Android Compose Development Skill

Stack Overview

Kingly Android App: apps/android/

Technology	Version	Purpose
Kotlin	2.x	Primary language
Jetpack Compose	BOM 2024+	Declarative UI
Material 3	Dynamic colors	Design system
compileSdk	36 (Android 16)	Target platform
minSdk	31 (Android 12)	Minimum support

Project Structure

apps/android/
├── app/
│   ├── build.gradle.kts           ← Dependencies, versions
│   └── src/main/java/bot/molt/android/
│       ├── MainActivity.kt        ← Entry point
│       ├── MainViewModel.kt       ← App state
│       ├── NodeRuntime.kt         ← Gateway node
│       ├── chat/                  ← Chat models/controller
│       ├── gateway/               ← GatewaySession, discovery, TLS
│       ├── node/                  ← Camera, location, canvas
│       ├── protocol/              ← A2UI actions, constants
│       ├── ui/                    ← Compose UI components
│       │   ├── KinglyBotTheme.kt  ← Theme (Material 3)
│       │   ├── RootScreen.kt      ← Main screen
│       │   ├── ChatSheet.kt       ← Chat bottom sheet
│       │   ├── SettingsSheet.kt   ← Settings UI
│       │   └── chat/              ← Chat UI components
│       └── voice/                 ← Voice/wake word
└── gradle/                        ← Gradle wrapper

Build Commands

# Build debug APK
cd apps/android && ./gradlew assembleDebug

# Run tests
./gradlew test

# Lint check
./gradlew lint

# Install on connected device
./gradlew installDebug

# Clean build
./gradlew clean assembleDebug

Theme System (Aligned with iOS/macOS)

The theme uses Material 3 dynamic colors. To align with OCDesignKit:

// Current: apps/android/app/src/main/java/bot/molt/android/ui/KinglyBotTheme.kt
@Composable
fun KinglyBotTheme(content: @Composable () -> Unit) {
    val isDark = isSystemInDarkTheme()

    // Custom color scheme to match OCColors
    val colorScheme = if (isDark) {
        darkColorScheme(
            background = Color(0xFF0D0D14),      // OCColors.background dark
            surface = Color(0xFF14121E),          // OCColors.surface dark
            primary = Color(0xFF6366F1),          // Indigo accent
            onBackground = Color.White,
            onSurface = Color.White.copy(alpha = 0.7f)
        )
    } else {
        lightColorScheme(
            background = Color(0xFFFAFAF8),       // OCColors.background light (cream)
            surface = Color(0xFFFFFFFF),          // OCColors.surface light
            primary = Color(0xFF6366F1),          // Indigo accent
            onBackground = Color(0xFF1A1A1A),
            onSurface = Color(0xFF6B6B6B)
        )
    }

    MaterialTheme(colorScheme = colorScheme, content = content)
}

SwiftUI → Compose Mapping

SwiftUI (iOS)	Compose (Android)
VStack	Column
HStack	Row
ZStack	Box
List	LazyColumn
NavigationStack	NavHost
@State	remember { mutableStateOf() }
@Observable	ViewModel + StateFlow
.sheet()	ModalBottomSheet
.background()	Modifier.background()
.padding()	Modifier.padding()
RoundedRectangle	RoundedCornerShape
Color.indigo	Color(0xFF6366F1)

Component Patterns

Card (matching OCCard)

@Composable
fun KinglyCard(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit
) {
    Card(
        modifier = modifier,
        shape = RoundedCornerShape(16.dp),
        colors = CardDefaults.cardColors(
            containerColor = MaterialTheme.colorScheme.surface
        ),
        border = BorderStroke(1.dp, MaterialTheme.colorScheme.outlineVariant)
    ) {
        Column(
            modifier = Modifier.padding(16.dp),
            content = content
        )
    }
}

List Item (matching OCToggleRow)

@Composable
fun KinglyToggleRow(
    icon: ImageVector,
    iconTint: Color,
    title: String,
    subtitle: String?,
    checked: Boolean,
    onCheckedChange: (Boolean) -> Unit
) {
    Row(
        modifier = Modifier
            .fillMaxWidth()
            .padding(16.dp),
        verticalAlignment = Alignment.CenterVertically
    ) {
        Box(
            modifier = Modifier
                .size(44.dp)
                .background(
                    color = if (checked) iconTint.copy(alpha = 0.15f)
                           else MaterialTheme.colorScheme.surfaceVariant,
                    shape = RoundedCornerShape(12.dp)
                ),
            contentAlignment = Alignment.Center
        ) {
            Icon(
                imageVector = icon,
                contentDescription = null,
                tint = if (checked) iconTint else Color.Gray
            )
        }

        Spacer(modifier = Modifier.width(16.dp))

        Column(modifier = Modifier.weight(1f)) {
            Text(text = title, style = MaterialTheme.typography.titleMedium)
            subtitle?.let {
                Text(text = it, style = MaterialTheme.typography.bodySmall)
            }
        }

        Switch(checked = checked, onCheckedChange = onCheckedChange)
    }
}

Spacing Tokens (matching OCSpacing)

object KinglySpacing {
    val xs = 4.dp
    val sm = 8.dp
    val md = 12.dp
    val lg = 16.dp
    val xl = 20.dp
    val xxl = 24.dp
}

object KinglyRadius {
    val sm = 8.dp
    val md = 12.dp
    val lg = 16.dp
    val xl = 20.dp
}

Feature Parity Checklist (vs iOS)

Feature	iOS	Android	Priority
Chat UI	✅	✅	-
Voice chat	✅	✅	-
Gateway connection	✅	✅	-
Sessions list	✅	⚠️ Basic	P1
Sidebar/drawer	✅	❌	P1
Onboarding flow	✅	❌	P1
Settings UI	✅	⚠️ Basic	P2
Marketplace	✅	❌	P3
Design tokens aligned	✅	❌	P0

Testing

# Unit tests
./gradlew test

# Run specific test
./gradlew test --tests "bot.molt.android.gateway.*"

# UI tests (requires emulator)
./gradlew connectedAndroidTest

ADB Commands

# List devices
adb devices

# Install APK
adb install -r app/build/outputs/apk/debug/app-debug.apk

# View logs
adb logcat -s "KinglyBot"

# Clear app data
adb shell pm clear bot.molt.android

# Screenshot
adb exec-out screencap -p > screenshot.png

Common Issues

Compose preview not rendering:

• Clean build: ./gradlew clean
• Invalidate caches in Android Studio

Dynamic colors not working:

• Requires Android 12+ (API 31)
• Fallback to custom colors on older devices

Gateway connection fails:

• Check network security config: res/xml/network_security_config.xml
• Ensure TLS pinning matches iOS

Post-MVP Work

1. P0: Align theme colors with OCDesignKit (cream light mode)
2. P1: Add sidebar navigation (ChatGPT-style drawer)
3. P1: Build onboarding flow matching iOS
4. P2: Port SettingsView sections from iOS
5. P3: Add marketplace UI (TikTok swipe cards → ViewPager2)

Technique Map

• Identify scope — Determine what the skill applies to before executing.
• Follow workflow — Use documented steps; avoid ad-hoc shortcuts.
• Verify outputs — Check results match expected contract.
• Handle errors — Graceful degradation when dependencies missing.
• Reference docs — Load references/ when detail needed.
• Preserve state — Don't overwrite user config or artifacts.

Technique Notes

Skill-specific technique rationale. Apply patterns from the skill body. Progressive disclosure: metadata first, body on trigger, references on demand.

Prompt Architect Overlay

Role Definition: Specialist for android-compose domain. Executes workflows, produces artifacts, routes to related skills when needed.

Input Contract: Context, optional config, artifacts from prior steps. Depends on skill.

Output Contract: Artifacts, status, next-step recommendations. Format per skill.

Edge Cases & Fallbacks: Missing context—ask or infer from workspace. Dependency missing—degrade gracefully; note in output. Ambiguous request—clarify before proceeding.