A quick and dirty way to do AutoCompleteTextViews in Jetpack Compose. Needs improvement in the UX (hide cursor when item selected) and nicer API and probably more.

AutoCompleteTextComposable.kt

var selectedOptionText by remember { mutableStateOf("") }

val options = listOf("Cupcake", "Donut", "Eclair", "Froyo", "Gingerbread")
val filtered = options
    .filter { it.lowercase().contains(selectedOptionText.lowercase()) }

val expanded = selectedOptionText.isNotEmpty() && filtered.isNotEmpty()
        && options.none { it.lowercase() == selectedOptionText.lowercase() }
ExposedDropdownMenuBox(
    expanded = expanded,
    onExpandedChange = {}
) {
    TextField(
        value = selectedOptionText,
        onValueChange = {
            selectedOptionText = it
        },
        colors = ExposedDropdownMenuDefaults.textFieldColors()
    )

    ExposedDropdownMenu(
        expanded = expanded,
        onDismissRequest = {}
    ) {
        filtered.forEach { selectionOption ->
            DropdownMenuItem(
                onClick = {
                    selectedOptionText = selectionOption
                }
            ) {
                Text(text = selectionOption)
            }
        }
    }
}