Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
선언형 UI에서의 상태관리
Search
HyunWoo Lee
December 21, 2024
Programming
0
540
선언형 UI에서의 상태관리
GDG Devfest Songdo 2024에서 진행한 선언형 UI에서의 상태관리의 Speaker Deck입니다.
HyunWoo Lee
December 21, 2024
Tweet
Share
More Decks by HyunWoo Lee
See All by HyunWoo Lee
How Android Uses Data Structures Behind The Scenes
l2hyunwoo
0
470
Understanding Kotlin Multiplatform (Busan)
l2hyunwoo
0
44
Understanding Kotlin Multiplatform
l2hyunwoo
0
290
파급효과: From AI to Android Development
l2hyunwoo
0
230
선언형 UI를 학습할 때 알아둬야하는 키워드들
l2hyunwoo
0
450
Essential concepts to know when learning Declarative UI
l2hyunwoo
2
1.4k
React Native under the hood
l2hyunwoo
0
130
유연한 Composable 설계
l2hyunwoo
0
700
KotlinConf 2024 Global in South Korea Keynote
l2hyunwoo
0
130
Other Decks in Programming
See All in Programming
デザイナーが Androidエンジニアに 挑戦してみた
874wokiite
0
500
Flutter with Dart MCP: All You Need - 박제창 2025 I/O Extended Busan
itsmedreamwalker
0
150
Navigation 2 を 3 に移行する(予定)ためにやったこと
yokomii
0
290
Android端末で実現するオンデバイスLLM 2025
masayukisuda
1
160
プロポーザル駆動学習 / Proposal-Driven Learning
mackey0225
2
1.3k
アルテニア コンサル/ITエンジニア向け 採用ピッチ資料
altenir
0
110
速いWebフレームワークを作る
yusukebe
5
1.7k
🔨 小さなビルドシステムを作る
momeemt
4
680
MCPでVibe Working。そして、結局はContext Eng(略)/ Working with Vibe on MCP And Context Eng
rkaga
5
2.3k
スケールする組織の実現に向けた インナーソース育成術 - ISGT2025
teamlab
PRO
1
110
モバイルアプリからWebへの横展開を加速した話_Claude_Code_実践術.pdf
kazuyasakamoto
0
330
CloudflareのChat Agent Starter Kitで簡単!AIチャットボット構築
syumai
2
500
Featured
See All Featured
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
162
15k
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.9k
Thoughts on Productivity
jonyablonski
70
4.8k
GraphQLとの向き合い方2022年版
quramy
49
14k
Side Projects
sachag
455
43k
Stop Working from a Prison Cell
hatefulcrawdad
271
21k
The Art of Programming - Codeland 2020
erikaheidi
56
13k
Bash Introduction
62gerente
615
210k
GitHub's CSS Performance
jonrohan
1032
460k
4 Signs Your Business is Dying
shpigford
184
22k
Fireside Chat
paigeccino
39
3.6k
Imperfection Machines: The Place of Print at Facebook
scottboms
268
13k
Transcript
Incheon ࢶഋ UIীࢲ ࢚కҙܻ - Circuitҗ Rinਸ बਵ۽ അ Android/React
Native Developer, Viva Republica(Toss) Organizer, Kotlin User Groups Seoul/GDG Incheon
࢚కҙܻ ѐ֛җ ࢎ ݾର ҙܻೡ “࢚క” ঌইࠁӝ ࢚క ઑӘ
؊ ੜ ҙܻ ೧ࠁӝ
Speakerdeck Youtube ࢶഋ UI ೨बѐ֛
࢚కҙܻ ѐ֛җ ࢎ
Before Compose class SampleActivity: AppCompatActivity() { private var name =
"" override fun onCreate(bundle: SavedInstanceState?) { super.onCreate(bundle) // ࢲߡాन APIService.getMyName().enqueue(object: Callback { override fun onResponse(ޤदӽ) { name = response.body().name updateUi() // binding.tv.text = name } }) } }
Before Compose • ѐߊо ߸ࣻܳ ߸҃ೞҊ UI ࢚కܳ ߸҃ೞب۾
٘ܳ ࢿ೧ঠೣ • ߸ࣻо ചݶ ߸҃ਸ दఃחؘ ਃبо ڄয • ചݶਸ ߸҃ೞח Ѫ ߸ࣻ ч ইצ ѐߊ
Before Compose - DataBinding class SampleActivity: AppCompatActivity() { private val
viewModel by viewModels() private lateinit var binding: ActivitySampleBinding override fun onCreate(bundle: SavedInstanceState?) { super.onCreate(bundle) binding = DataBindingUtil.setContentView(this, R.layout.ui) binding.viewModel = viewModel } } <layout> <data> <variable name=“vm” type=“com.sample.ViewModel” /> </data> <TextView <!— ࢤۚ —> android:text=“@{vm.user.nam e}” /> </layout>
Data Binding ߸ࣻܳ ߸҃݅ ೧ب ചݶ ࢚కо ߸҃ؽ ߸ࣻо ചݶ
“࢚క”о غب۾ ࢸ҅ ߑೱ ߸҃ , ചݶ ࢚క ߸҃ о ѐߊীࢲ दझమਵ۽ بؽ بੋ ࠽٘ఋ ࢚थҗ ೧ةೞӝ য۰ ী۞ झఖ ۨझ Data Binding -> View Bindingਵ۽ ֈযоח ୶ࣁ Ӓۢীب ࠛҳೞҊ ѐߊо ചݶ ߸ࣻо “࢚క”۽ ੋधೞѱ ػ ࣁ
Compose بੑ റ @Composable fun SampleText() { var text by
remember { mutableStateOf("") } LaunchedEffect(Unit) { text = APIService.getName().await() } TextField(value = text, onValueChange = { text = it }) }
Compose ߸ࣻܳ ߸҃݅ ೧ب ചݶ ࢚కо ߸҃ؽ ୶оੋ ࠽٘ కझ
হ ߸ࣻо ചݶ ࢚కо ؽ
Compose ߸ࣻо ചݶ ࢚క Android Developers - Ui State
࢚క ખ ؊ ࣁ ঌইࠁӝ
࢚కо ޤਃ? UIܳ അೞח ݽٚ ؘఠ
࢚కҙܻо ޤਃ? UIܳ അೞח ݽٚ ؘఠ ܳ ҙܻೞח ߑߨۿ
ࢤпࠁ ҙܻ೧ঠೡ ࢚క ઙܨח নೞ ഥਗоੑ ੑ۱ Form • ܴ/ݫੌ
ࣗ/࠺ߣഐ ١ ੑ۱ UI • ݫੌࣗ ࠂ ৈࠗ • ࠺ߣഐ Ѩૐ • ࠺ߣഐ ഛੋҗ ࠺ߣഐ ੌ ৈࠗ • ডҙ ز
ࢤпࠁ ҙܻ೧ঠೡ ࢚క ઙܨח নೞ
࢚కҙܻ Key Point ؘఠܳ য٣ী, যڌѱ ਤदఃחо?
࢚క৬ ࢚క
࢚క৬ ࢚క ࢚కо ־ҳীѱ ҕਬغҊ חо ೞա ஹನք && ध
ஹನքٜীѱ ҕਬ - ࢚క ஹನքٜ ࢎਊೡ ࣻ ѱ ҕਬ - ࢚క
࢚క(Global State) @Composable fun TodoTheme( darkTheme: Boolean = false,
content: @Composable () -> Unit ) { val colors = todoColors() val typography = TodoTypography() ProvideTodoColorAndTypography(colors, typography){ MaterialTheme(content = content) } }
উ٘۽٘ীࢲ ࢚కҙܻ
উ٘۽٘ীࢲ ࢚కҙܻ
Configuration Change CompositionLocal۽ ׳غח ч ী غפө Config Change۽ ч
ࠛউ೧ݶ ஹನքী ೱ -> জ উࢿ ೞ ۽ࣁझ ࢤݺӝী উਵ۽ ؘఠ द ਊ ޙઁ rememberSavableਸ ഝਊೞݶ 1MB ղ۽ ؘఠܳ ೧ঠೞחؘ ਗೞח ݅ఀ ؘఠܳ ਸ ೞо ࢚ ޅೠ Exception ఠ ࣻ উ٘۽٘ীࢲ ࢚కҙܻ
࢚కҙܻ Android OS: ॄب જؘ, ॄۄ
࢚క ੜ ҙܻೞӝ
ࠗ࠙ ࢚కҙܻ ViewModel ❤
݈ ViewModelী ֍חѱ ୭ࢶ? Configuration Changeী ٮۄࢲ ч ߸҃೧ঠೡ ࣻ
ѓ۟द Fold৬ э ҃ ਵݶ Phone UI, ಟݶ Tablet UI ࠁৈঠೞח ா झ ߊࢤ, ۠ ؘఠܳ Config Change উѱ فݶ য়۰ ী۞ ߊࢤ ܲ ஹನքٜী ࠛਃೠ ࠁܳ ֈѹ п ёח ೞѱ ҙ҅ػ ܲ ёٜী ೧ࢲ ઁೠػ ध݅ਸ оઉঠ ೠ. (Law of Demeter)
None
StateHolder Class @Stable class NiaAppState( val navController: NavHostController, coroutineScope: CoroutineScope,
networkMonitor: NetworkMonitor, userNewsResourceRepository: UserNewsResourceRepository, timeZoneMonitor: TimeZoneMonitor, ) { private val previousDestination = mutableStateOf<NavDestination?>(null) ……
StateHolder Class @Composable fun rememberNiaAppState( … ): NiaAppState { return
remember { NiaAppState( navController = navController, coroutineScope = coroutineScope, networkMonitor = networkMonitor, userNewsResourceRepository = userNewsResourceRepository, timeZoneMonitor = timeZoneMonitor, )
State Holder https://developer.android.com/topic/architecture/ui-layer/ stateholders
Circuit ନݡೞӝ
Circuit? Circuit is a simple, lightweight, and extensible framework for
building Kotlin applications that’s Compose from the ground up.
Circuit? Circuit рױೞҊ о߶ݴ ഛ оמೠ ۨਕ۽, A-Zө Compose݅ਸ ഝਊೞৈ
Kotlin গܻா࣌ਸ ҳ୷ೡ ࣻ णפ.
Circuit? ࢚కҙܻ ߑध݅ਸ ۽ ঠӝ ೞӝ ٸޙী ജ҃ࢸ ١ ҳഅী
ਃೠ ࣁࠗࢎ೦ٜ ઁ৻ೞणפ
Circuit?
Circuit?
Circuit рױೠ ҳઑب
Screen data class CounterScreen(val initialCount: Int): Screen data class DetailScreen(val
id: Long): Screen data class FavoriteScreen: Screen
CircuitUiState, CircuitUiEvent sealed inte rf ace State : CircuitUiState {
data object Loading : State data object NoFavorites : State data class Results( val list: List<Favorite>, val eventSink: (Event) -> Unit ) : State } sealed inte rf ace Event : CircuitUiEvent { data class ClickFavorite(id: Long): Event }
@Composable fun CounterPresenter(): CounterState { var count by rememberSaveable {
mutableStateOf(0) } return CounterState(count) { event -> when (event) { CounterEvent.Increment -> count++ CounterEvent.Decrement -> count-- } } } Presenter
@Composable fun CounterPresenter(): CounterState { var count by rememberRetained {
mutableStateOf(0) } return CounterState(count) { event -> when (event) { CounterEvent.Increment -> count++ CounterEvent.Decrement -> count-- } } } Presenter
rememberRetained
// CircuitUiState ఋੑ expo rt inte rf ace CounterState {
value: number } // CircuitUiState ୡӝ ё const initialState: CounterState = { value: 0, } Redux Toolkitҗ Presenter
// Circuit presenter expo rt const counterSlice = createSlice({ name:
'counter', // Updateغח state initialState, reducers: { // event ࠗ࠙ increment: (state) => { state.value += 1 }, decrement: (state) => { state.value -= 1 } } ) Redux Toolkitҗ Presenter
@CircuitInject(FavoriteScreen::class, ActivityRetainedComponent::class) @Composable fun FavoritesList(state: FavoritesScreen.State) { when (state) {
Loading -> Text(text = stringResource(R.string.loading_favorites)) NoFavorites -> Text( modi fi er = Modi fi er.testTag("no favorites"), text = stringResource(R.string.no_favorites) ) is Results -> { LazyColumn { items(state.list) { Favorite(it, state.eventSink) } } } } } Screen
Circuitী ೠ рۚೠ ࣗх • ഋ জҗ э ҃, ఋੑ/ҳഅী
ೠ ӏઁٜ ࢤೞח ٘ ాੌࢿҗ оةࢿਸ ֫ৈ ࣻ • Unit Testب рױೞѱ ࢿೡ ࣻ • Compose runtimeਸ ഝਊ೧ࢲ ߈ഋ ࢚కܳ ઁೡ ࣻ ח Ѫী
Circuitী ೠ рۚೠ ࣗх • Ѧ ਊೡ ࣻ ח ഥࢎо
ݻա ਸө? • নೠ بҳٜ(Flow, Rx, Legacy View ١)җ interopਸ ೡ ࣻ ݅, ܳ interopೞӝ ਤ೧ ٘ח ݆ࣻ ҕٜࣻਸ ࢤп೧ঠؽ • ъઁ۽ ҳഅ/ࢎਊ೧ঠೞח Ѫٜ(Presenter, Navigator ١) ݆ই पઁ۽ ۽؋࣌ী ਊؼ݅ೠח ޙ
@Composable fun ScreenA() { var isB by rememberRetained { mutableStateOf(true)
} rememberRetained{ "A" } if(isB) { rememberRetained{ "B" } } else { rememberRetained{ "C" } } } takahirom/Rin
উ٘۽٘ীࢲ ࢚కҙܻ ࢚క৬ ࢚క ࢚కܳ ࠁ ؊ ੜ ҙܻೠ ߑߨ
Summary
Thank you Incheon HyunWoo Lee Android(React Native) Developer, Viva Republica(Toss)