EditText.maxLength.kt

fun EditText.maxLength(length: Int?): InputFilter.LengthFilter? {
    if (length == null) {
        filters = filters.filter { it !is InputFilter.LengthFilter }.toTypedArray()
        return null
    }

    val lengthFilter = InputFilter.LengthFilter(length)
    filters = filters.filter { it !is InputFilter.LengthFilter }
        .toMutableList()
        .apply { add(lengthFilter) }.toTypedArray()
    return lengthFilter
}

var EditText.maxLength: Int?
    set(value) { maxLength(value) }
    get() = filters.filterIsInstance<InputFilter.LengthFilter>().firstOrNull()?.max