DatabindingableNumberPicker.kt

class DatabindingableNumberPicker : NumberPicker {
    constructor(context: Context) : super(context)
    constructor(context: Context, attributeSet: AttributeSet) : super(context, attributeSet)
    constructor(context: Context, attributeSet: AttributeSet, defStyleAttr: Int) : super(context, attributeSet, defStyleAttr)

    private var isCallSetMaxValueBeforeSetValue = false
    private var tempValue = 0

    override fun setValue(value: Int) {
        if (!isCallSetMaxValueBeforeSetValue) {
            tempValue = value
            isCallSetMaxValueBeforeSetValue = true
        } else {
            super.setValue(value)
        }
    }

    override fun setMaxValue(maxValue: Int) {
        super.setMaxValue(maxValue)
        if (isCallSetMaxValueBeforeSetValue) {
            value = tempValue
        } else {
            isCallSetMaxValueBeforeSetValue = true
        }
    }
}