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INTRODUCING JETPACK COMPOSE INTO YOUR EXISTING APP Alexander Gherschon 
 Android Tech Lead @ ONE ZERO Digital Bank

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TIMELINE

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TIMELINE Theme

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TIMELINE Components Theme

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TIMELINE Interop Components Theme

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TIMELINE Full Screens Interop Components Theme

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TIMELINE Navigation Full Screens Interop Components Theme

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TIMELINE Navigation Full Screens Interop Components Theme

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TIMELINE Navigation Full Screens Interop Components Theme

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TIMELINE Navigation Full Screens Interop Components Theme

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DEFINING OUR THEME

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

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

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

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

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

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

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THEME - USAGE class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } }

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THEME - USAGE class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } }

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THEME - USAGE class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } }

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THEME - USAGE class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } }

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THEME - USAGE class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } }

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THEME - USAGE class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } } @Composable fun GreetingScreen() { Surface( modi fi er = Modi fi er. fi llMaxSize(), color = MaterialTheme.colors.primary ) { Text(text = "Hello KotlinTLV!") } }

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THEME - USAGE class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } } @Composable fun GreetingScreen() { Surface( modi fi er = Modi fi er. fi llMaxSize(), color = MaterialTheme.colors.primary ) { Text(text = "Hello KotlinTLV!") } }

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THEME - USAGE class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } } @Composable fun GreetingScreen() { Surface( modi fi er = Modi fi er. fi llMaxSize(), color = MaterialTheme.colors.primary ) { Text(text = "Hello KotlinTLV!") } }

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THEME - USAGE class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } } @Composable fun GreetingScreen() { Surface( modi fi er = Modi fi er. fi llMaxSize(), color = MaterialTheme.colors.primary ) { Text(text = "Hello KotlinTLV!") } }

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THEME - USAGE class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } } @Composable fun GreetingScreen() { Surface( modi fi er = Modi fi er. fi llMaxSize(), color = MaterialTheme.colors.primary ) { Text(text = "Hello KotlinTLV!") } }

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THEME - HOW DOES THIS WORK? class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { IntroducingComposeTheme { GreetingScreen() } } } } @Composable fun GreetingScreen() { Surface( modi fi er = Modi fi er. fi llMaxSize(), color = MaterialTheme.colors.primary ) { Text(text = "Hello KotlinTLV!") } }

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A LOOK AT MATERIAL THEME

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

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THEME - MATERIAL THEME @Composable fun MaterialTheme( colors: Colors = MaterialTheme.colors, typography: Typography = MaterialTheme.typography, shapes: Shapes = MaterialTheme.shapes, content: @Composable () -> Unit ) { CompositionLocalProvider( LocalColors provides colors, // more provided compositionLocals content = content ) }

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THEME - MATERIAL THEME @Composable fun MaterialTheme( colors: Colors = MaterialTheme.colors, typography: Typography = MaterialTheme.typography, shapes: Shapes = MaterialTheme.shapes, content: @Composable () -> Unit ) { CompositionLocalProvider( LocalColors provides colors, // more provided compositionLocals content = content ) } object MaterialTheme { val colors: Colors @Composable @ReadOnlyComposable get() = LocalColors.current val typography: Typography // same val shapes: Shapes // same }

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THEME - MATERIAL THEME @Composable fun MaterialTheme( colors: Colors = MaterialTheme.colors, typography: Typography = MaterialTheme.typography, shapes: Shapes = MaterialTheme.shapes, content: @Composable () -> Unit ) { CompositionLocalProvider( LocalColors provides colors, // more provided compositionLocals content = content ) } object MaterialTheme { val colors: Colors @Composable @ReadOnlyComposable get() = LocalColors.current val typography: Typography // same val shapes: Shapes // same }

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THEME - MATERIAL THEME @Composable fun MaterialTheme( colors: Colors = MaterialTheme.colors, typography: Typography = MaterialTheme.typography, shapes: Shapes = MaterialTheme.shapes, content: @Composable () -> Unit ) { CompositionLocalProvider( LocalColors provides colors, // more provided compositionLocals content = content ) } object MaterialTheme { val colors: Colors @Composable @ReadOnlyComposable get() = LocalColors.current val typography: Typography // same val shapes: Shapes // same }

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THEME - MATERIAL THEME @Composable fun MaterialTheme( colors: Colors = MaterialTheme.colors, typography: Typography = MaterialTheme.typography, shapes: Shapes = MaterialTheme.shapes, content: @Composable () -> Unit ) { CompositionLocalProvider( LocalColors provides colors, // more provided compositionLocals content = content ) } object MaterialTheme { val colors: Colors @Composable @ReadOnlyComposable get() = LocalColors.current val typography: Typography // same val shapes: Shapes // same }

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THEME - MATERIAL THEME @Composable fun MaterialTheme( colors: Colors = MaterialTheme.colors, typography: Typography = MaterialTheme.typography, shapes: Shapes = MaterialTheme.shapes, content: @Composable () -> Unit ) { CompositionLocalProvider( LocalColors provides colors, // more provided compositionLocals content = content ) } object MaterialTheme { val colors: Colors @Composable @ReadOnlyComposable get() = LocalColors.current val typography: Typography // same val shapes: Shapes // same }

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THEME - MATERIAL THEME @Composable fun MaterialTheme( colors: Colors = MaterialTheme.colors, typography: Typography = MaterialTheme.typography, shapes: Shapes = MaterialTheme.shapes, content: @Composable () -> Unit ) { CompositionLocalProvider( LocalColors provides colors, // more provided compositionLocals content = content ) } object MaterialTheme { val colors: Colors @Composable @ReadOnlyComposable get() = LocalColors.current val typography: Typography // same val shapes: Shapes // same } internal val LocalColors = staticCompositionLocalOf { error("LocalColors was not provided") }

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THEME - MATERIAL THEME @Composable fun MaterialTheme( colors: Colors = MaterialTheme.colors, typography: Typography = MaterialTheme.typography, shapes: Shapes = MaterialTheme.shapes, content: @Composable () -> Unit ) { CompositionLocalProvider( LocalColors provides colors, // more provided compositionLocals content = content ) } object MaterialTheme { val colors: Colors @Composable @ReadOnlyComposable get() = LocalColors.current val typography: Typography // same val shapes: Shapes // same } internal val LocalColors = staticCompositionLocalOf { error("LocalColors was not provided") }

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THEME - MATERIAL THEME @Composable fun MaterialTheme( colors: Colors = MaterialTheme.colors, typography: Typography = MaterialTheme.typography, shapes: Shapes = MaterialTheme.shapes, content: @Composable () -> Unit ) { CompositionLocalProvider( LocalColors provides colors, // more provided compositionLocals content = content ) } object MaterialTheme { val colors: Colors @Composable @ReadOnlyComposable get() = LocalColors.current val typography: Typography // same val shapes: Shapes // same } internal val LocalColors = staticCompositionLocalOf { error("LocalColors was not provided") }

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THEME - COMPOSITIONLOCALS

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FULLY-CUSTOM THEME

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) }

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) }

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) }

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) }

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) }

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) }

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) }

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) }

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) } object OZTheme { val isDarkMode: Boolean @Composable get() = LocalIsDarkMode.current val isGeneralMode: Boolean @Composable get() = LocalIsGeneralMode.current val colors: OZColors @Composable get() = LocalOZColors.current val generalColors: OZGeneralColors @Composable get() = LocalOZGeneralColors.current val typography: OZTypography @Composable get() = LocalOZTypography.current val shapes: OZShapes @Composable get() = LocalOZShapes.current }

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) } object OZTheme { val isDarkMode: Boolean @Composable get() = LocalIsDarkMode.current val isGeneralMode: Boolean @Composable get() = LocalIsGeneralMode.current val colors: OZColors @Composable get() = LocalOZColors.current val generalColors: OZGeneralColors @Composable get() = LocalOZGeneralColors.current val typography: OZTypography @Composable get() = LocalOZTypography.current val shapes: OZShapes @Composable get() = LocalOZShapes.current }

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THEME - FULLY-CUSTOM THEME @Composable fun OZTheme( isDarkMode: Boolean = isSystemInDarkTheme(), isGeneralMode: Boolean = false, content: @Composable () -> Unit, ) { val colors = if (isDarkMode) ozDarkColors else ozLightColors val generalColors = ozGeneralColors val typography = OZTypography() val shapes = OZShapes() CompositionLocalProvider( LocalOZColors provides colors, LocalOZGeneralColors provides generalColors, LocalOZTypography provides typography, LocalOZShapes provides shapes, LocalIsDarkMode provides isDarkMode, LocalIsGeneralMode provides isGeneralMode, content = content ) } object OZTheme { val isDarkMode: Boolean @Composable get() = LocalIsDarkMode.current val isGeneralMode: Boolean @Composable get() = LocalIsGeneralMode.current val colors: OZColors @Composable get() = LocalOZColors.current val generalColors: OZGeneralColors @Composable get() = LocalOZGeneralColors.current val typography: OZTypography @Composable get() = LocalOZTypography.current val shapes: OZShapes @Composable get() = LocalOZShapes.current }

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THEME - CONCLUSION • Use Material Theme as your Design System if it’s enough for you • Have your designers build your brand aka Design System • Translate Your Design System into your own Fully Custom Theme

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TIMELINE Navigation Full Screens Interop Components Theme Questions?

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TIMELINE Navigation Full Screens Interop Components Theme

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BUILDING A COMPONENT

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COMPONENTS - STEP PROGRESS BAR

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COMPONENTS - STEP PROGRESS BAR @Composable fun StepProgressBar( modi fi er: Modi fi er = Modi fi er, variant: StepProgressBarVariant = StepProgressBarVariant.Regular, numberOfSteps: Int, currentStep: Int ) { // some code here }

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COMPONENTS - STEP PROGRESS BAR @Composable fun StepProgressBar( modi fi er: Modi fi er = Modi fi er, variant: StepProgressBarVariant = StepProgressBarVariant.Regular, numberOfSteps: Int, currentStep: Int ) { // some code here }

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COMPONENTS - STEP PROGRESS BAR @Composable fun StepProgressBar( modi fi er: Modi fi er = Modi fi er, variant: StepProgressBarVariant = StepProgressBarVariant.Regular, numberOfSteps: Int, currentStep: Int ) { // some code here }

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COMPONENTS - STEP PROGRESS BAR @Composable fun StepProgressBar( modi fi er: Modi fi er = Modi fi er, variant: StepProgressBarVariant = StepProgressBarVariant.Regular, numberOfSteps: Int, currentStep: Int ) { // some code here }

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COMPONENTS - STEP PROGRESS BAR enum class StepProgressBarVariant( val completedStepColor: Color, val unCompletedStepColor: Color, ) { Regular( completedStepColor = OZTheme.colors.buttonsPrimaryRegular, unCompletedStepColor = OZTheme.colors.systemGrayGray5 ), }

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COMPONENTS - STEP PROGRESS BAR enum class StepProgressBarVariant( val completedStepColor: Color, val unCompletedStepColor: Color, ) { Regular( completedStepColor = OZTheme.colors.buttonsPrimaryRegular, unCompletedStepColor = OZTheme.colors.systemGrayGray5 ), } Looks good?

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COMPONENTS - STEP PROGRESS BAR enum class StepProgressBarVariant( val completedStepColor: Color, val unCompletedStepColor: Color, ) { Regular( completedStepColor = OZTheme.colors.buttonsPrimaryRegular, unCompletedStepColor = OZTheme.colors.systemGrayGray5 ), } Looks good, but doesn’t work

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COMPONENTS - STEP PROGRESS BAR

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COMPONENTS - STEP PROGRESS BAR enum class StepProgressBarVariant( val completedStepColor: Color, val unCompletedStepColor: Color, ) { Regular( completedStepColor = OZTheme.colors.buttonsPrimaryRegular, unCompletedStepColor = OZTheme.colors.systemGrayGray5 ), } HOW DO WE FIX THIS?

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COMPONENTS - STEP PROGRESS BAR enum class StepProgressBarVariant( val completedStepColor: @Composable () -> Color, val unCompletedStepColor: @Composable () -> Color, ) { Regular( completedStepColor = { OZTheme.colors.buttonsPrimaryRegular }, unCompletedStepColor = { OZTheme.colors.systemGrayGray5 } ), }

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COMPONENTS - STEP PROGRESS BAR @Composable fun StepProgressBar( modi fi er: Modi fi er = Modi fi er, variant: StepProgressBarVariant = StepProgressBarVariant.Regular, numberOfSteps: Int, currentStep: Int ) { // some code here }

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COMPONENTS - STEP PROGRESS BAR @Composable fun StepProgressBar( modi fi er: Modi fi er = Modi fi er, variant: StepProgressBarVariant = StepProgressBarVariant.Regular, numberOfSteps: Int, currentStep: Int ) { // some code here }

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COMPONENTS - STEP PROGRESS BAR @Composable fun StepProgressBar( modi fi er: Modi fi er = Modi fi er, variant: StepProgressBarVariant = StepProgressBarVariant.Regular, numberOfSteps: Int, currentStep: Int ) { // some code here }

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COMPONENTS - STEP PROGRESS BAR { Row( modi fi er = modi fi er .width(230.dp), verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.Center, ) { // more code here } }

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COMPONENTS - STEP PROGRESS BAR { Row( modi fi er = modi fi er .width(230.dp), verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.Center, ) { // more code here } }

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COMPONENTS - STEP PROGRESS BAR { Row( modi fi er = modi fi er .width(230.dp), verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.Center, ) { // more code here } }

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COMPONENTS - STEP PROGRESS BAR for (step in 0 until numberOfSteps) { Step( completed = step < currentStep, completedColor = variant.completedStepColor(), unCompletedColor = variant.unCompletedStepColor(), modi fi er = Modi fi er .weight(1F), ) if (step < numberOfSteps - 1) { Spacer(modi fi er = Modi fi er.width(5.dp)) } }

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COMPONENTS - STEP PROGRESS BAR for (step in 0 until numberOfSteps) { Step( completed = step < currentStep, completedColor = variant.completedStepColor(), unCompletedColor = variant.unCompletedStepColor(), modi fi er = Modi fi er .weight(1F), ) if (step < numberOfSteps - 1) { Spacer(modi fi er = Modi fi er.width(5.dp)) } }

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COMPONENTS - STEP PROGRESS BAR for (step in 0 until numberOfSteps) { Step( completed = step < currentStep, completedColor = variant.completedStepColor(), unCompletedColor = variant.unCompletedStepColor(), modi fi er = Modi fi er .weight(1F), ) if (step < numberOfSteps - 1) { Spacer(modi fi er = Modi fi er.width(5.dp)) } }

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COMPONENTS - STEP PROGRESS BAR for (step in 0 until numberOfSteps) { Step( completed = step < currentStep, completedColor = variant.completedStepColor(), unCompletedColor = variant.unCompletedStepColor(), modi fi er = Modi fi er .weight(1F), ) if (step < numberOfSteps - 1) { Spacer(modi fi er = Modi fi er.width(5.dp)) } }

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COMPONENTS - STEP PROGRESS BAR for (step in 0 until numberOfSteps) { Step( completed = step < currentStep, completedColor = variant.completedStepColor(), unCompletedColor = variant.unCompletedStepColor(), modi fi er = Modi fi er .weight(1F), ) if (step < numberOfSteps - 1) { Spacer(modi fi er = Modi fi er.width(5.dp)) } }

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COMPONENTS - STEP PROGRESS BAR for (step in 0 until numberOfSteps) { Step( completed = step < currentStep, completedColor = variant.completedStepColor(), unCompletedColor = variant.unCompletedStepColor(), modi fi er = Modi fi er .weight(1F), ) if (step < numberOfSteps - 1) { Spacer(modi fi er = Modi fi er.width(5.dp)) } }

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COMPONENTS - STEP PROGRESS BAR @Composable fun Step( modi fi er: Modi fi er = Modi fi er, completed: Boolean, completedColor: Color, unCompletedColor: Color ) { Divider( modi fi er = modi fi er .width(20.dp) .clip(OZTheme.shapes.cornerRadius50percent), color = if (completed) completedColor else unCompletedColor, thickness = 2.dp ) }

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COMPONENTS - STEP PROGRESS BAR @Composable fun Step( modi fi er: Modi fi er = Modi fi er, completed: Boolean, completedColor: Color, unCompletedColor: Color ) { Divider( modi fi er = modi fi er .width(20.dp) .clip(OZTheme.shapes.cornerRadius50percent), color = if (completed) completedColor else unCompletedColor, thickness = 2.dp ) }

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COMPONENTS - STEP PROGRESS BAR @Composable fun Step( modi fi er: Modi fi er = Modi fi er, completed: Boolean, completedColor: Color, unCompletedColor: Color ) { Divider( modi fi er = modi fi er .width(20.dp) .clip(OZTheme.shapes.cornerRadius50percent), color = if (completed) completedColor else unCompletedColor, thickness = 2.dp ) }

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COMPONENTS - STEP PROGRESS BAR @Composable fun Step( modi fi er: Modi fi er = Modi fi er, completed: Boolean, completedColor: Color, unCompletedColor: Color ) { Divider( modi fi er = modi fi er .width(20.dp) .clip(OZTheme.shapes.cornerRadius50percent), color = if (completed) completedColor else unCompletedColor, thickness = 2.dp ) }

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COMPONENTS - STEP PROGRESS BAR @Composable fun Step( modi fi er: Modi fi er = Modi fi er, completed: Boolean, completedColor: Color, unCompletedColor: Color ) { Divider( modi fi er = modi fi er .width(20.dp) .clip(OZTheme.shapes.cornerRadius50percent), color = if (completed) completedColor else unCompletedColor, thickness = 2.dp ) }

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COMPONENTS - STEP PROGRESS BAR @Composable fun Step( modi fi er: Modi fi er = Modi fi er, completed: Boolean, completedColor: Color, unCompletedColor: Color ) { Divider( modi fi er = modi fi er .width(20.dp) .clip(OZTheme.shapes.cornerRadius50percent), color = if (completed) completedColor else unCompletedColor, thickness = 2.dp ) }

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COMPONENTS - STEP PROGRESS BAR @Preview(name = "Step Progress Bar / Light Mode", showBackground = true, uiMode = Con fi guration.UI_MODE_NIGHT_NO) @Preview(name = "Step Progress Bar / Dark Mode", showBackground = true, uiMode = Con fi guration.UI_MODE_NIGHT_YES) @Composable fun StepProgressBarPreview() { OZTheme { StepProgressBar(numberOfSteps = 10, currentStep = 2) } } @Preview(name = "Step Progress Bar / General Mode", showBackground = true, uiMode = Con fi guration.UI_MODE_NIGHT_YES) @Composable fun StepProgressBarGeneralPreview() { OZTheme(isGeneralMode = true) { StepProgressBar(numberOfSteps = 6, currentStep = 3) } }

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COMPONENTS - STEP PROGRESS BAR

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TESTING

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COMPONENTS - TESTING https://github.com/cashapp/paparazzi

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COMPONENTS - TESTING class StepProgressBarViewTest { @get:Rule val paparazzi = Paparazzi( theme = "android:Theme.AppCompat", deviceCon fi g = DeviceCon fi g.NEXUS_5, ) // screenshot tests here }

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COMPONENTS - TESTING class StepProgressBarViewTest { @get:Rule val paparazzi = Paparazzi( theme = "android:Theme.AppCompat", deviceCon fi g = DeviceCon fi g.NEXUS_5, ) // screenshot tests here }

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COMPONENTS - TESTING @Test fun sixStepsTwoCompleted() { paparazzi.snapshot { OZTheme { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, modi fi er = Modi fi er . fi llMaxSize() .background(backgroundColor), ) { StepProgressBar( modi fi er = Modi fi er.background(componentBackgroundColor), numberOfSteps = 6, currentStep = 2, ) } } } }

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COMPONENTS - TESTING @Test fun sixStepsTwoCompleted() { paparazzi.snapshot { OZTheme { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, modi fi er = Modi fi er . fi llMaxSize() .background(backgroundColor), ) { StepProgressBar( modi fi er = Modi fi er.background(componentBackgroundColor), numberOfSteps = 6, currentStep = 2, ) } } } }

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COMPONENTS - TESTING @Test fun sixStepsTwoCompleted() { paparazzi.snapshot { OZTheme { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, modi fi er = Modi fi er . fi llMaxSize() .background(backgroundColor), ) { StepProgressBar( modi fi er = Modi fi er.background(componentBackgroundColor), numberOfSteps = 6, currentStep = 2, ) } } } }

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COMPONENTS - TESTING @Test fun sixStepsTwoCompleted() { paparazzi.snapshot { OZTheme { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, modi fi er = Modi fi er . fi llMaxSize() .background(backgroundColor), ) { StepProgressBar( modi fi er = Modi fi er.background(componentBackgroundColor), numberOfSteps = 6, currentStep = 2, ) } } } }

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COMPONENTS - TESTING @Test fun sixStepsTwoCompleted() { paparazzi.snapshot { OZTheme { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, modi fi er = Modi fi er . fi llMaxSize() .background(backgroundColor), ) { StepProgressBar( modi fi er = Modi fi er.background(componentBackgroundColor), numberOfSteps = 6, currentStep = 2, ) } } } }

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COMPONENTS - TESTING @Test fun sixStepsTwoCompleted() { paparazzi.snapshot { OZTheme { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, modi fi er = Modi fi er . fi llMaxSize() .background(backgroundColor), ) { StepProgressBar( modi fi er = Modi fi er.background(componentBackgroundColor), numberOfSteps = 6, currentStep = 2, ) } } } }

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COMPONENTS - TESTING @Test fun sixStepsTwoCompleted() { paparazzi.snapshot { OZTheme { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, modi fi er = Modi fi er . fi llMaxSize() .background(backgroundColor), ) { StepProgressBar( modi fi er = Modi fi er.background(componentBackgroundColor), numberOfSteps = 6, currentStep = 2, ) } } } }

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COMPONENTS - TESTING @Test fun sixStepsTwoCompleted() { paparazzi.snapshot { OZTheme { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, modi fi er = Modi fi er . fi llMaxSize() .background(backgroundColor), ) { StepProgressBar( modi fi er = Modi fi er.background(componentBackgroundColor), numberOfSteps = 6, currentStep = 2, ) } } } }

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COMPONENTS - TESTING ./gradlew recordPaparazziDebug

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COMPONENTS - TESTING ./gradlew verifyPaparazziDebug

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COMPONENTS - TESTING ./gradlew verifyPaparazziDebug

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COMPONENTS - TESTING ./gradlew verifyPaparazziDebug

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COMPONENTS - CONCLUSION • Translate design needs into the right parameters like a “Variant” • We can’t call something @Composable inside enums or classes but we can hold a Composable lambda • Use cashapp/paparazzi to screenshot-test your components

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TIMELINE Navigation Full Screens Interop Components Theme Questions?

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TIMELINE Navigation Full Screens Interop Components Theme

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USING COMPONENTS

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INTEROP - USING COMPONENTS

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INTEROP - USING COMPONENTS

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INTEROP - USING COMPONENTS

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INTEROP - USING COMPONENTS binding.stepProgressBar.setOZContent(forceLtr = false) { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, ) { StepProgressBar( numberOfSteps = numberOfSteps, currentStep = currentStep ) } }

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INTEROP - USING COMPONENTS binding.stepProgressBar.setOZContent(forceLtr = false) { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, ) { StepProgressBar( numberOfSteps = numberOfSteps, currentStep = currentStep ) } }

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INTEROP - USING COMPONENTS binding.stepProgressBar.setOZContent(forceLtr = false) { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, ) { StepProgressBar( numberOfSteps = numberOfSteps, currentStep = currentStep ) } }

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INTEROP - USING COMPONENTS binding.stepProgressBar.setOZContent(forceLtr = false) { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, ) { StepProgressBar( numberOfSteps = numberOfSteps, currentStep = currentStep ) } }

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INTEROP - USING COMPONENTS binding.stepProgressBar.setOZContent(forceLtr = false) { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, ) { StepProgressBar( numberOfSteps = numberOfSteps, currentStep = currentStep ) } }

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INTEROP - USING COMPONENTS binding.stepProgressBar.setOZContent(forceLtr = false) { Column( verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally, ) { StepProgressBar( numberOfSteps = numberOfSteps, currentStep = currentStep ) } }

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INTEROP - USING COMPONENTS fun ComposeView.setOZContent( forceLtr: Boolean = true, content: @Composable () -> Unit, ) { setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed) setContent { OZTheme { val direction = if (forceLtr) LayoutDirection.Ltr else LocalLayoutDirection.current CompositionLocalProvider( LocalLayoutDirection provides direction, content = content ) } } }

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INTEROP - USING COMPONENTS fun ComposeView.setOZContent( forceLtr: Boolean = true, content: @Composable () -> Unit, ) { setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed) setContent { OZTheme { val direction = if (forceLtr) LayoutDirection.Ltr else LocalLayoutDirection.current CompositionLocalProvider( LocalLayoutDirection provides direction, content = content ) } } }

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INTEROP - USING COMPONENTS fun ComposeView.setOZContent( forceLtr: Boolean = true, content: @Composable () -> Unit, ) { setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed) setContent { OZTheme { val direction = if (forceLtr) LayoutDirection.Ltr else LocalLayoutDirection.current CompositionLocalProvider( LocalLayoutDirection provides direction, content = content ) } } }

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INTEROP - USING COMPONENTS fun ComposeView.setOZContent( forceLtr: Boolean = true, content: @Composable () -> Unit, ) { setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed) setContent { OZTheme { val direction = if (forceLtr) LayoutDirection.Ltr else LocalLayoutDirection.current CompositionLocalProvider( LocalLayoutDirection provides direction, content = content ) } } }

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INTEROP - USING COMPONENTS fun ComposeView.setOZContent( forceLtr: Boolean = true, content: @Composable () -> Unit, ) { setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed) setContent { OZTheme { val direction = if (forceLtr) LayoutDirection.Ltr else LocalLayoutDirection.current CompositionLocalProvider( LocalLayoutDirection provides direction, content = content ) } } }

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INTEROP - USING COMPONENTS fun ComposeView.setOZContent( forceLtr: Boolean = true, content: @Composable () -> Unit, ) { setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed) setContent { OZTheme { val direction = if (forceLtr) LayoutDirection.Ltr else LocalLayoutDirection.current CompositionLocalProvider( LocalLayoutDirection provides direction, content = content ) } } }

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INTEROP - USING COMPONENTS fun ComposeView.setOZContent( forceLtr: Boolean = true, content: @Composable () -> Unit, ) { setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed) setContent { OZTheme { val direction = if (forceLtr) LayoutDirection.Ltr else LocalLayoutDirection.current CompositionLocalProvider( LocalLayoutDirection provides direction, content = content ) } } }

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INTEROP - USING COMPONENTS fun ComposeView.setOZContent( forceLtr: Boolean = true, content: @Composable () -> Unit, ) { setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed) setContent { OZTheme { val direction = if (forceLtr) LayoutDirection.Ltr else LocalLayoutDirection.current CompositionLocalProvider( LocalLayoutDirection provides direction, content = content ) } } }

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INTEROP - CONCLUSION • Build your helper functions to make it easy to use • Do not forget setViewCompositionStrategy()

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TIMELINE Navigation Full Screens Interop Components Theme Questions?

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TIMELINE Navigation Full Screens Interop Components Theme

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COMPOSE BASE FRAGMENTS

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FULL SCREENS - BASE FRAGMENTS abstract class ComposeFragment : Fragment() { protected open val isThemeInGeneralMode: Boolean = false override fun onCreateView(in fl ater: LayoutIn fl ater, c: ViewGroup?, sub: Bundle?): View? { return setOZContent(isThemeInGeneralMode) { ComposeContent() } } @Composable protected abstract fun ComposeContent() }

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FULL SCREENS - BASE FRAGMENTS abstract class ComposeFragment : Fragment() { protected open val isThemeInGeneralMode: Boolean = false override fun onCreateView(in fl ater: LayoutIn fl ater, c: ViewGroup?, sub: Bundle?): View? { return setOZContent(isThemeInGeneralMode) { ComposeContent() } } @Composable protected abstract fun ComposeContent() }

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FULL SCREENS - BASE FRAGMENTS abstract class ComposeFragment : Fragment() { protected open val isThemeInGeneralMode: Boolean = false override fun onCreateView(in fl ater: LayoutIn fl ater, c: ViewGroup?, sub: Bundle?): View? { return setOZContent(isThemeInGeneralMode) { ComposeContent() } } @Composable protected abstract fun ComposeContent() }

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FULL SCREENS - BASE FRAGMENTS abstract class ComposeFragment : Fragment() { protected open val isThemeInGeneralMode: Boolean = false override fun onCreateView(in fl ater: LayoutIn fl ater, c: ViewGroup?, sub: Bundle?): View? { return setOZContent(isThemeInGeneralMode) { ComposeContent() } } @Composable protected abstract fun ComposeContent() }

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FULL SCREENS - BASE FRAGMENTS abstract class ComposeFragment : Fragment() { protected open val isThemeInGeneralMode: Boolean = false override fun onCreateView(in fl ater: LayoutIn fl ater, c: ViewGroup?, sub: Bundle?): View? { return setOZContent(isThemeInGeneralMode) { ComposeContent() } } @Composable protected abstract fun ComposeContent() }

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FULL SCREENS - BASE FRAGMENTS abstract class ComposeFragment : Fragment() { protected open val isThemeInGeneralMode: Boolean = false override fun onCreateView(in fl ater: LayoutIn fl ater, c: ViewGroup?, sub: Bundle?): View? { return setOZContent(isThemeInGeneralMode) { ComposeContent() } } @Composable protected abstract fun ComposeContent() }

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FULL SCREENS - BASE FRAGMENTS abstract class ComposeFragment : Fragment() { protected open val isThemeInGeneralMode: Boolean = false override fun onCreateView(in fl ater: LayoutIn fl ater, c: ViewGroup?, sub: Bundle?): View? { return setOZContent(isThemeInGeneralMode) { ComposeContent() } } @Composable protected abstract fun ComposeContent() }

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FULL SCREENS - BASE FRAGMENTS abstract class ComposeFragment : Fragment() { protected open val isThemeInGeneralMode: Boolean = false override fun onCreateView(in fl ater: LayoutIn fl ater, c: ViewGroup?, sub: Bundle?): View? { return setOZContent(isThemeInGeneralMode) { ComposeContent() } } @Composable protected abstract fun ComposeContent() }

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USING BASE FRAGMENT

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FULL SCREENS - USING BASE FRAGMENT class SomeComposeFragment: ComposeFragment() { @Composable override fun ComposeContent() { TestComposeScreen() } }

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FULL SCREENS - USING BASE FRAGMENT class SomeComposeFragment: ComposeFragment() { @Composable override fun ComposeContent() { TestComposeScreen() } }

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FULL SCREENS - USING BASE FRAGMENT class SomeComposeFragment: ComposeFragment() { @Composable override fun ComposeContent() { TestComposeScreen() } }

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FULL SCREENS - USING BASE FRAGMENT class SomeComposeFragment: ComposeFragment() { @Composable override fun ComposeContent() { TestComposeScreen() } }

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FULL SCREENS - USING BASE FRAGMENT fun TestComposeScreen(testViewModel: TestMVIViewModel = viewModel()) { val uiState by testViewModel.uiState.collectAsState() Column(modi fi er = Modi fi er. fi llMaxSize()) { when (uiState) { TestUiState.Initial -> Text("Initial State") TestUiState.SecondState -> Text("Second State") } } }

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FULL SCREENS - USING BASE FRAGMENT fun TestComposeScreen(testViewModel: TestMVIViewModel = viewModel()) { val uiState by testViewModel.uiState.collectAsState() Column(modi fi er = Modi fi er. fi llMaxSize()) { when (uiState) { TestUiState.Initial -> Text("Initial State") TestUiState.SecondState -> Text("Second State") } } }

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FULL SCREENS - USING BASE FRAGMENT fun TestComposeScreen(testViewModel: TestMVIViewModel = viewModel()) { val uiState by testViewModel.uiState.collectAsState() Column(modi fi er = Modi fi er. fi llMaxSize()) { when (uiState) { TestUiState.Initial -> Text("Initial State") TestUiState.SecondState -> Text("Second State") } } }

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FULL SCREENS - USING BASE FRAGMENT fun TestComposeScreen(testViewModel: TestMVIViewModel = viewModel()) { val uiState by testViewModel.uiState.collectAsState() Column(modi fi er = Modi fi er. fi llMaxSize()) { when (uiState) { TestUiState.Initial -> Text("Initial State") TestUiState.SecondState -> Text("Second State") } } }

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FULL SCREENS - USING BASE FRAGMENT fun TestComposeScreen(testViewModel: TestMVIViewModel = viewModel()) { val uiState by testViewModel.uiState.collectAsState() Column(modi fi er = Modi fi er. fi llMaxSize()) { when (uiState) { TestUiState.Initial -> Text("Initial State") TestUiState.SecondState -> Text("Second State") } } }

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FULL SCREENS - USING BASE FRAGMENT class SomeComposeFragment: ComposeFragment() { @Composable override fun ComposeContent() { TestComposeScreen() } }

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TIMELINE Navigation Full Screens Interop Components Theme Questions?

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TIMELINE Navigation Full Screens Interop Components Theme

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NAVIGATION

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NAVIGATION • Jetpack Navigation for Compose • Compose-destinations by Rafael Costa (1.3k stars on Github) • Voyager by Adiel Café (659 stars on Github)

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TIMELINE Navigation Full Screens Interop Components Theme Questions?

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TIMELINE Navigation Full Screens Interop Components Theme

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QUESTIONS?

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THANK YOU! Alexander Gherschon 
 Android Tech Lead @ ONE ZERO Digital Bank Blog - https://galex.co.il/ Twitter - https://twitter.com/galex Github - https://github.com/galex Linkedin - https://www.linkedin.com/in/agherschon/