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(); }