Hey, I am curious if there's a way to subscribe to recompose of composition instance. Essentially something similar to

addChangesAppliedObserver

in composer on dev-14, but actually open for external listeners 🙂 The use case is that whenever changes are getting applied, they can result in multiple small updates. I wanted to batch them, so I could dispatch events more efficiently.

Hi, there is a way to get a

Size

passing through a

Modifier

?

@romainguy In your compose video, you made it sound like when alpha is released later this summer, that you encourage people using it in applications. Do you mean production applications, because it’s stable, and you are expecting that some APIs are missing, or there might be some slight changes, or do you mean only in non-production applications?

Hello everyone... has anyone faced this error >>>

java.lang.IllegalStateException: LayoutCoordinate operations are only valid when isAttached is true

?

Does anyone know if installation instructions are up-to-date? Like do I need Canary to use Compose etc etc.

Hi, how can I desugar the

Composable

function in AS? I would like to see what compose compiler does for those functions.

It seems that in a

Scaffold

, the content starts underneath the

topBar

but goes to the bottom of the viewport, even if there's a

bottomBar

there. I noticed this because the

VerticalScroller

I added wasn't scrolling due to the content only just going under the

bottomBar

. Is this the correct behaviour, and if so should I be storing the measured height of the bottom bar to fit the main content inside the

Scaffold

?

In Scaffold you can define a bottomBar with a cutout for the FAB. I would like to get the fabButtonBounds in the body to be able to archive something like in this screenshot. (I was already able to hack something together to get it working. But the code is very messy. Also the current cutout path calculation for rounded edges only works when the cutout is at the top)

Hey folks, I was playing with Compose over the weekend, and I tried working with the 

mutableStateOf()

 replacement suggestions for 

@Model

However, when I use a sealed class hierarchy to model my state, e.g like I've done here (https://github.com/segunfamisa/android-zeitung/pull/17/files#diff-03a45e46e60aaa4e3efa4e4e6041dea3R11-R23), I get an exception during IR lowering. The line that stood out for me was: 

Caused by: java.lang.AssertionError: Object should have a primary constructor: ...

I'm wondering if this is a technical limitation worth filing as a FR or bug, or something I totally not should be doing?

Asking as a total noob on Compose. Can I create a custom view wrapper around a compose function? In other words, can I inflate a custom view with a compose function instead of an XML file?

What is the difference between these two?

// 1st
(view as FrameLayout).setContent(Recomposer.current()) {

}

//2nd        
(view as FrameLayout).setViewContent {

}

Is there some sort of provider consumer pattern in compose? If not, how are we going to deal with the similar prop drilling issue that faced the react community? Because it is still obvious that state hoisting is the best approach. But again state hoisting is the mother of prop drilling or in this case, parameter drilling

I’m trying to wrap my head around this. I have an observable come back with the data to make a Profile page, however I have to make a second call to display more data to the user afterwards. How could I react when the second set of data comes back and add that to the tree? Example:

@Composable
Profile( username: String, name: String, location: String, activityTotals: List<ActivityTotals>? = null )

The

activityTotals

come back afterwards. Since

Profile

isn’t an object I can’t expose a property to update with the new value. Would I expose a state or pass in an observable or do something else?

I have a question about server-driven UI and Jetpack Compose. I've seen what some think are examples of server-driven UI with Compose, but really aren't (UI's not really configurable from the server, just data). So I was thinking, would it be possible to serialize Compose functions from the server, and deserialize them on an Android client? Kotlin closures are serializable, so that includes lambdas and functions. But the Compose compiler plugin needs to work its magic on that Composable function, which it can't do if it's deserializing it at runtime. Is the current way forward with server-driven UI with Compose to create a custom view engine, as current approaches use? Or is there a way to leverage Compose as the engine itself?

Hi, I recently upgrade my sample project from

dev-08

to

dev-14

(yea, a lot of changes x)) and see that you removed

@Model

annotation. According to your changelog, you suggest to use

state

or

remember

delegate functions but when I see your commit in your git repository with this breaking change, I found

@Stable

annotation with the exact same behavior as

@Model

. Someone can tell me what is this annotation?

New to compose (still reading). Is there a list of framework/androidx views that are supported/have an equivalent in compose? I see there’s constraintlayout and other viewgroups, but was curious about things like material chips, swiperefreshlayout, etc

Are deferred resources supposed to reload in the preview? I’m testing a basic drawable resource load: • Stack overflow indicates several implementations, and most of them seem to have changed (no DrawImage) • The easiest implementation

imageResource

is “likely to be removed” due to synchronous loading, and results in an AIOOB exception • The deferred loading pattern seems preferred, but does not seem to redraw once the icon loads. What is the correct approach here for loading resource content? Edit: I now realize there is a difference between

imageResource

and

vectorResource

, but the latter is also a transient API

Hi guys, I try to create test application and I need to implement pagination for LazyColumnItems. But I couldn't find how to get current visible item position to trigger loading of next page. Should I just get index of itemContent and compare it with items count?

Noticed that

compose-desktop

can correctly draw something now (not sure if this happend recently, before it is blank for me), I tried to compile compose runtime to iOS but had some issues with cocoutine kotlin-native abi version (

The abi versions don't match. Expected '[21]', found '22'

), after some struggling I give up because I am not actually very familar with MPP.

When will the

kotlin-multiplatfrom

support jetpack-compose compilation?

Hi, why do we choose

func

instead of

class

to create composable elements?

func

is lack of the capability of chain calls, for instance:

Text("...").font().textColor()

.

Hi all! I'm new to Android but have been developing iOS for a while. I'm looking to learn what I need to port a SwiftUI app to Android. Is it worth learning on compose? Can I even deploy an app to the Play Store with it? Or would I be better of sticking to the usual practices for now.

Hi, what do you think of having an interface like Resource Manager but for Compose functions? Because as I build more and more samples for fun. I found it's hard to find and navigate through UI components which are scattered over many files. The interface may have utilities like - A small preview, click to navigate to code etc.

Hi, I want to request permissions for my app. Can I use

registerForActivityResult

function in Compose? In this section of the android documentation it says that you must always call

registerForActivtyResult

in the same order in your Fragment/Activity. Can this be achieved in Compose?

I am rendering an animated gif, but it does not animate. Any ideas:

Image(
                        asset = imageFromResource(mResource!!, R.drawable.mutagent)
                    )

Hello everyone! I'm trying to use

compose

on a android module. But the project can't find

buildFeatures

🤔

A problem occurred evaluating project
> Could not find method buildFeatures() for arguments on extension 'android' of type com.android.build.gradle.LibraryExtension.

Why can't I call

remember

inside an inline function? 🤔

Hi, I'm encountering a bug which I suspect might be State not causing recomposition if updated the same frame it is created (eg https://kotlinlang.slack.com/archives/CJLTWPH7S/p1585902276072100). My use case is that I have a feed view and a detail view which both load images using Picasso. When entering the detail view, the image is already in the cache and loads instantly which seems to make the detail image stuck in the loading state. Placing a

delay(1)

seems to make it work as intended, but feels extremely hacky. What would be the idiomatic solution for this?

val imageState = stateFor<ImageState, String>(imageUrl) { ImageState.Loading }

launchInComposition(imageUrl) {
    delay(1)
    imageState.value = loadImage(imageUrl, targetWidthPx, targetHeightPx)
}

Hey guys, I have a question about how to obtain a

ViewModel

properly. dev14 added a

viewModel()

composable: Let’s say we need a

ViewModel

instance in multiple composable functions. Should we explicit obtain the instance via

viewModel()

in every composable function or should we obtain it once on top of the compose hierarchy and then pass it the way down?