update main model

lib/pages/main/model/main_model.dart

@@ -15,16 +15,16 @@ class MainModel extends ChangeNotifier {
   final log = Logger('MainModel');
   List<BaseModel> models = [];
 
-  String messagingToken;
-  User user;
-  PackageInfo packageInfo;
+  String? messagingToken;
+  User? user;
+  PackageInfo? packageInfo;
 
   set setMessaginToken(token) {
     this.messagingToken = token;
     uploadMsgToken();
   }
 
-  Setting setting;
+  Setting? setting;
 
   bool isLoaded = false;
   bool isOnline = false;
@@ -42,23 +42,23 @@ class MainModel extends ChangeNotifier {
   }
 
   bool faqEditable() {
-    return this.user != null && this.user.hasSupport();
+    return this.user != null && this.user!.hasSupport();
   }
 
   bool rateEditable() {
-    return this.user != null && this.user.hasSupport();
+    return this.user != null && this.user!.hasSupport();
   }
 
   bool paymentMethodsEditable() {
-    return this.user != null && this.user.hasSupport();
+    return this.user != null && this.user!.hasSupport();
   }
 
   bool termEditable() {
-    return this.user != null && this.user.hasSupport();
+    return this.user != null && this.user!.hasSupport();
   }
 
   bool contactEditable() {
-    return this.user != null && this.user.hasSupport();
+    return this.user != null && this.user!.hasSupport();
   }
 
   bool isLogin() {
@@ -66,32 +66,31 @@ class MainModel extends ChangeNotifier {
   }
 
   bool isCustomer() {
-    return user != null && user.isCustomer();
+    return user != null && user!.isCustomer();
   }
 
   bool isSysAdmin() {
-    return this.user != null && this.user.hasSysAdmin();
+    return this.user != null && this.user!.hasSysAdmin();
   }
 
   bool isAdmin() {
-    return this.user != null && this.user.hasAdmin();
+    return this.user != null && this.user!.hasAdmin();
   }
 
   // userListener should never be closed
-  StreamSubscription<User> userListener;
+  StreamSubscription<User?>? userListener;
   _init() async {
     await _listenSetting();
-    this.isFirstLaunch = await SharedPref.isFirstLaunch();
-    this.isFirstLaunch = this.isFirstLaunch ?? true;
+    this.isFirstLaunch = await SharedPref.isFirstLaunch() ?? true;
     this.packageInfo = await PackageInfo.fromPlatform();
 
-    if (userListener != null) userListener.cancel();
+    if (userListener != null) userListener!.cancel();
     userListener =
         Services.instance.authService.getUserStream().listen((_user) {
       if (_user != null) {
         models.forEach((m) => m.initUser(_user));
         // call diffPrivileges if privilege changed or first time login
-        if (this.user == null || _user.diffPrivileges(this.user)) {
+        if (this.user == null || _user.diffPrivileges(this.user!)) {
           models.forEach((m) => m.privilegeChanged());
         }
         if (this.user == null) {
@@ -124,7 +123,7 @@ class MainModel extends ChangeNotifier {
 
   bool isSupport() {
     if (packageInfo == null || setting == null) return false;
-    return int.parse(packageInfo.buildNumber) >= setting.supportBuildNum;
+    return int.parse(packageInfo!.buildNumber) >= setting!.supportBuildNum;
   }
 
   Future<AuthResult> sendSms(String phoneNumber) {
@@ -137,14 +136,14 @@ class MainModel extends ChangeNotifier {
     return authResult;
   }
 
-  Future<void> uploadMsgToken() {
+  Future<void>? uploadMsgToken() {
     if (messagingToken == null || user == null) return null;
-    return Services.instance.userService.uploadMsgToken(messagingToken);
+    return Services.instance.userService.uploadMsgToken(messagingToken!);
   }
 
-  Future<void> removeMsgToken() {
+  Future<void>? removeMsgToken() {
     if (messagingToken == null || user == null) return null;
-    return Services.instance.userService.removeMsgToken(messagingToken);
+    return Services.instance.userService.removeMsgToken(messagingToken!);
   }
 
   Future<void> signout() async {