Hi, I’m learning to use Compose and I’m trying to use Tab in a layout like this

class TabContent(val header: String, val icon: Int, val content: @Composable () -> Unit)

@Composable
fun BodyContent() {
    var index = 0
    val updateTab : (currentIndex: Int) -> Unit = { index = it }

    val tabs = listOf(
        TabContent(
            header = stringResource(id = R.string.depenses_tab_title).toUpperCase(
                Locale.getDefault()
            ),
            icon = R.drawable.ic_depenses
        ) { DepenseTabContent(Modifier) },
        TabContent(
            header = stringResource(id = R.string.equilibre_tab_title).toUpperCase(
                Locale.getDefault()
            ),
            icon = R.drawable.ic_equilibres
        ) { Text ( text= "blop") }
    )

    BodyContent(index, updateTab, tabs)
}

@Composable
fun BodyContent(
    selectedTabIndex: Int,
    updateTab: (Int) -> Unit,
    tabs: List<TabContent>,
    modifier: Modifier = Modifier
) {
    Column(modifier.fillMaxSize()) {
        TabRow(selectedTabIndex = selectedTabIndex) {
            tabs.forEachIndexed { index, tabContent ->
                Tab(
                    selected = selectedTabIndex == index,
                    onClick = { updateTab(index) },
                    text = { Text(text = tabContent.header) },
                    icon = {
                        Icon(
                            vectorResource(id = tabContent.icon),
                            Modifier.width(24.dp).height(24.dp)
                        )
                    }
                )
            }
        }
        Box {
            tabs[selectedTabIndex].content
        }
    }
}

My tab content is never displayed and I can’t refresh it by clicking in the tabRow. I don’t understand what I’v done wrong.

Could you please point me to resources about responsive layouts in Jetpack Compose? I have a UI which looks right on XL screens but really huge on smaller screens. I put my layout in a Column with max width and height so I thought the layout would be responsive in that sense, but it does not appear to be the case...

Is it intended behavior that the

Switch

invokes the

onChangedActive

after first composition? Because that sounds weird

LazyColumnFor is cant smooth scrolling.What is the problem?

Hi there, anyone managed to run compose + android kotlin extensions (synthetics)?

still can not give it a try because of this issue

I'm curious about how we can make a manually scrollable marquee for long text, so I've asked how to on stackoverflow : https://stackoverflow.com/questions/63838973/how-to-make-a-manually-scrollable-marquee-by-touch-or-mouse-touchpad-scroll-in If one knows how, or if Jetpack Compose team can respond it's not supported yet, feel free to answer it.

Now that Kotlin 1.4.10 is out do I update this number in this block?

composeOptions {
    kotlinCompilerExtensionVersion MyVersions.compose_version
    kotlinCompilerVersion '1.4.0' <====== This number
}

Hi 👋 Is there any way to preview compose icons (e.g.

Icons.Outlined.MailOutline

) in the IDE?

How to programmatically take screenshot of composable function?

Noob question 🙈 - does

Text

have a way to all caps text or do I need to use

String.toUpperCase()

method?

How can I animate FAB position from

FabPosition.End

to

FabPosition.Center

?

So fwiw I do think I have my dagger hilt + compose example working as expected. I didn’t think that compose’s built in

viewModel

function would be compatible with Hilt’s system, which was my main mental hurdle. The following works just fine as far as I know. Are there any caveats to using this approach? Will this work fine for more complex scenarios?

@AndroidEntryPoint
class MainActivity: AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            MyApplicationTheme {
                // A surface container using the 'background' color from the theme
                Surface(color = MaterialTheme.colors.background) {
                    Counter()
                }
            }
        }
    }
}

@Composable
fun Counter() {
    val viewModel = viewModel<CounterViewModel>()
    val state by viewModel.counter.observeAsState(0)

    Column(
        modifier = Modifier
            .clickable(onClick = viewModel::increment)
            .padding(all = 36.dp)
    ) {
        Text(text = "Counter $state")
    }
}

@ActivityScoped
class CounterViewModel @ViewModelInject constructor(): ViewModel() {
    private var _counter: MutableLiveData<Int> = MutableLiveData(1)
    val counter: LiveData<Int> = _counter

    fun increment() {
        _counter.value = _counter.value?.plus(1)
    }
}

when using

repeatable { }

is there any way to have a callback when the animation is repeated?

I am using androidx.compose.material.Slider. Is there an easy way to change the orientation to vertical? Horizontal works great, but I can’t find a vertical example. It looks like material for angular has a simple vertical attribute.

Is anyone having a problem with the Crane sample app not rendering google maps?

I am starting to learn SwiftUI and it’s so much the same as JetpackCompose, much more than I expected! Just the syntax is different. At the same time, I also understand why JetpackCompose is not going to follow the same mobile cross-platform road of Flutter, by writing directly into the iOS canvas. I can see how SwiftUI is awesomely tight to the iOS framework, and how a “foreign” UI could never match that. I am very impressed by how the exact same SwiftUI control renders differently on iPhone, iPad, Mac or iWatch, and that is all managed by the OS framework. Given how similar the code structure between JetpackCompose and SwiftUI is, I believe transpiling from JetpackCompose to SwiftUI makes much more sense than JetpackCompose writing into iOS canvas. And I believe JetBrains is very much aware of that. Given their experience in this kind of stuff, they could probably create a JetpackCompose->SwiftUI transpiling tool that achieves perfection. For the same reason, I am really starting to understand the limitations of Flutter. It’s quite clear now that Flutter is just a toy project, which cannot stand the competition of native UIs. In the future much more than now, the quality of apps will depend on their native UI look and feel. Apps not implementing the native UI will be perceived of lower quality. I am pretty sure native UI in mobile is going increase its “market share” thanks to these new declarative UIs. In 2 years time we’ll see many more native UI apps than we see now. ReactNative, Xamarin or even Flutter will stand no chance.

How can I get a composable preview to correctly tint a vector/drawable in an

AndroidView

based on the theme that is wrapping it? I'm using an

AndroidView

so that I can use an

ImageView

because I'm being passed a

@DrawableRes

and I don't know if it will be a vector or a drawable.

Currently is there any way to create CollapsibleToolbarLayout in compose? With Scaffold compose?

How to use AVD in Compose?

can any one help me on getting compose samples into android studio. How should I do this? There always shows errors in Build log. Please tell me the correct way to import compose samples.

I'm trying to understand how to use layouts. I have :

Column(Modifier.fillMaxHeight()) {}

Why are the bottom squares no reaching the bottom of the screen? I have not put any padding.

Is it possible to use

val boxModifier = Modifier
    .fillMaxSize() or .fillMaxHeight()
    .weight(1f)

while making sure that the box remains square, so basically, fill the maximum size/height as long as you are square? At the moment I have rectangles which is not looking great...

Anybody receiving errors with Kotlin synthetic in 1.4.10 Kotlin with Compose in AS 4.2 Canary 10?

e: java.lang.AssertionError: Unbound symbols not allowed

My dependency versions: compose: 1.0.0-alpha02 kotlin: 1.4.10 android gradle plugin: 4.2.0.alpha10

Is there a reason why

rememberDismissState

doesn't receive

vararg inputs: Any?

kind of anchor to reset the state if some of the dependencies change? This certainly proved a challenge when I wanted to use

SwipeToDismiss

on list items. Because Lazy APIs reuse the same composable with different data, dismissState has to reset everytime the data changes.

I tried to adapt the Activity Result api to compose but I don't think I've done a good job 😅 It works, but I believe there is a better way to do it. Any suggestions?

@Stable
@Composable
fun <I, O> activityResultLauncher(
    contractKey: String,
    contract: ActivityResultContract<I, O>,
    activityResultCallback: ActivityResultCallback<O>,
): ActivityResultLauncher<I> {
    val lifecycleOwner = LifecycleOwnerAmbient.current
    val registry = ActivityResultRegistryAmbient.current
    val launcher = remember(contract, registry, contractKey) {
        registry.register(contractKey, lifecycleOwner, contract, activityResultCallback)
    }
    onDispose {
        launcher.unregister()
    }
    return launcher
}

@Composable
fun ImportSaveDataFromFile(onImport: (SaveData?) -> Unit) {
    val context = ContextAmbient.current
    var launchActivity by savedInstanceState { false }
    val activityLauncher = activityResultLauncher("ImportSaveData", OpenDocumentContract) { uri: Uri? ->
        onImport(createSaveData(uri, context))
    }
    if (launchActivity) {
        launchActivity = false
        activityLauncher.launch(arrayOf("*/*"))
    }
    Surface(modifier = Modifier.fillMaxSize()) {
        Button(
            modifier = Modifier.fillMaxSize().wrapContentSize(Alignment.Center),
            onClick = { launchActivity = true }
        ) {
            Text(text = "IMPORT SAVE DATA")
        }
    }
}

Getting external padding for topAppBar. Using MaterialTheme -> Surface -> Scaffold with topAppBar = TopAppBar(). (screenshot in the thread). Please help.

Built JetInstagram an Instagram clone with Like Animation and Exoplayer integration for instagram reels feature. Code: https://github.com/vipulasri/JetInstagram

I’m trying to write a painter that can draw other Painters but I’m not sure what the draw code is supposed to look like. I have

Contaner(val painters: List<Painter>): Painter {
  override val intrinsicSize = Size(
    painters.maxOf { it.width },
    painters.sumBy { it.heightRespectingAspectRatio }
  )

  override fun DrawScope.onDraw() {
    var offset = Offset.Zero
    painters.fastForEach { 
      it.??? // :( not sure what to place here, I dont have access to the draw method of the individual painters, how do I tell the painter to draw into the containers canvas 
    }
  } 
}

The end goal, if its clear from the

Size

calculation, is to create a painter that will place each individual painter, in a vertical column, kinda like stitching images together vertically. I want to then be able to run transformations on the container painter (scale, pan etc) driven by gestures.

Algorithm is simple-ish, I want to track the offset of the current painter and draw it into the containers canvas, translating the canvas as necessary. With the

View

system I think it’ll be something like

painters.forEach {
  canvas.withTranslate(offset.x, offset.y) {
    it.draw(canvas)
  }
  offset.y += it.heightRespectingAspectRatio
}

Not sure the equivalent in compose