Question

我正在使用Xamarin开发Android应用程序，并希望使用datePicker在editText字段上设置日期。当我们点击editText时，datePicker会打开，但是当设置了日期时，日期不会显示在editText上。提供的代码有什么问题。

提前致谢。

 public class PageFragment : Android.Support.V4.App.Fragment
    {
        int _num;
        database baseObj = new database();
        EditText datePickerText;

        DatePickerDialog Date;
        View v;
        public PageFragment()
        {
        }
        public PageFragment(int num)
        {
            // Supply num input as an argument.
            var args = new Bundle();
            args.PutInt("num", num);
            Arguments = args;
        }
        public override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            _num = Arguments != null ? Arguments.GetInt("num") : 1;
        }
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            v = inflater.Inflate(Resource.Layout.distribution, container, false);
            datePickerText = v.FindViewById<EditText>(Resource.Id.editTextCalender);
            datePickerText.Focusable = false;
            datePickerText.Click += delegate
            {
                var dialog = new DatePickerDialogFragment(Activity, DateTime.Now, null);
                dialog.Show(FragmentManager, "date");
            };
            return v;

        }
        public void OnDateSet(Android.Widget.DatePicker view, int year, int monthOfYear, int dayOfMonth)
        {
            v.FindViewById<EditText>(Resource.Id.editTextCalender).Text = new DateTime(year, monthOfYear + 1, dayOfMonth).ToString();
        }
        public class DatePickerDialogFragment : Android.Support.V4.App.DialogFragment
        {
            private readonly Context _context;
            private DateTime _date;
            private readonly DatePickerDialog.IOnDateSetListener _listener;
            public DatePickerDialogFragment(Context context, DateTime date, DatePickerDialog.IOnDateSetListener listener)
            {
                _context = context;
                _date = date;
                _listener = listener;
            }
            public override Dialog OnCreateDialog(Bundle savedState)
            {
                var dialog = new DatePickerDialog(_context, _listener, _date.Year, _date.Month - 1, _date.Day);
                return dialog;
            }
        }
    }

Answer 1

我知道回答你的问题已经很晚了。希望你已经解决了你的问题。我得到了为什么editTextCalender无法显示您通过DatePickerDialog设置的日期的答案。你必须改变以下代码行

 public void OnDateSet(Android.Widget.DatePicker view, int year, int monthOfYear, int dayOfMonth)
    {
        v.FindViewById<EditText>(Resource.Id.editTextCalender).Text = new DateTime(year, monthOfYear + 1, dayOfMonth).ToString();
    }

进入（纠正一个）

 public void OnDateSet(Android.Widget.DatePicker view, int year, int monthOfYear, int dayOfMonth)
    {
        datePickerText.Text = new DateTime(year, monthOfYear + 1, dayOfMonth).ToString();
    }

因为在处理点击事件之前，您在创建视图时已经夸大了datePickerText = v.FindViewById<EditText>(Resource.Id.editTextCalender);。

谢谢！

使用Xamarin的日期选择器对话框

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