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Title: State in Jetpack Compose  |  Android Developers

Open Graph Title: State in Jetpack Compose  |  Android Developers

Description: In this codelab you’ll learn about how to build rich, interactive, Compose applications by managing state.

Open Graph Description: In this codelab you’ll learn about how to build rich, interactive, Compose applications by managing state.

Opengraph URL: https://developer.android.com/codelabs/jetpack-compose-state

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Links:

Skip to main content https://codelabs.developers.google.com/codelabs/jetpack-compose-state#main-content
https://codelabs.developers.google.com/
Android Studio https://developer.android.com/studio
https://codelabs.developers.google.com/
Android Studio https://codelabs.developers.google.com/studio
Statehttps://developer.android.com/jetpack/compose/state
Jetpack Compose tutorialhttps://developer.android.com/jetpack/compose/tutorial
ViewModelhttps://developer.android.com/topic/libraries/architecture/viewmodel
Latest Android Studiohttps://developer.android.com/studio
Thinking in Composehttps://developer.android.com/jetpack/compose/mental-model
Jetpack Compose basics codelabhttps://codelabs.developers.google.com/codelabs/jetpack-compose-basics/
Compose Setup documentationhttps://developer.android.com/jetpack/compose/setup
download the repository as a Zip filehttps://github.com/android/codelab-android-compose/archive/end.zip
BasicStateCodelabhttps://github.com/android/codelab-android-compose/tree/main/BasicStateCodelab
Roomhttps://developer.android.com/jetpack/androidx/releases/room
stringResourcehttps://developer.android.com/jetpack/compose/resources#strings
Texthttps://developer.android.com/reference/kotlin/androidx/compose/material/package-summary#Text(kotlin.String,androidx.compose.ui.Modifier,androidx.compose.ui.graphics.Color,androidx.compose.ui.unit.TextUnit,androidx.compose.ui.text.font.FontStyle,androidx.compose.ui.text.font.FontWeight,androidx.compose.ui.text.font.FontFamily,androidx.compose.ui.unit.TextUnit,androidx.compose.ui.text.style.TextDecoration,androidx.compose.ui.text.style.TextAlign,androidx.compose.ui.unit.TextUnit,androidx.compose.ui.text.style.TextOverflow,kotlin.Boolean,kotlin.Int,kotlin.Function1,androidx.compose.ui.text.TextStyle)
Modifierhttps://developer.android.com/reference/kotlin/androidx/compose/ui/Modifier
Buttonhttps://developer.android.com/reference/kotlin/androidx/compose/material3/package-summary#Button(kotlin.Function0,androidx.compose.ui.Modifier,kotlin.Boolean,androidx.compose.foundation.interaction.MutableInteractionSource,androidx.compose.material3.ButtonElevation,androidx.compose.ui.graphics.Shape,androidx.compose.foundation.BorderStroke,androidx.compose.material3.ButtonColors,androidx.compose.foundation.layout.PaddingValues,kotlin.Function1)
Columnhttps://developer.android.com/reference/kotlin/androidx/glance/layout/package-summary#column
lambda functionhttps://kotlinlang.org/docs/lambdas.html
Kotlin documentationhttps://kotlinlang.org/docs/reference/lambdas.html
Thinking in Composehttps://developer.android.com/jetpack/compose/mental-model
Statehttps://developer.android.com/reference/kotlin/androidx/compose/runtime/State
MutableStatehttps://developer.android.com/reference/kotlin/androidx/compose/runtime/MutableState
mutableStateOfhttps://developer.android.com/reference/kotlin/androidx/compose/runtime/package-summary#mutableStateOf(kotlin.Any,androidx.compose.runtime.SnapshotMutationPolicy)
rememberhttps://developer.android.com/reference/kotlin/androidx/compose/runtime/remember.composable#remember(kotlin.Function0)
Compose State documentationhttps://developer.android.com/jetpack/compose/state#state-in-composables
delegated propertieshttps://kotlinlang.org/docs/delegated-properties.html
LiveDatahttps://developer.android.com/topic/libraries/architecture/livedata
StateFlowhttps://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/-state-flow/
Flowhttps://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/-flow/index.html
Observablehttp://reactivex.io/documentation/observable.html
Compose and other librarieshttps://developer.android.com/jetpack/compose/libraries#streams
of composableshttps://developer.android.com/jetpack/compose/lifecycle#lifecycle-overview
Android Studio's Layout inspector toolhttps://developer.android.com/studio/debug/layout-inspector
rememberhttps://developer.android.com/reference/kotlin/androidx/compose/runtime/remember.composable#remember(kotlin.Function0)
Rowhttps://developer.android.com/reference/androidx/leanback/widget/Row
rememberSaveablehttps://developer.android.com/reference/kotlin/androidx/compose/runtime/saveable/rememberSaveable.composable#rememberSaveable(kotlin.Array,androidx.compose.runtime.saveable.Saver,kotlin.String,kotlin.Function0)
Bundlehttps://developer.android.com/reference/android/os/Bundle
Restoring state in Composehttps://developer.android.com/jetpack/compose/state#restore-ui-state
Compose Architecture documentationhttps://developer.android.com/jetpack/compose/architecture#udf-compose
Compose State documentationhttps://developer.android.com/jetpack/compose/state#state-hoisting
Checkboxhttps://developer.android.com/reference/kotlin/androidx/compose/material/Checkbox.composable#Checkbox(kotlin.Boolean,kotlin.Function1,androidx.compose.ui.Modifier,kotlin.Boolean,androidx.compose.foundation.interaction.MutableInteractionSource,androidx.compose.material.CheckboxColors)
data classhttps://kotlinlang.org/docs/data-classes.html
data layerhttps://developer.android.com/jetpack/guide/data-layer
LazyColumnhttps://developer.android.com/reference/kotlin/androidx/compose/foundation/lazy/package-summary#LazyColumn(androidx.compose.ui.Modifier,androidx.compose.foundation.lazy.LazyListState,androidx.compose.foundation.layout.PaddingValues,kotlin.Boolean,androidx.compose.foundation.layout.Arrangement.Vertical,androidx.compose.ui.Alignment.Horizontal,androidx.compose.foundation.gestures.FlingBehavior,kotlin.Boolean,kotlin.Function1)
Lists documentationhttps://developer.android.com/jetpack/compose/lists
Compose Tooling documentationhttps://developer.android.com/jetpack/compose/tooling#editor-actions
LazyColumnhttps://developer.android.com/reference/kotlin/androidx/compose/foundation/lazy/package-summary#LazyColumn(androidx.compose.ui.Modifier,androidx.compose.foundation.lazy.LazyListState,androidx.compose.foundation.layout.PaddingValues,kotlin.Boolean,androidx.compose.foundation.layout.Arrangement.Vertical,androidx.compose.ui.Alignment.Horizontal,androidx.compose.foundation.gestures.FlingBehavior,kotlin.Boolean,kotlin.Function1)
LazyListStatehttps://developer.android.com/reference/kotlin/androidx/compose/foundation/lazy/LazyListState
documentation for state in listshttps://developer.android.com/jetpack/compose/lists#react-to-scroll-position
BottomSheetScaffoldhttps://developer.android.com/reference/kotlin/androidx/compose/material3/BottomSheetScaffold.composable#BottomSheetScaffold(kotlin.Function1,androidx.compose.ui.Modifier,androidx.compose.material3.BottomSheetScaffoldState,androidx.compose.ui.unit.Dp,androidx.compose.ui.unit.Dp,androidx.compose.ui.graphics.Shape,androidx.compose.ui.graphics.Color,androidx.compose.ui.graphics.Color,androidx.compose.ui.unit.Dp,androidx.compose.ui.unit.Dp,kotlin.Function0,kotlin.Boolean,kotlin.Function0,kotlin.Function1,androidx.compose.ui.graphics.Color,androidx.compose.ui.graphics.Color,kotlin.Function1)
rememberBottomSheetScaffoldStatehttps://developer.android.com/reference/kotlin/androidx/compose/material3/rememberBottomSheetScaffoldState.composable#rememberBottomSheetScaffoldState(androidx.compose.material3.SheetState,androidx.compose.material3.SnackbarHostState)
toMutableStateList()https://developer.android.com/reference/kotlin/androidx/compose/runtime/package-summary#(kotlin.collections.Collection).toMutableStateList()
mutableStateListOfhttps://developer.android.com/reference/kotlin/androidx/compose/runtime/package-summary#mutableStateListOf()
SnapshotStateListhttps://developer.android.com/reference/kotlin/androidx/compose/runtime/snapshots/SnapshotStateList
item keys in a listhttps://developer.android.com/jetpack/compose/lists
custom saverhttps://developer.android.com/jetpack/compose/state#restore-ui-state
onSaveInstanceStatehttps://developer.android.com/reference/android/app/Activity#onSaveInstanceState(android.os.Bundle)
Save UI states documentationhttps://developer.android.com/topic/libraries/architecture/saving-states#onsaveinstancestate
options for preserving UI statehttps://developer.android.com/topic/libraries/architecture/saving-states#options
ViewModelshttps://developer.android.com/topic/libraries/architecture/viewmodel
Compose Navigationhttps://developer.android.com/jetpack/compose/navigation
UI layer documentationhttps://developer.android.com/jetpack/guide/ui-layer#define-ui-state
viewModel()https://developer.android.com/reference/kotlin/androidx/lifecycle/viewmodel/compose/viewModel.composable#viewModel(androidx.lifecycle.ViewModelStoreOwner,kotlin.String,androidx.lifecycle.ViewModelProvider.Factory,androidx.lifecycle.viewmodel.CreationExtras)
2.6.2https://developer.android.com/jetpack/androidx/releases/lifecycle#2.6.2
herehttps://developer.android.com/jetpack/androidx/releases/lifecycle
persisting your app's UI statehttps://developer.android.com/topic/libraries/architecture/saving-states
ViewModel and state holders sectionhttps://developer.android.com/jetpack/compose/state#viewmodels-source-of-truth
Compose and other librarieshttps://developer.android.com/jetpack/compose/libraries#viewmodel
Integrating Compose with your existing app architecturehttps://developer.android.com/jetpack/compose/interop/compose-in-existing-arch#viewmodel
Testing in Composehttps://developer.android.com/codelabs/jetpack-compose-testing#0
Compose pathwayhttps://developer.android.com/courses/pathways/compose
Sample appshttps://github.com/android/compose-samples/
JetNewshttps://github.com/android/compose-samples/tree/master/JetNews
Thinking in Composehttps://developer.android.com/jetpack/compose/mental-model
State and Jetpack Composehttps://developer.android.com/jetpack/compose/state
Unidirectional data flow in Jetpack Composehttps://developer.android.com/jetpack/compose/architecture#udf-compose
Restoring state in Composehttps://developer.android.com/jetpack/compose/state#restore-ui-state
ViewModel Overviewhttps://developer.android.com/topic/libraries/architecture/viewmodel
Compose and other librarieshttps://developer.android.com/jetpack/compose/libraries
rememberhttps://developer.android.com/reference/kotlin/androidx/compose/runtime/package-summary.html#remember(kotlin.Function0)
rememberSaveablehttps://developer.android.com/reference/kotlin/androidx/compose/runtime/saveable/rememberSaveable.composable#rememberSaveable(kotlin.Array,androidx.compose.runtime.saveable.Saver,kotlin.String,kotlin.Function0)
Statehttps://developer.android.com/reference/kotlin/androidx/compose/runtime/State
MutableStatehttps://developer.android.com/reference/kotlin/androidx/compose/runtime/MutableState
SnapshotStateListhttps://developer.android.com/reference/kotlin/androidx/compose/runtime/snapshots/SnapshotStateList
ViewModelhttps://developer.android.com/topic/libraries/architecture/viewmodel
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