Android使用NumberPicker实现滑轮日期选择器

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:gravity="center">
   <!--年份滑轮-->
    <NumberPicker
        android:id="@+id/yearPicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:selectionDividerHeight="0dp" />
    <!--月份滑轮-->
    <NumberPicker
        android:id="@+id/monthPicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:selectionDividerHeight="0dp" />
    <!--天数滑轮-->
    <NumberPicker
        android:id="@+id/dayPicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:selectionDividerHeight="0dp" />
</LinearLayout>

@RequiresApi(Build.VERSION_CODES.Q)
class TimePickerView(context: Context, attrs: AttributeSet) : LinearLayout(context, attrs) {
    var yearPicker: NumberPicker
    var monthPicker: NumberPicker
    var dayPicker: NumberPicker
    init {
        LayoutInflater.from(context).inflate(R.layout.time_picker_view, this)
        yearPicker = findViewById(R.id.yearPicker)
        monthPicker = findViewById(R.id.monthPicker)
        dayPicker = findViewById(R.id.dayPicker)
        //设置NumberPicker不可编辑
        yearPicker.descendantFocusability = NumberPicker.FOCUS_BLOCK_DESCENDANTS
        monthPicker.descendantFocusability = NumberPicker.FOCUS_BLOCK_DESCENDANTS
        dayPicker.descendantFocusability = NumberPicker.FOCUS_BLOCK_DESCENDANTS
        //设置字体大小
        yearPicker.textSize = 60f
        monthPicker.textSize = 60f
        dayPicker.textSize = 60f
        //设置不可循环
        yearPicker.wrapSelectorWheel = false
        val date = Date(System.currentTimeMillis())
        val yearPickerText = SimpleDateFormat("yyyy");// HH:mm:ss
        val monthPickerText = SimpleDateFormat("MM");// HH:mm:ss
        // 设置年份范围
        yearPicker.minValue = 1983
        yearPicker.maxValue = 2063
        yearPicker.value = yearPickerText.format(date).toInt()
        // 设置月份范围
        val months =
            arrayOf("1月", "2月", "3月", "4月", "5月", "6月", "7月", "8月", "9月", "10月", "11月", "12月")
        monthPicker.minValue = 1
        monthPicker.maxValue = 12
        monthPicker.displayedValues = months
        monthPicker.value = monthPickerText.format(date).toInt()
        // 设置日期范围（根据年份和月份动态设置）
        updateDayPicker(yearPicker.value, monthPicker.value)
        // 监听年份和月份的变化
        yearPicker.setOnValueChangedListener { _, _, _ ->
            updateDayPicker(yearPicker.value, monthPicker.value)
        }
        monthPicker.setOnValueChangedListener { _, _, _ ->
            updateDayPicker(yearPicker.value, monthPicker.value)
        }
        // 监听日期的变化
        dayPicker.setOnValueChangedListener { _, _, dayOfMonth ->
            val selectedDate = "${yearPicker.value}-${monthPicker.value}-$dayOfMonth"
        }
    }
    private fun updateDayPicker(year: Int, month: Int) {
        val calendar = Calendar.getInstance()
        calendar.set(year, month - 1, 1)
        val maxDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH)
        val date = Date(System.currentTimeMillis())
        val dayPickerText = SimpleDateFormat("dd")
        dayPicker.minValue = 1
        dayPicker.maxValue = maxDay
        dayPicker.value = dayPickerText.format(date).toInt()
    }
}