如何在Kotlin中使用DatePickerDialog？

import android.app.DatePickerDialog
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*
import java.util.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // 设置点击事件，显示日期选择对话框
        dateButton.setOnClickListener {
            showDatePickerDialog()
        }
    }

    private fun showDatePickerDialog() {
        // 获取当前日期
        val calendar = Calendar.getInstance()
        val year = calendar.get(Calendar.YEAR)
        val month = calendar.get(Calendar.MONTH)
        val day = calendar.get(Calendar.DAY_OF_MONTH)

        // 创建日期选择器对话框实例
        val datePickerDialog = DatePickerDialog(this, { view, selectedYear, selectedMonth, selectedDay ->
            // 处理用户选择的日期
            val selectedDate = "$selectedYear-${selectedMonth + 1}-$selectedDay"
            dateTextView.text = selectedDate
        }, year, month, day)

        // 显示日期选择器对话框
        datePickerDialog.show()
    }
}