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.
What this skill does
# 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
## Detailed section: Core Concepts
Originally a 9201-byte section in this SKILL.md. Moved to `references/details.md` to fit Codex's 8 KB skill body cap.
## 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`
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