kotlinlang #compose

I'm using the androidx-paging compose library with a LazyColumn, but it keeps losing its scroll position when navigating away. I have the following code

val videos = viewModel.videos.collectAsLazyPagingItems()

LazyColumn(
    modifier = Modifier
        .fillMaxSize()
        .padding(horizontal = 14.dp),
    horizontalAlignment = Alignment.CenterHorizontally,
    verticalArrangement = Arrangement.spacedBy(10.dp)
) {
    items(
        items = videos,
        key = { it.id }
    ) { video ->
        if (video == null) return@items

        VideoCard(video)
    }
}

Thomas Dougherty

01/09/2023, 9:23 PM

https://issuetracker.google.com/issues/264352353

Thomas Dougherty

01/09/2023, 9:25 PM

^ I’m getting this issue where i get an IllegalArgumentException : Cannot round NaN value. It happens across devices/android versions/etc. I cannot replicate locally and the crash doesn’t indicate that it’s related to any of the components in my class. I’m using Inter-op with a fragment. The users that do seem to get this crash get it consistently, as in they crash, re-open, go through the flow, and crash again. Has anyone seen this issue, or have any ideas of what it could be?

zsperske

01/09/2023, 10:13 PM

I am trying to create a row with 2 pieces of text, where one is aligned to the start & the other to the end. Additionally I want each piece of text to have a minimum size of 100.dp. However when I try to do that, the first piece of text tramples over the other and ignores the minimum width. What am I doing wrong?

Row(modifier = Modifier.fillMaxWidth().padding(8.dp),
        verticalAlignment = CenterVertically,
        horizontalArrangement = Arrangement.SpaceBetween) {
        Text(modifier = Modifier.defaultMinSize(minWidth = 100.dp), text = "Some text that gets really long and keeps going and going", overflow = TextOverflow.Ellipsis, maxLines = 1)

        Text(modifier = Modifier.defaultMinSize(minWidth = 100.dp), text = "Other text that gets really long", overflow = TextOverflow.Ellipsis, maxLines = 1)
      }

ursus

01/09/2023, 10:16 PM

Why is

Surface

as a root composable in every example? Isn’t it supposed to be some sort of

Background

(which doesnt exist in material theme)? (also, why not expose the

BoxScope

in the content lambda? Now I need to add another needless

Box

if I need alignment)

01/10/2023, 12:15 AM

Are there plans to add params to Scaffold for passing in side composables such as the navigation rail or a drawer?

Lucas Kivi

01/10/2023, 12:38 AM

I have a button with conditional content:

CircularProgressIndicator

and

Text

. I want the button to stay the same size across content changes. This is easy enough if we just convert the text size in

Sp

Dp

and set the

CircularProgressIndicator

’s size padding accordingly. However, when we consider that the text may become multiple lines when font size is increased for accessibility this solution no longer works. I am considering building a

SubcomposeLayout

implementation that measures the

Text

and sets the button height accordingly and then can conditionally forego placing the

Text

. This seems a little computationally expensive. I don’t think

Intrinsics

will solve my problem. Does anyone have a suggestion for me before I build out my abstract

SubcomposeLayout

solution?

Justin Xu

01/10/2023, 1:22 AM

Hi all, very new to compose ui. I have a list of users displayed, with the option of expanding each user to display things like the user's nickname, status, etc. This data only needs to be updated from backend when it needs to be displayed on user click, so does it make the most sense to just call a suspending function every time it needs to be displayed, or use some sort of flow? Thanks

sen

01/10/2023, 3:18 AM

Is there a way to remove the context menu completely from TextFields?

sen

01/10/2023, 3:45 AM

When creating a

Popup

and attempting to resize the window, the

Popup

is not removed unlike other applications. This appears to be the default behavior? Is there any work around to hide the

Popup

when the user tries to resize the window, as it causes the

Popup

to be in the improper place (technically the "right" place, but it shouldn't be there).

Vrihas Pathak

01/10/2023, 10:25 AM

Hi all, does anyone has any idea what is the difference between "returning a modifier using

then()

" and "returning a modifier directly" while creating a custom modifier?

Hasan Nagizade

01/10/2023, 12:06 PM

how to popBackStack with popUpTo ?

Zaki Shaikh

01/10/2023, 2:11 PM

Hi everyone, I am working on an app using Jetpack Compose GoogleMap in which i am drawing polygon by user input it is working fine but has a performance issue it is leading to a UI Junk and can't render plolygon seamlessly by user touch input. Code in thread.

Omkar Amberkar

01/10/2023, 3:56 PM

I am playing around with surfaceview and compose and I often land into this issue where the surfaceview is disconnected from the surface randomly. Can someone look into this

java.lang.IllegalArgumentException: detached
    at MobilePlayerViewModel$createSurfaceViewOnAttachStateChangeListener$1.onViewDetachedFromWindow(MobilePlayerViewModel.kt:356)
    at android.view.View.dispatchDetachedFromWindow(View.java:21362)
    at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3949)
    at android.view.ViewGroup.removeAllViewsInLayout(ViewGroup.java:5785)
    at androidx.compose.ui.viewinterop.AndroidViewHolder.setView$ui_release(AndroidViewHolder.android.kt:95)
    at androidx.compose.ui.viewinterop.AndroidViewHolder$layoutNode$1$4.invoke(AndroidViewHolder.android.kt:310)
    at androidx.compose.ui.viewinterop.AndroidViewHolder$layoutNode$1$4.invoke(AndroidViewHolder.android.kt:307)
    at androidx.compose.ui.node.LayoutNode.detach$ui_release(LayoutNode.kt:420)
    at androidx.compose.ui.node.LayoutNode.detach$ui_release(LayoutNode.kt:432)
    at androidx.compose.ui.node.LayoutNode.detach$ui_release(LayoutNode.kt:432)
    at androidx.compose.ui.node.LayoutNode.detach$ui_release(LayoutNode.kt:432)
    at androidx.compose.ui.node.LayoutNode.detach$ui_release(LayoutNode.kt:432)
    at androidx.compose.ui.node.LayoutNode.onChildRemoved(LayoutNode.kt:314)
    at androidx.compose.ui.node.LayoutNode.removeAt$ui_release(LayoutNode.kt:288)
    at androidx.compose.ui.node.UiApplier.remove(UiApplier.android.kt:35)
    at androidx.compose.runtime.ComposerImpl$realizeMovement$1.invoke(Composer.kt:3835)
    at androidx.compose.runtime.ComposerImpl$realizeMovement$1.invoke(Composer.kt:3835)
    at androidx.compose.runtime.CompositionImpl.applyChangesInLocked(Composition.kt:808)
    at androidx.compose.runtime.CompositionImpl.applyChanges(Composition.kt:839)
    at androidx.compose.runtime.Recomposer.composeInitial$runtime_release(Recomposer.kt:995)
    at androidx.compose.runtime.CompositionImpl.setContent(Composition.kt:519)
    at androidx.compose.runtime.Recomposer$HotReloadable.clearContent(Recomposer.kt:385)
    at androidx.compose.runtime.Recomposer$RecomposerInfoImpl.saveStateAndDisposeForHotReload(Recomposer.kt:369)
    at androidx.compose.runtime.Recomposer$Companion.saveStateAndDisposeForHotReload$runtime_release(Recomposer.kt:1285)
    at androidx.compose.runtime.HotReloader$Companion.saveStateAndDispose(Composition.kt:1136)
    at dalvik.system.VMDebug.nativeAttachAgent(Native Method)
    at dalvik.system.VMDebug.attachAgent(VMDebug.java:656)
    at android.app.ActivityThread.attemptAttachAgent(ActivityThread.java:4220)
    at android.app.ActivityThread.handleAttachAgent(ActivityThread.java:4230)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2296)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loopOnce(Looper.java:201)
    at android.os.Looper.loop(Looper.java:288)
    at android.app.ActivityThread.main(ActivityThread.java:7898)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

ursus

01/10/2023, 4:09 PM

I’m debugging

collectAsState()

collectAsStateWithLifecycle()

on a viewmodel state in a app where screens are fragments. I found out, surprisingly, that they behave the same. If I push a new fragment, then the current fragment’s view gets destroyed, therefore compose “instance” there dies, and nothing is collected (observed), so no need for the
withLifecycle
Guess that is nice and ultimately expected. However, what I found as well, is that the state collection stops as well when app goes to background (still using

collectAsState, not the withLifecycle

How is this possible? Does compose have some implicit hooks into the

Activity

? Since in this case the fragment’s view does not get destroyed

Håkon Pettersen

01/10/2023, 6:35 PM

Does anyone here have any experience or good suggestions with using Compose navigation with Dagger2? So far I have followed this article, but what I am struggeling with is providing dependencies from our main module to the new module.

zsperske

01/10/2023, 9:19 PM

Does anyone have any experience/recommendations for how to implement something like the TouchDelegate you could implement in the view world? I have a material checkbox that I want to be able to align to the leading edge of (not the padding).

Modifier.minimumTouchTargetSize()

expands the actual size of the component

ursus

01/10/2023, 9:44 PM

How does compose know not to recompose on background? Does somehow automatically hook into

Activity

lifecycle?

Gonzalo Renedo

01/10/2023, 10:10 PM

how to change height in composable while scrolling other composable?

Carl Benson

01/11/2023, 8:14 AM

In an immersive app, with transparent system bars being visible with swipe from bottom, how do I keep them from appearing when I show a popup or a dialog? The UI looks jumpy and whenever a dialog/popup shows since it is resized in the background.

Moritz Post

01/11/2023, 11:25 AM

i have a best pracitice question: when having a state that could be null from eg when observing a viewMode, in a composable using the

by

delegate, how do you deal with the case that the value is null? An

if

check is an option but the value can not be smart-cast. What are you doing in that case? Example:

val user by viewModel.user.collectAsState(null)

if (user != null) {
  // user? can not be cast to user?
}

For one observable flow you could also

let

but that is very cumbersome when multiple values should be consumed. Any tips?

Guilherme Delgado

01/11/2023, 12:47 PM

Hi guys! I’ve a

LazyColumn

with

stickyHeader

and

itemsIndexed

. To build it I’m using

.forEach { (header, data) ->

. Let’s say I would have a “today” button, how can I scroll to a desired

stickyHeader

position making it the first item visible? As far as i know I don’t have access to

stickyHeader

indexes 🤔

Omkar Amberkar

01/11/2023, 2:01 PM

Is there a way to clear the hiltViewmodel manually? How does navController clear the viewmodel upon popup?

Tobias Preuss

01/11/2023, 3:20 PM

What is the Compose UI equivalent of

com.google.android.material.textfield.TextInputLayout

incl. hint outline, character limit text, error handling? Is there any recommendable open source library out there?

CLOVIS

01/11/2023, 3:21 PM

Applier

implementations need to be thread-safe? e.g. is it safe to create a

Node

implementation that uses an

ArrayList

to store its children?

Landry Norris

01/11/2023, 3:31 PM

ChatGPT uses an archive from 2021 for its training, and currently does not have access to the up-to-date web. I would be wary of anything it says about Compose.

Tolriq

01/11/2023, 7:08 PM

Where the new compose release docs released before the artifacts or is there a publish issue that will be fixed later?

Landry Norris

01/11/2023, 8:15 PM

I recently set up tests for a Compose app. The tests pass on my emulator and Pixel 5, but when I run on Firebase Test Labs, I get the following error. I don’t see any of my code in the stacktrace. Is there something I need to do differently for tests?

java.lang.IllegalStateException: calling recordModificationsOf and applyChanges concurrently is not supported

Title

Landry Norris

01/11/2023, 8:15 PM

java.lang.IllegalStateException: calling recordModificationsOf and applyChanges concurrently is not supported

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