使用Materialpickerrender一次拾取和取消按钮标题在Xamarin窗体中显示顶部

<Button Text="选择" Clicked="OnButtonClicked" />

private async void OnButtonClicked(object sender, EventArgs e)
{
    var result = await MaterialPickerRender.PickAsync("标题", "取消");
    if (result != null)
    {
        // 处理选择的结果
    }
}

using Xamarin.Forms.PlatformConfiguration.AndroidSpecific;
using Xamarin.Forms.PlatformConfiguration;
using Xamarin.Forms.PlatformConfiguration.AndroidSpecific.AppCompat;

[assembly: ExportRenderer(typeof(Button), typeof(MaterialPickerRender))]
namespace YourNamespace
{
    public class MaterialPickerRender : ButtonRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Button> e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {
                Control.On<Xamarin.Forms.PlatformConfiguration.Android>().SetUseMaterialButtonStyle(true);
                Control.On<Xamarin.Forms.PlatformConfiguration.Android>().SetMaterialButtonStyle(MaterialButtonStyle.Outlined);
            }
        }

        public static Task<string> PickAsync(string title, string cancel)
        {
            // 实现一次拾取和取消按钮标题显示在顶部的逻辑
            // 返回选择的结果
        }
    }
}