@Cody Engel What about a ViewModel property that is of a type of a

@Model

class?

If I add this property I get an error:

Could not find method compose() for arguments [true] on BuildType container of type org.gradle.api.internal.FactoryNamedDomainObjectContainer.

org.gradle.api.artifacts.UnknownConfigurationException: Configuration with name 'kotlinPlugin' not found

With AGP 4.0.0-alpha01 and Kotlin gradle plugin 1.3.60-eap-25, what else do I need to add to gradle to enable this? (as shown in the compose tutorial: https://developer.android.com/jetpack/compose/setup#compose-compiler) PS: Also not working with Kotlin plugin version

1.3.60-eap-76

.

Caused by: java.lang.AssertionError: IR backend shouldn't call KotlinTypeMapper.mapType: AppMain

Well that's sad, just when I was trying to add Compose to an existing app to be the first to use it at production, I get this with 3 different versions of Kotlin, looks like Play Store will be compose free for some more time :troll:. PS: Fixed by commenting the following lines:

buildFeatures {
    compose = true
}

Is there something like dependency injection or BLOC or environmental object?

I’m on

Android Studio 4.0 Canary 1 Build #AI-192.6817.14.36.5959023, built on October 23, 2019

but I don’t see any import from sample option. I wanted to import

JetNews

and play around with it. Anybody else facing similar issue? Basically this first step:

If you're in the Welcome to Android Studio window, select Import an Android code sample. If you already have an Android Studio project open, select File > New > Import Sample from the menu bar.

There you go, even though it's just a stateless confirm dialog, it's made with Compose and it's shipped to Play Store 🙂, now we have Composables on production somewhere.

Another question 🙂 I see that

Layout

function calls

LayoutNode

with some paramerters and passes children. However I can’t seem to find

LayoutNode

function anywhere, and the class has no constructor, so where is it coming from? Does Compose plugin handle Node subclasses somehow and generate functions for them?

@Luca Nicoletti Haha, because we were too busy trying to finish up AS 4.0 and get it ready for you all, we didn't have time to install it in our own repository. 🙂. I have a CL to upgrade our repository, just need update the agp4 dependencies before landing it.

I've been trying to do something that I thought was going to be simple. I want to make a material card with a text inside it that fills the width of the screen. All I can do is making it look like it's wrapping content. Code is so far like this:

@Preview
@Composable
fun MainScreen() {
    MaterialTheme {
        Row(mainAxisSize = LayoutSize.Expand) {
            Greeting("Android")
        }
    }
}

@Composable
fun Greeting(name: String) {
    Card(shape = RoundedCornerShape(4.dp), elevation = 10.dp) {
        Text(text = "Yo $name!", style = +themeTextStyle { button })
    }
}

and my preview looks like:

Is there an ETA for not needing to add kotlin-reflection as dependency to use Compose? I want to use it on more "safe" (simple and stateless) places in production but don't want to increase the aab size by ~1mb.

Where are you seeing

kotlin-reflection

in the tutorial? Can I get a link?

can we decode Vector assets with

+imageResource(R.drawable.ic_face_primary_24dp)

? The method fails to generate the bitmap and throws

IllegalArgumentException("Problem decoding into existing bitmap")

I am not sure if I mess up or we can only decode Bitmaps atm

Do we have a

colorResource

for decoding color references?

in case of

Column { Text() }

the text is wrapped to the next line but with `Row { Column{ Text() } } a long text is cropped. Is there any way to limit the width of the Text to the size of its container?

No Compose version of BottomNavigationView?

How does Compose relate to current View system? I mean, Android UI Compose. Is there somewhere down the stack an actual Android View used? From the ADS talk I assume that for at least some of the components there is (for example WebView, MapView maybe TextView?). If so then where is this layer in the stack that was showed on ADS presentation? Are there Compose Components that are completely independent of current View system that are written completely from scratch using Compose? And last question is about @GenerateView annotation - what does it do? Does it translate Compose code into View code under the hood? Or maybe it generates an xml or something?

Hello, how can I create rectangle shape with

width=4dp

and

height=match_parent

in compose?

Hello guys, I wanted to try Compose in my current project, however when I try to build the project I get the following error java.lang.IllegalStateException: Backend Internal error: Exception during code generation Caused by: java.lang.AssertionError: IR backend shouldn’t call KotlinTypeMapper.mapType: EULAFragment (not using any Compose in that Fragment) Any idea why? (If I delete the class the same happens with the next one) If I create a new project it works flawlessly, same with the demo Project JetNews

It should be possible. You can use

@GenerateView

to consume Compose UI like normal views. But remember that Compose is not production ready yet.

I guess the oposite isn't possible either? (I need to include a logo inside my TopAppBar, but I use FitStart... A work-around for creating an image as title isn't difficult, but I don't know how to do FitStart...)

how do I change view? (in other words - navigate to other Composable) I tried to do the same thing as in Jetnews sample but it didn't work the only thing I did different is instead of

MaterialTheme
        ModalDrawerLayout(
            bodyContent = { AppContent { onDrawerStateChange(DrawerState.Opened) } }
        )
    }

i placed inside Material theme

AppContent()

directly

Hi, beginner question: What's the meaning of '+' in Jetpack Compose? For example in

+vectorResource(R.drawable.ic_face_primary_24dp)

. When it should be used and when not? Couldn't find it in the tutorial or ADS talks.

Hi everyone. I'm really exited about jetpack compose. I know this is just a dev preview but I built "Jetnews" sample application and there is some lags when screen changes, I guess there planned some performance improvements. Also, I wanted to is there any solution for navigation eg. handling backpress etc?

Hi guys, I run the Jetnews but I have a question, when a enter in a post, if I press the back button he closes the app. The back stack is not implemented yet for compose?

I don’t know if anyone pointed these small UI issues out, but scrolling doesnt slow down on a curve

and theres no overflow effect

I’m also impressed with how smooth this is for something that’s in alpha

Is recompose kinda like invalidate?