final

lib/pages/buy_service.dart

@@ -19,10 +19,10 @@ import '../widgets/mobile/mobile_renew_license.dart';
 class BuyService extends StatefulWidget {
   final int gid;
   final String serviceName;
-  final String domain;
-  final int sid;
+  final String? domain;
+  final int? sid;
 
-  const BuyService(this.gid, this.serviceName, {Key key, this.domain, this.sid = 0}) :
+  const BuyService(this.gid, this.serviceName, {Key? key, this.domain, this.sid = 0}) :
       super(key: key);
 
   @override
@@ -30,7 +30,7 @@ class BuyService extends StatefulWidget {
 }
 
 class BuyServiceState extends State<BuyService> {
-  Map<String, dynamic> data;
+  Map<String, dynamic>? data;
 
   @override
   Widget build(BuildContext context) {
@@ -48,13 +48,10 @@ class BuyServiceState extends State<BuyService> {
       );
     }
 
-    return ResponsiveBuilder(
-      builder: (context, sizingInformation) =>
-          ScreenTypeLayout(
-            mobile: MobileBuyService(data),
-            tablet: DesktopBuyService(data),
-            desktop: DesktopBuyService(data),
-          ),
+    return ScreenTypeLayout.builder(
+      mobile: (context) => MobileBuyService(data),
+      tablet: (context) => DesktopBuyService(data),
+      desktop: (context) => DesktopBuyService(data),
     );
   }
 
@@ -73,7 +70,7 @@ class BuyServiceState extends State<BuyService> {
       }
     ).then((value) {
       data = value;
-      data['domain'] = widget.domain;
+      data?['domain'] = widget.domain;
       print('data: $data');
       setState(() {});
     }).onError((error, stackTrace) {