Xamarin TimePicker 片段对话框

Question

我正在使用 C# 开发 Xamarin Android 应用程序，我正在尝试实现一个 TimePicker 对话框，用户可以在其中选择给定时间，他们每天都会收到通知（或他选择的一周中的几天）。

我知道有一个 TimePickerDialog 控件已被弃用，我们现在需要使用片段对话框。如果有人能帮助我，我将不胜感激。

谢谢！

Answer 1

您最好的选择是扩展 DialogFragment 并从中创建您自己的 TimePickerFragment。 Android 甚至有关于该主题的完整文档：

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

（注意： 您必须转换相应的 Java -> C# 但这应该不是什么大问题）

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

这是项目中的示例代码：

class TimePickerFragment : DialogFragment
{
    public override Dialog OnCreateDialog(Bundle savedInstanceState)
    {
        return new TimePickerDialog(Activity, (sender, args) =>
        {
            //args contains new time
        }, DateTime.Now.Hour, DateTime.Now.Minute, true);
    }
}

Answer 3

这是我如何实现 TimePickerDialog 的示例

声明 EditText 控件（您可以只使用 TextView）

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

通过扩展 DialogFragment 创建一个 TimePickerFragment 并处理 OnCreate 和 OnTimeSet 方法

//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);
}

希望对您有所帮助！

Xamarin TimePicker 片段对话框

Xamarin TimePicker Fragment Dialog

c#

android

android-fragments

xamarin

android-timepicker