如何禁用日期选择器Dialouge片段上的最小日期

Question

我正在使用以下代码在xamarin.android上显示dialogefragment，我有2个问题。

1. 我如何将默认的选择日期设置为当前日期（当前是显示下个月）？

2. 我如何在Dialougefragment上禁用过去的日期？

   new DatePickerFragment(delegate (DateTime time)
           {
   
           var _selectedDate = time;
           txtDateTime.Text = _selectedDate.ToString("yyyy.MM.dd");
   
       }) .Show(FragmentManager, DatePickerFragment.TAG);
   

Answer 1

如何将默认的选择日期设置为当前日期（当前显示在下个月？）>

如果要将默认选择的日期设置为当前日期，则可以设置DatePickerDialog日期时间。

DateTime currently = DateTime.Now;
DatePickerDialog dialog = new DatePickerDialog(Activity, this, currently.Year, currently.Month,
                                                       currently.Day);
dialog.DatePicker.DateTime = currently;
如何禁用Dialougefragment上的过去日期？

您可以将今天的日期设置为最短日期。

dialog.DatePicker.MinDate = Java.Lang.JavaSystem.CurrentTimeMillis();
这里是DatePickerFragment.cs：

 public class DatePickerFragment : DialogFragment, DatePickerDialog.IOnDateSetListener
{
    // TAG can be any string that you desire.
    public static readonly string TAG = "X:" + typeof (DatePickerFragment).Name.ToUpper();
    Action<DateTime> _dateSelectedHandler = delegate { };

    public void OnDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
    {
        // Note: monthOfYear is a value between 0 and 11, not 1 and 12!
        DateTime selectedDate = new DateTime(year, monthOfYear + 1, dayOfMonth);
        Log.Debug(TAG, selectedDate.ToLongDateString());
        _dateSelectedHandler(selectedDate);
    }

    public static DatePickerFragment NewInstance(Action<DateTime> onDateSelected)
    {
        DatePickerFragment frag = new DatePickerFragment();
        frag._dateSelectedHandler = onDateSelected;
        return frag;
    }

    public override Dialog OnCreateDialog(Bundle savedInstanceState)
    {
        DateTime currently = DateTime.Now;
        DatePickerDialog dialog = new DatePickerDialog(Activity, this, currently.Year, currently.Month,
                                                       currently.Day);
        dialog.DatePicker.DateTime = currently;


       dialog.DatePicker.MinDate = Java.Lang.JavaSystem.CurrentTimeMillis();

        return dialog;
    }
}
MainActivity.cs：

public class MainActivity : Activity
{
    TextView _dateDisplay;
    Button _dateSelectButton;

    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);
        SetContentView(Resource.Layout.Main);

        _dateDisplay = FindViewById<TextView>(Resource.Id.date_display);
        _dateSelectButton = FindViewById<Button>(Resource.Id.date_select_button);
        _dateSelectButton.Click += DateSelect_OnClick;
    }

    void DateSelect_OnClick(object sender, EventArgs eventArgs)
    {
        DatePickerFragment frag = DatePickerFragment.NewInstance(delegate(DateTime time)
                                                                 {

                                                                     _dateDisplay.Text = time.ToLongDateString();
                                                                 });
        frag.Show(FragmentManager, DatePickerFragment.TAG);
    }
}
截图：

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