Hey there, let's figure out how to get your DatePicker to only display the spinner selector (and hide the calendar pop-up) on API 22 in Xamarin.Forms! Since most existing solutions target API 24+, we'll need a custom Android renderer specifically tailored for this older Android version.

Step 1: Create a Custom DatePicker in Your Shared Project #

First, we'll define a custom DatePicker control in your shared code—this lets us target it with our Android renderer later:

using Xamarin.Forms;

namespace YourAppNamespace
{
    // Just a wrapper around the default DatePicker to apply our custom rendering
    public class SpinnerOnlyDatePicker : DatePicker
    {
    }
}

Step 2: Implement the Android Custom Renderer #

In your Android project, add a renderer that modifies the native DatePickerDialog to hide the calendar view and force spinner mode:

using Android.App;
using Android.Content;
using Android.Widget;
using YourAppNamespace;
using YourAppNamespace.Droid;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(SpinnerOnlyDatePicker), typeof(SpinnerOnlyDatePickerRenderer))]
namespace YourAppNamespace.Droid
{
    public class SpinnerOnlyDatePickerRenderer : DatePickerRenderer
    {
        public SpinnerOnlyDatePickerRenderer(Context context) : base(context)
        {
        }

        protected override DatePickerDialog CreateDatePickerDialog(int year, int month, int day)
        {
            var dialog = base.CreateDatePickerDialog(year, month, day);
            
            // Get the native DatePicker component from the dialog
            var nativeDatePicker = dialog.FindViewById<DatePicker>(Resource.Id.datePicker);
            
            if (nativeDatePicker != null)
            {
                // Hide the calendar view and show only the spinners
                nativeDatePicker.CalendarViewShown = false;
                nativeDatePicker.SpinnersShown = true;
            }

            return dialog;
        }
    }
}

Step 3: Use the Custom Control in Your XAML #

Replace your existing DatePicker with our new SpinnerOnlyDatePicker in your XAML files:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:YourAppNamespace"
             x:Class="YourAppNamespace.MainPage">

    <StackLayout Padding="20">
        <!-- Use our custom spinner-only date picker -->
        <local:SpinnerOnlyDatePicker 
            Title="Select Date"
            Format="MM/dd/yyyy" />
    </StackLayout>
</ContentPage>

Key Notes #

• For API 22, the native Android DatePicker has direct properties (CalendarViewShown and SpinnersShown) to toggle which parts are displayed—this is why this approach works where API 24+ solutions (which use DatePickerDialog.ToggleCalendarView()) don't.
• Make sure your Android project's target framework includes API 22 (you can check this in your project properties under Android Options).
• If you still see the calendar, double-check that you're using the custom SpinnerOnlyDatePicker instead of the default Xamarin.Forms DatePicker in all places.

内容的提问来源于stack exchange，提问作者tlauer