Is there any known issues with running compose on a Samsung tablet? I’m noticing I get AARs every time I launch the application, but only on my Samsung tablet. Emulators and some other devices I have don’t have this issue.

Hey, I've found that there is pretty low fps scrolling in a ScrollableColumn inside a ConstraintLayout with height set to Dimension.fillToConstraints, that contains text. No lag:

setContent {
    ConstraintLayout(modifier = Modifier.fillMaxSize()) {
        val d = createRef()

        ScrollableColumn(modifier = Modifier.constrainAs(d) {
            top.linkTo(<http://parent.top|parent.top>, 30.dp)
            bottom.linkTo(parent.bottom, 30.dp)
            width = Dimension.value(360.0.dp)
            height = Dimension.fillToConstraints
        }) {
            for (i in 0..30) {
                Box(
                    Modifier.size(135.dp, 60.dp).background(Color.Red)
                        .drawBorder(1.dp, Color.Black)
                ) {
                    //  Text("scrrt scrrt")
                    for (i2 in 0..40 step 2)
                        Box(
                            Modifier.size((135 - i2).dp, (60 - i2).dp).background(Color.Red)
                                .drawBorder(1.dp, Color.Black)
                        ) {

                        }
                }
            }
        }
    }
}

Uncomment // Text("scrrt scrrt") and scrolling is pretty stuttery (even without the many cascading boxes) But with text, and height = Dimension.value(600.dp), the lag is gone. Without the ConstraintLayout there is also no lag. Am I doing something silly? I'll create an issue if I'm not 🙂 Using dev 16, though was equally an issue in 15 that I've just potentially isolated

sorry if this has been covered before but .....am using

Scaffold

and the

LazyColumnFor

looks to be overlapping with

BottomAppBar

...is there some modifier etc I should be using in this case (will add more code in thread)....

How would I implement this feature in question in this post without using Views?: https://stackoverflow.com/questions/2302867/android-how-to-determine-character-index-of-a-touch-events-position-in-textvie

In terms of performance, is ConstraintLayout() more "expensive" than layouting with other Composables, like in the old UI toolkit?

What is the equivalent in Compose of

adjustPan

so that the keyboard does not hide an

OutlinedTextField

?

Is there an equivalent to

View.setVisibility

on Composables? I’d like to hide a Composable when needed but not just change its opacity because this means it still catches onClicks!

How can I close the software keyboard in onClick on a button? I can see we get

softwareKeyboardController

in

onImeActionPerformed

but what about other places? I didn’t find an Ambient for this

I have this issue where after interacting with TextFields, future touches have an offset. Anyone else experienced something similar ?

Is there a Table component in Jetpack Compose?

I am going to start learning Jetpack compose. But the library is still in developer preview. Is it the right time to start learning or can i just wait for upto some pre-release builds. Because i heard that there are some major API changes happening. Feel free to mention your suggestions guys. Thanks

I too will like to start learning Jetpack compose. Any suggestions on good starting points in order to get started with the library. I know it is in developer preview and it's difficult to find starting points that are up to date

Hi. On Canary 4.2 Alpha 07 I have an annoying error:

Failed to resolve: org.jetbrains.kotlin:kotlin-stdlib:1.4-M3

I don't have any usage of 1.4-M3 in my gradle files. My kotlin version in project level gradle file is 1.3.70. This is almost a new project and I haven't made many changes.

In following I have

scaffold

with

bodyContent

containing a list (using

LazyColumnFor

) and a

BottomAppBar

....selecting different options in bottom bar causes some state to change and for UI to be recomposed (with content of list updated).....the only issue is that list position remains the same. Is there way I can/should reset that when I select different option? https://github.com/joreilly/BikeShare/blob/master/app/src/main/java/com/surrus/bikeshare/MainActivity.kt

What does this mean "Class 'androidx.compose.ui.Modifier' is compiled by a new Kotlin compiler backend and cannot be loaded by the old compiler"? I am already using the latest kotlin compiler 1.4.0-rc. I don't understand.

What's the difference between LazyColumnFor and AdapterList?

@John O'Reilly interesting that you got kotlinx.serialization to work with Jetpack Compose

running into weird UI issue with bottomdrawerlayout - i'm seeing this weird surface color persisting behind my content for the drawerContent that I can't mask or get rid of. As you can see from the top left and right next to my rounded corners is the background surface of the root composable

Hi all! Is there a possibility to get a segment for a path? With the old android paths there is a method getSegment which gets a segment from a path. In the "old" world I could fetch the material background drawable, get the path of the outline and animate a segment along that path. In this way I can basically animate the outline of any given shape. I want to achieve the effect of the button in this video:

Do you expect to accept viewmodels in preview? Or is it disabled by design? I’m trying to create some kind of components which depends on states - in old approach I’ll use viewModel to handle lifecycle (like binding to service etc) and reuse some state. In compose I tried to pass viewModel as a parameter to composable - but I cannot use

@Preview

now. Any ideas how to achive it? My goal is to create a standalone component based on custom library / framework with defined fetching messages or something 🙂

Does anyone else sees the following problem in `0.1.0-dev16`:

Class 'androidx.compose.runtime.Composable' is compiled by a new Kotlin compiler backend and cannot be loaded by the old compiler

I can see this even though app is compiling and running on my device

Any updated examples with ConstraintLayout? After update to v16 cannot resolve `tag`:

ConstraintSet {
   val image = tag(HEADER_MESSAGE_IMAGE_TAG)
   ...
}

Was looking for some similar id like

layoutId

but cannot see anything

If I try to specify the width of a TextField, it sets the editable section to that width, but centres it in a fixed-width container. Is this expected behaviour? It's certainly not what I expected...

Column {
  TextField(value = "", onValueChange = { }, label = {}, modifier = Modifier.width(50.dp))
  TextField(value = "", onValueChange = { }, label = {}, modifier = Modifier.width(100.dp))
  TextField(value = "", onValueChange = { }, label = {}, modifier = Modifier.width(150.dp))

}

If I want to use dev16 and so I have to use compiler version 1.4.0-rc, how I can use the preview if until Canary 8 ?

There isn’t a Composable yet for a Checkbox that includes a correctly-positioned text label, is there?

Checkbox

requires an

onCheckChanged

function, which is unfortunate if you want to make the label clickable as well, since now you’re passing the same handler twice, and the checkbox itself is still clickable but with its own ripple.

where is “darkColorPalette” in 0.1.0-dev16

Hey folks! Is there a place where I can read about compose compiler and runtime besides the source code itself? I wanna start hacking with it a bit 🙂

Hey folks! I am trying to draw a

VectorDrawable

in the Canvas. I can only see methods like

drawLine

,

drawCircle

or

drawImage

etc, but there's no method for either bitmap drawing (like I get bitmap from VectorDrawable) or directly for

VectorAsset

. I did tried it using the the vector path in form of string like in this example (https://github.com/JorgeCastilloPrz/ComposeFillableLoaders) from @Jorge Castillo . But, I am not able to fill color inside the path with this method. I want to fill the whole drawable from inside. Can anyone tell me how can I do this?