Android MonoDroid Xamarin TimePickerDialog 访问 mMinuteSpinner NumberPicker

Question

我正在尝试将 TimePickerDialog 设置为 10 分钟的间隔，我已经看到了各种看起来应该可以工作的解决方案，但是最优雅的解决方案似乎是从 TimePickerDialog 派生，然后将 NumberPicker 属性覆盖为 00、10 , 20 ... 40 而不是 00, 01, 02 ... 59。

Java 中的解决方案似乎是在派生类的构造函数中获取 NumberPicker 控件并重置它的所有值以显示您想要的内容。 01.sunlit Set TimePickerDialog to use 15 minute intervals

可以在这里找到解决方案

我已尝试在 Xamarin 中实现此解决方案，但无法访问数字选择器对象。

你能告诉我如何在派生类的构造函数中访问这个对象吗？

Answer 1

所以我设法让它像这样工作：

public class TimePickerDialogIntervals : TimePickerDialog
{
    public const int TimePickerInterval = 10;
    private bool _ignoreEvent = false;

    public TimePickerDialogIntervals(Context context, EventHandler<TimePickerDialog.TimeSetEventArgs> callBack, int hourOfDay, int minute, bool is24HourView)
            : base(context, (sender, e) => {
                callBack (sender, new TimePickerDialog.TimeSetEventArgs (e.HourOfDay, e.Minute * TimePickerInterval));
            }, hourOfDay, minute/TimePickerInterval, is24HourView)
    {
    }

    protected TimePickerDialogIntervals(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
    {
    }

    public override void SetView(View view)
    {
        SetupMinutePicker (view);
        base.SetView(view);
    }

    void SetupMinutePicker (View view)
    {
        var numberPicker = FindMinuteNumberPicker (view as ViewGroup);
        if (numberPicker != null) {
            numberPicker.MinValue = 0;
            numberPicker.MaxValue = 5;
            numberPicker.SetDisplayedValues (new String[] { "00", "10", "20", "30", "40", "50" });
        }
    }

    protected override void OnCreate (Android.OS.Bundle savedInstanceState)
    {
        base.OnCreate (savedInstanceState);
        GetButton((int)DialogButtonType.Negative).Visibility = Android.Views.ViewStates.Gone;
        this.SetCanceledOnTouchOutside (false);

    }

    private NumberPicker FindMinuteNumberPicker(ViewGroup viewGroup)
    {
        for (var i = 0; i < viewGroup.ChildCount; i++)
        {
            var child = viewGroup.GetChildAt(i);
            var numberPicker = child as NumberPicker;
            if (numberPicker != null)
            {
                if (numberPicker.MaxValue == 59)
                {
                    return numberPicker;
                }
            }

            var childViewGroup = child as ViewGroup;
            if (childViewGroup != null)
            {
                var childResult = FindMinuteNumberPicker (childViewGroup);
                if(childResult !=null)
                    return childResult;
            }
        }

        return null;
    }
}