问未处理的异常:MissingPluginException(没有在通道plugins.fltter.io/url_launcher_android上找到方法启动的实现)

EN

    void openWhatsapp(
    {required BuildContext context,
      required String text,
      required String number}) async {
    var whatsapp = number; //+92xx enter like this
    var whatsappURlAndroid =
      "whatsapp://send?phone=" + whatsapp + "&text=$text";
    var whatsappURLIos = "https://wa.me/$whatsapp?text=${Uri.tryParse(text)}";
    if (Platform.isIOS) {
    // for iOS phone only
    if (await canLaunchUrl(Uri.parse(whatsappURLIos))) {
      await launchUrl(Uri.parse(
        whatsappURLIos,
      ));
    } else {
      ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text("Whatsapp not installed")));
    }
    } else {
    // android , web
    if (await canLaunchUrl(Uri.parse(whatsappURlAndroid))) {
      await launchUrl(Uri.parse(whatsappURlAndroid));
    } else {
      ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text("Whatsapp not installed")));
    }
    }
    }