Why state update not reflected on AndroidView

Question

In Jetpack Compose, I have an AndroidView with a listener that reads the state passed like this:

@Composable
fun Scanner(
    state: ScannerState,
    modifier: Modifier = Modifier,
) {
    AndroidView(
        modifier = modifier,
        factory = { context ->
            ScannerView(context).apply {
                onButtonClicked = {
                    if (state.isLoading) <-- HERE I READ THE STATE   
                        ...
                    }
                }
            }
        },

The problem comes when the state is updated and the view recomposed. If the onButtonClicked callback is invoked again after that, it holds the initial state, and it's not reading the last updated state that this function received.

Answer 1

factory is getting called only once, when the view is created. That's why the lambda captures only the initial state.

To pass the updated state, you need to use update argument, like this:

AndroidView(
    modifier = modifier,
    factory = { context ->
        ScannerView(context)
    },
    update = { view 
        view.onButtonClicked = {
            if (state.isLoading) {
                ...
            }
        }
    },
)