Jetpack Compose: state is captured in lambda and not updated-CodePudding

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.

CodePudding user response：

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

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

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