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#compose
Title
# compose
a
Ahmet Delibaş
01/20/2021, 1:53 PMI have a state
Copy code
var current by remember { mutableStateOf(0) }a
Adam Powell
01/20/2021, 3:07 PMCan you post some more of the affected code that isn't behaving the way you expect?
a
Ahmet Delibaş
01/21/2021, 6:10 AM Copy code
@Composable
fun StoryCaptureScreen(
backAction: () -> Unit,
modifier: Modifier,
) {
var currentCam by remember { mutableStateOf(0) }
val switchAction = { currentCam = switchCamera(currentCam) }
Box(modifier = modifier.fillMaxSize()) {
StoryCamera(currentCam)
StoryCaptureOverlayUI(backAction, modifier, switchAction)
}
} Copy code
@Composable
fun StoryCamera(currentCam: Int) {
val lifecycleOwner = AmbientLifecycleOwner.current
val context = AmbientContext.current
val cameraProviderFuture = ProcessCameraProvider.getInstance(context)
AndroidView(
viewBlock = {
PreviewView(context).apply {
cameraProviderFuture.addListener({
val cameraProvider = cameraProviderFuture.get()
bindPreview(
lifecycleOwner,
this,
cameraProvider,
currentCam
)
}, ContextCompat.getMainExecutor(context)
)
scaleType = PreviewView.ScaleType.FILL_CENTER
} },
modifier = Modifier.fillMaxSize(),
)
}in uı there is switch button. If I click, then currentCam value changes.
Then recompose process starts. But AndroidView is not recomposed. I logged the code, last stop is cameraProviderFuture, just before the AndroidView.
a
Adam Powell
01/21/2021, 6:17 AMfrom `AndroidView`'s docs: "The [viewBlock] block will be called exactly once to obtain the [View] to be composed" - that construction block never recomposes. You need to use the trailing lambda update block to apply changes from recomposition.
a
Ahmet Delibaş
01/21/2021, 6:28 AMYes I read the document. But in the document it says:
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AndroidView({ customView }) { view ->
// View's been inflated - add logic here if necessary
// As selectedItem is read here, AndroidView will recompose
// whenever the state changes
// Example of Compose -> View communication
view.coordinator.selectedItem = selectedItem.value
}BUt I cannot use coordinator ? There is no object like coordinator in view.
I found the answer. So thanks.
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