如何在Xamarin表单中截获Android中点击的硬件栏返回按钮？

using Android.App;
using Android.Content.PM;
using Android.OS;
using Xamarin.Forms.Platform.Android;

namespace YourAppName.Droid
{
    [Activity(Label = "YourAppName", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            Xamarin.Forms.Forms.Init(this, savedInstanceState);
            LoadApplication(new App());
        }

        public override void OnBackPressed()
        {
            // 在这里处理返回按钮的点击事件
            // 可以执行你想要的操作，例如返回上一页或者退出应用

            base.OnBackPressed();
        }
    }
}