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How does the Relay connect Android app developm...

How does the Relay connect Android app development and Design?

At Google I/O 2023, there will be one session on Relay, which is an experience of the process of developing a single Android application using Relay. This deck introduces how to connect Android app development and design using Relay.

- Build a complete app with Relay and Compose
- https://io.google/2023/program/bac078a1-4c65-4566-b200-71e8cbe14601/
- Codelab: Build a complete app with Relay and Jetpack Compose
- https://codelabs.developers.google.com/relay-complete-app#0
- Overview: Relay
- https://developer.android.com/jetpack/compose/tooling/relay

Ryosuke Horie

June 01, 2023
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  1. How does the Relay connect Android app development and Design?


    ZOZO, Inc.
 Technology Division Technology Strategy Department CTO Section
 Ryosuke Horie Copyright © ZOZO, Inc. 1 2023/6/1 
 Recap: Google I/O 2023

  2. © ZOZO, Inc. ZOZO, Inc.
 Technology Division 
 Technology Strategy

    Department
 CTO Section
 Ryosuke Horie
 2
  3. © ZOZO, Inc. 5 What is Relay?
 • Easy to

    build apps with Figma's UI components

  4. © ZOZO, Inc. 9 What is UI Packages?
 • Intermediate

    representation of UI shared between Figma and Android Studio
 https://developer.android.com/jetpack/compose/tooling/relay/create-ui-packages
  5. © ZOZO, Inc. 10 What is UI Packages?
 • Intermediate

    representation of UI shared between Figma and Android Studio
 • The UI package contains the following information:
 ◦ Layout Information
 ◦ UI Package Summary
 ◦ Content and interaction parameters
 ◦ Styling information
 ◦ Font and image assets
 https://developer.android.com/jetpack/compose/tooling/relay/create-ui-packages
  6. © ZOZO, Inc. 12 Relay workflow
 Figma Relay for Figma

    Plugin UI Packages Android Studio Relay for Android Studio Plugin Components Android Studio icon from: https://developer.android.com/studio
  7. © ZOZO, Inc. • UI Package is fetched by entering

    the Figma source URL
 13 Import UI Package with Relay for Android Studio Plugin
 
 

  8. © ZOZO, Inc. • UI Package is fetched by entering

    the Figma source URL
 • Fetched UI Packages are placed under ui-packages
 14 Import UI Package with Relay for Android Studio Plugin
 
 

  9. © ZOZO, Inc. 15 Relay workflow
 Figma Relay for Figma

    Plugin UI Packages Android Studio Relay for Android Studio Plugin Components Android Studio icon from: https://developer.android.com/studio
  10. © ZOZO, Inc. 16 Relay workflow
 Figma Relay for Figma

    Plugin UI Packages Android Studio Relay for Android Studio Plugin Components Relay Gradle Plugin Android Studio icon from: https://developer.android.com/studio
  11. © ZOZO, Inc. 17 Generate code from UI package with

    Relay Gradle Plugin
 
 
 
 
 • Generate Composables in Android project build

  12. © ZOZO, Inc. 18 Generate code from UI package with

    Relay Gradle Plugin
 
 
 
 
 • Generate Composables in Android project build
 • The following two gradle tasks are defined:
 ◦ generateRelayCode
 ◦ generateRelayRuntimeCode
 • Perform these tasks if you only want to build UI packages

  13. © ZOZO, Inc. 19 Relay workflow
 Figma Relay for Figma

    Plugin UI Packages Relay Gradle Plugin Relay for Android Studio Plugin Composables Components @Composable fun EventCard(modifier: Modifier = Modifier) { TopLevel(modifier = modifier) { Thumbnail() Title() Description() } } Android Studio Android Studio icon from: https://developer.android.com/studio
  14. © ZOZO, Inc. 20 Relay workflow
 Figma Relay for Figma

    Plugin UI Packages Relay Gradle Plugin Relay for Android Studio Plugin Composables Components @Composable fun EventCard(modifier: Modifier = Modifier) { TopLevel(modifier = modifier) { Thumbnail() Title() Description() } } Android Studio Android Studio icon from: https://developer.android.com/studio
  15. © ZOZO, Inc. 22 Make and propagate design updates
 •

    Update design and save named version

  16. © ZOZO, Inc. 23 Make and propagate design updates
 •

    Update UI package in Android Studio
 • Rebuild Android project to reflect updates

  17. © ZOZO, Inc. 25 What should I do in these

    cases?
 • Dynamically change text and images
 • Handling Components with Multiple UI Patterns
 • Handling clicks and other interactions

  18. © ZOZO, Inc. 31 Handling Design Variants
 • Create Design

    Variants with Figma
 • Relay can handle Variants
 ◦ Switching Composables with enum

  19. © ZOZO, Inc. 32 Handling Design Variants
 • Switching Composable

    with enum
 // Design to select for EventComponents enum class View { EventCard, ListItem } /** * This composable was generated from the UI Package 'event_components'. * Generated code; do not edit directly */ @Composable fun EventComponents( modifier: Modifier = Modifier, view: View = View.EventCard ) { when (view) { View.EventCard -> TopLevelViewEventCard(modifier = modifier) { ThumbnailViewEventCard() TitleViewEventCard() DescriptionViewEventCard() } View.ListItem -> TopLevelViewListItem(modifier = modifier) { ThumbnailViewListItem() TextsViewListItem { TitleViewListItem() DescriptionViewListItem() OptionsViewListItem { OptionViewListItem() } } } }
  20. © ZOZO, Inc. 33 Handling Design Variants
 • Switching Composable

    with enum
 // Design to select for EventComponents enum class View { EventCard, ListItem } /** * This composable was generated from the UI Package 'event_components'. * Generated code; do not edit directly */ @Composable fun EventComponents( modifier: Modifier = Modifier, view: View = View.EventCard ) { when (view) { View.EventCard -> TopLevelViewEventCard(modifier = modifier) { ThumbnailViewEventCard() TitleViewEventCard() DescriptionViewEventCard() } View.ListItem -> TopLevelViewListItem(modifier = modifier) { ThumbnailViewListItem() TextsViewListItem { TitleViewListItem() DescriptionViewListItem() OptionsViewListItem { OptionViewListItem() } } } }
  21. © ZOZO, Inc. 34 Handling Design Variants
 • Switching Composable

    with enum
 // Design to select for EventComponents enum class View { EventCard, ListItem } /** * This composable was generated from the UI Package 'event_components'. * Generated code; do not edit directly */ @Composable fun EventComponents( modifier: Modifier = Modifier, view: View = View.EventCard ) { when (view) { View.EventCard -> TopLevelViewEventCard(modifier = modifier) { ThumbnailViewEventCard() TitleViewEventCard() DescriptionViewEventCard() } View.ListItem -> TopLevelViewListItem(modifier = modifier) { ThumbnailViewListItem() TextsViewListItem { TitleViewListItem() DescriptionViewListItem() OptionsViewListItem { OptionViewListItem() } } } }
  22. © ZOZO, Inc. 35 Handling Design Variants
 • Switching Composable

    with enum
 // Design to select for EventComponents enum class View { EventCard, ListItem } /** * This composable was generated from the UI Package 'event_components'. * Generated code; do not edit directly */ @Composable fun EventComponents( modifier: Modifier = Modifier, view: View = View.EventCard ) { when (view) { View.EventCard -> TopLevelViewEventCard(modifier = modifier) { ThumbnailViewEventCard() TitleViewEventCard() DescriptionViewEventCard() } View.ListItem -> TopLevelViewListItem(modifier = modifier) { ThumbnailViewListItem() TextsViewListItem { TitleViewListItem() DescriptionViewListItem() OptionsViewListItem { OptionViewListItem() } } } }
  23. © ZOZO, Inc. 36 Content Parameters in Design Variants
 •

    Add content parameters to entire Design Variants

  24. © ZOZO, Inc. 37 /** * This composable was generated

    from the UI Package 'event_components'. * Generated code; do not edit directly * * @param thumbnail Event thumbnail image * @param title Event title * @param description Event description */ @Composable fun EventComponents( modifier: Modifier = Modifier, view: View = View.EventCard, thumbnail: Painter = EmptyPainter(), title: String = "", description: String = "" ) { when (view) { View.EventCard -> TopLevelViewEventCard(modifier = modifier) { ThumbnailViewEventCard(thumbnail = thumbnail) TitleViewEventCard(title = title) DescriptionViewEventCard(description = description) } View.ListItem -> TopLevelViewListItem(modifier = modifier) { ThumbnailViewListItem(thumbnail = thumbnail) TextsViewListItem { TitleViewListItem(title = title) DescriptionViewListItem(description = description) OptionsViewListItem { OptionViewListItem() } } } }
  25. © ZOZO, Inc. 38 /** * This composable was generated

    from the UI Package 'event_components'. * Generated code; do not edit directly * * @param thumbnail Event thumbnail image * @param title Event title * @param description Event description */ @Composable fun EventComponents( modifier: Modifier = Modifier, view: View = View.EventCard, thumbnail: Painter = EmptyPainter(), title: String = "", description: String = "" ) { when (view) { View.EventCard -> TopLevelViewEventCard(modifier = modifier) { ThumbnailViewEventCard(thumbnail = thumbnail) TitleViewEventCard(title = title) DescriptionViewEventCard(description = description) } View.ListItem -> TopLevelViewListItem(modifier = modifier) { ThumbnailViewListItem(thumbnail = thumbnail) TextsViewListItem { TitleViewListItem(title = title) DescriptionViewListItem(description = description) OptionsViewListItem { OptionViewListItem() } } } }
  26. © ZOZO, Inc. 41 @Composable fun EventComponents( modifier: Modifier =

    Modifier, view: View = View.EventCard, thumbnail: Painter = EmptyPainter(), title: String = "", description: String = "", onTapped: () -> Unit = {} ) { when (view) { View.EventCard -> TopLevelViewEventCard( onTapped = onTapped, modifier = modifier ) { ThumbnailViewEventCard(thumbnail = thumbnail) TitleViewEventCard(title = title) DescriptionViewEventCard(description = description) } View.ListItem -> TopLevelViewListItem( onTapped = onTapped, modifier = modifier ) { ThumbnailViewListItem(thumbnail = thumbnail) TextsViewListItem { TitleViewListItem(title = title) DescriptionViewListItem(description = description) OptionsViewListItem { OptionViewListItem() } } } } }
  27. © ZOZO, Inc. 42 @Composable fun EventComponents( modifier: Modifier =

    Modifier, view: View = View.EventCard, thumbnail: Painter = EmptyPainter(), title: String = "", description: String = "", onTapped: () -> Unit = {} ) { when (view) { View.EventCard -> TopLevelViewEventCard( onTapped = onTapped, modifier = modifier ) { ThumbnailViewEventCard(thumbnail = thumbnail) TitleViewEventCard(title = title) DescriptionViewEventCard(description = description) } View.ListItem -> TopLevelViewListItem( onTapped = onTapped, modifier = modifier ) { ThumbnailViewListItem(thumbnail = thumbnail) TextsViewListItem { TitleViewListItem(title = title) DescriptionViewListItem(description = description) OptionsViewListItem { OptionViewListItem() } } } } }
  28. © ZOZO, Inc. 43 Partially add Interaction Handlers
 • Add

    interactions only for specific components

  29. © ZOZO, Inc. 44 @Composable fun EventComponents( modifier: Modifier =

    Modifier, view: View = View.EventCard, thumbnail: Painter = EmptyPainter(), title: String = "", description: String = "", onTapped: () -> Unit = {}, onMenuTapped: () -> Unit = {} ) { when (view) { View.EventCard -> TopLevelViewEventCard( onTapped = onTapped, modifier = modifier ) { ThumbnailViewEventCard(thumbnail = thumbnail) TitleViewEventCard(title = title) DescriptionViewEventCard(description = description) } View.ListItem -> TopLevelViewListItem( onTapped = onTapped, modifier = modifier ) { ThumbnailViewListItem(thumbnail = thumbnail) TextsViewListItem { TitleViewListItem(title = title) DescriptionViewListItem(description = description) OptionsViewListItem { OptionViewListItem(onMenuTapped = onMenuTapped) } } } } }
  30. © ZOZO, Inc. 45 @Composable fun EventComponents( modifier: Modifier =

    Modifier, view: View = View.EventCard, thumbnail: Painter = EmptyPainter(), title: String = "", description: String = "", onTapped: () -> Unit = {}, onMenuTapped: () -> Unit = {} ) { when (view) { View.EventCard -> TopLevelViewEventCard( onTapped = onTapped, modifier = modifier ) { ThumbnailViewEventCard(thumbnail = thumbnail) TitleViewEventCard(title = title) DescriptionViewEventCard(description = description) } View.ListItem -> TopLevelViewListItem( onTapped = onTapped, modifier = modifier ) { ThumbnailViewListItem(thumbnail = thumbnail) TextsViewListItem { TitleViewListItem(title = title) DescriptionViewListItem(description = description) OptionsViewListItem { OptionViewListItem(onMenuTapped = onMenuTapped) } } } } }
  31. © ZOZO, Inc. 46 Add state and interaction
 • UI

    package is stateless
 • Wrap your generated package in a custom Composable function for state management
 • For example, if the DropdownMenu is displayed by clicking on the menu

  32. © ZOZO, Inc. 47 @Composable fun EventListItemController( event: Event, onTapped:

    () -> Unit, ) { var expanded by remember { mutableStateOf(false) } Box { EventComponents( … view = View.ListItem, onTapped = onTapped, onMenuTapped = { expanded = true } ) DropdownMenu( expanded = expanded, onDismissRequest = { expanded = false }, ) { DropdownMenuItem( text = { Text(text = "menu1") }, onClick = { /*TODO*/ } ) … } } }
  33. © ZOZO, Inc. 48 @Composable fun EventListItemController( event: Event, onTapped:

    () -> Unit, ) { var expanded by remember { mutableStateOf(false) } Box { EventComponents( … view = View.ListItem, onTapped = onTapped, onMenuTapped = { expanded = true } ) DropdownMenu( expanded = expanded, onDismissRequest = { expanded = false }, ) { DropdownMenuItem( text = { Text(text = "menu1") }, onClick = { /*TODO*/ } ) … } } }
  34. © ZOZO, Inc. 49 What should I do in these

    cases?
 • Dynamically change text and images
 • Handling Components with Multiple UI Patterns
 • Handling clicks and other interactions

  35. © ZOZO, Inc. 50 What should I do in these

    cases?
 • Dynamically change text and images
 → Content Parameters
 • Handling Components with Multiple UI Patterns
 → Switching in Design Variants
 • Handling clicks and other interactions
 → Interaction Handlers

  36. © ZOZO, Inc. 52 Other Features
 • Mapping Figma’s Styles

    to Compose theme
 • Mapping components to existing code

  37. © ZOZO, Inc. 53 Pros & Cons
 • Composables generated

    from design files are considered accurate
 • Easy Android app development with UI package
 • Need to design with the generated code in mind, for better or worse
 • Roles of designers and engineers need to be reconsidered
 

  38. © ZOZO, Inc. 54 Conclusion
 • Design and Android app

    development are closely connected
 • It is exciting to see Composable being generated from Figma!
 ◦ This is an α release and I look forward to future updates
 • A lot of thinking to ask into the development process, but much potential for productivity improvement.
 

  39. © ZOZO, Inc. 55 How to study Relay?
 • Watch

    “Build a complete app with Relay and Compose”
 • Do Codelab
 • Read the Android Developers documentation
 • Hands on (good if you can do it with a designer)