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@GerardPaligot DISCOVERING JETPACK COMPOSE

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WHAT’S JETPACK COMPOSE? 100% Kotlin Compiler Open Source Declarative UI toolkit Android Team

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THINK DIFFERENT.

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MovieMetadata Rating TopAppBar Poster PosterNoted MovieItem

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App MovieHome Home Section Home Section Home Section Data Events

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App MovieHome Home Section Home Section Home Section Data Events

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PLACING ELEMENTS

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Text( text = title ) }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Text( text = title, style = MaterialTheme.typography.h6 ) }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Text( text = title, style = MaterialTheme.typography.h6, maxLines = 2, overflow = TextOverflow.Ellipsis ) }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Column { Text( text = title, style = MaterialTheme.typography.h6, maxLines = 2, overflow = TextOverflow.Ellipsis ) } }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Column { Text(...) } }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Column { Text(...) genres.forEach { Tag(text = it) } } }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Column { Text(...) Row { genres.forEach { Tag(text = it) } } } }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Column { Text(...) Row(modifier = Modifier.padding(top = 5.dp)) { genres.forEach { Tag(text = it) } } } }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Column { Text(...) Row(modifier = Modifier.padding(top = 5.dp)) { ... } } }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Column { Text(...) Row(modifier = Modifier.padding(top = 5.dp)) { ... } val year = releaseDate.getCalendar().get(Calendar.YEAR) val time = "${runtime / 60}h ${runtime % 60}min" Text( text ="$year - $time", modifier = Modifier.padding(top = 5.dp) ) } }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Column { Text(...) Row(modifier = Modifier.padding(top = 5.dp)) { ... } val year = releaseDate.getCalendar().get(Calendar.YEAR) val time = "${runtime / 60}h ${runtime % 60}min" Text( text = if (runtime != 0) "$year - $time" else "$year", modifier = Modifier.padding(top = 5.dp) ) } }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Column { Text(...) Row(modifier = Modifier.padding(top = 5.dp)) { ... } CompositionLocalProvider( LocalContentAlpha provides ContentAlpha.medium ) { val year = releaseDate.getCalendar().get(Calendar.YEAR) val time = "${runtime / 60}h ${runtime % 60}min" Text( text = if (runtime != 0) "$year - $time" else "$year", modifier = Modifier.padding(top = 5.dp) ) } } }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int ) { Column { Text(...) Row(modifier = Modifier.padding(top = 5.dp)) { ... } CompositionLocalProvider( LocalContentAlpha provides ContentAlpha.medium ) { ... } } }

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@Composable fun MovieMetadata( title: String, genres: List, releaseDate: String, runtime: Int, modifier: Modifier = Modifier ) { Column(modifier = modifier) { Text(...) Row(modifier = Modifier.padding(top = 5.dp)) { ... } CompositionLocalProvider( LocalContentAlpha provides ContentAlpha.medium ) { ... } } }

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LET’S CODE A LIST

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@Composable fun PosterNoted( posterUrl: String, voteAverage: Int, ratingSize: Dp, ratingAlignment: Alignment, onClick: () -> Unit = {} )

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@Composable fun MovieItem( movie: Movie, modifier: Modifier = Modifier, onClick: (movie: Movie) -> Unit ) { }

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@Composable fun MovieItem( movie: Movie, modifier: Modifier = Modifier, onClick: (movie: Movie) -> Unit ) { PosterNoted( posterUrl = movie.pictureUrl, voteAverage = movie.percentage, ratingSize = 50.dp, ratingAlignment = Alignment.TopEnd ) }

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@Composable fun MovieItem( movie: Movie, modifier: Modifier = Modifier, onClick: (movie: Movie) -> Unit ) { Box( modifier = Modifier .width(130.dp) .aspectRatio(0.7f) ) { PosterNoted( posterUrl = movie.pictureUrl, voteAverage = movie.percentage, ratingSize = 50.dp, ratingAlignment = Alignment.TopEnd ) } }

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@Composable fun MovieItem( movie: Movie, modifier: Modifier = Modifier, onClick: (movie: Movie) -> Unit ) { Box( modifier = Modifier .width(130.dp) .aspectRatio(0.7f) ) { … } }

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@Composable fun MovieItem( movie: Movie, modifier: Modifier = Modifier, onClick: (movie: Movie) -> Unit ) { Box(modifier = modifier) { Box( modifier = Modifier .width(130.dp) .aspectRatio(0.7f) ) { ... } } }

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@Composable fun MovieItem( movie: Movie, modifier: Modifier = Modifier, onClick: (movie: Movie) -> Unit ) { val posterWidth = 130 val height = (posterWidth / 0.7f).roundToInt() Box(modifier = modifier) { Surface( modifier = Modifier .fillMaxWidth() .preferredHeight((height - 30).dp) ) { } Box( modifier = Modifier .width(posterWidth.dp) .aspectRatio(0.7f) ) { ... } } }

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@Composable fun MovieItem( movie: Movie, modifier: Modifier = Modifier, onClick: (movie: Movie) -> Unit ) { val posterWidth = 130 val height = (posterWidth / 0.7f).roundToInt() Box(modifier = modifier) { Surface( modifier = Modifier .padding(top = 60.dp) .fillMaxWidth() .preferredHeight((height - 30).dp) ) { } Box( modifier = Modifier .width(posterWidth.dp) .aspectRatio(0.7f) ) { ... } } }

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@Composable fun MovieItem( movie: Movie, modifier: Modifier = Modifier, onClick: (movie: Movie) -> Unit ) { val posterWidth = 130 val height = (posterWidth / 0.7f).roundToInt() Box(modifier = modifier) { Surface( modifier = Modifier .padding(top = 60.dp) .fillMaxWidth() .preferredHeight((height - 30).dp) .clickable(onClick = { onClick(movie) }) ) { } Box( modifier = Modifier .width(posterWidth.dp) .aspectRatio(0.7f) ) { ... } } }

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@Composable fun MovieItem( movie: Movie, modifier: Modifier = Modifier, onClick: (movie: Movie) -> Unit ) { val posterWidth = 130 val height = (posterWidth / 0.7f).roundToInt() Box(modifier = modifier) { Surface( modifier = Modifier .padding(top = 60.dp) .fillMaxWidth() .preferredHeight((height - 30).dp) .clickable(onClick = { onClick(movie) }), shape = RoundedCornerShape(8.dp) ) { } Box( modifier = Modifier .width(posterWidth.dp) .aspectRatio(0.7f) ) { ... } } }

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@Composable fun MovieItem( movie: Movie, modifier: Modifier = Modifier, onClick: (movie: Movie) -> Unit ) { val posterWidth = 130 val height = (posterWidth / 0.7f).roundToInt() Box(modifier = modifier) { Surface( modifier = Modifier .padding(top = 60.dp) .fillMaxWidth() .preferredHeight((height - 30).dp) .clickable(onClick = { onClick(movie) }), shape = RoundedCornerShape(8.dp), elevation = 5.dp ) { } Box( modifier = Modifier .width(posterWidth.dp) .aspectRatio(0.7f) ) { ... } } }

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val posterWidth = 130 val height = (posterWidth / 0.7f).roundToInt() Box(modifier = modifier) { Surface( modifier = Modifier .padding(top = 60.dp) .fillMaxWidth() .preferredHeight((height - 30).dp) .clickable(onClick = { onClick(movie) }), shape = RoundedCornerShape(8.dp), elevation = 5.dp ) { } Box( modifier = Modifier .width(posterWidth.dp) .aspectRatio(0.7f) ) { ... } } }

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val posterWidth = 130 val height = (posterWidth / 0.7f).roundToInt() Box(modifier = modifier) { Surface( modifier = Modifier .padding(top = 60.dp) .fillMaxWidth() .preferredHeight((height - 30).dp) .clickable(onClick = { onClick(movie) }), shape = RoundedCornerShape(8.dp), elevation = 5.dp ) { } Box( modifier = Modifier .padding(start = 30.dp) .width(posterWidth.dp) .aspectRatio(0.7f) ) { ... } } }

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val posterWidth = 130 val height = (posterWidth / 0.7f).roundToInt() Box(modifier = modifier) { Surface( modifier = Modifier .padding(top = 60.dp) .fillMaxWidth() .preferredHeight((height - 30).dp) .clickable(onClick = { onClick(movie) }), shape = RoundedCornerShape(8.dp), elevation = 5.dp ) { MovieMetadata( title = movie.title, genres = movie.genres, releaseDate = movie.releaseDate, runtime = movie.runtime, modifier = Modifier.padding(start = (posterWidth + 15).dp) .align(alignment = Alignment.CenterStart) ) } Box( modifier = Modifier .padding(start = 30.dp) .width(posterWidth.dp) .aspectRatio(0.7f) ) { ... } }

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@Composable fun MovieList( title: String, movies: List, onClick: (movie: Movie) -> Unit ) { }

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@Composable fun MovieList( title: String, movies: List, onClick: (movie: Movie) -> Unit ) { val state = rememberScrollState() Column(modifier = Modifier.verticalScroll(state = state)) { movies.forEach { MovieItem( movie = it, modifier = Modifier .padding(start = 10.dp, top = 10.dp, end = 10.dp), onClick = onClick ) } } }

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@Composable fun MovieList( title: String, movies: List, onClick: (movie: Movie) -> Unit ) { LazyColumn { items(movies) { movie -> MovieItem( movie = movie, modifier = Modifier .padding(start = 10.dp, top = 10.dp, end = 10.dp), onClick = onClick ) } } }

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@Composable fun MovieList( title: String, movies: List, onClick: (movie: Movie) -> Unit ) { MovieScaffold(title = title) { LazyColumn { items(movies) { movie -> MovieItem( movie = it, modifier = Modifier .padding(start = 10.dp, top = 10.dp, end = 10.dp), onClick = onClick ) } } } }

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@Composable fun Scaffold( modifier: Modifier = Modifier, scaffoldState: ScaffoldState = rememberScaffoldState(), topBar: @Composable () -> Unit = emptyContent(), bottomBar: @Composable () -> Unit = emptyContent(), snackbarHost: @Composable (SnackbarHostState) -> Unit = { SnackbarHost(it) }, floatingActionButton: @Composable () -> Unit = emptyContent(), floatingActionButtonPosition: FabPosition = FabPosition.End, isFloatingActionButtonDocked: Boolean = false, drawerContent: @Composable (ColumnScope.() -> Unit)? = null, drawerGesturesEnabled: Boolean = true, drawerShape: Shape = MaterialTheme.shapes.large, drawerElevation: Dp = DrawerConstants.DefaultElevation, drawerBackgroundColor: Color = MaterialTheme.colors.surface, drawerContentColor: Color = contentColorFor(drawerBackgroundColor), drawerScrimColor: Color = DrawerConstants.defaultScrimColor, backgroundColor: Color = MaterialTheme.colors.background, contentColor: Color = contentColorFor(backgroundColor), bodyContent: @Composable (PaddingValues) -> Unit )

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LET’S CODE A LIST WITH ACTUAL FRAMEWORK UI

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data class Activity( @DrawableRes val picture: Int, val displayName: String, val type: String, val price: Int ) class ActivityListAdapter(val items: MutableList) : RecyclerView.Adapter() { val onClick: LiveData get() = this._onClick private val _onClick: MutableLiveData by lazy { return@lazy MutableLiveData() }

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override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ActivityViewHolder = ActivityViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.item_activity, parent, false)) override fun getItemCount(): Int = items.size override fun onBindViewHolder(holder: ActivityViewHolder, position: Int) { val activity = items[position] holder.bind(activity, View.OnClickListener { _onClick.value = activity }) } fun update(items: List) { this.items.clear() this.items.addAll(items) notifyDataSetChanged() }

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class ActivityViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) { fun bind(activity: Activity, onClickListener: View.OnClickListener) { itemView.setOnClickListener(onClickListener) itemView.picture.setImageDrawable(ContextCompat.getDrawable(itemView.context, activity.picture)) itemView.name.text = activity.displayName itemView.type.text = activity.type val color = if (activity.price > 0) ContextCompat.getColor(itemView.context, R.color.green) else ContextCompat.getColor(itemView.context, R.color.red) itemView.price.setTextColor(color) } } }

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LIGHT DARK

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val orange800 = Color(255, 150, 29) val orange900 = Color(255, 118, 26) val blue400 = Color(26, 163, 255) private val LightColorPalette = lightColors( primary = orange900, primaryVariant = orange800, secondary = blue400, background = Color.White, surface = Color.White, onPrimary = Color.White, onSecondary = Color.Black, onBackground = Color.Black, onSurface = Color.Black, )

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val orange400 = Color(255, 205, 56) val blue800 = Color(0, 98, 203) val blue900 = Color(0, 68, 171) val grayDark = Color(45, 47, 49) private val DarkColorPalette = darkColors( primary = blue900, primaryVariant = blue800, secondary = orange400, background = grayDark, surface = grayDark, onPrimary = Color.White, onSecondary = Color.Black, onBackground = Color.White, onSurface = Color.White )

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val typography = Typography( h5 = TextStyle( fontFamily = FontFamily.Default, fontWeight = FontWeight.W700, fontSize = 24.sp ), subtitle1 = TextStyle( fontFamily = FontFamily.Default, fontWeight = FontWeight.W700, fontSize = 16.sp ), body1 = TextStyle( fontFamily = FontFamily.Default, fontWeight = FontWeight.Normal, fontSize = 16.sp ), caption = TextStyle( fontFamily = FontFamily.Default, fontWeight = FontWeight.W400, fontSize = 10.sp ) )

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val shapes = Shapes( small = RoundedCornerShape(2.dp), medium = RoundedCornerShape(4.dp), large = RoundedCornerShape(8.dp) )

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@Composable fun MaterialTheme( colors: Colors = MaterialTheme.colors, typography: Typography = MaterialTheme.typography, shapes: Shapes = MaterialTheme.shapes, content: @Composable () -> Unit )

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@Composable fun ExploringMoviesTheme( isDarkMode: Boolean = isSystemInDarkTheme(), content: @Composable() () -> Unit ) { }

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@Composable fun ExploringMoviesTheme( isDarkMode: Boolean = isSystemInDarkTheme(), content: @Composable() () -> Unit ) { MaterialTheme( content = content ) }

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@Composable fun ExploringMoviesTheme( isDarkMode: Boolean = isSystemInDarkTheme(), content: @Composable() () -> Unit ) { MaterialTheme( colors = if (isDarkMode) DarkColorPalette else LightColorPalette, content = content ) }

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@Composable fun ExploringMoviesTheme( isDarkMode: Boolean = isSystemInDarkTheme(), content: @Composable() () -> Unit ) { MaterialTheme( colors = if (isDarkMode) DarkColorPalette else LightColorPalette, typography = typography, content = content ) }

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@Composable fun ExploringMoviesTheme( isDarkMode: Boolean = isSystemInDarkTheme(), content: @Composable() () -> Unit ) { MaterialTheme( colors = if (isDarkMode) DarkColorPalette else LightColorPalette, typography = typography, shapes = shapes, content = content ) }

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@Composable fun MovieList( title: String, movies: List, onClick: (movie: Movie) -> Unit ) { MovieScaffold( title = title ){ LazyColumnFor(items = movies) { MovieItem( movie = it, modifier = Modifier .padding(start = 10.dp, top = 10.dp, end = 10.dp), onClick = onClick ) } } }

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@Composable fun MovieList( title: String, movies: List, isDarkModeActive: Boolean, switchDarkMode: () -> Unit = {}, onClick: (movie: Movie) -> Unit ) { MovieScaffold( title = title, isDarkModeActive = isDarkModeActive, switchDarkMode = switchDarkMode ){ LazyColumnFor(items = movies) { MovieItem( movie = it, modifier = Modifier .padding(start = 10.dp, top = 10.dp, end = 10.dp), onClick = onClick ) } } }

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setContent { val isSystemDark = isSystemInDarkTheme() }

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setContent { val isSystemDark = isSystemInDarkTheme() val isDarkModeState = remember { mutableStateOf(isSystemDark) } }

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setContent { val isSystemDark = isSystemInDarkTheme() val isDarkModeState = remember { mutableStateOf(isSystemDark) } ExploringMoviesTheme(isDarkMode = isDarkModeState.value) { } }

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setContent { val isSystemDark = isSystemInDarkTheme() val isDarkModeState = remember { mutableStateOf(isSystemDark) } ExploringMoviesTheme(isDarkMode = isDarkModeState.value) { App( isDarkModeActive = isDarkModeState.value ) } }

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setContent { val isSystemDark = isSystemInDarkTheme() val isDarkModeState = remember { mutableStateOf(isSystemDark) } ExploringMoviesTheme(isDarkMode = isDarkModeState.value) { App( isDarkModeActive = isDarkModeState.value, switchDarkMode = { isDarkModeState.value = !isDarkModeState.value } ) } }

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OBSERVING DATA WITH VIEWMODEL

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class MovieViewModel : ViewModel() { fun getPopulars() = flow { ... } fun getDailyTrending() = flow { ... } fun getUpComing() = flow { ... } fun getMovieDetail(movieId: Int) = flow { ... } }

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▸ LiveData.observeAsState() ▸ Flow.collectAsState() ▸ Observable.subscribeAsState()

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@Composable fun MyExample() { // Returns the same instance as long as the activity is alive, // just as if you grabbed the instance from an Activity or // Fragment val viewModel: MovieViewModel = viewModel() } @Composable fun MyExample2() { // Same instance as in MyExample val viewModel: MovieViewModel = viewModel() }

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@Composable fun MovieListViewModel( movieSection: MovieSection, isDarkModeActive: Boolean, switchDarkMode: () -> Unit = {}, onClick: (movie: Movie) -> Unit ) { MovieList( title = title, movies = movies.value, isDarkModeActive = isDarkModeActive, switchDarkMode = switchDarkMode, onClick = onClick ) }

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@Composable fun MovieListViewModel( movieSection: MovieSection, isDarkModeActive: Boolean, switchDarkMode: () -> Unit = {}, onClick: (movie: Movie) -> Unit ) { val viewModel: MovieViewModel = viewModel() MovieList( title = title, movies = movies.value, isDarkModeActive = isDarkModeActive, switchDarkMode = switchDarkMode, onClick = onClick ) }

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@Composable fun MovieListViewModel( movieSection: MovieSection, isDarkModeActive: Boolean, switchDarkMode: () -> Unit = {}, onClick: (movie: Movie) -> Unit ) { val viewModel: MovieViewModel = viewModel() val movies = when (movieSection) { MovieSection.UPCOMING -> viewModel.getUpComing() .collectAsState(initial = emptyList()) MovieSection.POPULAR -> viewModel.getPopulars() .collectAsState(initial = emptyList()) MovieSection.TRENDING -> viewModel.getDailyTrending() .collectAsState(initial = emptyList()) } MovieList( movies = movies.value, isDarkModeActive = isDarkModeActive, switchDarkMode = switchDarkMode, onClick = onClick ) }

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@GerardPaligot DISCOVERING JETPACK COMPOSE

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@GerardPaligot DISCOVERING COMPOSE MULTIPLATFORM

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UI/UX UI/UX UI/UX BUSINESS LOGIC AND CORE

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UI/UX UI/UX UI/UX BUSINESS LOGIC AND CORE ACTUAL ACTUAL ACTUAL

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BUSINESS LOGIC AND CORE ACTUAL ACTUAL ACTUAL COMPOSE MULTIPLATFORM

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BUSINESS LOGIC AND CORE ACTUAL ACTUAL ACTUAL COMPOSE MULTIPLATFORM

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UX UX UX BUSINESS LOGIC AND CORE ACTUAL ACTUAL ACTUAL COMPOSE MULTIPLATFORM

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COMPILER RUNTIME UI FOUNDATION-LAYOUT ANIMATION FOUNDATION MATERIAL 3 Transf m @C posable functi s Pro amming model, state management and runtime f the c pose c pil plugin Fundamental c p ents Basics lay ts like B , R and C umn C p ents animati s Basics c p ents and int acti s Implementati of Mat ial Design specificati s Implementati of Mat ial Y

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COMPILER RUNTIME UI FOUNDATION-LAYOUT ANIMATION FOUNDATION MATERIAL 3 Transf m @C posable functi s Pro amming model, state management and runtime f the c pose c pil plugin

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COMPILER RUNTIME UI FOUNDATION-LAYOUT ANIMATION FOUNDATION MATERIAL 3 Transf m @C posable functi s Pro amming model, state management and runtime f the c pose c pil plugin WEB-CORE-RUNTIME WEB-CORE WIDGETS Runtime dedicated to web apps to gen ate DOM tags Basics native web c p ents Modifi s and lay ts

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UX UX UX BUSINESS LOGIC AND CORE ACTUAL ACTUAL ACTUAL COMPOSE MULTIPLATFORM

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UX UX UX BUSINESS LOGIC AND CORE ACTUAL ACTUAL ACTUAL COMPOSE MULTIPLATFORM COMPOSE WEB

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WHY COMPOSE WEB? ▸ Compose Canvas rendering not compatible (yet) with web technologies ▸ Compose Web emit DOM UI for NPM librairies compatibility and SEO

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:android-app :desktop-app :data

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:android-app :desktop-app :data

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:android-app :desktop-app :data :components :theming

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:android-app :desktop-app :data :components :theming

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plugins { id("com.android.library") } android { ... }

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plugins { id("com.android.library") kotlin("multiplatform") id("org.jetbrains.compose") } android { ... }

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plugins { id("com.android.library") kotlin("multiplatform") id("org.jetbrains.compose") } android { ... } kotlin { android() jvm("desktop") }

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import org.jetbrains.compose.compose plugins { id("com.android.library") kotlin("multiplatform") id("org.jetbrains.compose") } android { ... } kotlin { android() jvm("desktop") sourceSets { named("commonMain") { dependencies { implementation(compose.runtime) implementation(compose.foundation) implementation(compose.material) } } } }

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SOURCE SET desktopMain SOURCE SET androidMain SOURCE SET commonMain

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@Composable expect fun Font( fontName: String, weight: FontWeight, style: FontStyle ): Font SOURCE SET commonMain

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@Composable actual fun Font( fontName: String, weight: FontWeight, style: FontStyle ): Font { val context = LocalContext.current val id = context.resources .getIdentifier(fontName, "font", context.packageName) return Font(id, weight, style) } SOURCE SET androidMain

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@Composable actual fun Font( fontName: String, weight: FontWeight, style: FontStyle ): Font { return androidx.compose.ui.text.platform.Font( "font/${fontName}.ttf", weight, style ) } SOURCE SET desktopMain

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object Fonts { val roboto: FontFamily @Composable get() = FontFamily( Font( "roboto_bold", FontWeight.Bold, FontStyle.Normal ), Font( "roboto_italic", FontWeight.Normal, FontStyle.Italic ), Font( "roboto_regular", FontWeight.Normal, FontStyle.Normal ) ) } SOURCE SET commonMain

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object Fonts { val roboto: FontFamily @Composable get() = ... } SOURCE SET commonMain

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object Fonts { val roboto: FontFamily @Composable get() = ... } object Typographies { val roboto: Typography @Composable get() = Typography(defaultFontFamily = Fonts.roboto) } SOURCE SET commonMain

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object Fonts { val roboto: FontFamily @Composable get() = ... } object Typographies { val roboto: Typography @Composable get() = Typography(defaultFontFamily = Fonts.roboto) } @Composable fun ExploringMoviesTheme( isDarkMode: Boolean = isSystemInDarkTheme(), content: @Composable () -> Unit ) { MaterialTheme( colors = if (isDarkMode) DarkColorPalette else LightColorPalette, typography = Typographies.roboto, shapes = shapes, content = content ) } SOURCE SET commonMain

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:android-app :desktop-app :data :components :theming

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@Composable expect fun RemoteImage( url: String, contentDescription: String?, modifier: Modifier = Modifier, contentScale: ContentScale = ContentScale.Fit ) SOURCE SET commonMain

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import org.jetbrains.compose.compose plugins { ... } android { ... } kotlin { android() jvm("desktop") sourceSets { named("commonMain") { ... } named("androidMain") { dependencies { implementation(Dependencies.Accompanist.coil) } } } }

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@Composable actual fun CrossRemoteImage( url: String, contentDescription: String?, modifier: Modifier, contentScale: ContentScale ) { Image( painter = rememberAsyncImagePainter(model = url), modifier = modifier, contentDescription = contentDescription, contentScale = ContentScale.Crop, ) } SOURCE SET androidMain

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import org.jetbrains.compose.compose plugins { ... } android { ... } kotlin { android() jvm("desktop") sourceSets { named("commonMain") { ... } named("androidMain") { ... } named("desktopMain") { dependencies { implementation(Dependencies.okhttp) } } } }

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@Composable actual fun CrossRemoteImage( url: String, contentDescription: String?, modifier: Modifier, contentScale: ContentScale ) { val image = remember { mutableStateOf(null) } if (image.value != null) { Image( bitmap = image.value!!, contentDescription = contentDescription, modifier = modifier, contentScale = contentScale ) } } SOURCE SET desktopMain

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@Composable actual fun CrossRemoteImage( url: String, contentDescription: String?, modifier: Modifier, contentScale: ContentScale ) { val image = remember { mutableStateOf(null) } LaunchedEffect(url) { } if (image.value != null) { Image( bitmap = image.value!!, contentDescription = contentDescription, modifier = modifier, contentScale = contentScale ) } } SOURCE SET desktopMain

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@Composable actual fun CrossRemoteImage( url: String, contentDescription: String?, modifier: Modifier, contentScale: ContentScale ) { val image = remember { mutableStateOf(null) } LaunchedEffect(url) { ImageLoader.load(url)?.let { } } if (image.value != null) { Image( bitmap = image.value!!, contentDescription = contentDescription, modifier = modifier, contentScale = contentScale ) } } SOURCE SET desktopMain

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@Composable actual fun CrossRemoteImage( url: String, contentDescription: String?, modifier: Modifier, contentScale: ContentScale ) { val image = remember { mutableStateOf(null) } LaunchedEffect(url) { ImageLoader.load(url)?.let { image.value = org.jetbrains.skia.Image.makeFromEncoded(it) .toComposeImageBitmap() } } if (image.value != null) { Image( bitmap = image.value!!, contentDescription = contentDescription, modifier = modifier, contentScale = contentScale ) } } SOURCE SET desktopMain

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WHY SHOULD CARE ABOUT COMPOSE?

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WHY SHOULD CARE ABOUT COMPOSE? ▸ Android UI framework never changed since 2008 ▸ Need to wait very long time before bug fixes deployed in production ▸ Need to worry about keeping the View hierarchy as flat as possible ▸ Unbundled from OS ▸ Exit View and Fragment ▸ Clarify state ownership and event handling ▸ Writing less code

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slack.kotlinlang.org #compose Open Source Project github.com/androidx/androidx

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REFERENCES ▸ Discovering Movies, GitHub Repository of Gerard Paligot https://github.com/GerardPaligot/discovering-movies ▸ Official documentation about Jetpack Compose, Developer Android Website https://developer.android.com/jetpack/compose/documentation ▸ Pathways Compose https://developer.android.com/courses/pathways/compose ▸ Compose Academy https://compose.academy/ ▸ Samples Compose app by community https://jetpackcompose.app/

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THANK YOU! @GerardPaligot