public static void ShowFatalAlert(this Android.App.Activity activity, string title, string message)
{
new AndroidX.AppCompat.App.AlertDialog.Builder(activity, Resource.Style.AlertDialogTheme)
.SetIcon(Resource.Mipmap.ic_launcher_round)
.SetCancelable(false)
.SetTitle(title)
.SetMessage(message)
.SetPositiveButton("退出", (o, e) => activity.FinishAndRemoveTask())
.Show();
}