All Questions
Tagged with android-jetpack-compose viewmodel
137 questions
1
vote
2
answers
41
views
What's the difference between "viewModel: MyViewModel = viewModel()" and "viewModel: MyViewModel = MyViewModel()" in Android Composable
Here my composable
@Composable
fun CounterScreen(viewModel: MyViewModel = viewModel()) {
val uiState by viewModel.uiState.collectAsState()
Column(
modifier = Modifier.fillMaxSize(),
...
- 1,054
4
votes
1
answer
177
views
Why is initialValue needed in collectAsStateWithLifecycle for StateFlow?
I have a ViewModel that exposes a StateFlow representing the UI state of a book list:
class BooksViewModel(private val getBooksUseCase: GetBooksUseCase) : ViewModel() {
val booksState: Flow<...
- 7,495
0
votes
1
answer
50
views
TextField's onValueChange doesn't modify view model state
TextField always get empty when I try to write in it.
My ViewModel:
class MyVM: ViewModel() {
var name by mutableStateOf("")
fun onNameChange(newString: String) {
name = ...
1
vote
0
answers
101
views
Shared ViewModel with Type-Safe Navigation in a Multimodule Project
As the title suggests, I am trying to determine the best approach for implementing a shared ViewModel in a multimodule project.
Here is the approach I currently use:
In my app module, I have the ...
- 13
0
votes
0
answers
60
views
Create HiltViewModel with custom ViewModelStoreOwner
I have this compose code who works perfectly:
val pagerVM = hiltViewModel(
creationCallback = { factory: JourneySummaryPagerViewModel.Factory ->
factory.create(selectedIndex.value)
}...
- 17.8k
1
vote
2
answers
58
views
How do I handle a function that is calling a repository and also being used in two separate ViewModels
I have two ViewModels that contain the same function. The function calls an interface/repository to retrieve data from a database, and the function then manipulates the data.
It is my understanding ...
- 13
3
votes
1
answer
64
views
Hilt injection order inconsistency leading to NullPointerExceptions in Compose ViewModel
I'm currently working on an application using Compose and Hilt, and occasionally (less than 10 times out of 1000 according to my automated tests), the order of calls to my ViewModel differs, leading ...
- 1,897
0
votes
0
answers
57
views
NavigationViewModel gets unexpectedly cleared when a screen is popped from the back stack
Let's assume I have two screens:
Screen A
Screen B.
When I send a NavigationUiEvent.ShowScreenB to the NavigationModel, the NavigationModel emits that event into a SharedFlow.
That flow is ...
- 3,613
1
vote
1
answer
200
views
How to observe changes in a List when the ViewModel is in Java and the UI is in Jetpack Compose (Kotlin)
I am migrating an application from View to Compose. The application was written in Java so I need to migrate the UI to Kotlin.
I prefer to do it as gradually as possible so I'm leaving the ViewModel ...
- 469
0
votes
1
answer
95
views
How can I fix the issue of StateFlow values not updating?
How can I fix the issue of StateFlow values not updating?
The value of StateFlow is not assigned to the BoardRequestDto object.
The latest value of StateFlow is not properly collected in the ...
2
votes
1
answer
200
views
multiple instances with compose and kotlin
sorry for the English, I'm using a translator.i'm just a beginner, please consider this when replying.i know the code may not be the best. this is just a start.
I'm using the viewmodel to create a ...
- 23
1
vote
1
answer
82
views
How to get the same ViewModel instance in Composable and Activity?
In my android project (jetpack compose) I have activity where in the onTagDiscovered method, I receive a message read from an NFC tag, which I want to pass to the currently active viewModel, where I ...
- 143
0
votes
1
answer
31
views
How do I create an instance of a view model with input parameters
I have the following view model which is taking a Context input parameter.
class MyViewModel(val context: Context): ViewModel() {
}
When my app tries to create an instance of this view model, I get ...
- 619
1
vote
0
answers
48
views
How to Handle Nested Square Roots and Expressions in a Scientific Calculator App?
I'm developing an Android app called "Scientific Calculator" with Jetpack Compose, and I've successfully implemented the square root operation for simple cases like √4 and √4*2. However, I'm ...
-2
votes
1
answer
103
views
why am i getting error in for the viewModel() and am not able to import the dependency as it doesn't even exist in buil.gradle.kts file
It shows the issue
It shows the error that occurs
Guys Im getting this error while importing the viewModel,then when I checked in the build.gradle.kts file with the help of chat gpt , the dependency ...
