C# 将Android日期选择器对话框的选项从Unity限制为从当前日期开始

我需要日期选择器对话框选项，以仅允许从当前日期开始，在unity文档中看不到设置选项的选项

void Start() {        
    if (PlayerPrefs.GetString("StartingDateTime") != null) {
        if (PlayerPrefs.GetString("GoalDateTime") != null) {
            startingDate = Convert.ToDateTime(PlayerPrefs.GetString("StartingDateTime"));
            goalDate = Convert.ToDateTime(PlayerPrefs.GetString("GoalDateTime"));
            startingDateLoadedText.text = startingDate.ToString();
            goalDateLoadedText.text = goalDate.ToString();
            totalWeeksInt = PlayerPrefs.GetInt("TotalWeeks");
            SetWeeksToGoalDate();
            SetCurrentWeek();
        }
    }
}

void Update() {

    if (SelectedDate.newDate) {
        if (newSelectedStartingDate) {
            startingDate = SelectedDate.date;
            startingDateText.text = SelectedDate.date.ToString("d/M/yyyy");
            PlayerPrefs.SetString("StartingDateTime", SelectedDate.date.ToString());
            newSelectedStartingDate = false;
        } else if (newSelectedGoalDate) {
            goalDate = SelectedDate.date;
            goalDateText.text = SelectedDate.date.ToString("d/M/yyyy");
            PlayerPrefs.SetString("GoalDateTime", SelectedDate.date.ToString());
            newSelectedGoalDate = false;
        }
        SelectedDate.newDate = false;
    }
}

void PickDate()
{
    new AndroidJavaObject("android.app.DatePickerDialog", activity, new DateCallback(), SelectedDate.date.Year, SelectedDate.date.Month - 1, SelectedDate.date.Day).Call("show");
}

public void SelectStartingDate() {
    activity = new AndroidJavaClass("com.unity3d.player.UnityPlayer").GetStatic<AndroidJavaObject>("currentActivity");
    activity.Call("runOnUiThread", new AndroidJavaRunnable(PickDate));
    newSelectedStartingDate = true;        
}

public void SelectGoalDate()
{
    activity = new AndroidJavaClass("com.unity3d.player.UnityPlayer").GetStatic<AndroidJavaObject>("currentActivity");
    activity.Call("runOnUiThread", new AndroidJavaRunnable(PickDate));
    newSelectedGoalDate = true;        
}

public void SetWeeksToGoalDate() {        
    if (startingDate != null && goalDate != null) {
        TimeSpan goalDateWeeks = goalDate - startingDate;
        int weeks = goalDateWeeks.Days / 7;
        PlayerPrefs.SetInt("TotalWeeks", weeks);
        totalWeeksInt = weeks;
        weightLossPeriodText.text = weeks.ToString();
    }
}

void Start（）{
if（PlayerPrefs.GetString（“StartingDateTime”）！=null）{
if（PlayerPrefs.GetString（“GoalDateTime”）！=null）{
startingDate=Convert.ToDateTime（PlayerPrefs.GetString（“StartingDateTime”）；
goalDate=Convert.ToDateTime（PlayerPrefs.GetString（“GoalDateTime”）；
startingDateLoadedText.text=startingDate.ToString（）；
goalDateLoadedText.text=goalDate.ToString（）；
totalWeeksInt=PlayerPrefs.GetInt（“TotalWeeks”）；
SetWeeksToGoalDate（）；
SetCurrentWeek（）；
}
}
}
无效更新（）{
如果（已选择日期。新日期）{
如果（新选择的开始日期）{
startingDate=所选日期.date；
startingDateText.text=SelectedDate.date.ToString（“d/M/yyyy”）；
PlayerPrefs.SetString（“StartingDateTime”，SelectedDate.date.ToString（））；
newSelectedStartingDate=false；
}else if（新选择的OALDATE）{
goalDate=SelectedDate.date；
goalDateText.text=SelectedDate.date.ToString（“d/M/yyyy”）；
PlayerPrefs.SetString（“GoalDateTime”，SelectedDate.date.ToString（））；
newSelectedGoalDate=false；
}
SelectedDate.newDate=false；
}
}
作废日期（）
{
新的AndroidJavaObject（“android.app.DatePickerDialog”，activity，new DateCallback（），SelectedDate.date.Year，SelectedDate.date.Month-1，SelectedDate.date.Day）。调用（“显示”）；
}
public void SelectStartingDate（）{
activity=newandroidjavaclass（“com.unity3d.player.UnityPlayer”）.GetStatic（“currentActivity”）；
activity.Call（“runOnUiThread”，新的AndroidJavaRunnable（PickDate））；
newSelectedStartingDate=true；
}
public void SelectGoalDate（）
{
activity=newandroidjavaclass（“com.unity3d.player.UnityPlayer”）.GetStatic（“currentActivity”）；
activity.Call（“runOnUiThread”，新的AndroidJavaRunnable（PickDate））；
newSelectedGoalDate=true；
}
public void SetWeeksToGoalDate（）{
如果（开始日期！=null&&goalDate！=null）{
TimeSpan goalDateWeeks=目标日期-开始日期；
整数周=目标日期周。天/7；
PlayerPrefs.SetInt（“总计周”，周）；
totalWeeksInt=周；
weightLossPeriodText.text=weeks.ToString（）；
}
}

我想通过Unity代码在哪里设置选项，或者如果我必须通过Android插件设置插件并重新导入应用程序，请提供一些参考