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Questions tagged [mutablestateof]

33 questions
8
votes
1 answer

Jetpack Compose TextField not updating when typing a new character

I followed this document from the developer site. I want to display the text in an OutlinedTextField from a user input, and have it survive configuration changes. With the code below, when the user inputs the text from the keyboard,…
Zappy.Mans
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3
votes
1 answer

How to use null as default value - Compose mutableState

I have a need like on first time on UI load the mutableStateOf Boolean value must be null , instead of default value as true/false similar to regular boolean value in Kotlin as var isBooleanValue: Boolean = null what I need is as below var…
arun
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2
votes
1 answer

Android Jetpack Compose rememberSystemUiController() doesn't observe mutableStateOf()

I'm trying to achieve a hide/show functionality for status bar in an AbstractComposeView class MyView @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0 ) : AbstractComposeView(context, attrs,…
Gonki
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2
votes
2 answers

mutableStateOf holding the value after the recomposition without remember API in Jetpack Compose

Any time a state is updated a recomposition takes place. but here, I haven't used the remember API, but after the recomposition also it's holding the value, is the mutableStateOf() will remember the value without remember API? @Composable fun…
FGH
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1
vote
1 answer

How SnapshotStateList detects that a change has occurred?

Suppose I have a SnapshotStateList for Student, and the definition of Student is: data class Student val students = mutableStateListOf(Student(0, "Aaron")) My Jetpack compose in wants to recompose when students…
progquester
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1
vote
0 answers

Checkbox in Jetpack compose not updating with the state value

I am creating a list of data to be multi selected and also want to add functionality by adding "Select All" option to select/deselect all the items at once. The issue I am facing is when checked the specific item, it is being checked/unchecked and…
Chintak Patel
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0 answers

Compose Android - Update a Item from list without page refresh

I have a LazyColumn list which holds user Items and I have populated the list Item view no issue on that, in here say I need to update a view from the Item like updating the user profile picture without updating the whole list but just making the…
arun
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1
vote
1 answer

Can I update a list in StateFlow (and change Compose View) without manually generating a new one just to modify one value in the list?

I have a lazyColumn of todo item data class TodoItem(val id: Int, val title: String, var urgent: Boolean = false) class AppViewModel : ViewModel() { private var todoList = mutableListOf( TodoItem(0, "My First Task"), …
Elye
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1
vote
2 answers

Boolean State in compose is changing before the variable I put after it get's assigned

So I have Two ViewModels in my Calculator App in which I all reference in my Compose NavGraph so I can use the same ViewModel instance. I set a Boolean State(historyCheck) in the first ViewModel and I set it too true to "Clear" the History I set…
Daniel Iroka
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1
vote
0 answers

Android, Jetpack Compose - Composable function not getting refreshed

I am new to Android Jetpack compose. All i want to do is to update data in UI when it gets from API. Here is my Composable function: @Composable fun getCurrentWeather(lat : Double, long : Double, nc : NavHostController, vm:…
kinza
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0
votes
1 answer

What is the syntax to make a callback function variable mutable in Jetpack Compose?

I'm trying to make the following variable, selectedView, mutable so that I can set the current Composable View dynamically. var selectedView :@Composable () -> Unit = { testView() } I'm passing back the Composable function and the following code…
J. Edgell
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0
votes
0 answers

assertHistorySize() for State or MutableState in Android Test

I am used to use awaitValue + assertHistorySize to test how much a LiveData has received and what it has got. So I write the following code (only as an example): val dataObserver =…
androoby
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0
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1 answer

Is passing mutablestate to composable function optimal?

Like this : @Composable fun TextEdit(textState: MutableState) { val text by textState TextField(onValueChange = { text = it }, value = text) } Is it optimal for unnecessary recompositions?
MH-Rouhani
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0
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2 answers

Updating item in a mutableStateList is not triggering recomposition in UI (LazyColumn)

I have been scratching my head over this problem. I have a data class representing items that can be selected(or unselected). data class FilterItem( val name: String, val isSelected: Boolean ) I have created a mutableStateList of…
Ayush Patel
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0
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0 answers

Question about atomized modifications to SnapshotStateList

I am using SnapshotStateList to maintain a list of Elements to feed the compose UI. When I add, remove, and replace elements to this list, they trigger my LazyColumn component to recompose. this all works fine. However, if during one of the…
progquester
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