Any ideas how to get item coordinates on screen within Lazy column? 🤔 Wanted to implement something like shared element transition... Or maybe something already available there and me just missed?

How to achieve Spannable string multi-text color in Compose?

Is there any way to integrate jetpack navigation with navigation compose? Like adding navigation compose as nested navigation in parent navigation or vice versa

Is there any library for date/time picker now ? or how can we use Date Time Picker like a dialog fragment?

Hi, can anybody help me understand how does compose subscribe to state changes for knowing when to recompose ?

Hey, what’s the counterpart of

scrollToPosition(int position)

in Compose?

Has anyone used

Snackbar

? I found 2 methods on docs, 1 is taking

boolean state

and making it

visible/hide

on button click but here Snackbar doesn't get disappear after some interval (as we are controlling through state). 2 is when using

Scaffold

, it has

snackbarHost

where we customize our snackbar and display using a

Coroutine Scope

. So how can we make Snackbar hide after some time in 1 method? or should we use 2 method

Playing with recomposition to understand the optimistic scenario, I discovered that I can create a simple bouncing ball without any animation api. Just changing mutable state values. Is that a thing to avoid or is perfectly fine? About hardware resources can things like that consume a lot?

Hello, I have some difficulties understanding

by state

and

remember

differences. Could someone guide me towards some documentation about it?

Has compose gone through performance optimization yet? I found someone who made a small compose benchmark vs standard Android views a while back. His results shows compose running more than 50% slower than Android Views. I updated his benchmark to the latest version of compose, and ran it. I haven’t seen any numbers, but compose is noticeably slower from a user perspective of loading the page. https://github.com/MustafaBasim/uiPerformanceTests

Unfortunately the app doesn't restore the state after a configuration change for a bug in the navigation library. I filed an issue in the tracker https://issuetracker.google.com/issues/174158395

What’s the thinking behind making

RoundedCornerShape

take a percentage as an

Int

instead of a float between 0f-1f? I keep finding myself creating custom CornerSizes to work around this

I am starting to prototype a UI in Compose, and wonder if anybody has a sample or knows how to do something like so: something like a calendar, with a scrollable column of background cells (background), and with overlapping blocks of various sizes that scroll along with those cells. In SwiftUI I got it working with a scrollview inside a scrollview. Wonder if something similar is possible in Compose?? Thanks.

translate { scale { rotate { drawImage(...) } } }

in what order are these transformations applied to the drawn image?

Anyone know why I can’t clone the source on my Mac? Getting a 400 error when I try

repo init …

I did a quick search on bazel in this chat but nothing showed up, can anyone share their experience working with jetpack compose in bazel?

Can we mutate the items list being passed in to the

LazyColumnFor

? Like adding or removing items and expect the changes to be reflected in the

LazyColumn

? Something like

adapter.notifyDatasetChanged()

we used to do with

RecyclerView

I have been looking into SwiftUI lately, and fount this spacing property for rows and columns. I have been searching for it in Jetpack Compose but cannot find it? Is that correct? Do I have to add my own spacing between every item? for example

Spacer(modifier = Modifier.width(4.dp))

Sharing a slide I am preparing for my next talk, putting KMP and JetpackCompose and SwiftUI on a timeline

For new compose apps that don’t rely on fragments I think it makes sense to manually handle config changes. Then, since android ViewModels are designed just to survive config changes, they are not necessary (in those apps). The navigation component is deeply tied to viewModels and I think it should also offer the possibility of working with plain kotlin viewModels (view controllers). It would be more lightweight, not require factories, and make more sense in general, I think. What do you think?

As Android Studio 4.2-beta1 is out today, can we stay at 4.2 to use compose or is canary still recommended?

Hi @Ian Lake, Is it a bad idea to nest compose

NavGraph

?

NavHost(mainNavController, startDestination = STARTING) {
    composable(STARTING) {
        StartScreen(navController)
    }
    composable(NEXT) {
        Scaffold(
            topbar = { TopAppBar(...) }
        ) {
            val nestedNavController = ...
            NavHost(nestedNavController, startDestination = FLOW1) {
                composable(FLOW1) {
                    Flow1Screen(navController)
                }
                composable(FLOW2) {
                    Flow1Screen(navController)
                }
                ...
            }
        }
    }
}

hi, is there a way to bind the viewmodel's lifecycle to composables'?

Does Kotlin 1.4.20 support Compose in Android Studio Arctic Fox? Kotlin 1.4.10 works with Compose fine in it.

How to use flow with lazyColumn?

collectAsState()

or adding each element in a local

MutableSnapshotList

using something like

onEach

or

collect { }

Hello! The latest Jetpack Compose minor release, alpha08, is here! You can get it now from Google’s Maven Repository. Release notes are available at https://developer.android.com/jetpack/androidx/versions/all-channel. Please note that you will need to update your Kotlin compiler version to 1.4.20 for alpha08.

Are there “gotcha’s” around using

Flow

with Composables and

produceState

? For example, consider:

@Composable 
fun MyUi(viewModel: ViewModel) {
   val data by produceState(initialValue = "data", viewModel) {
        viewModel.getDataFlow().collect {
            value = it
        }
   }  
}

What if the

viewModel.getDataFlow()

method uses some flow operator(s)? For example:

fun getDataFlow(): Flow<String> {
    return myRoomDb.getData().distinctUntilChanged().map { convertEntityToString(it) }
}

I think I remember reading awhile back that this can be a problem, because every time there is a recomposition, the operators (in this case map) have to get re-wired up. Which (I think) I understand. So if so, what’s the solution?

Does Jetpack Compose work with Android Studio 4.2 beta or do we need to upgrade to the latest Canary ?

Does the KMM framework support jetpack?