kotlinlang #compose

if i observe a state data class in compose, and inside i have a snapshotlist. To recompose on list changes i just need to change the list, regardless of emitting or not a new state. Is this right ?

Luis Daivid

01/08/2022, 2:08 PM

I’m making an app using bottomNavigation. However, whenever I touch the bottom tab, it is recomposed and the screen is updated. When I searched the navigation document, it came out like the one below,

By using the saveState and restoreState flags, the state and back stack of that item is correctly saved and restored as you swap between bottom navigation items.

and of course it is recomposed every time even though it is applied. What should I do?

Javier

01/08/2022, 2:09 PM

Is there an

OnPointerEvent

common API for Desktop and Android?

Solomon Tolu Samuel

01/08/2022, 10:58 PM

Hello, I was wondering if the is any example out there on how to implement location updates(with foreground service) in compose?

David W

01/09/2022, 6:16 AM

Any suggestions on how to add a full-width horizontal divider to a

LazyVerticalGrid

with adaptive cells? I searched here and google, but there weren't any solutions. edit: all set, came up with a different solution.

David W

01/09/2022, 8:15 AM

Is there a way to either change the center of a component or center a specific item in a row, with other items to either side of it? I'd like to make a specific word be the center of a Text, essentially.

Stylianos Gakis

01/09/2022, 4:34 PM

I got a local object that I am creating in compose which requires cleanup when it is destroyed. Currently I am doing:

val lifecycleOwner = LocalLifecycleOwner.current
var audioPlayer: AudioPlayer? by remember {
    mutableStateOf(null)
}
DisposableEffect(audioUrl, lifecycleOwner) {
    val localAudioPlayer = AudioPlayer(audioUrl, lifecycleOwner)
    audioPlayer = localAudioPlayer
    onDispose {
        localAudioPlayer.cleanup()
    }
}

So using DisposableEffect to make sure to cleanup the AudioPlayer in case any of the keys change and I create a new instance of AudioPlayer so I cleanup the old one, or if it leaves the composition. This feels a bit hacky however, especially with the initial null state above it, making the code below this awkward too. Is there some better approach I could possibly look into instead?

Rob

01/09/2022, 5:26 PM

I am trying to make a collapsing toolbar with Material3. I want the AppBar to layout under the statusbar so that when it collapses the content will scroll under the statusbar. I've added padding to the AppBar but when it is collapsed it doesn't collapse the padding. Is there a way to collapse the padding on the AppBar as well? Thanks!

Untitled.kt

dewildte

01/09/2022, 7:02 PM

Does anybody know if Rive is going to integrate with Compose the same way they did with Flutter?

Ayfri

01/09/2022, 10:57 PM

Hey, is it possible to have a TextField required to be filled ?

David W

01/10/2022, 4:50 AM

Here's a very weird bug. Having the below code in a Card that has a Border (a normal, solid, 1dp non-conditional border) causes the Card's Border to use a horizontal gradient color (and a radial if i change the below to use radial). The super bizarre thing is that it swaps between using the gradient and showing the expected solid line when I move my mouse around, like a flicker, without any modifiers set up that do things based on mouse movement.

Box(
                    modifier = Modifier
                        .background(
                            brush = Brush.horizontalGradient(
                                colors = listOf(
                                    MaterialTheme.colors.primary.lighten(50).copy(alpha = 0.35f),
                                    Color.Transparent
                                ),
                            )
                        )
                        .size(32.dp)
                )
                {}

Slackbot

01/10/2022, 10:57 AM

This message was deleted.

dimsuz

01/10/2022, 2:30 PM

Ok, it looks like

LocalWindowInsets.current.ime.bottom

does not update after keyboard is hidden. it continues to report padding as though keyboard is visible 🤔

Samir Basnet

01/10/2022, 2:34 PM

In BottomSheetScaffold i have set sheetGesturesEnabled to false yet i can drag and close the bottom sheet . Anything i am missing??

Michael Langford

01/10/2022, 5:32 PM

I have a list of Packages. When a user taps one, they can edit it. We do this in a dialog. I'm having a bit of an issue handling the indirection. How do I pass the correct package to the viewModel that's associated with what's on the dialog when showing it? The naive way to do so seems like it would literally create a dialog per list item. Creating a view model and creating one dialog, does not seem to later let me change fields on the view model to specify the user selection.

Colton Idle

01/10/2022, 9:36 PM

I'm trying to create a non-lazy carousel. i.e. Scrollable Row with each item being about 90% of the full screen width. I have a small sample showing that I'm failing. Anyone that can spot my issue?

Billy Newman

01/10/2022, 10:46 PM

Should a ComposeView inside bottom sheet (behavior) handle scroll events correctly? As an example from the compose documentation:

Simple nested scrolling requires no action on your part. Gestures that initiate a scrolling action are propagated from children to parents automatically, such that when the child can't scroll any further, the gesture is handled by its parent element.

When I scroll up in the bottom sheet, the bottom sheet first resizes to fill the screen then properly scrolls to the bottom of the content, which is the expected behavior. However, when trying to scroll back to the top of the content (ie dragging down), the bottom sheet starts to collapse instead of scrolling the content down first.

eygraber

01/10/2022, 10:58 PM

I'm getting the following error when showing a preview in AS 7.2 alpha 🧵

Rick Regan

01/11/2022, 12:46 AM

I was looking to use mutable state to declare a variable without initializing it and with the benefit of delegate syntax. If I do

lateinit var myState: MutableState<MyState>

then I have to reference with

myState.value.myProperty

. If I do

var myState: MyState? by mutableStateOf(null)

then I have to reference with

myState?.myProperty

(or other ways of dealing with nullable types). Is there a form that lets you use

myState.myProperty

with

lateinit

Afzal Najam

01/11/2022, 1:24 AM

I can’t find an assertion for background color (or any colors) in Compose UI test functions nor in any documentation so far. Is there a way to check whether an element has an expected background color?

eygraber

01/11/2022, 1:56 AM

Is there anything like

expandedHintEnabled=false

from

TextInputLayout

for a

TextField

linus muema

01/11/2022, 4:55 AM

I had recently discovered a default shimmer effect on Jetpack compose for loading layouts but I can't seem to find the docs. Does anyone know where I can find it or a similar implementation? 🤔

eygraber

01/11/2022, 5:00 AM

Is there any issue with passing a

java.time.LocalDate

to a composable function, or should it be wrapped in something marked as

@Immutable

➕ 1

Scott Kruse

01/11/2022, 5:03 AM

How do you know if a screen was resumed in a pure compose app?

Samir Basnet

01/11/2022, 6:04 AM

I am starting to doubt whether Jetpack Compose is a step forward or backwards. It is really starting to get on my nerves , i was excited as building the UI is handsdown simple and quick but man the navigation is a mess specially with the bottomsheet. I mean now i have to worry about back handling too.

K Merle

01/11/2022, 6:46 AM

Is it possible to resize image (make it bigger) with modifier, but for an image to keep the same ratio?

Deepak Gahlot

01/11/2022, 7:35 AM

Hello All,

:this-is-fine: 1

:thread-please: 1

myanmarking

01/11/2022, 10:28 AM

how can we sort a SnapshotList. is it better just to create a new list i supposed. notification spam ?

Damian Kwaśniak

01/11/2022, 11:18 AM

Hi, I have a RecyclerView where my ViewHolder has XML view inside. One of its children is ComposeView. Following the documentation of Interoperability APIs, I set view composition strategy like this:

setViewCompositionStrategy(DisposeOnViewTreeLifecycleDestroyed)

It works fine as long as I am not updating the view when it is still attached to the window. If so, I get an exception added in thread. 1. User enters the RecyclerView where each item has show more button 2. User press show more button what causes the view to redraw (bind method from ViewHolder is called) 3. crash Any ideas?

:thread-please: 1

😬 1

Title

Damian Kwaśniak

01/11/2022, 11:18 AM

Hi, I have a RecyclerView where my ViewHolder has XML view inside. One of its children is ComposeView. Following the documentation of Interoperability APIs, I set view composition strategy like this:

setViewCompositionStrategy(DisposeOnViewTreeLifecycleDestroyed)

:thread-please: 1

😬 1

java.lang.IllegalStateException: View tree for androidx.compose.ui.platform.ComposeView{f43c13c G.E...... ......ID 58,413-912,470 #7f090115 app:id/contactOpportunityItemRelatedContactsComposeView} has no ViewTreeLifecycleOwner
        at androidx.compose.ui.platform.ViewCompositionStrategy$DisposeOnViewTreeLifecycleDestroyed.installFor(ViewCompositionStrategy.android.kt:109)
        at androidx.compose.ui.platform.AbstractComposeView.setViewCompositionStrategy(ComposeView.android.kt:136)
        at com.siemens.presentation.contactdetails.viewholder.opportunity.OpportunityViewHolder.bind(OpportunityViewHolder.kt:78)
        at com.siemens.presentation.contactdetails.viewholder.opportunity.OpportunityViewHolder.bind(OpportunityViewHolder.kt:49)
        at com.siemens.presentation.accountdetails.AccountDetailsAdapter.onBindViewHolder(AccountDetailsAdapter.kt:136)
        at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7337)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6194)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6460)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6300)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6296)
        at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2330)
        at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1631)
        at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1591)
        at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:668)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4309)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:4012)
        at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4578)

Arjun Achatz

01/11/2022, 12:52 PM

Try ViewCompositionStrategy.DisposeOnLifecycleDestroyed

I remember something about the docs not being exactly right about this one

Damian Kwaśniak

01/11/2022, 2:00 PM

What I did is:

binding.lifecycleOwner?.let {
                val strategy = ViewCompositionStrategy.DisposeOnLifecycleDestroyed(it)
                setViewCompositionStrategy(strategy)
            }

and in the init block of my ViewHolder I have to set binding's lifecycleOwner manually with:

init {
        binding.lifecycleOwner = parent.findViewTreeLifecycleOwner()
    }

but I am not sure if this solution is an equivalent of whet they suggest in the documentation

according to the documentation these two strategies work differently

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