Hi ! Maybe a dumb question, but does

mutableStateOf()

has an immutable version ? Or would that have no sense ? Because I want to have a state, but that would never change : just in order to avoid to create it each time

I have this mutable state with delegation

var engineName by rememberSaveable { mutableStateOf("") }

but sometimes, and initially, I want it to be null, how should I declare it ?

Where would you guys recommend starting to learn compose?

Hello Kotliners, Any example available on how to implement ” Tabs” / “TabRow” or sample. I would appreciate.

Seems like when using Android in LTR, Compose

Text

is not automatically align the text to the right when the text's language is RTL (Arabic for example), meanwhile the View base

TextView

does align the text to the right when the text's language is RTL, is it a bug or desired design?

Hi ! In my application I am using Navigation. But in one of my pushed pages, I mean in the composable which defines this page, I need to detect when application come back in the foreground, in order to update it. Let's call

MainActivity

the activity which defines the navigation, and

TargetComposable

the composable of the pushed page. How can I force a reload of

TargetComposable

when application is back in foreground ? Is using

MainActivity

's

onStart()

method mandatory (and can it lead to a kind a mess, coupled with Navigation) ? Or is there a simpler solution ?

Hello 👋 I have troubles to re-trigger an animation when a state changes. I want to make a label appear from left (outside the screen bounds) to center. I can make it work the first time but when I change the state linked to this label, the animation isn't re-triggered. (code in :thread-please:)

Hello, everyone! 👋 I’m facing some issues with

adjustResize

in my Compose project in landscape. The flag does work when the

TextField

is inside another smaller

Composable

, like a

BottomSheet

. If the the

EditText

is in a

Scaffold

, it does not seen to work. Could someone help me please? I attached a video to better explain it. Thanks a lot in advance!

I am trying to disable click ripple effect by

.clickable(indication = null)

even tho Android Studio autocompletes it, it becomes red instantly and wont build. Any ideas?

I am trying to use 

coroutines

 in a 

LazyVerticalGrid

 item. I have this:

val coroutineScope = rememberCoroutineScope()

and this in a `Column`:

val drawable = mutableStateOf<Drawable?>(null)
coroutineScope.launch {
    drawable.value = app.requireIcon(activity)
}

But the code inside

launch

does not even start. What am I doing wrong? I need to load a Drawable inside each lazy item and it can take a few seconds so I cannot do it on the main thread.

Hi, I am wondering if anyone has worked on such a problem. I have some code like this:

@Composable
fun WeightedBox() {
  Row {
    Box(modifier = Modifier.weight(0.3f)) {
      // Hypothetical @Composable Image
      Image(...)
    }
  }
}

Basically I am trying to load an image in a Box that will be weighted to 30% width of the display. The API I’m calling to fetch the image allows me to filter the url to only fetch the size of image I need. For example, if I’m fetching

/images/pic1.jpg

but I only need it at max 400px width/height, I could fetch

/images/pic1_400x400.jpg

. Is there any way for me to know the calculated width in pixels, so that I can pass this information along with my request? Fwiw I don’t need to use Box exactly. If there’s another composable that would provide this behaviour, I can use that. I guess my use case is similar to, say, if I were making a grid of images. Thanks for any help!

How can i call a @Composable function from reflection. I know that the compiler plugin will add two additional parameters to the function. The question is what should i provide in this first two parameters. One needs the Composer and the second an Int (I think it is the slot). Is it possible to do this via reflection?

The amount of special-casing that seems to be needed specifically to support ripples – someone at google must have very strong feelings about them 😂 Do any other compose operations happen on the render thread (e.g.

graphicsLayer

changes that don’t require recomposition perhaps)?

Hi!

onValueChangeFinished

for Slider doesn’t seem to be behaving I expect it to. I expect it to be called a single time once the user has finished dragging, but it is also called at the very beginning of a user drag. Is this the intended behavior?

Faced this error after upgrading to beta 04

java.lang.NoSuchFieldError: No static field Companion of type Landroidx/compose/foundation/layout/BoxScope$Companion; in class Landroidx/compose/foundation/layout/BoxScope; or its superclasses (declaration of 'androidx.compose.foundation.layout.BoxScope' appears in /data/app/com.view9.mahal-Zh5TQ66RD7sgpFKhGyXOyg==/base.apk)

at com.google.accompanist.pager.Pager.Pager(Pager.kt:461)

at com.google.accompanist.pager.Pager.HorizontalPager(Pager.kt:147)

Anyone know the equivalent of nested navigation arguments in Jetpack XML Navigation on compose-navigation?

<navigation>
  <navigation>
    <argument... />
    <fragment />
  </navigation>
</navigation>

I know that arguments inside

<fragment>

can be translated as

composable(
  route = "screenA",
  arguments = listOf(navArgument(...)),
) { ... }

But I’m not sure how we can pass arguments to a nested navigation itself which encapsulates its start destination.

Hello, I'm currently switching the main screen of my current project to Compose, and I'm looking for a way to do get the height from a composable to use it in another :

Box {
    Column(Modifier.padding(bottom = /* height of the snackbar*/)) {
        //content
    }
    Snackbar {
        Text("My text")
    }
}

what is the best method to do that? a custom layout ? Do you have any resources that could show me some code sample about this?

Hi, I’m looking at the compose testing part, and thinking is it possible to check if some local providers are set.

Using Compose Navigation library, I am trying to override

onBackPressed

to not let the user exit the app (its a launcher so that's the expected behavior). But I have not found a way to check if the current destination is the main/last destination or if back stack is empty so I dont call

super.onBackpressed

on that condition.

Has there been any discussion as to when Compose will be implementable outside of Canary AS?

Btw, is there anyone here that has or is planning to use Compose in a production app ? Sorry if it's something that has already been asked/asked regularly

I have a dumb question:

val tokens = viewModel.tokens.observeAsState(listOf())

I use mock viewModel for preview with hardcoded livedata

override val stables: LiveData<List<StableTokenWithMetaAndRate>> = liveData {
  listOf(StableTokenWithMetaAndRate.USDp, StableTokenWithMetaAndRate.EURp)
}

However in the preview show me an empty list (((

Hello! Is there any analog for SelectBox/DropdownMenu?

Hello all, I have 3 BottomNavigationTabs and each has its own "Container composable" that holds a navHost and controls its navigation within that tab. I am having trouble trying to retain the state of the current composable in view when I navigate to another tab and back. For instance I have tabs A,B,C. When navigating from A ->A1 -> A2 -> B and then back to A. It restarts from A when I would like it to resume from A2. Any information on how I can acheieve this?

How does one go about hijacking the back button the same way a DropdownMenu or AlertDialog does?

BackHandler

?

I have this scenario: Upon screen transition I want to animate an arbitrary amount of composables. I don’t want the other screen to show until all the composables have finished their exit animations. How would I go about knowing when the animations all complete? I am using

AnimatedVisibilty

for pretty much everything. But that composable does not have a callback, perhaps I could use a

LaunchedEffect

or

DisposableEffect

for that piece? I am not sure if this is an architectural question or a compose question. It’s kind of a cross cutting thing.

Hello, everyone! Does anyone know of a tool similar to Color Tool from material.io with Compose in mind? I tried using the aforementioned tool, but neither its output conform with Compose's theme structure nor was I able to infer the color names from their hex codes.

Why doesn't a disabled button have it's icon automatically tinted too? Code in 🧵