Agent skill

mobile-android-design

Master Material Design 3 and Jetpack Compose patterns for building native Android apps. Use when designing Android interfaces, implementing Compose UI, or following Google's Material Design guidelines.

View SKILL.md on GitHub Repository
Stars 32,911
Forks 3,584

Install this agent skill to your Project

npx add-skill https://github.com/wshobson/agents/tree/main/plugins/ui-design/skills/mobile-android-design

SKILL.md

Android Mobile Design

Master Material Design 3 (Material You) and Jetpack Compose to build modern, adaptive Android applications that integrate seamlessly with the Android ecosystem.

When to Use This Skill

  • Designing Android app interfaces following Material Design 3
  • Building Jetpack Compose UI and layouts
  • Implementing Android navigation patterns (Navigation Compose)
  • Creating adaptive layouts for phones, tablets, and foldables
  • Using Material 3 theming with dynamic colors
  • Building accessible Android interfaces
  • Implementing Android-specific gestures and interactions
  • Designing for different screen configurations

Core Concepts

1. Material Design 3 Principles

Personalization: Dynamic color adapts UI to user's wallpaper Accessibility: Tonal palettes ensure sufficient color contrast Large Screens: Responsive layouts for tablets and foldables

Material Components:

  • Cards, Buttons, FABs, Chips
  • Navigation (rail, drawer, bottom nav)
  • Text fields, Dialogs, Sheets
  • Lists, Menus, Progress indicators

2. Jetpack Compose Layout System

Column and Row:

kotlin
// Vertical arrangement with alignment
Column(
    modifier = Modifier.padding(16.dp),
    verticalArrangement = Arrangement.spacedBy(12.dp),
    horizontalAlignment = Alignment.Start
) {
    Text(
        text = "Title",
        style = MaterialTheme.typography.headlineSmall
    )
    Text(
        text = "Subtitle",
        style = MaterialTheme.typography.bodyMedium,
        color = MaterialTheme.colorScheme.onSurfaceVariant
    )
}

// Horizontal arrangement with weight
Row(
    modifier = Modifier.fillMaxWidth(),
    horizontalArrangement = Arrangement.SpaceBetween,
    verticalAlignment = Alignment.CenterVertically
) {
    Icon(Icons.Default.Star, contentDescription = null)
    Text("Featured")
    Spacer(modifier = Modifier.weight(1f))
    TextButton(onClick = {}) {
        Text("View All")
    }
}

Lazy Lists and Grids:

kotlin
// Lazy column with sticky headers
LazyColumn {
    items.groupBy { it.category }.forEach { (category, categoryItems) ->
        stickyHeader {
            Text(
                text = category,
                modifier = Modifier
                    .fillMaxWidth()
                    .background(MaterialTheme.colorScheme.surface)
                    .padding(16.dp),
                style = MaterialTheme.typography.titleMedium
            )
        }
        items(categoryItems) { item ->
            ItemRow(item = item)
        }
    }
}

// Adaptive grid
LazyVerticalGrid(
    columns = GridCells.Adaptive(minSize = 150.dp),
    contentPadding = PaddingValues(16.dp),
    horizontalArrangement = Arrangement.spacedBy(12.dp),
    verticalArrangement = Arrangement.spacedBy(12.dp)
) {
    items(items) { item ->
        ItemCard(item = item)
    }
}

3. Navigation Patterns

Bottom Navigation:

kotlin
@Composable
fun MainScreen() {
    val navController = rememberNavController()

    Scaffold(
        bottomBar = {
            NavigationBar {
                val navBackStackEntry by navController.currentBackStackEntryAsState()
                val currentDestination = navBackStackEntry?.destination

                NavigationDestination.entries.forEach { destination ->
                    NavigationBarItem(
                        icon = { Icon(destination.icon, contentDescription = null) },
                        label = { Text(destination.label) },
                        selected = currentDestination?.hierarchy?.any {
                            it.route == destination.route
                        } == true,
                        onClick = {
                            navController.navigate(destination.route) {
                                popUpTo(navController.graph.findStartDestination().id) {
                                    saveState = true
                                }
                                launchSingleTop = true
                                restoreState = true
                            }
                        }
                    )
                }
            }
        }
    ) { innerPadding ->
        NavHost(
            navController = navController,
            startDestination = NavigationDestination.Home.route,
            modifier = Modifier.padding(innerPadding)
        ) {
            composable(NavigationDestination.Home.route) { HomeScreen() }
            composable(NavigationDestination.Search.route) { SearchScreen() }
            composable(NavigationDestination.Profile.route) { ProfileScreen() }
        }
    }
}

Navigation Drawer:

kotlin
@Composable
fun DrawerNavigation() {
    val drawerState = rememberDrawerState(DrawerValue.Closed)
    val scope = rememberCoroutineScope()

    ModalNavigationDrawer(
        drawerState = drawerState,
        drawerContent = {
            ModalDrawerSheet {
                Spacer(Modifier.height(12.dp))
                Text(
                    "App Name",
                    modifier = Modifier.padding(16.dp),
                    style = MaterialTheme.typography.titleLarge
                )
                HorizontalDivider()

                NavigationDrawerItem(
                    icon = { Icon(Icons.Default.Home, null) },
                    label = { Text("Home") },
                    selected = true,
                    onClick = { scope.launch { drawerState.close() } }
                )
                NavigationDrawerItem(
                    icon = { Icon(Icons.Default.Settings, null) },
                    label = { Text("Settings") },
                    selected = false,
                    onClick = { }
                )
            }
        }
    ) {
        Scaffold(
            topBar = {
                TopAppBar(
                    title = { Text("Home") },
                    navigationIcon = {
                        IconButton(onClick = { scope.launch { drawerState.open() } }) {
                            Icon(Icons.Default.Menu, contentDescription = "Menu")
                        }
                    }
                )
            }
        ) { innerPadding ->
            Content(modifier = Modifier.padding(innerPadding))
        }
    }
}

4. Material 3 Theming

Color Scheme:

kotlin
// Dynamic color (Android 12+)
val dynamicColorScheme = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
    val context = LocalContext.current
    if (darkTheme) dynamicDarkColorScheme(context)
    else dynamicLightColorScheme(context)
} else {
    if (darkTheme) DarkColorScheme else LightColorScheme
}

// Custom color scheme
private val LightColorScheme = lightColorScheme(
    primary = Color(0xFF6750A4),
    onPrimary = Color.White,
    primaryContainer = Color(0xFFEADDFF),
    onPrimaryContainer = Color(0xFF21005D),
    secondary = Color(0xFF625B71),
    onSecondary = Color.White,
    tertiary = Color(0xFF7D5260),
    onTertiary = Color.White,
    surface = Color(0xFFFFFBFE),
    onSurface = Color(0xFF1C1B1F),
)

Typography:

kotlin
val AppTypography = Typography(
    displayLarge = TextStyle(
        fontFamily = FontFamily.Default,
        fontWeight = FontWeight.Normal,
        fontSize = 57.sp,
        lineHeight = 64.sp
    ),
    headlineMedium = TextStyle(
        fontFamily = FontFamily.Default,
        fontWeight = FontWeight.Normal,
        fontSize = 28.sp,
        lineHeight = 36.sp
    ),
    titleLarge = TextStyle(
        fontFamily = FontFamily.Default,
        fontWeight = FontWeight.Normal,
        fontSize = 22.sp,
        lineHeight = 28.sp
    ),
    bodyLarge = TextStyle(
        fontFamily = FontFamily.Default,
        fontWeight = FontWeight.Normal,
        fontSize = 16.sp,
        lineHeight = 24.sp
    ),
    labelMedium = TextStyle(
        fontFamily = FontFamily.Default,
        fontWeight = FontWeight.Medium,
        fontSize = 12.sp,
        lineHeight = 16.sp
    )
)

5. Component Examples

Cards:

kotlin
@Composable
fun FeatureCard(
    title: String,
    description: String,
    imageUrl: String,
    onClick: () -> Unit
) {
    Card(
        onClick = onClick,
        modifier = Modifier.fillMaxWidth(),
        shape = RoundedCornerShape(16.dp),
        colors = CardDefaults.cardColors(
            containerColor = MaterialTheme.colorScheme.surfaceVariant
        )
    ) {
        Column {
            AsyncImage(
                model = imageUrl,
                contentDescription = null,
                modifier = Modifier
                    .fillMaxWidth()
                    .height(180.dp),
                contentScale = ContentScale.Crop
            )
            Column(modifier = Modifier.padding(16.dp)) {
                Text(
                    text = title,
                    style = MaterialTheme.typography.titleMedium
                )
                Spacer(modifier = Modifier.height(8.dp))
                Text(
                    text = description,
                    style = MaterialTheme.typography.bodyMedium,
                    color = MaterialTheme.colorScheme.onSurfaceVariant
                )
            }
        }
    }
}

Buttons:

kotlin
// Filled button (primary action)
Button(onClick = { }) {
    Text("Continue")
}

// Filled tonal button (secondary action)
FilledTonalButton(onClick = { }) {
    Icon(Icons.Default.Add, null)
    Spacer(Modifier.width(8.dp))
    Text("Add Item")
}

// Outlined button
OutlinedButton(onClick = { }) {
    Text("Cancel")
}

// Text button
TextButton(onClick = { }) {
    Text("Learn More")
}

// FAB
FloatingActionButton(
    onClick = { },
    containerColor = MaterialTheme.colorScheme.primaryContainer,
    contentColor = MaterialTheme.colorScheme.onPrimaryContainer
) {
    Icon(Icons.Default.Add, contentDescription = "Add")
}

Quick Start Component

kotlin
@Composable
fun ItemListCard(
    item: Item,
    onItemClick: () -> Unit,
    modifier: Modifier = Modifier
) {
    Card(
        onClick = onItemClick,
        modifier = modifier.fillMaxWidth(),
        shape = RoundedCornerShape(12.dp)
    ) {
        Row(
            modifier = Modifier
                .padding(16.dp)
                .fillMaxWidth(),
            verticalAlignment = Alignment.CenterVertically
        ) {
            Box(
                modifier = Modifier
                    .size(48.dp)
                    .clip(CircleShape)
                    .background(MaterialTheme.colorScheme.primaryContainer),
                contentAlignment = Alignment.Center
            ) {
                Icon(
                    imageVector = Icons.Default.Star,
                    contentDescription = null,
                    tint = MaterialTheme.colorScheme.onPrimaryContainer
                )
            }

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

            Column(modifier = Modifier.weight(1f)) {
                Text(
                    text = item.title,
                    style = MaterialTheme.typography.titleMedium
                )
                Text(
                    text = item.subtitle,
                    style = MaterialTheme.typography.bodyMedium,
                    color = MaterialTheme.colorScheme.onSurfaceVariant
                )
            }

            Icon(
                imageVector = Icons.Default.ChevronRight,
                contentDescription = null,
                tint = MaterialTheme.colorScheme.onSurfaceVariant
            )
        }
    }
}

Best Practices

  1. Use Material Theme: Access colors via MaterialTheme.colorScheme for automatic dark mode support
  2. Support Dynamic Color: Enable dynamic color on Android 12+ for personalization
  3. Adaptive Layouts: Use WindowSizeClass for responsive designs
  4. Content Descriptions: Add contentDescription to all interactive elements
  5. Touch Targets: Minimum 48dp touch targets for accessibility
  6. State Hoisting: Hoist state to make components reusable and testable
  7. Remember Properly: Use remember and rememberSaveable appropriately
  8. Preview Annotations: Add @Preview with different configurations

Common Issues

  • Recomposition Issues: Avoid passing unstable lambdas; use remember
  • State Loss: Use rememberSaveable for configuration changes
  • Performance: Use LazyColumn instead of Column for long lists
  • Theme Leaks: Ensure MaterialTheme wraps all composables
  • Navigation Crashes: Handle back press and deep links properly
  • Memory Leaks: Cancel coroutines in DisposableEffect

Recommended Agent Skills

Expand your agent's capabilities with these related and highly-rated skills.

wshobson/agents

protocol-reverse-engineering

Master network protocol reverse engineering including packet analysis, protocol dissection, and custom protocol documentation. Use when analyzing network traffic, understanding proprietary protocols, or debugging network communication.

32,911 3,584
Explore
wshobson/agents

binary-analysis-patterns

Master binary analysis patterns including disassembly, decompilation, control flow analysis, and code pattern recognition. Use when analyzing executables, understanding compiled code, or performing static analysis on binaries.

32,911 3,584
Explore
wshobson/agents

anti-reversing-techniques

Understand anti-reversing, obfuscation, and protection techniques encountered during software analysis. Use this skill when analyzing malware evasion techniques, when implementing anti-debugging protections for CTF challenges, when reverse engineering packed binaries, or when building security research tools that need to detect virtualized environments.

32,911 3,584
Explore
wshobson/agents

memory-forensics

Master memory forensics techniques including memory acquisition, process analysis, and artifact extraction using Volatility and related tools. Use when analyzing memory dumps, investigating incidents, or performing malware analysis from RAM captures.

32,911 3,584
Explore
wshobson/agents

nx-workspace-patterns

Configure and optimize Nx monorepo workspaces. Use when setting up Nx, configuring project boundaries, optimizing build caching, or implementing affected commands.

32,911 3,584
Explore
wshobson/agents

auth-implementation-patterns

Master authentication and authorization patterns including JWT, OAuth2, session management, and RBAC to build secure, scalable access control systems. Use when implementing auth systems, securing APIs, or debugging security issues.

32,911 3,584
Explore

Didn't find tool you were looking for?

Be as detailed as possible for better results