focusRequester

@Composable
fun RequestFocusSample() {
    val focusRequester = remember { FocusRequester() }
    var color by remember { mutableStateOf(Black) }
    Box(
        Modifier
            .clickable { focusRequester.requestFocus() }
            .border(2.dp, color)
            // The focusRequester should be added BEFORE the focusable.
            .focusRequester(focusRequester)
            // The onFocusChanged should be added BEFORE the focusable that is being observed.
            .onFocusChanged { color = if (it.isFocused) Green else Black }
            .focusable()
    )
}