Question

我正在使用C＃中的Xamarin Android应用程序，我正在尝试实现一个TimePicker对话框，用户在其中选择给定时间，并且每天都会通知他们（或者一周中的那些日子）他选择了。）

我理解有一个不推荐使用的TimePickerDialog控件，我们现在需要使用Fragment Dialog。如果有人可以帮助我，我会非常感激。

谢谢！

Answer 1

您最好的选择是延长DialogFragment并从中创建自己的TimePickerFragment。 Android甚至还有关于该主题的完整文档：

http://developer.android.com/guide/topics/ui/controls/pickers.html#TimePicker

（注意：你必须转换相应的Java - ＆gt; C＃，但这不应该是一个太大的问题）

public class TimePickerFragment : DialogFragment, TimePickerDialog.IOnTimeSetListener
{
    public override Dialog OnCreateDialog(Bundle savedInstanceState)
    {
        Calendar c = Calendar.Instance;
        int hour = c.Get(CalendarField.HourOfDay);
        int minute = c.Get(CalendarField.Minute);
        return new TimePickerDialog(Activity, this, hour, minute, DateFormat.Is24HourFormat(Activity));
    }

    public void OnTimeSet(TimePicker view, int hourOfDay, int minute)
    {
        //Do something when time chosen by user
    }
}

Answer 2

以下是我如何实现TimePickerDialog

的示例

声明EditText控件（您可以使用TextView）

EditText startTimeInput = FindViewById（Resource.Id.newEventStartTimeInput）;

通过扩展DialogFragment并处理OnCreate和OnTimeSet方法来创建TimePickerFragment

//Time Picker
public class TimePickerFragment : DialogFragment, 
                          TimePickerDialog.IOnTimeSetListener
{
    // TAG can be any string of your choice.
    public static readonly string TAG = "Y:" + typeof(TimePickerFragment).Name.ToUpper();

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

    public static TimePickerFragment NewInstance(Action<TimeSpan> onTimeSet)
    {
        TimePickerFragment frag = new TimePickerFragment();
        frag._timeSelectedHandler = onTimeSet;
        return frag;
    }

    public override Dialog OnCreateDialog(Bundle savedInstanceState)
    {
        Calendar c = Calendar.Instance;
        int hour = c.Get(CalendarField.HourOfDay);
        int minute = c.Get(CalendarField.Minute);
        bool is24HourView = true;
        TimePickerDialog dialog = new TimePickerDialog(Activity,
                                                       this,
                                                       hour,
                                                       minute,
                                                       is24HourView);
        return dialog;
    }

    public void OnTimeSet(TimePicker view, int hourOfDay, int minute)
    {
        //Do something when time chosen by user
        TimeSpan selectedTime = new TimeSpan(hourOfDay, minute, 00);
        Log.Debug(TAG, selectedTime.ToString());
        _timeSelectedHandler(selectedTime);
    }
}

显示片段

    private void StartTimeInput_Click(object sender, EventArgs e)
{
    TimePickerFragment frag = TimePickerFragment.NewInstance(delegate (TimeSpan time)
    {
        startTimeInput.Text = time.ToString();
    });
    frag.Show(FragmentManager, TimePickerFragment.TAG);
}

希望这有帮助！

Xamarin TimePicker片段对话框

2 个答案: