Android Design System (Jetpack Compose)

Priority: P2 (OPTIONAL)

Enforce Material Design 3 tokens in Jetpack Compose. Use MaterialTheme for consistency.

Token Structure

// ui/theme/Color.kt
val Primary = Color(0xFF2196F3)
val Secondary = Color(0xFF9C27B0)
val Background = Color(0xFFFFFFFF)

// ui/theme/Theme.kt
private val LightColorScheme = lightColorScheme(
    primary = Primary,
    secondary = Secondary,
    background = Background
)

// ui/theme/Type.kt
val Typography = Typography(
    headlineLarge = TextStyle(fontSize = 32.sp, fontWeight = FontWeight.Bold),
    bodyMedium = TextStyle(fontSize = 16.sp, fontWeight = FontWeight.Normal)
)

Usage

// ❌ FORBIDDEN
Box(modifier = Modifier.background(Color(0xFF2196F3)))
Text("Title", fontSize = 32.sp, color = Color.Black)

// ✅ ENFORCED
Box(modifier = Modifier.background(MaterialTheme.colorScheme.primary))
Text("Title", style = MaterialTheme.typography.headlineLarge)
Spacer(modifier = Modifier.height(16.dp)) // Use dp units

Anti-Patterns

• No Hardcoded Colors: Use Color(0xFF...) → Error. Use MaterialTheme.colorScheme.*.
• No Inline Typography: Define fontSize = 32.sp → Error. Use MaterialTheme.typography.*.
• No Magic Spacing: Use padding = 16.dp inline → Acceptable, but consider tokens.

Related Topics

mobile-ux-core | android/compose