60. Introduction to Jetpack Compose - Basic theming

🚀 Introduction to Jetpack Compose: Mastering Basic Theming

Welcome, Android developers! Today we'll dive deep into the world of Jetpack Compose theming - a powerful mechanism for creating consistent and beautiful user interfaces in modern Android applications.

🌈 Understanding Compose Theming Fundamentals

Jetpack Compose introduces a revolutionary approach to UI styling and theming, moving away from traditional XML-based resources to a more dynamic and programmatic method.

📐 Basic Theme Structure

@Composable
fun MyAppTheme(
    darkTheme: Boolean = isSystemInDarkTheme(),
    content: @Composable () -> Unit
) {
    val colors = if (darkTheme) DarkColorPalette else LightColorPalette
    
    MaterialTheme(
        colors = colors,
        typography = Typography,
        shapes = Shapes,
        content = content
    )
}

🎨 Color Customization

Define your custom color palette using Compose's color system:

val LightColorPalette = lightColors(
    primary = Color(0xFF6200EE),
    secondary = Color(0xFF03DAC6),
    background = Color.White
)

val DarkColorPalette = darkColors(
    primary = Color(0xFFBB86FC),
    secondary = Color(0xFF03DAC6),
    background = Color.Black
)

🔤 Typography Theming

Create consistent typography across your app:

val Typography = Typography(
    h1 = TextStyle(
        fontWeight = FontWeight.Bold,
        fontSize = 24.sp
    ),
    body1 = TextStyle(
        fontWeight = FontWeight.Normal,
        fontSize = 16.sp
    )
)

🏗️ Practical Exercises

  • Create a custom color palette for your app
  • Implement dark and light theme switching
  • Define typography styles for different text elements
  • Create a consistent shape system for buttons and cards
  • Implement theme-aware components
Pro Tip: Always use theme-provided colors and typography to ensure consistency and easy global updates.

🔑 Key Takeaways

  • Jetpack Compose themes are programmatically defined
  • Use MaterialTheme for consistent design
  • Create separate color and typography definitions
  • Support both light and dark themes
#JetpackCompose #AndroidDev #Kotlin #MobileDesign

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