使用C#XamarinAndroid在片段中顯示DatePickerDialog

我有一個 EditText 和一個用于 DatePickerFragment 的按鈕，但顯示 DatePickerDialog 和 OnCreateDialog 方法的語法不正確。

這是一個片段，其中我有一個 TextInputLayout/EditText 可以在單擊時訪問以顯示 DatePickerDialog。這是我的代碼，但 ShowDialog() 是錯誤的，并且提示 ShowsDialog() 這也是一個錯誤。

OnCreateDialog 錯誤顯示“CS0115：'AddEventFragment.OnCreateDialog(int)'：找不到合適的方法來覆寫

namespace AdamsonsEDApp.Fragments
{
    public class AddEventFragment : Android.Support.V4.App.DialogFragment, Android.App.DatePickerDialog.IOnDateSetListener
    {
        private int year, month, day;
        TextInputLayout eventdatesetTextt;
        Button eventpickdateButton;

        public override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Create your fragment here
        }

        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            View view = inflater.Inflate(Resource.Layout.newevent, container, false);
            this.Dialog.SetCanceledOnTouchOutside(false);
            eventdatesetText = (TextInputLayout)view.FindViewById(Resource.Id.eventdatesetText)
            eventpickdateButton = (Button)view.FindViewById(Resource.Id.eventpickdateButton);

            eventpickdateButton.Click  = EventpickdateButton_Click;
            return view;
        }

private void EventpickdateButton_Click(object sender, EventArgs e)
        {
            int DatePickerDialogID = 1;
            ShowDialog(DatePickerDialogID);
        }

        public override Dialog OnCreateDialog(int id)
        {
            if (id == 1)
            {
                return new Android.App.DatePickerDialog(this.Activity, this, year, month, day);
            }
            return null;
        }

        public void OnDateSet(DatePicker view, int year, int month, int dayOfMonth)
        {
            this.year = year;
            this.month = month;
            this.day = dayOfMonth;
            eventdatesetText.EditText.Text = year   "/"   month   "/"   dayOfMonth;
        }

對于我嘗試的點擊事件：

private void EventpickdateButton_Click(object sender, EventArgs e)
        {
            int DatePickerDialogID = 1;
            **this.Activity.ShowDialog(DatePickerDialogID);**
        }

它沒有錯誤，但它說這個this.Activity.ShowDialog(DatePickerDialogID) ; 已過時：'已棄用'

從 Fragment 呼叫 DatePickerDialog 時正確的語法是什么？謝謝你。

uj5u.com熱心網友回復：

你可以參考這個檔案。我測驗了官方檔案提供的代碼，也有很多obsolete問題。但是，您可以添加屬性和其他內容來修復它。

這是更改后的代碼：

[Obsolete]
    public class DatePickerFragment : DialogFragment,
                                  DatePickerDialog.IOnDateSetListener
    {
        // TAG can be any string of your choice.
        public static readonly string TAG = "X:"   typeof(DatePickerFragment).Name.ToUpper();

       // Initialize this value to prevent NullReferenceExceptions.
        Action<DateTime> _dateSelectedHandler = delegate { };

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

       [Obsolete]
        public override Dialog OnCreateDialog(Bundle savedInstanceState)
        {
            DateTime currently = DateTime.Now;
            DatePickerDialog dialog = new DatePickerDialog(Activity,
                                                           this,
                                                           currently.Year,
                                                           currently.Month - 1,
                                                           currently.Day);
            return dialog;
        }

       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);
        }
    }

主要活動.cs：

[Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]
    public class MainActivity : AppCompatActivity
    {
        TextView _dateDisplay;
        Button _dateSelectButton;

       [Obsolete]
#pragma warning disable CS0809 // Obsolete member overrides non-obsolete member
        protected override void OnCreate(Bundle savedInstanceState)
#pragma warning restore CS0809 // Obsolete member overrides non-obsolete member
        {
            base.OnCreate(savedInstanceState);
            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.activity_main);
            _dateDisplay = FindViewById<TextView>(Resource.Id.date_display);
            _dateSelectButton = FindViewById<Button>(Resource.Id.date_select_button);
            _dateSelectButton.Click  = _dateSelectButton_Click;
        }

       [Obsolete]
        private void _dateSelectButton_Click(object sender, EventArgs e)
        {
            DatePickerFragment frag = DatePickerFragment.NewInstance(delegate (DateTime time)
            {
                _dateDisplay.Text = time.ToLongDateString();
            });
            frag.Show(FragmentManager, DatePickerFragment.TAG);
        }

       public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
        {
            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
           base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }

希望對您有所幫助。

標籤：C＃视觉工作室xamarin.android

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