Jetpack Compose is a modern toolkit for building native Android UI. It simplifies UI development with a declarative approach, allowing developers to create consistent and attractive interfaces efficiently. This style guide provides best practices to ensure UI consistency across your applications using Jetpack Compose.

Color Palette

Establishing a cohesive color palette is fundamental for a unified look and feel. Use Material Design color schemes or customize your own palette to match your brand identity. Define primary, secondary, background, surface, and error colors.

  • Primary Colors: Use for main actions and highlights.
  • Secondary Colors: Use for accents and less prominent actions.
  • Background Colors: Use for app backgrounds and surfaces.
  • Error Colors: Use for error states and messages.

Define your color palette in a centralized object or theme to ensure consistency.

Typography

Consistent typography enhances readability and aesthetic appeal. Choose a primary font family and establish text styles for headings, body text, captions, and labels. Use Jetpack Compose's Typography system to define these styles.

  • Headings: Use for section titles and important labels.
  • Body Text: Use for main content.
  • Captions and Labels: Use for supplementary information.

Maintain consistent font sizes, weights, and line heights across your app.

Component Styling

Standardize the appearance of UI components such as buttons, cards, and input fields. Use Material Design components where possible, customizing their styles to match your theme.

  • Buttons: Define styles for primary, secondary, and disabled states.
  • Cards: Set consistent padding, elevation, and corner radius.
  • Input Fields: Standardize borders, hint text styles, and error states.

Create reusable composables for these components to ensure style consistency throughout your app.

Spacing and Layout

Consistent spacing and layout improve the visual hierarchy and user experience. Define standard margins, paddings, and grid systems.

  • Margins and Paddings: Use a consistent scale, such as 4dp, 8dp, 16dp, 24dp.
  • Grid System: Use for aligning components and creating balanced layouts.
  • Alignment: Maintain alignment consistency for text and components.

Implement layout composables that incorporate these spacing standards for uniformity.

State and Interaction Styles

Visual cues for different states (hover, pressed, disabled, focused) are crucial for usability. Define styles for each state to provide clear feedback to users.

  • Button States: Change background color, elevation, or opacity.
  • Input Focus: Highlight borders or change shadow to indicate focus.
  • Disabled States: Reduce opacity or change color to indicate inactivity.

Use modifiers and state variables within your composables to manage these interaction styles effectively.

Dark Mode Support

Ensure your app's theme adapts seamlessly to dark mode. Define color schemes for both light and dark themes and switch between them based on user preferences.

Test your UI in different modes to maintain readability and aesthetic consistency.

Theme Management

Centralize your style definitions using themes. Use MaterialTheme to encapsulate colors, typography, and shapes. This approach simplifies updates and ensures consistency.

Apply themes at the top level of your composable hierarchy for a unified style across your app.

Best Practices Summary

  • Define a comprehensive color palette and typography styles.
  • Create reusable styled components for common UI elements.
  • Maintain consistent spacing and layout standards.
  • Implement visual feedback for different interaction states.
  • Support dark mode with adaptable themes.
  • Manage styles centrally using themes for easy updates.

Adhering to these guidelines will help you build visually cohesive, accessible, and user-friendly Android applications with Jetpack Compose.