您可以使用自定义的适配器来实现这个功能。下面是一个示例代码：

1. 创建一个自定义的适配器类：

class CityAdapter(context: Context, private val cities: List) : ArrayAdapter(context, 0, cities) {

    override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
        val view = convertView ?: LayoutInflater.from(context).inflate(android.R.layout.simple_dropdown_item_1line, parent, false)
        val city = cities[position]
        val textView = view.findViewById(android.R.id.text1)
        textView.text = city.name
        return view
    }

    override fun getFilter(): Filter {
        return object : Filter() {
            override fun performFiltering(constraint: CharSequence?): FilterResults {
                val results = FilterResults()
                results.values = if (constraint.isNullOrEmpty()) cities else cities.filter { it.name.contains(constraint.toString(), ignoreCase = true) }
                results.count = (results.values as List).size
                return results
            }

            override fun publishResults(constraint: CharSequence?, results: FilterResults?) {
                @Suppress("UNCHECKED_CAST")
                clear()
                addAll(results?.values as List)
                notifyDataSetChanged()
            }

            override fun convertResultToString(resultValue: Any?): CharSequence {
                return (resultValue as? City)?.name ?: ""
            }
        }
    }
}

2. 创建一个数据类来表示城市：

data class City(val name: String, val code: String)

3. 在您的 Activity 或 Fragment 中使用 AutoCompleteTextView 和上面的适配器：

val cities = listOf(
    City("北京", "BJ"),
    City("上海", "SH"),
    City("广州", "GZ"),
    // 添加更多的城市...
)

val autoCompleteTextView = findViewById(R.id.autoCompleteTextView)
val adapter = CityAdapter(this, cities)
autoCompleteTextView.setAdapter(adapter)
autoCompleteTextView.setOnItemClickListener { parent, view, position, id ->
    val selectedCity = parent.getItemAtPosition(position) as City
    val cityName = selectedCity.name
    val cityCode = selectedCity.code
    // 处理点击事件，获取两个值 cityName 和 cityCode
}

这样，当用户在 AutoCompleteTextView 中输入文字时，它会根据输入的内容过滤出匹配的城市，并显示在下拉列表中。当用户选择一个城市时，您可以通过 OnItemClickListener 获取到选中的城市的名称和代码。