kotlinlang #compose

🚀 Accompanist v0.4.0 has been released. The big feature is the new animated insets support (keyboard animations). ⌨️ https://github.com/chrisbanes/accompanist/releases/tag/v0.4.0

👏 7

🎉 25

Kshitij Patil

12/02/2020, 8:52 PM

Is it possible to use navigation-compose deeplink from a workmanager with pending intent attached to a notification to launch that specific composable in a defined state?

Robert Menke

12/02/2020, 9:24 PM

Is there an issue open for animation between views with navigation-compose?

Nate Ridderman

12/02/2020, 9:39 PM

Is there a way to query semantic properties for an element from a modifier on the element? I was hoping to use custom semantic properties as the basis for a style system.

jaqxues

12/02/2020, 9:49 PM

Running into this issue after updating to alpha08 https://youtrack.jetbrains.com/issue/KT-43635

Dominaezzz

12/02/2020, 11:31 PM

derivedStateOf

remember

. When should I prefer one over the other?

Nipun Rajput

12/03/2020, 10:30 AM

Hi All, Is there any way to display alert dialog on full width?

Rafs

12/03/2020, 10:32 AM

How do I center a view of variable width on the screen?

allan.conda

12/03/2020, 10:35 AM

We’ve been getting Modifier.clickable issues for a while now on a scrollable composable when going back from a navigation. We’ve just migrated to alpha08 and the issue is still not fixed. steps: 1. tap on a component with Modifier.clickable() (except a Button) that navigates to a different screen 2. go back and try to click the same component. The composable cannot be tapped. Can’t replicate this on a Button. The issue is fixed if you try to scroll-drag a little. It’s quite difficult to write a sample project and report a bug though. Anyone else encountering this issue and possibly may have filed a bug? I didn’t find any.

Vivek Sharma

12/03/2020, 11:02 AM

When using

scaffold

with

bottomBar

, and the

body

content , the

body

content goes below

bottomBar

, how can we avoid it? so that our content dont hide behind

bottomBar

Rafs

12/03/2020, 11:27 AM

What is the preferred way of loading an icon into a

FloatingActionButton

Irving

12/03/2020, 11:47 AM

I just migrated to alpha08 and then :

androidx.compose.ui.util.fastAny

and

androidx.compose.ui.util.fastForEach

can't resolve. The util lib need i resolve manually?

ds3fdfd3

12/03/2020, 11:52 AM

Now that navigation-compose library is out, I am trying an app without any fragments and only with compose screens. However, I am getting doubts on where do we create our ViewModels now. Some can be created in Activity scope but there are many optional screen where user may or may not go and it doesn't make sense to create their ViewModel beforehand.

allan.conda

12/03/2020, 12:05 PM

Has someone found yet where

createComposeRule

is in alpha08?

nrobi

12/03/2020, 12:42 PM

Suppose I want to call

@Composable registerForActivityResult()

from the callback of a

clickable()

. Are there any options/workarounds to call it directly from the callback?

Kshitij Patil

12/03/2020, 12:42 PM

How can I do

arrangement.End

and

spacedBy(x.dp)

for a row?

Maik

12/03/2020, 12:54 PM

Hello everyone, With the following code I want to draw a border on a box only at the top edge.

@Composable
fun Greeting() {

    Box(
            modifier = Modifier.height(250.dp)
    ) {

        Box(
                modifier = Modifier
                        .align(Alignment.TopCenter)
                        .size(100.dp)
                        .border(3.dp, Color.Cyan)
        )

        Box(
                modifier = Modifier
                        .align(Alignment.BottomCenter)
                        .size(100.dp)
                        .border(3.dp, Color.Cyan, GenericShape { size ->

                            moveTo(0f, 0f)
                            lineTo(size.width, 0f)
                        })
        )
    }
}

As you can see in the screenshot, the border is drawn, but it does not have the right width and also not the right color. Maybe someone can explain me where my mistake is or how I can draw a corresponding border at the top edge. I used the current version of Compose and Kotlin.

Rafs

12/03/2020, 1:10 PM

Is there anything like

Arrangement.SpaceEvenly

for

LazyRowFor

Mini

12/03/2020, 1:12 PM

Trying to add 1.0.8 to an existing project, kotlin 1.4.20

composeOptions {
    kotlinCompilerVersion '1.4.20'
    kotlinCompilerExtensionVersion '1.0.0-alpha08'
}
kotlinOptions {
    useIR = true
    jvmTarget = "1.8"
}

Everything works until I add buildFeatures { compose true } When compose is enabled the project never finishes building. I have multiple attempts, and my last one has been running for 3 hours 36 minutes 😕 Any ideas what might be wrong?

mattinger

12/03/2020, 2:02 PM

Anyone else having issues with compose in 4.2 beta 1? When i try it says it’s a preview feature and can’t be enabled.

mattinger

12/03/2020, 2:33 PM

java.lang.IncompatibleClassChangeError: Found interface org.jetbrains.kotlin.ir.declarations.IrClass, but class was expected
	at androidx.compose.compiler.plugins.kotlin.VersionChecker.check(VersionChecker.kt:65)
	at

Daniele B

12/03/2020, 2:33 PM

Only 2 families of DeclarativeUIs in the future?

💡 1

👍 7

Vivek Sharma

12/03/2020, 3:13 PM

I am navigating from 1 composable to another (kind of screens), so I passed

navController.popBackStack()

while navigating, and using this on pressing

backButton

in 2nd composable but when I am in 2nd compose and

rotate

screen , and then press

backButton

, it doesnt do anything Any idea why ? 🤔

zoha131

12/03/2020, 4:20 PM

is it possible to use

fillParentMaxWidth()

ScrollableRow

? or can I scroll programmatically in

LazyRow

Kshitij Patil

12/03/2020, 4:34 PM

@cb how can I make Glide/Coil image

fillMaxWidh()

? Seems like

preferredSize()

is a compulsory step to do.

Kirill Grouchnikov

12/03/2020, 11:08 PM

Is there something in core Compose or maybe the material layer that "propagates" the enabled state to the content / children composables? Specifically, I'm looking at the

Button

composable that uses

enabled

to configure the surface and content color. Is

AmbientContentColor

then used at the icon level to tint the child icon in the disabled state? What if the icon is not created from one of the material icons, but rather a "simple" bitmap? What would be the recommended way to propagate the disabled state to it so that it can draw itself at, say, 50% alpha?

Timo Drick

12/04/2020, 12:05 AM

Does anyone know what is the state of compose support for system windowinsets? Which tell you the padding needed for navigation/status bar. Just bring my app to the current alpha08 and thought maybe i can get rid of my custom solution.

zoha131

12/04/2020, 1:04 AM

Anyone else facing long build time after upgrading to alpha-08 and Arctic Fox?

🇳🇴 1

Lilly

12/04/2020, 1:17 AM

Hi I have 3 questions regarding state. I have the following composable:

@Composable
fun BluetoothDeviceListAdapterComponent(
    items: List<BluetoothDeviceWrapper>,
    connectVM: ConnectViewModel,
    onConnected: () -> Unit
) {

    // initial state is a problem here
    val connectState: BluetoothConnectState by connectVM.state.collectAsState()

    onCommit(connectState) {
        Timber.w("connectState changed")
        when(connectState) {
            is BluetoothConnectState.Loading -> {
                Timber.w("Loading")
            }
            is BluetoothConnectState.Success -> {
                Timber.w("GoTo next screen.")
                onConnected()
            }
            is BluetoothConnectState.Failure -> {
                // how to call toast from here?
            }
        }
    }

state

is a

MutableStateFlow

and can be Loading, Success or Failure(val errorMessage). First problem is that

MutableStateFlow

needs an initial value which triggers

onCommit

on first start but it should only be triggered when viewModel changes its state explicitly. Second problem is when state is Success and next screen is started: When I get back to the screen,

onCommit

is trigged with value Success and starts the next screen again, although the state hasn't changed. Last question would be how to call a Toast from

onCommit

? Is this approach even optimal for my use case?

zoha131

12/04/2020, 1:34 AM

I am getting an error while trying:

var expanded by remember { mutableStateOf(false) }

the error:

Type 'TypeVariable(T)' has no method 'getValue(Nothing?, KProperty<*>)' and thus it cannot serve as a delegate

Title

zoha131

12/04/2020, 1:34 AM

I am getting an error while trying:

var expanded by remember { mutableStateOf(false) }

the error:

Type 'TypeVariable(T)' has no method 'getValue(Nothing?, KProperty<*>)' and thus it cannot serve as a delegate

Lilly

12/04/2020, 1:35 AM

You have to import:

import androidx.compose.runtime.getValue
import androidx.compose.runtime.setValue

💯 1

zoha131

12/04/2020, 1:37 AM

thanks @Lilly

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