Hello! The latest Jetpack Compose minor release, alpha04, is finally here! You can get it now on Google’s Maven Repository.  Release notes are available at https://developer.android.com/jetpack/androidx/versions/all-channel. Two important things to be aware of:  • androidx.compose:compose-compiler has been refactored to androidx.compose.compiler:compiler • Compose Version 1.0.0-alpha04 is only compatible with Android Studio 4.2 Canary 13 and later.

What happened to Modifier.weight in alpha04

Can't seem to figure out why gradle is searching for

compose-compiler

event though I declared

androidx.compose.compiler:compiler

as dependency.

Hi All, Is it possible to add a header item into a LazyColumnFor. So it appears once at the top of the List , but also scrolls with the list.

Does compose Alpha 04 work with kotlin 1.4.20? (Before you say "Just try it" I'm trying to migrate an existing project where 1.4.20 solves other issues like kotlinx.synthetics, plus some other kotlin bugs I had, and so it's hard for me to tell who the culprit is which is why I'm just posing the question 😄) EDIT: Aha! I think I have my answer. Even though the newest AS canary mentions

kotlinCompilerVersion '1.4.10'

it also mentions

ext.kotlin_version = "1.4.20-M1"

Hi, LazyColumn in alpha4 works great, should we use LazyColumn or LazyColumnFor and what is the difference ? Another question, how to control scroll offset index using LazyColumn/LazyColumnFor, thanks

Has anyone run into this when trying to migrate an existing app to compose? Getting this as a build failure. (full stacktrace in thread)

e: java.lang.NoSuchMethodError: org.jetbrains.kotlin.descriptors.ClassConstructorDescriptor.getVisibility()Lorg/jetbrains/kotlin/descriptors/DescriptorVisibility;
	at org.jetbrains.kotlin.kapt3.stubs.ClassFileToSourceStubConverter.convertMethod(ClassFileToSourceStubConverter.kt:840)
	at org.jetbrains.kotlin.kapt3.stubs.ClassFileToSourceStubConverter.convertClass(ClassFileToSourceStubConverter.kt:395)
	at org.jetbrains.kotlin.kapt3.stubs.ClassFileToSourceStubConverter.convertTopLevelClass(ClassFileToSourceStubConverter.kt:186)
	at org.jetbrains.kotlin.kapt3.stubs.ClassFileToSourceStubConverter.convert(ClassFileToSourceStubConverter.kt:131)
	at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.generateKotlinSourceStubs(Kapt3Extension.kt:295)
	at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.analysisCompleted(Kapt3Extension.kt:170)
	at org.jetbrains.kotlin.kapt3.ClasspathBasedKapt3Extension.analysisCompleted(Kapt3Extension.kt:100)
	...

I think LazyColumn and LazyColumnFor still have bug in the LazyListState scroll position, my scenario : I have list of items (100 items), when I scroll down to say item no 30, then I filter the list, so it only has 10 items, it will crashed java.lang.IllegalStateException: entered drag with non-zero pending scroll: -1403.0696 at androidx.compose.foundation.lazy.LazyListState.onScroll$foundation_release(LazyListState.kt:171) at androidx.compose.foundation.lazy.LazyListState$scrollableController$1.invoke(LazyListState.kt:144) On comparison, when I use ScrollableColumn, it works perfectly

Great to see

alpha04

release, does anyone know if Navigation was merged yet?

This one is not exactly related to Compose, however, I'm having issues with the latest AS canary + collections. Canary 13 + Kotlin 1.4.0 = I can use the standard Kotlin

emptyList()

Canary 13 + Kotlin 1.4.10 = forces me to import

java.util.Collections.emptyList

, does not allow me to reference the standard one. (sorry, I do not know if this was happening in previous canary versions. I have just updated to Kotlin 1.4.10 to test alpha04) P.S.: I tested Kotlin 1.4.10 in stable AS and in IDEA, no issues there.

How can we make animations in lazycolumn or lazyrow using compose ? Is there anything like itemAnimator used in recycler view

Is it possible to resize the width of sidebar menu from scaffold? I tried it on tablet landscape and it occupied 80% of the tablet width which is correct for phone but not correct for tablet

The critical code seems to be

Tab(
        text = { Text(homeScreenTab.title) },
        selected = currentTab == homeScreenTab,
        onClick = { currentTab = homeScreenTab }
)

When I click on the tab, the exception occurs (but only if the content of the tab contains a TextField)

I am facing a weird issue. Whenever I

cmd + click

on any standard

Composable

it takes me to the class file instead of the kt file. e.g. When I

cmd + click

on

Image

it takes me to

ImageKT.class

file instead of

Image.kt

file. Anyone can help me with this?

Hi guys, great to see alpha04 bringing performance optimizations to

LazyColumnFor

! I'm not sure if I'm doing something wrong, but I can't see any difference with the issue I filed sometime ago. I only had to change the version number for Kotlin and compose from alpha01 (last one I tested with) to 04. I also did Rebuild project a few times, not sure if this is enough for changes to take effect. Also, what I see is that on every scroll the compose function gets called for certain items (added a

Log.w

inside it to verify). On the other hand, everything is really smooth with

RecyclerView

and with a more complex view than the one in the sample project in the issue. I haven't changed anything to the code, apart from versions, in the sample project in the bug, probably I need to add something? Appologies if this is configuration issue! Thanks!

Are there any performance optimizations for

LazyColumn

in alpha04?

I have an issue with a project with the following setup • The app module and one dynamic feature, which both use Compose • Compose dependency is in app/build.gradle:

api "*compose dependencies"*

• r8 / minification is enabled Now assembleRelease won't work, it will fail at

> Task :app:minifyReleaseWithR8

with a java.lang.NullPointerException

Is anyone else having serious stability issues with Alpha04 and Android Studio 4.2 Canary 13. I have crashes happening all over the place now.

is

Box

and

Stack

deprecated now?

Seems to be down in the mutableState logic… Any ideas?

Is there any way to use

matchConstraint

in compose

ConstraintLayout

?

I want to go to a new screen with a left to right animation. Is there another way than using a pager? Dont want just crossfade, it has to go from left to right.

I am trying to go back to Alpha03 but get the following error with canary13:

Execution failed for task ':model:prepareDebugKotlinCompileTask'.

Could not resolve all files for configuration ‘:model:kotlin-extension’.

> Could not find androidx.compose.compiler:compiler:1.0.0-alpha03. Searched in the following locations: - https://dl.bintray.com/kotlin/kotlin-eap/androidx/compose/compiler/compiler/1.0.0-alpha03/compiler-1.0.0-alpha03.pom - https://repo.maven.apache.org/maven2/androidx/compose/compiler/compiler/1.0.0-alpha03/compiler-1.0.0-alpha03.pom - https://dl.google.com/dl/android/maven2/androidx/compose/compiler/compiler/1.0.0-alpha03/compiler-1.0.0-alpha03.pom - https://jcenter.bintray.com/androidx/compose/compiler/compiler/1.0.0-alpha03/compiler-1.0.0-alpha03.pom Required by: project :model

is it possible to move keyboard to the next

TextField

using

imeAction

?

This maybe a silly question, but I’m just starting with Compose. What material compose component can be used for a Label, a read-only TextField (no cursor, no focus, no keyboard pop-up)?

Updated to canary 13 with alpha04 and found that my imports for Modifiers need a package change from :

import androidx.compose.foundation.layout.RowScope.weight

to

import androidx.compose.foundation.layout.RowScope.Companion.weight

have anyone tried

OutlinedTextField

at the bottom of the screen? It doesn’t get up of the keyboard first time. And for the third time it does not response at all.