable fun SettingsScreen( viewModel: SettingsViewModel = hiltViewModel() ) { val uiState by viewModel.uiState.collectAsStateWithLifecycle()

SettingsContent(
    uiState = uiState,
    onDarkModeToggled = viewModel::onDarkModeToggled
)

}

@Composable

private fun SettingsContent( uiState: SettingsUiState, onDarkModeToggled: (Boolean) -> Unit ) { Scaffold { padding -> Column(modifier = Modifier.padding(padding)) { ListItem( headlineContent = { Text("Dark mode") }, trailingContent = { Switch( checked = uiState.darkModeEnabled, onCheckedChange = onDarkModeToggled ) } ) } } }

@Preview(uiMode = UI_MODE_NIGHT_YES) @Preview(uiMode = UI_MODE_NIGHT_NO) @Composable

private fun SettingsContentPreview() { AppTheme { SettingsContent(SettingsUiState(darkModeEnabled = true), {}) } } State is hoisted properly. The ViewModel is injected via Hilt. Flow is collected lifecycle-safely. Both light and dark @Previews are included automatically. That's not a cherry-picked example — that's the baseline.

             The hard rules

The skill enforces a short list of non-negotiables that keep generated code production-quality:

✓ Sealed classes for UI state/events — no stringly-typed state, no nullable spaghetti ✓ Proper state hoisting — stateless Composables, stateful ViewModels ✓ Minimized recompositions — keys, derivedStateOf, stable types used correctly ✓ Dark mode + large screens + foldables + predictive back — adaptive from day one ✓ Extensive @Preview annotations — every screen, multiple configurations ✗ No XML layouts — not even for special cases unless you explicitly ask ✗ No deprecated APIs — no LiveData-only flows, no old Navigation, no pre-Compose patterns ✗ No monolithic patterns — everything is layered, testable, and separated by concern Trigger phrases and how the skill activates The skill activates on explicit triggers like "build an Android app", "Jetpack Compose", or "add screen", as well as keywords like kotlin, android, and material3. In practice, any Android-shaped prompt will pull it in.

If you're mid-conversation and want to switch into Android mode, just use one of the trigger phrases and the skill persona takes over for the rest of the session.

                    Who this is for

Indie developers who don't want to spend three hours reading architecture docs before writing their first screen. Teams who want Claude to generate code that looks like it was written by their most senior engineer. Developers coming from iOS or web who want to produce idiomatic Android without the learning curve.

If you've ever gotten XML from Claude when you wanted Compose, or gotten a ViewModel without Hilt injection when your project uses it everywhere — this skill exists to fix that.

Start building with the skill Drop the android-app-builder skill into your Claude setup and ask it to build your first screen.

SKILL.md file starts below

Add to Claude →

---

name: android-app-builder description: Expert Android application builder using modern Kotlin, Jetpack Compose, Material 3, and Google's 2026 architecture standards. Activates for any Android development request. version: 1.5 triggers:

• "build an Android app"
• "Jetpack Compose"
• "Kotlin Android"
• "add screen"
• "Android feature" keywords:
• android
• kotlin
• jetpack-compose
• material3

---

Android App Builder Skill

You are a Senior Android Engineer with 12+ years experience shipping apps used by millions. You default to 100% Kotlin + Jetpack Compose + Material 3 + Clean Architecture.

Core Stack:

• UI: Jetpack Compose + Material 3 (dynamic color, Material You)
• Architecture: Clean Architecture + MVVM/MVI
• DI: Hilt
• Async: Coroutines + Flow/StateFlow
• Navigation: Jetpack Navigation Compose (type-safe)
• Persistence: Room + DataStore
• Testing: JUnit 5 + Turbine + Mock + Compose UI tests

Always:

• Use sealed classes for UI state/events
• Hoist state properly
• Minimize recompositions
• Support dark mode, large screens, foldables, predictive back
• Add extensive @Preview annotations

Never use XML layouts, deprecated APIs, or monolithic patterns unless explicitly requested.