Is it possible to define

@Composable

s in a kotlin multiplatform library-module and (re-)use those in android app-modules of the same project? I get these errors when building the project:

Caused by: org.jetbrains.kotlin.codegen.CompilationException: Back-end (JVM) Internal error: Couldn't inline method call 'remember' into
@androidx.compose.runtime.Composable public fun [...]

In the Compose tutorials, it is advised to use State in the ViewModel as much as possible because it makes the code simpler and it's right BUT is State lifecycle aware like LiveData ? Can we achieve the same ?

Having trouble using

SwipeToRefresh()

from JetNews with

LazyColumnFor

, more specifically doesn’t detect the swipe (just like I wouldn’t have the SwipeToRefresh component). I’m guessing it’s because the

swipeable()

setup conflicts somehow with the

LazyColumnFor

. Any ideas where should I look for?

Hey Folks, We are planning to develop a brand new Kotlin based Android project using Jetpack Compose and we are going to use bottom navigation view, drawer view, navigation components, co-ordinate layout kind of effects, paging 3.0 etc. I see that it is still in alpha and may release in 2021. We may release our app in Q2 2021, is it good idea to consider Jetpack Compose for development or we need to go with traditional layout based UI? Is Jetpack Compose supports all the components? Are there any apps in the playstore which are Jetpack Compose based? Any help will be much appreciated. Thanks.

Made this color picker today in just 200 lines (there could be less if I didn't need some color conversion utils). It can be updated with touch events or hex input

Hi guys! On my android api 23 device I cannot put in capital characters. If I push the shift character, a

\u0000

is inserted and the keyboard switches right away to lowercase characters. Is there already a bug for this?

I think

RadialGradient

is not working properly as of alpha06. I want to draw a simple circle that have white color from center to

0.5 * radius

and then have a uniform blend from white to black from

0.5 * radius

to

radius

. What I did is

Canvas(modifier = Modifier.fillMaxSize()) {
    drawCircle(
        brush = RadialGradient(
            0.0f to Color.White,
            0.5f to Color.White,
            1.0f to Color.Black,
            centerX = center.x,
            centerY = center.y,
            radius = size.width
        )
    )
}

This code displays the whole circle in white.

I added bottomNavigation to scaffold. However, the bottom of the content of the scaffold is covered by the bottom navigation. What should I do?

How to put compose preview in a landscape mode? I've set the

widthDp

accordingly with

showDecoration=true

but still the view looks like a portrait mode only

Using the new navigation for Compose, can I use

Parcelable

arguments or is it only uri-based arguments that can be parse to primitive types?

Looks like using custom vector drawables using

vectorResource()

messes up with the fill color of vector drawable based on the current theme (dark theme inverts the color). I tried using same vector drawable in a non-compose project and colors remained the same.

Is there any way I could preview colors (gutter) defined in .kt file?

I am trying to introduce compose to an existing project. But I am getting this error:

java.lang.NoSuchMethodError: No virtual method setContent(Lkotlin/jvm/functions/Function0;)V in class Landroidx/compose/ui/platform/ComposeView; or its super classes (declaration of 'androidx.compose.ui.platform.ComposeView' appears in /data/app/bd.com.qualityfoods.app-LVPKnecUB1gsJPhJDkqZfA==/base.apk)
        at com.conceptgang.app.page.home.HomeFragment.onCreateView(HomeFragment.kt:76)
        at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2898)
        at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:527)
        at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1324)
        at androidx.fragment.app.FragmentManager.addAddedFragments(FragmentManager.java:2392)
        at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2137)
        at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:2061)
        at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1957)
        at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:496)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:201)
        at android.app.ActivityThread.main(ActivityThread.java:6826)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)

LocaleList.current

How do I save state inside

LazyColumnFor

? Each

requestItem

is a network call that gets executed when I scroll back and forth.

Is there a composable for a material toggle button in compose stdlibs? (ie mutually exclusive button group sharing a container)

Has anyone done any adventure project with

BackdropScaffold

? I am trying to build a horizontal backdrop and was looking for some reference project

Anyone tried BottomDrawerLayout with fab? I cant fix its height and the fab appears when bottomdrawerlayout opens , any project on github to show this usecase?

Hello, sorry if it has been asked before but with AS 4.2 canary 16, and latest compose version, IntelliJ doesn't find any kotlin specific methods (like listOf(), forEach{} ) even in non-composable function. The code still compile and works... Is there any fix/workaround ? I couldn't find an issue about that

message has been deleted

I am getting some weird error with the new Compose Navigation.

NavHost(navController, startDestination = "home"){
        composable("new-item"){NewItem(navController)}
        composable("profile/{name}", listOf(navArgument("name"){type = NavType.StringType}))
        {navBackStackEntry ->
            Profile(navBackStackEntry.arguments?.getString("name").toString())
        }

        composable("home?costName={costName}&costValue={costValue}",
                arguments = listOf(navArgument("costName"){nullable = true}, navArgument("costValue"){type = NavType.IntType; defaultValue = 0})){
            navBackStackEntry ->  Home(navController, navBackStackEntry.arguments?.getString("costName"), navBackStackEntry.arguments?.getInt("costValue"))
        }
    }

//    java.lang.IllegalArgumentException: navigation destination 150924488 is not a direct child of this NavGraph
//    at androidx.navigation.NavGraphNavigator.navigate(NavGraphNavigator.java:66)

How can I start the text field to middle of screen ? This is not starting Text from the center

Column(
    modifier = Modifier.padding(start = 10.dp)
) {

    Spacer(modifier = Modifier.fillMaxHeight(0.5F).fillMaxWidth())
    Text(
        text = "Provider name",
        style = TextStyle(
            color = Color.White,
            fontSize = 14.sp,
            fontWeight = FontWeight.Bold,
            textAlign = TextAlign.Center
        )
    )

    Text(
        text = "Provider Address",
        style = TextStyle(
            color = Color.White,
            fontSize = 11.sp,
            textAlign = TextAlign.Center
        )
    )

    // setRatingBar()
}

I want to start “Provider name” from vertical center

I would like to mimic the liftOnScroll capability of AppBarLayout and therefore have to observe the scroll offset of a LazyColumn. Unfortunately I can’t find a way to do so. Is this something missing at the moment?

Is there a difference between BottomSheetScaffold and BottomDrawerLayout? I tried both of them and found BottomSheet doesnt overshadow or come above the content on the screen behind it , Any idea🤔

Hi Guys! I want to ask what is the best way to do something... I want to create a Composable ("view") to do a TimeLine (for example), and this will contains an icon, color and content for each "row" But, what I'm not sure is... if each row has a title, what's the best way? make a composable function with lambda that returns a String? What about icon? A lambda that returns an Asset? Or instead, a composable lambda to allow user to customize the title / icon... so it will allow change the size of the icon etc... TL;DR: What I'm not sure in compose is... how I allow customization of content with some constrained rules about style / size etc...

I’m noticing that if I apply a scale transformation on a container

Box

(with

.drawLayer

modifier) the input events are not properly transformed and looks like the button events are triggered by touch events on their original (not transformed) position. Is this something expected or a bug?

Hi everyone! I’m using the new navigation with a bottom navigation bar. I was trying to hide the bottom navigation when I’m showing a detail screen but when I try to navigate to the detail there is glitch. The detail screen is showed for less than a second and then the starting screen is show (it seems that there is a recomposition to the initial state). Did I miss something? Here’s the code to reproduce the issue: https://github.com/prof18/ComposeNavigationTest/blob/master/app/src/main/java/com/prof18/composenavigationsample/MainActivity.kt

Please recommend an image loader. Which image loader do you use?

Hey, I have

ModalBottomSheetLayout

which contains a

TextInput

, and when it gets focus the keyboard appears above the sheet (z-index style) -> the sheet doesn't slide up to the top of the keyboard. Is there any way to fix this?