null safety

lib/pages/profile/profile_currency_edit.dart

@@ -24,7 +24,7 @@ class _ProfileCurrencyEditState extends State<ProfileCurrencyEdit> {
   void initState() {
     super.initState();
     MainModel mainModel = Provider.of<MainModel>(context, listen: false);
-    if (mainModel.user.preferCurrency == "MMK") {
+    if (mainModel.user!.preferCurrency == "MMK") {
       _currency = Currency.MMK;
     } else {
       _currency = Currency.USD;
@@ -77,7 +77,7 @@ class _ProfileCurrencyEditState extends State<ProfileCurrencyEdit> {
                   onChanged: (Currency? value) {
                     if(value != null)
                     setState(() {
-                      _currency = value!;
+                      _currency = value;
                     });
                   },
                 ),
@@ -96,7 +96,7 @@ class _ProfileCurrencyEditState extends State<ProfileCurrencyEdit> {
                   onChanged: (Currency? value) {
                     if(value != null)
                     setState(() {
-                      _currency = value!;
+                      _currency = value;
                     });
                   },
                 ),

lib/pages/profile/profile_edit.dart

@@ -24,7 +24,7 @@ class _ProfileEditState extends State<ProfileEdit> {
   void initState() {
     super.initState();
     MainModel mainModel = Provider.of<MainModel>(context, listen: false);
-    nameController.text = mainModel.user.name;
+    nameController.text = mainModel.user!.name ?? "";
   }
 
   @override

lib/pages/profile/profile_page.dart

@@ -18,6 +18,7 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
+import 'package:flutter_vector_icons/flutter_vector_icons.dart';
 
 import '../../helpers/theme.dart';
 
@@ -31,7 +32,7 @@ class Profile extends StatefulWidget {
 class _ProfileState extends State<Profile> {
   GlobalKey key = GlobalKey();
   bool _isLoading = false;
-   String? selectedLanguage ;
+  String? selectedLanguage;
   TextEditingController bizNameController = new TextEditingController();
 
   static final List<String> languagesList = Translation().supportedLanguages;
@@ -67,18 +68,19 @@ class _ProfileState extends State<Profile> {
         Provider.of<DeliveryAddressModel>(context);
 
     final namebox = DisplayText(
-      text: mainModel.user.name + " (${mainModel.user.status})",
+      text: "${mainModel.user!.name ?? ''}" +
+          " (${mainModel.user!.status ?? ''})",
       labelTextKey: "profile.name",
       iconData: Icons.person,
     );
     final currencyBox = DisplayText(
-      text: mainModel.user.preferCurrency,
+      text: mainModel.user!.preferCurrency ?? "",
       labelTextKey: "profile.currency",
-      iconData: FontAwesome5.money_bill_alt,
+      iconData: FontAwesome5Regular.money_bill_alt,
     );
 
     final phonenumberbox = DisplayText(
-      text: mainModel.user.phone,
+      text: mainModel.user!.phone ?? "",
       labelTextKey: "profile.phone",
       iconData: Icons.phone,
     );
@@ -86,15 +88,15 @@ class _ProfileState extends State<Profile> {
       children: [
         Expanded(
           child: DisplayText(
-            text: mainModel.user.fcsID,
+            text: mainModel.user!.fcsID ?? "",
             labelTextKey: "customer.fcs.id",
             icon: FcsIDIcon(),
           ),
         ),
         IconButton(
           icon: Icon(Icons.content_copy, color: Colors.grey),
-          onPressed: () => _copy(
-              getLocalString(context, "customer.fcs.id"), mainModel.user.fcsID),
+          onPressed: () => _copy(getLocalString(context, "customer.fcs.id"),
+              mainModel.user!.fcsID ?? ""),
         )
       ],
     );
@@ -103,7 +105,7 @@ class _ProfileState extends State<Profile> {
       children: [
         Expanded(
           child: DisplayText(
-            text: mainModel.setting.usaAddress,
+            text: mainModel.setting!.usaAddress ?? "",
             labelTextKey: "profile.usa.shipping.address",
             iconData: Icons.location_on,
           ),
@@ -112,7 +114,7 @@ class _ProfileState extends State<Profile> {
           icon: Icon(Icons.content_copy, color: Colors.grey),
           onPressed: () => _copy(
               getLocalString(context, "profile.usa.shipping.address"),
-              mainModel.setting.usaAddress),
+              mainModel.setting!.usaAddress ?? ""),
         )
       ],
     );
@@ -195,14 +197,14 @@ class _ProfileState extends State<Profile> {
   }
 
   Widget getPrivilegeBox(BuildContext context) {
-    User user = Provider.of<MainModel>(context, listen: false).user;
+    User? user = Provider.of<MainModel>(context, listen: false).user;
     List<Privilege> _privileges =
         Provider.of<StaffModel>(context, listen: false).privileges;
 
     if (user == null || user.isCustomer()) return Container();
     List<Privilege> privileges = [];
     user.privileges.forEach((e) {
-      var p = _privileges.firstWhere((p) => p.id == e, orElse: () => null);
+      var p = _privileges.firstWhere((p) => p.id == e);
       if (p != null) {
         privileges.add(p);
       }
@@ -270,7 +272,7 @@ class _ProfileState extends State<Profile> {
   }
 
   _showToast(String title) {
-    final ScaffoldState scaffold = key.currentState;
+    final ScaffoldState scaffold = key.currentState as ScaffoldState;
     scaffold.showSnackBar(
       SnackBar(
         content: Text('copied "$title" data to clipboard'),