Merge remote-tracking branch 'upstream/master'

lib/data/provider/auth_fb.dart

@@ -9,7 +9,7 @@ import 'package:fcs/domain/entities/user.dart';
 import 'package:fcs/domain/exceiptions/signin_exception.dart';
 import 'package:fcs/helpers/api_helper.dart';
 import 'package:fcs/helpers/firebase_helper.dart';
-import 'package:firebase_auth/firebase_auth.dart';
+import 'package:firebase_auth/firebase_auth.dart' as fb;
 import 'package:logging/logging.dart';
 
 class AuthFb {
@@ -18,17 +18,17 @@ class AuthFb {
   static final AuthFb instance = AuthFb._();
   AuthFb._();
 
-  StreamController<User> controller;
+  late StreamController<User?> controller;
-  static final FirebaseAuth _fb = FirebaseAuth.instance;
+  static final fb.FirebaseAuth _fb = fb.FirebaseAuth.instance;
-  static String _verificationId;
+  static String _verificationId = '';
 
   Future<fcs.AuthResult> sendSmsCodeToPhoneNumber(String phoneNumber) {
     Completer<fcs.AuthResult> completer = Completer();
     bool codeSentCompleted = false;
 
-    final PhoneVerificationCompleted verificationCompleted =
+    final fb.PhoneVerificationCompleted verificationCompleted =
-        (AuthCredential credential) async {
+        (fb.AuthCredential credential) async {
-      AuthResult _authResult;
+      fb.UserCredential _authResult;
       try {
         _authResult = await _fb.signInWithCredential(credential);
         print("PhoneVerificationCompleted :$_authResult");
@@ -48,23 +48,23 @@ class AuthFb {
           'Inside _sendCodeToPhoneNumber: signInWithPhoneNumber auto succeeded: ${_authResult.user}');
     };
 
-    final PhoneVerificationFailed verificationFailed =
+    final fb.PhoneVerificationFailed verificationFailed =
-        (AuthException authException) async {
+        (fb.FirebaseAuthException authException) async {
       print(
           'Phone number verification failed. Code: ${authException.code}. Message: ${authException.message}');
       completer.completeError(SigninException(
           "Phone number verification failed:${authException.message}"));
     };
 
-    final PhoneCodeSent codeSent =
+    final fb.PhoneCodeSent codeSent =
-        (String verificationId, [int forceResendingToken]) async {
+        (String verificationId, [int? forceResendingToken]) async {
       _verificationId = verificationId;
       print("codeSent  " + phoneNumber);
       codeSentCompleted = true;
       completer.complete(fcs.AuthResult(authStatus: AuthStatus.SMS_SENT));
     };
 
-    final PhoneCodeAutoRetrievalTimeout codeAutoRetrievalTimeout =
+    final fb.PhoneCodeAutoRetrievalTimeout codeAutoRetrievalTimeout =
         (String verificationId) {
       print("codeAutoRetrievalTimeout $verificationId ");
 
@@ -89,11 +89,11 @@ class AuthFb {
 
   Future<fcs.AuthResult> signInWithPhoneNumber(String smsCode) async {
     try {
-      final AuthCredential credential = PhoneAuthProvider.getCredential(
+      final fb.AuthCredential credential = fb.PhoneAuthProvider.credential(
-        verificationId: _verificationId,
+          verificationId: _verificationId, smsCode: smsCode);
-        smsCode: smsCode,
+
-      );
+      fb.UserCredential _authResult =
-      AuthResult _authResult = await _fb.signInWithCredential(credential);
+          await _fb.signInWithCredential(credential);
       if (_authResult == null) {
         throw SigninException("Sigin error!");
       }
@@ -105,19 +105,21 @@ class AuthFb {
   }
 
   Future<void> signout() async {
-    if (userListener != null) await userListener.cancel();
+    if (userListener != null) await userListener!.cancel();
     return _fb.signOut();
   }
 
   Future<void> _addUserToStream({bool refreshIdToken = false}) async {
-    FirebaseUser firebaseUser = await _fb.currentUser();
+    fb.User? firebaseUser = _fb.currentUser;
     if (firebaseUser == null) return null;
-    Map claims = await getClaims(refreshIdToken: refreshIdToken);
+    Map<dynamic, dynamic>? claims =
+        await getClaims(refreshIdToken: refreshIdToken);
 
     log.info("Claims:$claims");
+    if (claims == null) return;
 
     String cid = claims["cid"];
-    User user;
+    User? user;
     if (cid != null && cid != "") {
       user = await _getUserFromFirestore(cid);
     }
@@ -136,20 +138,20 @@ class AuthFb {
     controller.add(user);
   }
 
-  Future<User> _getUserFromFirestore(String userID) async {
+  Future<User?> _getUserFromFirestore(String userID) async {
-    DocumentSnapshot snap = await Firestore.instance
+    DocumentSnapshot snap = await FirebaseFirestore.instance
         .collection(user_collection)
-        .document(userID)
+        .doc(userID)
         .get();
     if (snap.exists) {
-      User user = User.fromMap(snap.data, snap.documentID);
+      User user = User.fromMap(snap.data() as Map<String, dynamic>, snap.id);
       return user;
     }
     return null;
   }
 
   Future<bool> isLogin() async {
-    final FirebaseUser firebaseUser = await _fb.currentUser();
+    final fb.User? firebaseUser = _fb.currentUser;
     return Future.value(firebaseUser != null);
   }
 
@@ -193,48 +195,50 @@ class AuthFb {
   }
 
   Stream<Setting> settings() async* {
-    Stream<DocumentSnapshot> snapshot = Firestore.instance
+    Stream<DocumentSnapshot> snapshot = FirebaseFirestore.instance
         .collection(config_collection)
-        .document(setting_doc_id)
+        .doc(setting_doc_id)
         .snapshots();
 
     await for (var snap in snapshot) {
-      Setting setting = Setting.fromMap(snap.data);
+      Setting setting = Setting.fromMap(snap.data() as Map<String, dynamic>);
       yield setting;
     }
   }
 
-  Future<String> _getCurrentUserID() async {
+  Future<String?> _getCurrentUserID() async {
-    FirebaseUser firebaseUser = await _fb.currentUser();
+    fb.User? firebaseUser = _fb.currentUser;
     if (firebaseUser == null) return null;
-    Map claims = await getClaims();
+    Map? claims = await getClaims();
+    if (claims == null) return null;
     String cid = claims["cid"];
     return cid;
   }
 
   Future<void> _startUserListener() async {
-    if (userListener != null) userListener.cancel();
+    if (userListener != null) userListener!.cancel();
-    String _userID = await _getCurrentUserID();
+    String? _userID = await _getCurrentUserID();
     if (_userID == null) {
       return;
     }
 
-    Stream<DocumentSnapshot> snapshot = Firestore.instance
+    Stream<DocumentSnapshot> snapshot = FirebaseFirestore.instance
         .collection(user_collection)
-        .document(_userID)
+        .doc(_userID)
         .snapshots();
     userListener = snapshot.listen((snap) async {
-      User user = User.fromMap(snap.data, snap.documentID);
+      User user = User.fromMap(snap.data() as Map<String, dynamic>, snap.id);
 
-      FirebaseUser firebaseUser = await _fb.currentUser();
+      fb.User? firebaseUser = _fb.currentUser;
       if (firebaseUser == null) {
-        userListener.cancel();
+        userListener?.cancel();
         return;
       }
       try {
         // get privilege from claim
-        IdTokenResult idToken = await firebaseUser.getIdToken(refresh: true);
+        fb.IdTokenResult idToken = await firebaseUser.getIdTokenResult(true);
-        String privileges = idToken.claims["pr"];
+
+        String privileges = idToken.claims?["pr"] ?? '';
         if (privileges != null && privileges != "") {
           user.privileges = privileges.split(":").toList();
         }
@@ -245,13 +249,13 @@ class AuthFb {
     });
   }
 
-  StreamSubscription<DocumentSnapshot> userListener;
+  StreamSubscription<DocumentSnapshot>? userListener;
-  Stream<User> user() {
+  Stream<User?> user() {
     // ignore: close_sinks
-    StreamSubscription<FirebaseUser> authListener;
+    StreamSubscription<fb.User?>? authListener;
 
     Future<void> _start() async {
-      authListener = _fb.onAuthStateChanged.listen((firebaseUser) async {
+      authListener = _fb.authStateChanges().listen((firebaseUser) {
         if (firebaseUser == null) {
           controller.add(null);
         } else {
@@ -263,10 +267,10 @@ class AuthFb {
 
     void _stop() {
       if (userListener != null) {
-        userListener.cancel();
+        userListener!.cancel();
       }
       if (authListener != null) {
-        authListener.cancel();
+        authListener!.cancel();
       }
     }
 

lib/data/provider/carton_data_provider.dart

@@ -1,5 +1,4 @@
 import 'dart:async';
-import 'dart:convert';
 
 import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:fcs/domain/constants.dart';
@@ -36,7 +35,7 @@ class CartonDataProvider {
   }
 
   Future<List<Carton>> searchCarton(String term) async {
-    if (term == null || term == '') return List();
+    if (term == null || term == '') return [];
 
     // var bytes = utf8.encode(term);
     // var base64Str = base64.encode(bytes);
@@ -45,7 +44,7 @@ class CartonDataProvider {
 
     try {
       String path = "/$cartons_collection";
-      var querySnap = await Firestore.instance
+      var querySnap = await FirebaseFirestore.instance
           .collection(path)
           .where("carton_number", isEqualTo: term)
           .where("carton_type",
@@ -53,13 +52,11 @@ class CartonDataProvider {
           .where("status", isEqualTo: carton_packed_status)
           .where("is_deleted", isEqualTo: false)
           .orderBy("user_name")
-          .getDocuments();
+          .get();
-      return querySnap.documents
+      return querySnap.docs.map((e) => Carton.fromMap(e.data(), e.id)).toList();
-          .map((e) => Carton.fromMap(e.data, e.documentID))
-          .toList();
     } catch (e) {
       log.warning("carton error:" + e.toString());
-      return null;
+      return [];
     }
   }
 }

lib/data/provider/package_data_provider.dart

@@ -56,8 +56,8 @@ class PackageDataProvider {
         token: await getToken());
   }
 
-  Future<List<Package>> ftsSearchPackage(String term) async {
+  Future<List<Package>?> ftsSearchPackage(String term) async {
-    if (term == null || term == '') return List();
+    if (term == null || term == '') return [];
 
     var bytes = utf8.encode(term);
     var base64Str = base64.encode(bytes);
@@ -72,7 +72,7 @@ class PackageDataProvider {
           "/api/fts/$packages_collection/$escapePackage/$limit", "GET",
           url: Config.instance.reportURL, token: await getToken());
 
-      if (data == null) return List();
+      if (data == null) return [];
 
       data.forEach((p) {
         var package = Package.fromJson(p);
@@ -86,7 +86,7 @@ class PackageDataProvider {
   }
 
   Future<List<Package>> searchPackage(String term) async {
-    if (term == null || term == '') return List();
+    if (term == null || term == '') return [];
 
     List<Package> packages = [];
 

lib/data/provider/rate_data_provider.dart

@@ -16,33 +16,33 @@ class RateDataProvider {
   static final RateDataProvider instance = RateDataProvider._();
   RateDataProvider._();
 
-  StreamController<Rate> controller;
+  late StreamController<Rate> controller;
   static Rate _rate = Rate();
 
   Stream<Rate> _rateStream() async* {
-    Stream<DocumentSnapshot> snapshot = Firestore.instance
+    Stream<DocumentSnapshot> snapshot = FirebaseFirestore.instance
         .collection(config_collection)
-        .document(rate_doc_id)
+        .doc(rate_doc_id)
         .snapshots();
     await for (var snap in snapshot) {
-      Rate rate = Rate.fromMap(snap.data);
+      Rate rate = Rate.fromMap(snap.data() as Map<String, dynamic>);
       yield rate;
     }
   }
 
   Stream<List<CargoType>> _cargoTypeStream() async* {
     List<CargoType> cargoTypes = [];
-    Stream<QuerySnapshot> snapshots = Firestore.instance
+    Stream<QuerySnapshot> snapshots = FirebaseFirestore.instance
         .collection(config_collection)
-        .document(rate_doc_id)
+        .doc(rate_doc_id)
         .collection(cargo_types_collection)
         .where("custom_duty", isEqualTo: false)
         .snapshots();
 
     await for (var snaps in snapshots) {
       cargoTypes = [];
-      cargoTypes = snaps.documents.map((snap) {
+      cargoTypes = snaps.docs.map((snap) {
-        return CargoType.fromMap(snap.data, snap.documentID);
+        return CargoType.fromMap(snap.data() as Map<String, dynamic>, snap.id);
       }).toList();
 
       yield cargoTypes;
@@ -51,17 +51,17 @@ class RateDataProvider {
 
   Stream<List<CargoType>> _customDutiesStream() async* {
     List<CargoType> customDuries = [];
-    Stream<QuerySnapshot> snapshots = Firestore.instance
+    Stream<QuerySnapshot> snapshots = FirebaseFirestore.instance
         .collection(config_collection)
-        .document(rate_doc_id)
+        .doc(rate_doc_id)
         .collection(cargo_types_collection)
         .where("custom_duty", isEqualTo: true)
         .snapshots();
 
     await for (var snaps in snapshots) {
       customDuries = [];
-      customDuries = snaps.documents.map((snap) {
+      customDuries = snaps.docs.map((snap) {
-        return CargoType.fromMap(snap.data, snap.documentID);
+        return CargoType.fromMap(snap.data() as Map<String, dynamic>, snap.id);
       }).toList();
       yield customDuries;
     }
@@ -69,25 +69,26 @@ class RateDataProvider {
 
   Stream<List<DiscountByWeight>> _discountByWeightStream() async* {
     List<DiscountByWeight> discountByWeight = [];
-    Stream<QuerySnapshot> snapshots = Firestore.instance
+    Stream<QuerySnapshot> snapshots = FirebaseFirestore.instance
         .collection(config_collection)
-        .document(rate_doc_id)
+        .doc(rate_doc_id)
         .collection(discounts_by_weights_collection)
         .snapshots();
 
     await for (var snaps in snapshots) {
       discountByWeight = [];
-      discountByWeight = snaps.documents.map((snap) {
+      discountByWeight = snaps.docs.map((snap) {
-        return DiscountByWeight.fromMap(snap.data, snap.documentID);
+        return DiscountByWeight.fromMap(
+            snap.data() as Map<String, dynamic>, snap.id);
       }).toList();
       yield discountByWeight;
     }
   }
 
-  StreamSubscription<Rate> rateListener;
+  late StreamSubscription<Rate> rateListener;
-  StreamSubscription<List<CargoType>> cargoListener;
+  late StreamSubscription<List<CargoType>> cargoListener;
-  StreamSubscription<List<CargoType>> customListener;
+  late StreamSubscription<List<CargoType>> customListener;
-  StreamSubscription<List<DiscountByWeight>> discountListener;
+  late StreamSubscription<List<DiscountByWeight>> discountListener;
   Stream<Rate> rate() {
     Future<void> _start() async {
       rateListener = _rateStream().listen((rate) {

lib/data/provider/user_data_provider.dart

@@ -37,23 +37,23 @@ class UserDataProvider {
         payload: {"token": token}, token: await getToken());
   }
 
-  Future<User> findUser(String phoneNumber) async {
+  Future<User?> findUser(String phoneNumber) async {
-    QuerySnapshot querySnap = await Firestore.instance
+    QuerySnapshot querySnap = await FirebaseFirestore.instance
         .collection(user_collection)
         .where("phone_number", isEqualTo: phoneNumber)
         .limit(1)
-        .getDocuments();
+        .get();
 
-    if (querySnap.documents.length > 0) {
+    if (querySnap.docs.length > 0) {
-      var snap = querySnap.documents.first;
+      var snap = querySnap.docs.first;
-      User user = User.fromMap(snap.data, snap.documentID);
+      User user = User.fromMap(snap.data() as Map<String, dynamic>, snap.id);
       return user;
     }
     return null;
   }
 
   Future<List<User>> searchUser(String term) async {
-    if (term == null || term == '') return List();
+    if (term == null || term == '') return [];
 
     var bytes = utf8.encode(term);
     var base64Str = base64.encode(bytes);
@@ -68,7 +68,7 @@ class UserDataProvider {
           "/api/fts/$user_collection/$escapeBuyer/$limit", "GET",
           url: Config.instance.reportURL, token: await getToken());
 
-      if (data == null) return List();
+      if (data == null) return [];
 
       data.forEach((buyer) {
         var user = User.fromJson(buyer);
@@ -76,7 +76,7 @@ class UserDataProvider {
       });
     } catch (e) {
       log.warning("buyer error:" + e.toString());
-      return null;
+      // return null;
     }
     return users;
   }

lib/data/services/auth_imp.dart

@@ -3,17 +3,16 @@ import 'package:fcs/domain/entities/auth_result.dart';
 import 'package:fcs/domain/entities/connectivity.dart';
 import 'package:fcs/domain/entities/setting.dart';
 import 'package:fcs/domain/entities/user.dart';
-import 'package:flutter/material.dart';
 
 import 'auth_service.dart';
 
 class AuthServiceImp implements AuthService {
   AuthServiceImp({
-    @required this.authFb,
+    required this.authFb,
-    @required this.connectivity,
+    required this.connectivity,
   });
 
-  final Connectivity connectivity;
+  final Connectivity? connectivity;
   final AuthFb authFb;
 
   @override
@@ -32,7 +31,7 @@ class AuthServiceImp implements AuthService {
   }
 
   @override
-  Stream<User> getUserStream() {
+  Stream<User?> getUserStream() {
     return authFb.user();
   }
 

lib/data/services/auth_service.dart

@@ -11,6 +11,6 @@ abstract class AuthService {
   Future<void> updateProfileName(String newUserName);
   Future<void> updatePreferredCurrency(String currency);
   Future<bool> hasInvite();
-  Stream<User> getUserStream();
+  Stream<User?> getUserStream();
   Stream<Setting> getSetting();
 }

lib/data/services/carton_imp.dart

@@ -1,17 +1,16 @@
 import 'package:fcs/data/provider/carton_data_provider.dart';
 import 'package:fcs/domain/entities/carton.dart';
 import 'package:fcs/domain/entities/connectivity.dart';
-import 'package:flutter/material.dart';
 
 import 'carton_service.dart';
 
 class CartonServiceImp implements CartonService {
   CartonServiceImp({
-    @required this.cartonDataProvider,
+    required this.cartonDataProvider,
-    @required this.connectivity,
+    required this.connectivity,
   });
 
-  final Connectivity connectivity;
+  final Connectivity? connectivity;
   final CartonDataProvider cartonDataProvider;
 
   @override

lib/data/services/common_imp.dart

@@ -2,13 +2,12 @@ import 'package:fcs/data/provider/common_data_provider.dart';
 import 'package:fcs/domain/entities/discount.dart';
 import 'package:fcs/domain/entities/payment_method.dart';
 import 'package:fcs/domain/vo/message.dart';
-import 'package:flutter/material.dart';
 
 import 'common_service.dart';
 
 class CommonServiceImp implements CommonService {
   CommonServiceImp({
-    @required this.commonDataProvider,
+    required this.commonDataProvider,
   });
 
   final CommonDataProvider commonDataProvider;

lib/data/services/delivery_address_imp.dart

@@ -1,17 +1,16 @@
 import 'package:fcs/data/provider/delivery_address_data_provider.dart';
 import 'package:fcs/domain/entities/connectivity.dart';
 import 'package:fcs/domain/vo/delivery_address.dart';
-import 'package:flutter/material.dart';
 
 import 'delivery_address_service.dart';
 
 class DeliveryAddressImp implements DeliveryAddressService {
   DeliveryAddressImp({
-    @required this.connectivity,
+    required this.connectivity,
-    @required this.deliveryAddressDataProvider,
+    required this.deliveryAddressDataProvider,
   });
 
-  final Connectivity connectivity;
+  final Connectivity? connectivity;
   final DeliveryAddressDataProvider deliveryAddressDataProvider;
 
   @override

lib/data/services/fcs_shipment_imp.dart

@@ -1,17 +1,16 @@
 import 'package:fcs/data/provider/fcs_shipment_data_provider.dart';
 import 'package:fcs/domain/entities/connectivity.dart';
 import 'package:fcs/domain/entities/fcs_shipment.dart';
-import 'package:flutter/material.dart';
 
 import 'fcs_shipment_service.dart';
 
 class FcsShipmentServiceImp implements FcsShipmentService {
   FcsShipmentServiceImp({
-    @required this.connectivity,
+    required this.connectivity,
-    @required this.shipmentDataProvider,
+    required this.shipmentDataProvider,
   });
 
-  final Connectivity connectivity;
+  final Connectivity? connectivity;
   final FcsShipmentDataProvider shipmentDataProvider;
 
   @override

lib/data/services/invoice_imp.dart

@@ -1,21 +1,17 @@
 import 'package:fcs/data/provider/invoice_data_provider.dart';
-import 'package:fcs/data/provider/shipment_data_provider.dart';
-import 'package:fcs/data/services/shipment_service.dart';
 import 'package:fcs/domain/entities/connectivity.dart';
 import 'package:fcs/domain/entities/invoice.dart';
 import 'package:fcs/domain/entities/payment.dart';
-import 'package:fcs/domain/entities/shipment.dart';
-import 'package:flutter/material.dart';
 
 import 'invoice_service.dart';
 
 class InvoiceServiceImp implements InvoiceService {
   InvoiceServiceImp({
-    @required this.invoiceDataProvider,
+    required this.invoiceDataProvider,
-    @required this.connectivity,
+    required this.connectivity,
   });
 
-  final Connectivity connectivity;
+  final Connectivity? connectivity;
   final InvoiceDataProvider invoiceDataProvider;
 
   @override

lib/data/services/package_imp.dart

@@ -1,17 +1,16 @@
 import 'package:fcs/data/provider/package_data_provider.dart';
 import 'package:fcs/domain/entities/connectivity.dart';
 import 'package:fcs/domain/entities/package.dart';
-import 'package:flutter/material.dart';
 
 import 'package_service.dart';
 
 class PackageServiceImp implements PackageService {
   PackageServiceImp({
-    @required this.connectivity,
+    required this.connectivity,
-    @required this.packageDataProvider,
+    required this.packageDataProvider,
   });
 
-  final Connectivity connectivity;
+  final Connectivity? connectivity;
   final PackageDataProvider packageDataProvider;
 
   @override
@@ -30,7 +29,7 @@ class PackageServiceImp implements PackageService {
   }
 
   @override
-  Future<List<Package>> ftsSearchPackage(String term) {
+  Future<List<Package>?> ftsSearchPackage(String term) {
     return packageDataProvider.ftsSearchPackage(term);
   }
 

lib/data/services/package_service.dart

@@ -7,7 +7,7 @@ abstract class PackageService {
   Future<void> deleteReceiving(Package package);
   Future<void> updateProcessing(Package package);
   Future<void> deleteProcessing(Package package);
-  Future<List<Package>> ftsSearchPackage(String term);
+  Future<List<Package>?> ftsSearchPackage(String term);
   Future<List<Package>> searchPackage(String term);
   Future<void> changeDeliveryAddress(String packageID, String deliveryID);
   Future<void> packageReturn(String packageID);

lib/data/services/rate_imp.dart

@@ -4,17 +4,16 @@ import 'package:fcs/domain/entities/connectivity.dart';
 import 'package:fcs/domain/entities/discount_by_weight.dart';
 import 'package:fcs/domain/entities/custom_duty.dart';
 import 'package:fcs/domain/entities/rate.dart';
-import 'package:flutter/material.dart';
 
 import 'rate_service.dart';
 
 class RateServiceImp implements RateService {
   RateServiceImp({
-    @required this.rateDataProvider,
+    required this.rateDataProvider,
-    @required this.connectivity,
+    required this.connectivity,
   });
 
-  final Connectivity connectivity;
+  final Connectivity? connectivity;
   final RateDataProvider rateDataProvider;
 
   @override

lib/data/services/services.dart

@@ -35,17 +35,18 @@ import 'user_service.dart';
 class Services {
   static final Services instance = Services._();
 
-  AuthService _authService;
+  late AuthService _authService;
-  UserService _userService;
+  late UserService _userService;
-  PackageService _packageService;
+  late PackageService _packageService;
-  MessagingService _messagingService;
+  late MessagingService _messagingService;
-  CommonService _commonService;
+  late CommonService _commonService;
-  FcsShipmentService _fcsShipmentService;
+  late FcsShipmentService _fcsShipmentService;
-  DeliveryAddressService _deliveryAddressService;
+  late DeliveryAddressService _deliveryAddressService;
-  RateService _rateService;
+  late RateService _rateService;
-  ShipmentService _shipmentService;
+  late ShipmentService _shipmentService;
-  CartonService _cartonService;
+  late CartonService _cartonService;
-  InvoiceService _invoiceService;
+  late InvoiceService _invoiceService;
+
   Services._() {
     _authService = AuthServiceImp(
       authFb: AuthFb.instance,

lib/data/services/shipment_imp.dart

@@ -2,15 +2,14 @@ import 'package:fcs/data/provider/shipment_data_provider.dart';
 import 'package:fcs/data/services/shipment_service.dart';
 import 'package:fcs/domain/entities/connectivity.dart';
 import 'package:fcs/domain/entities/shipment.dart';
-import 'package:flutter/material.dart';
 
 class ShipmentServiceImp implements ShipmentService {
   ShipmentServiceImp({
-    @required this.shipmentDataProvider,
+    required this.shipmentDataProvider,
-    @required this.connectivity,
+    required this.connectivity,
   });
 
-  final Connectivity connectivity;
+  final Connectivity? connectivity;
   final ShipmentDataProvider shipmentDataProvider;
 
   @override

lib/data/services/user_imp.dart

@@ -1,17 +1,16 @@
 import 'package:fcs/data/provider/user_data_provider.dart';
 import 'package:fcs/domain/entities/connectivity.dart';
 import 'package:fcs/domain/entities/user.dart';
-import 'package:flutter/material.dart';
 
 import 'user_service.dart';
 
 class UserServiceImp implements UserService {
   UserServiceImp({
-    @required this.connectivity,
+    required this.connectivity,
-    @required this.userDataProvider,
+    required this.userDataProvider,
   });
 
-  final Connectivity connectivity;
+  final Connectivity? connectivity;
   final UserDataProvider userDataProvider;
 
   @override
@@ -30,7 +29,7 @@ class UserServiceImp implements UserService {
   }
 
   @override
-  Future<User> findUser(String phoneNumber) {
+  Future<User?> findUser(String phoneNumber) {
     return userDataProvider.findUser(phoneNumber);
   }
 

lib/data/services/user_service.dart

@@ -4,7 +4,7 @@ abstract class UserService {
   Future<void> inviteUser(String userName, String phoneNumber);
   Future<void> deleteInvite(String phoneNumber);
   Future<void> acceptRequest(String userID);
-  Future<User> findUser(String phoneNumber);
+  Future<User?> findUser(String phoneNumber);
   Future<List<User>> searchUser(String term);
   Future<void> uploadMsgToken(String token);
   Future<void> removeMsgToken(String token);

lib/domain/entities/auth_result.dart

@@ -1,9 +1,9 @@
 import 'auth_status.dart';
 
 class AuthResult {
-  AuthStatus authStatus;
+  AuthStatus? authStatus;
-  String authErrorCode;
+  String? authErrorCode;
-  String authErrorMsg;
+  String? authErrorMsg;
 
   AuthResult({this.authStatus, this.authErrorCode, this.authErrorMsg});
 }

lib/domain/entities/cargo_type.dart

@@ -1,28 +1,28 @@
 class CargoType {
   String? id;
   String? name;
-  double? rate;
+  double rate;
-  double? weight;
+  double weight;
-  bool? isChecked;
+  bool isChecked;
-  int? qty;
+  int qty;
   bool? isCutomDuty;
-  double? customDutyFee;
+  double customDutyFee;
+  double calRate;
+  double calWeight;
 
-  double get calAmount => (calRate ?? 0) * (calWeight ?? 0);
+  double get calAmount => calRate * calWeight;
 
-  double? calRate;
-  double? calWeight;
   CargoType(
       {this.id,
       this.name,
-      this.rate,
+      this.rate = 0,
-      this.weight,
+      this.weight = 0,
-      this.calWeight,
+      this.calWeight = 0,
-      this.calRate,
+      this.calRate = 0,
       this.isChecked = false,
       this.qty = 0,
       this.isCutomDuty,
-      this.customDutyFee});
+      this.customDutyFee = 0});
 
   factory CargoType.fromMap(Map<String, dynamic> map, String id) {
     return CargoType(
@@ -63,7 +63,7 @@ class CargoType {
 
   @override
   String toString() {
-    return name!;
+    return name ?? "";
   }
 
   bool isChangedForEdit(CargoType cargoType) {

lib/domain/entities/carton.dart

@@ -9,61 +9,60 @@ import 'cargo_type.dart';
 import 'package.dart';
 
 class Carton {
-  String id;
+  String? id;
-  String shipmentID;
+  String? shipmentID;
-  String shipmentNumber;
+  String? shipmentNumber;
-  String senderID;
+  String? senderID;
-  String senderFCSID;
+  String? senderFCSID;
-  String senderName;
+  String? senderName;
 
-  String boxNumber;
+  String? boxNumber;
-  String status;
+  String? status;
-  String cargoDesc;
+  String? cargoDesc;
-  String desc;
+  String? desc;
   double width;
   double height;
   double length;
-  int shipmentWeight;
+  int? shipmentWeight;
-  bool isChecked;
+  bool? isChecked;
-  bool isShipmentCarton;
+  bool? isShipmentCarton;
-  String cartonType;
+  String? cartonType;
-  String fcsID;
+  String? fcsID;
-  String userName;
+  String? userName;
-  String userID;
+  String? userID;
-  String fcsShipmentID;
+  String? fcsShipmentID;
-  String fcsShipmentNumber;
+  String? fcsShipmentNumber;
-  String mixCartonID;
+  String? mixCartonID;
-  String mixCartonNumber;
+  String? mixCartonNumber;
-  String cartonSizeID;
+  String? cartonSizeID;
-  String cartonSizeName;
+  String? cartonSizeName;
-  double cartonWeight;
+  double? cartonWeight;
 
   int rate;
   int weight;
-  String packageType;
+  String? packageType;
-  String pickUpID;
+  String? pickUpID;
-  List<String> photos;
+  List<String> photos = [];
-  String remark;
+  String? remark;
-  DateTime arrivedDate;
+  DateTime? arrivedDate;
-  String cartonNumber;
+  String? cartonNumber;
 
   List<String> packageIDs;
   List<Package> packages;
-  List<CargoType> cargoTypes;
+  List<CargoType> cargoTypes = [];
 
-  DeliveryAddress deliveryAddress;
+  DeliveryAddress? deliveryAddress;
-  Shipment shipment;
+  Shipment? shipment;
 
   //for mix box
-  String mixBoxType;
+  String? mixBoxType;
   List<Carton> mixCartons;
   List<String> mixCartonIDs;
 
-  int get amount => rate != null && weight != null ? rate * weight : 0;
+  int get amount => rate != null && weight != null ? (rate * weight) : 0;
 
   // String get packageNumber =>
   //     shipmentNumber + "-" + receiverNumber + " #" + boxNumber;
-  double get price => rate.toDouble() * weight;
 
   double get actualWeight =>
       cargoTypes == null ? 0 : cargoTypes.fold(0, (p, e) => e.weight + p);
@@ -84,15 +83,15 @@ class Carton {
   /// getCargoTypeForCalWeight returns carton with shipment weight
   List<CargoType> getCargoTypeForCalWeight(double volumetricRatio) {
     // get shipment weight
-    double volume = (length ?? 0) * (width ?? 0) * (height ?? 0);
+    double volume = length * width * height;
-    double sw = volume / volumetricRatio ?? 0;
+    double sw = volume / volumetricRatio;
 
     // get actual weight
     double aw = cargoTypes.fold(0.0, (p, c) => p + c.weight);
     if (aw == 0 || sw == 0) return [];
 
     cargoTypes.forEach((e) {
-      double calWeight = aw > sw ? e.weight : e.weight / aw * sw;
+      double calWeight = aw > sw ? e.weight : (e.weight / aw) * sw;
       e.calWeight = calWeight;
     });
     return cargoTypes;
@@ -116,7 +115,7 @@ class Carton {
     double total = 0;
     cargoTypes.forEach((e) {
       double r =
-          e.rate - (discountByWeight != null ? discountByWeight.discount : 0);
+          e.rate - (discountByWeight != null ? (discountByWeight.discount) : 0);
       double amount = e.weight * r;
       total += amount;
     });
@@ -134,9 +133,9 @@ class Carton {
       this.senderName,
       this.boxNumber,
       this.desc,
-      this.width,
+      this.width = 0,
-      this.height,
+      this.height = 0,
-      this.length,
+      this.length = 0,
       this.shipmentWeight,
       this.isChecked = false,
       this.cartonType,
@@ -151,13 +150,13 @@ class Carton {
       this.status,
       this.arrivedDate,
       this.cargoDesc,
-      this.shipmentHistory,
+      this.shipmentHistory = const [],
-      this.packages,
+      this.packages = const [],
-      this.cargoTypes,
+      this.cargoTypes = const [],
       this.cartonNumber,
       this.fcsShipmentID,
       this.fcsShipmentNumber,
-      this.packageIDs,
+      this.packageIDs = const [],
       this.mixCartonID,
       this.mixCartonNumber,
       this.isShipmentCarton = false,
@@ -165,14 +164,14 @@ class Carton {
       this.cartonSizeID,
       this.cartonSizeName,
       this.mixBoxType,
-      this.mixCartons,
+      this.mixCartons = const [],
-      this.mixCartonIDs,
+      this.mixCartonIDs = const [],
       this.cartonWeight});
 
   Map<String, dynamic> toMap() {
-    List _cargoTypes = cargoTypes?.map((c) => c.toMap())?.toList() ?? [];
+    List _cargoTypes = cargoTypes.map((c) => c.toMap()).toList();
-    List _packages = packages?.map((c) => c.toJson())?.toList();
+    List _packages = packages.map((c) => c.toJson()).toList();
-    List _mixCartons = mixCartons?.map((c) => c.toJson())?.toList();
+    List _mixCartons = mixCartons.map((c) => c.toJson()).toList();
     return {
       'id': id,
       'fcs_shipment_id': fcsShipmentID,
@@ -213,9 +212,9 @@ class Carton {
       shipmentNumber: map['shipment_number'],
       // receiverNumber: map['receiver_number'],
       boxNumber: map['box_number'],
-      length: double.tryParse(map['length']?.toString()),
+      length: double.tryParse(map['length'].toString()) ?? 0,
-      width: double.tryParse(map['width']?.toString()),
+      width: double.tryParse(map['width'].toString()) ?? 0,
-      height: double.tryParse(map['height']?.toString()),
+      height: double.tryParse(map['height'].toString()) ?? 0,
       userName: map['user_name'],
       fcsID: map['fcs_id'],
       cartonType: map['carton_type'],
@@ -242,8 +241,8 @@ class Carton {
 
   Map<String, dynamic> toJson() {
     List _cargoTypes = cargoTypes.map((c) => c.toMap()).toList();
-    List _packages = packages?.map((c) => c.toJson())?.toList();
+    List _packages = packages.map((c) => c.toJson()).toList();
-    List _mixCartons = mixCartons?.map((c) => c.toJson())?.toList();
+    List _mixCartons = mixCartons.map((c) => c.toJson()).toList();
     return {
       'id': id,
       'fcs_shipment_id': fcsShipmentID,

lib/domain/entities/carton_size.dart

@@ -1,10 +1,11 @@
 class CartonSize {
-  String id;
+  String? id;
-  String name;
+  String? name;
   double length;
   double width;
   double height;
-  CartonSize({this.id, this.name, this.length, this.width, this.height});
+  CartonSize(
+      {this.id, this.name, this.length = 0, this.width = 0, this.height = 0});
 
   Map<String, dynamic> toMap() {
     return {
@@ -27,19 +28,10 @@ class CartonSize {
   }
 
   @override
-  bool operator ==(other) {
+  bool operator ==(Object other) => other is CartonSize && other.id == id;
-    if (identical(this, other)) {
-      return true;
-    }
-    return other.id == this.id;
-  }
 
   @override
-  int get hashCode {
+  int get hashCode => id.hashCode;
-    int result = 17;
-    result = 37 * result + id.hashCode;
-    return result;
-  }
 
   bool isChangedForEdit(CartonSize cartonSize) {
     return cartonSize.name != this.name ||

lib/domain/entities/custom_duty.dart

@@ -1,11 +1,15 @@
 class CustomDuty {
-  String id;
+  String? id;
-  String productType;
+  String? productType;
-  String desc;
+  String? desc;
   double fee;
   double shipmentRate;
   CustomDuty(
-      {this.id, this.productType, this.desc, this.fee, this.shipmentRate});
+      {this.id,
+      this.productType,
+      this.desc,
+      this.fee = 0,
+      this.shipmentRate = 0});
 
   factory CustomDuty.fromMap(Map<String, dynamic> map, String id) {
     return CustomDuty(

lib/domain/entities/customer.dart

@@ -1,10 +1,8 @@
-
-
 class Customer {
-  String id;
+  String? id;
-  String name;
+  String? name;
-  String phoneNumber;
+  String? phoneNumber;
-  String status;
+  String? status;
 
   Customer({
     this.id,

lib/domain/entities/discount.dart

@@ -1,9 +1,9 @@
 class Discount {
-  String id;
+  String? id;
-  String code;
+  String? code;
-  String customerId;
+  String? customerId;
-  String customerName;
+  String? customerName;
-  String status;
+  String? status;
   double amount;
 
   Discount({
@@ -11,7 +11,7 @@ class Discount {
     this.code,
     this.customerId,
     this.customerName,
-    this.amount,
+    this.amount = 0,
     this.status,
   });
 

lib/domain/entities/discount_by_weight.dart

@@ -1,9 +1,9 @@
 class DiscountByWeight {
-  String id;
+  String? id;
   double weight;
   double discount;
 
-  DiscountByWeight({this.id, this.weight, this.discount});
+  DiscountByWeight({this.id, this.weight = 0, this.discount = 0});
 
   factory DiscountByWeight.fromMap(Map<String, dynamic> map, String id) {
     return DiscountByWeight(

lib/domain/entities/faq.dart

@@ -1,16 +1,17 @@
 class FAQ {
-  String id;
+  String? id;
-  int sn;
+  int? sn;
-  String questionEng;
+  String? questionEng;
-  String questionMm;
+  String? questionMm;
-  String answerEng;
+  String? answerEng;
-  String answerMm;
+  String? answerMm;
-  String pageLinkLabelEng;
+  String? pageLinkLabelEng;
-  String pageLinkLabelMm;
+  String? pageLinkLabelMm;
-  String pageLink;
+  String? pageLink;
 
-  String question(bool isEng) => isEng ? questionEng : questionMm;
+  String question(bool isEng) =>
-  String answer(bool isEng) => isEng ? answerEng : answerMm;
+      isEng ? (questionEng ?? "") : (questionMm ?? "");
+  String answer(bool isEng) => isEng ? (answerEng ?? "") : (answerMm ?? "");
 
   FAQ(
       {this.id,

lib/domain/entities/fcs_shipment.dart

@@ -3,17 +3,18 @@ import 'package:cloud_firestore/cloud_firestore.dart';
 import '../constants.dart';
 
 class FcsShipment {
-  String id;
+  String? id;
-  String shipmentNumber;
+  String? shipmentNumber;
-  DateTime cutoffDate;
+  DateTime? cutoffDate;
-  String shipType;
+  String? shipType;
-  DateTime arrivalDate;
+  DateTime? arrivalDate;
-  DateTime departureDate;
+  DateTime? departureDate;
-  String consignee;
+  String? consignee;
-  String port;
+  String? port;
-  String destination;
+  String? destination;
-  String status;
+  String? status;
-  String reportName;
+  String? reportName;
+
   FcsShipment({
     this.id,
     this.shipmentNumber,
@@ -51,10 +52,10 @@ class FcsShipment {
     return {
       "id": id,
       'shipment_number': shipmentNumber,
-      'cutoff_date': cutoffDate?.toUtc()?.toIso8601String(),
+      'cutoff_date': cutoffDate?.toUtc().toIso8601String(),
       'shipment_type': shipType,
-      'arrival_date': arrivalDate?.toUtc()?.toIso8601String(),
+      'arrival_date': arrivalDate?.toUtc().toIso8601String(),
-      'departure_date': departureDate?.toUtc()?.toIso8601String(),
+      'departure_date': departureDate?.toUtc().toIso8601String(),
       'consignee': consignee,
       'port': port,
       'destination': destination,

lib/domain/entities/invoice.dart

@@ -10,15 +10,15 @@ import 'package:fcs/domain/entities/rate.dart';
 import 'package:fcs/domain/entities/shipment.dart';
 
 class Invoice {
-  String id;
+  String? id;
-  String invoiceNumber;
+  String? invoiceNumber;
-  DateTime invoiceDate;
+  DateTime? invoiceDate;
-  String fcsShipmentID;
+  String? fcsShipmentID;
-  String userID;
+  String? userID;
-  String fcsID;
+  String? fcsID;
-  String userName;
+  String? userName;
-  String phoneNumber;
+  String? phoneNumber;
-  String status;
+  String? status;
 
   double handlingFee;
   double deliveryFee;
@@ -30,9 +30,9 @@ class Invoice {
   List<CargoType> cargoTypes;
   List<Shipment> shipments;
   List<Payment> payments;
-  Discount discount;
+  Discount? discount;
-  PaymentMethod paymentMethod;
+  PaymentMethod? paymentMethod;
-  String invoiceURL;
+  String? invoiceURL;
 
   List<CargoType> getCargoTypes(Rate rate) {
     if (cargoTypes != null) return cargoTypes;
@@ -40,7 +40,7 @@ class Invoice {
     List<CargoType> _cargoTypes = [];
     double totalCalWeight = 0;
     cartons.forEach((carton) {
-      if (carton.isChecked) {
+      if (carton.isChecked ?? false) {
         var _cartonsTypes =
             carton.getCargoTypeForCalWeight(rate.volumetricRatio);
         _cartonsTypes.forEach((ct) {
@@ -68,15 +68,15 @@ class Invoice {
 
   double getTotal(Rate rate) {
     List<CargoType> cargoTypes = getCargoTypes(rate);
-    var total = cargoTypes.fold(0.0, (p, c) => c.calAmount + p);
+    double total = cargoTypes.fold(0.0, (p, c) => c.calAmount + p);
     return total;
   }
 
-  double get balance => (amount ?? 0) - (paidAmount ?? 0);
+  double get balance => amount - paidAmount;
 
   double getNetAmount(Rate rate) {
     List<CargoType> cargoTypes = getCargoTypes(rate);
-    var total = cargoTypes.fold(0.0, (p, c) => c.calAmount + p);
+    double total = cargoTypes.fold(0.0, (p, c) => c.calAmount + p);
     total += getCustomFee();
     total += getDeliveryFee();
     total += getHandlingFee();
@@ -85,13 +85,13 @@ class Invoice {
   }
 
   double getHandlingFee() {
-    return shipments?.where((sh) => sh.isSelected ?? false)?.fold(0, (p, s) {
+    return shipments
-      return p + (s?.handlingFee ?? 0) - (s?.paidHandlingFee ?? 0);
+        .where((sh) => sh.isSelected)
-    });
+        .fold(0, (p, s) => p + (s.handlingFee - s.paidHandlingFee));
   }
 
   double getTotalBalance(Rate rate) {
-    return getNetAmount(rate) - (paidAmount ?? 0);
+    return getNetAmount(rate) - paidAmount;
   }
 
   double getCustomFee() {
@@ -102,7 +102,7 @@ class Invoice {
     return deliveryFee == null ? 0 : deliveryFee;
   }
 
-  double getDiscount() => discount == null ? 0 : discount.amount;
+  double getDiscount() => discount == null ? 0 : discount!.amount;
 
   Invoice(
       {this.id,
@@ -111,19 +111,19 @@ class Invoice {
       this.fcsID,
       this.userName,
       this.phoneNumber,
-      this.amount,
+      this.amount = 0,
-      this.paidAmount,
+      this.paidAmount = 0,
       this.discount,
       this.status,
-      this.customDuties,
+      this.customDuties = const [],
-      this.cartons,
+      this.cartons = const [],
-      this.cargoTypes,
+      this.cargoTypes = const [],
-      this.handlingFee,
+      this.handlingFee = 0,
-      this.deliveryFee,
+      this.deliveryFee = 0,
       this.fcsShipmentID,
-      this.shipments,
+      this.shipments = const [],
       this.invoiceURL,
-      this.payments,
+      this.payments = const [],
       this.paymentMethod});
 
   factory Invoice.fromMap(Map<String, dynamic> map, String docID) {
@@ -153,7 +153,7 @@ class Invoice {
     return Invoice(
       id: docID,
       invoiceNumber: map['invoice_number'],
-      invoiceDate: invd?.toDate(),
+      invoiceDate: invd.toDate(),
       userName: map['user_name'],
       fcsID: map['fcs_id'],
       phoneNumber: map['phone_number'],
@@ -174,12 +174,12 @@ class Invoice {
 
   Map<String, dynamic> toMap() {
     List _cargoTypes = cargoTypes.map((c) => c.toMap()).toList();
-    List _customDuties = customDuties?.map((c) => c.toMap())?.toList();
+    List _customDuties = customDuties.map((c) => c.toMap()).toList();
-    List _cartons = cartons?.map((c) => c.toMap())?.toList() ?? [];
+    List _cartons = cartons.map((c) => c.toMap()).toList();
-    List _shipments = shipments?.map((s) => s.toMap())?.toList() ?? [];
+    List _shipments = shipments.map((s) => s.toMap()).toList();
     return {
       "id": id,
-      "invoice_date": invoiceDate?.toUtc()?.toIso8601String(),
+      "invoice_date": invoiceDate?.toUtc().toIso8601String(),
       "user_id": userID,
       "user_name": userName,
       "invoice_number": invoiceNumber,

lib/domain/entities/market.dart

@@ -1,11 +1,8 @@
 class Market {
-  String id;
+  String? id;
-  String name;
+  String? name;
 
-  Market({
+  Market({this.id, this.name});
-    this.id,
-    this.name,
-  });
 
   Map<String, dynamic> toMap() {
     return {

lib/domain/entities/package.dart

@@ -5,35 +5,35 @@ import 'package:fcs/domain/vo/delivery_address.dart';
 import 'package:fcs/domain/vo/shipment_status.dart';
 
 class Package {
-  String id;
+  String? id;
-  String trackingID;
+  String? trackingID;
-  String userID;
+  String? userID;
-  String fcsID;
+  String? fcsID;
-  String userName;
+  String? userName;
-  String phoneNumber;
+  String? phoneNumber;
-  DateTime currentStatusDate;
+  DateTime? currentStatusDate;
   List<String> photoUrls;
   List<ShipmentStatus> shipmentHistory;
-  String desc;
+  String? desc;
 
-  String status;
+  String? status;
-  String shipmentNumber;
+  String? shipmentNumber;
-  String senderFCSID;
+  String? senderFCSID;
-  String senderName;
+  String? senderName;
-  String senderPhoneNumber;
+  String? senderPhoneNumber;
-  String boxNumber;
+  String? boxNumber;
-  String cargoDesc;
+  String? cargoDesc;
-  String market;
+  String? market;
   bool isChecked;
 
   int rate;
   int weight;
-  String packageType;
+  String? packageType;
-  String pickUpID;
+  String? pickUpID;
-  List<String> photos;
+  // List<String> photos;
-  String remark;
+  String? remark;
-  DateTime arrivedDate;
+  DateTime? arrivedDate;
-  DeliveryAddress deliveryAddress;
+  DeliveryAddress? deliveryAddress;
 
   //for packages in processing
   List<File> photoFiles;
@@ -42,35 +42,34 @@ class Package {
 
   double get price => rate.toDouble() * weight;
 
-  Package({
+  Package(
-    this.id,
+      {this.id,
-    this.trackingID,
+      this.trackingID,
-    this.userID,
+      this.userID,
-    this.userName,
+      this.userName,
-    this.fcsID,
+      this.fcsID,
-    this.phoneNumber,
+      this.phoneNumber,
-    this.shipmentNumber,
+      this.shipmentNumber,
-    this.senderFCSID,
+      this.senderFCSID,
-    this.senderName,
+      this.senderName,
-    this.boxNumber,
+      this.boxNumber,
-    this.rate,
+      this.rate = 0,
-    this.weight,
+      this.weight = 0,
-    this.packageType,
+      this.packageType,
-    this.pickUpID,
+      this.pickUpID,
-    this.remark,
+      this.remark,
-    this.status,
+      this.status,
-    this.arrivedDate,
+      this.arrivedDate,
-    this.cargoDesc,
+      this.cargoDesc,
-    this.market,
+      this.market,
-    this.shipmentHistory,
+      this.shipmentHistory = const [],
-    this.currentStatusDate,
+      this.currentStatusDate,
-    this.photoUrls,
+      this.photoUrls = const [],
-    this.desc,
+      this.desc,
-    this.deliveryAddress,
+      this.deliveryAddress,
-    this.isChecked = false,
+      this.isChecked = false,
-    this.photoFiles,
+      this.photoFiles = const [],
-    this.senderPhoneNumber
+      this.senderPhoneNumber});
-  });
 
   factory Package.fromMap(Map<String, dynamic> map, String docID) {
     var _currentStatusDate = (map['status_date'] as Timestamp);
@@ -98,9 +97,7 @@ class Package {
         senderName: map['sender_name'],
         senderPhoneNumber: map['sender_phone_number'],
         deliveryAddress: _da,
-        currentStatusDate: _currentStatusDate != null
+        currentStatusDate: _currentStatusDate.toDate().toLocal(),
-            ? _currentStatusDate.toDate().toLocal()
-            : null,
         photoUrls: _photoUrls,
         shipmentHistory: _shipmentStatus);
   }

lib/domain/entities/payment.dart

@@ -1,11 +1,11 @@
 import 'package:cloud_firestore/cloud_firestore.dart';
 
 class Payment {
-  String id;
+  String? id;
-  String invoiceID;
+  String? invoiceID;
-  DateTime paymentDate;
+  DateTime? paymentDate;
-  String paymentReceiptURL;
+  String? paymentReceiptURL;
-  String status;
+  String? status;
   double amount;
 
   Payment(
@@ -14,13 +14,13 @@ class Payment {
       this.paymentDate,
       this.paymentReceiptURL,
       this.status,
-      this.amount});
+      this.amount = 0});
 
   factory Payment.fromMap(Map<String, dynamic> map, String id) {
     var _paymentDate = (map['payment_date'] as Timestamp);
     return Payment(
       id: id,
-      paymentDate: _paymentDate?.toDate(),
+      paymentDate: _paymentDate.toDate(),
       paymentReceiptURL: map['payment_receipt_url'],
       status: map['status'],
       amount: map['amount']?.toDouble() ?? 0,
@@ -31,7 +31,7 @@ class Payment {
     return {
       "id": id,
       "invoice_id": invoiceID,
-      'payment_date': paymentDate?.toUtc()?.toIso8601String(),
+      'payment_date': paymentDate?.toUtc().toIso8601String(),
       'payment_receipt_url': paymentReceiptURL,
       'status': status,
       'amount': amount,
@@ -39,7 +39,7 @@ class Payment {
   }
 
   Payment clone() {
-    return Payment.fromMap(toMap(), this.id);
+    return Payment.fromMap(toMap(), this.id!);
   }
 
   @override

lib/domain/entities/payment_method.dart

@@ -1,11 +1,11 @@
 class PaymentMethod {
-  String id;
+  String? id;
-  String name;
+  String? name;
-  String accountName;
+  String? accountName;
-  String account;
+  String? account;
-  String phone;
+  String? phone;
-  String email;
+  String? email;
-  String link;
+  String? link;
 
   PaymentMethod(
       {this.id,

lib/domain/entities/processing.dart

@@ -1,15 +1,15 @@
 import 'package:fcs/domain/entities/package.dart';
 
 class Processing {
-  String id;
+  String? id;
   //for consignee
-  String userID;
+  String? userID;
-  String userName;
+  String? userName;
-  String userPhoneNumber;
+  String? userPhoneNumber;
   //for shipper
-  String fcsID;
+  String? fcsID;
-  String shipperName;
+  String? shipperName;
-  String shipperPhoneNumber;
+  String? shipperPhoneNumber;
 
   List<Package> packages;
 
@@ -21,7 +21,7 @@ class Processing {
       this.fcsID,
       this.shipperName,
       this.shipperPhoneNumber,
-      this.packages});
+      this.packages = const []});
 
   @override
   bool operator ==(Object other) => other is Processing && other.id == id;

lib/domain/entities/rate.dart

@@ -1,4 +1,3 @@
-
 import 'package:fcs/domain/entities/discount_by_weight.dart';
 
 import 'cargo_type.dart';
@@ -11,26 +10,25 @@ class Rate {
   double diffDiscountWeight;
   double diffWeightRate;
 
-  List<CargoType> cargoTypes;
+  List<CargoType> cargoTypes = [];
-  List<CargoType> customDuties;
+  List<CargoType> customDuties = [];
-  List<DiscountByWeight> discountByWeights;
+  List<DiscountByWeight> discountByWeights = [];
 
   DiscountByWeight getDiscountByWeight(double weight) {
     discountByWeights.sort((d1, d2) => d2.weight.compareTo(d1.weight));
-    return discountByWeights.firstWhere((e) => e.weight < weight,
+    return discountByWeights.firstWhere((e) => e.weight < weight);
-        orElse: () => null);
   }
 
-  CargoType get defaultCargoType => cargoTypes == null
+  CargoType? get defaultCargoType => cargoTypes == null
       ? null
       : cargoTypes.firstWhere((e) => e.name == "General");
 
   Rate(
-      {this.deliveryFee,
+      {this.deliveryFee = 0,
-      this.freeDeliveryWeight,
+      this.freeDeliveryWeight = 0,
-      this.volumetricRatio,
+      this.volumetricRatio = 0,
-      this.diffDiscountWeight,
+      this.diffDiscountWeight = 0,
-      this.diffWeightRate});
+      this.diffWeightRate = 0});
 
   factory Rate.fromMap(Map<String, dynamic> map) {
     return Rate(

lib/domain/entities/receipt.dart

@@ -1,9 +1,9 @@
 class Receipt {
-  String id;
+  String? id;
-  int amount;
+  int? amount = 0;
-  String date;
+  String? date;
-  String status;
+  String? status;
-  String fileUrl;
+  String? fileUrl;
 
   Receipt({this.id, this.amount, this.date, this.status, this.fileUrl});
 }

lib/domain/entities/setting.dart

@@ -9,21 +9,20 @@ List<Day> dayLists = [
 ];
 
 class Setting {
-  final int supportBuildNum;
+  final int? supportBuildNum;
-
   // contact page
-  String usaAddress;
+  String? usaAddress;
-  String mmAddress;
+  String? mmAddress;
-  String usaContactNumber;
+  String? usaContactNumber;
-  String mmContactNumber;
+  String? mmContactNumber;
-  String emailAddress;
+  String? emailAddress;
-  String facebookLink;
+  String? facebookLink;
-  bool inviteRequired;
+  bool? inviteRequired;
-  String appUrl;
+  String? appUrl;
-  final String termsEng;
+  final String? termsEng;
-  final String termsMm;
+  final String? termsMm;
-  String about;
+  String? about;
-  String courierWebsite;
+  String? courierWebsite;
 
   List<String> shipmentTypes;
 
@@ -40,7 +39,7 @@ class Setting {
       this.termsEng,
       this.termsMm,
       this.about,
-      this.shipmentTypes,
+      this.shipmentTypes = const [],
       this.courierWebsite});
 
   factory Setting.fromMap(Map<String, dynamic> map) {
@@ -76,9 +75,9 @@ class Setting {
 }
 
 class Day {
-  int id;
+  int? id;
-  String name;
+  String? name;
-  bool isChecked = false;
+  bool? isChecked = false;
   Day({this.id, this.name, this.isChecked});
 
   @override

lib/domain/entities/shipment.dart

@@ -4,35 +4,35 @@ import 'package:fcs/domain/entities/carton.dart';
 import 'package:fcs/domain/vo/delivery_address.dart';
 
 class Shipment {
-  String id;
+  String? id;
-  String shipmentNumber;
+  String? shipmentNumber;
-  String shipmentType;
+  String? shipmentType;
-  DeliveryAddress pickupAddress;
+  DeliveryAddress? pickupAddress;
-  DateTime pickupDate;
+  DateTime? pickupDate;
-  String pickupTimeStart;
+  String? pickupTimeStart;
-  String pickupTimeEnd;
+  String? pickupTimeEnd;
 
-  String userName;
+  String? userName;
-  String userID;
+  String? userID;
-  String phoneNumber;
+  String? phoneNumber;
-  int numberOfPackage;
+  int numberOfPackage = 0;
-  int weight;
+  int weight = 0;
-  double handlingFee;
+  double handlingFee = 0;
-  double paidHandlingFee;
+  double paidHandlingFee = 0;
-  String address;
+  String? address;
-  String status;
+  String? status;
   bool isCourier;
   int radioIndex;
   List<Carton> boxes;
 
-  String pickupUserID;
+  String? pickupUserID;
-  String pickupUserName;
+  String? pickupUserName;
-  String pickupUserPhoneNumber;
+  String? pickupUserPhoneNumber;
 
-  String fcsShipmentID;
+  String? fcsShipmentID;
-  String fcsShipmentNumber;
+  String? fcsShipmentNumber;
-  String shipmentLabelUrl;
+  String? shipmentLabelUrl;
-  bool isSelected;
+  bool isSelected = false;
 
   Shipment(
       {this.id,
@@ -43,28 +43,28 @@ class Shipment {
       this.phoneNumber,
       this.pickupTimeStart,
       this.pickupTimeEnd,
-      this.numberOfPackage,
+      this.numberOfPackage = 0,
-      this.weight,
+      this.weight = 0,
-      this.handlingFee,
+      this.handlingFee = 0,
-      this.paidHandlingFee,
+      this.paidHandlingFee = 0,
       this.address,
       this.status,
       this.pickupDate,
       this.isCourier = false,
       this.radioIndex = 1,
-      this.pickupAddress,
+      required this.pickupAddress,
       this.pickupUserID,
       this.pickupUserName,
       this.pickupUserPhoneNumber,
       this.fcsShipmentID,
       this.fcsShipmentNumber,
       this.shipmentLabelUrl,
-      this.boxes});
+      this.boxes = const []});
 
-  int get last => DateTime.now().difference(pickupDate).inDays;
+  // int get last => DateTime.now().difference(pickupDate).inDays;
 
-  double get totalWeight => boxes?.fold(0, (p, e) => p + e.actualWeight);
+  double get totalWeight => boxes.fold(0, (p, e) => p + e.actualWeight);
-  int get totalCount => boxes?.length;
+  int get totalCount => boxes.length;
 
   bool get isPending => status == shipment_pending_status;
   bool get isAssigned => status == shipment_assigned_status;
@@ -100,15 +100,15 @@ class Shipment {
   }
 
   Map<String, dynamic> toMap() {
-    List _boxes = boxes?.map((l) => l.toMap())?.toList() ?? [];
+    List _boxes = boxes.map((l) => l.toMap()).toList();
 
     return {
       "id": id,
       'user_id': userID,
       'cartons': _boxes,
       'shipment_type': shipmentType,
-      'pickup_address': pickupAddress.toMap(),
+      'pickup_address': pickupAddress?.toMap(),
-      "pickup_date": pickupDate?.toUtc()?.toIso8601String(),
+      "pickup_date": pickupDate?.toUtc().toIso8601String(),
       'pickup_time_start': pickupTimeStart,
       'pickup_time_end': pickupTimeEnd,
       'pickup_user_id': pickupUserID,

lib/domain/entities/user.dart

@@ -9,18 +9,19 @@ DateFormat timeFormat = DateFormat("HH:mm");
 final DateFormat dateFormat = DateFormat("d MMM yyyy");
 
 class User {
-  String id;
+  String? id;
-  String name;
+  String? name;
-  String phoneNumber;
+  String? phoneNumber;
-  String status;
+  String? status;
-  String fcsID;
+  String? fcsID;
-  DateTime lastMessageTime;
+  DateTime? lastMessageTime;
-  String lastMessage;
+  String? lastMessage;
-  int userUnseenCount;
+  int? userUnseenCount;
-  int fcsUnseenCount;
+  int? fcsUnseenCount;
-  String preferCurrency;
+  String? preferCurrency;
 
-  String get initial => name != null && name != "" ? name.substring(0, 1) : "?";
+  String get initial =>
+      name != null && name != "" ? name!.substring(0, 1) : "?";
 
   String get getLastMessage {
     var msg = lastMessage ?? "Say hi to $name";
@@ -31,27 +32,31 @@ class User {
   String get getLastMessageTime {
     if (lastMessageTime == null) return "";
     DateTime today = DateTime.now();
-    if (lastMessageTime.year == today.year &&
+    if (lastMessageTime!.year == today.year &&
-        lastMessageTime.month == today.month &&
+        lastMessageTime!.month == today.month &&
-        lastMessageTime.day == today.day) {
+        lastMessageTime!.day == today.day) {
-      return timeFormat.format(lastMessageTime);
+      return timeFormat.format(lastMessageTime!);
     } else {
-      return dateFormat.format(lastMessageTime);
+      return dateFormat.format(lastMessageTime!);
     }
   }
 
   String get getUserUnseenCount => userUnseenCount != null
-      ? userUnseenCount > 100 ? "99+" : userUnseenCount.toString()
+      ? userUnseenCount! > 100
+          ? "99+"
+          : userUnseenCount.toString()
       : "0";
   String get getFcsUnseenCount => fcsUnseenCount != null
-      ? fcsUnseenCount > 100 ? "99+" : fcsUnseenCount.toString()
+      ? fcsUnseenCount! > 100
+          ? "99+"
+          : fcsUnseenCount.toString()
       : "0";
 
   List<String> privileges = [];
 
-  String get phone => phoneNumber != null && phoneNumber.startsWith("959")
+  String get phone => phoneNumber != null && phoneNumber!.startsWith("959")
-      ? "0${phoneNumber.substring(2)}"
+      ? "0${phoneNumber!.substring(2)}"
-      : phoneNumber;
+      : phoneNumber!;
   bool get joined => status != null && status == user_joined_status;
   bool get invited => status != null && status == user_invited_status;
   bool get requested => status != null && status == user_requested_status;
@@ -64,7 +69,7 @@ class User {
       this.phoneNumber,
       this.fcsID,
       this.status,
-      this.privileges,
+      this.privileges = const [],
       this.lastMessage,
       this.lastMessageTime,
       this.userUnseenCount,

lib/domain/exceiptions/server_exceptions.dart

@@ -1,12 +1,12 @@
 
 class ServerException  {
   @override
-  List<Object> get props => null;
+  List<Object>? get props => null;
 
   call() {
     return null;
   }
 
   @override
-  bool get stringify => null;
+  bool? get stringify => null;
 }

lib/domain/vo/contact.dart

@@ -1,12 +1,12 @@
 import 'package:fcs/domain/entities/setting.dart';
 
 class Contact {
-  String usaAddress;
+  String? usaAddress;
-  String mmAddress;
+  String? mmAddress;
-  String usaContactNumber;
+  String? usaContactNumber;
-  String mmContactNumber;
+  String? mmContactNumber;
-  String emailAddress;
+  String? emailAddress;
-  String facebookLink;
+  String? facebookLink;
 
   Contact({
     this.usaAddress,

lib/domain/vo/delivery_address.dart

@@ -1,13 +1,14 @@
 class DeliveryAddress {
-  String id;
+  String? id;
-  String fullName;
+  String? fullName;
-  String addressLine1;
+  String? addressLine1;
-  String addressLine2;
+  String? addressLine2;
-  String city;
+  String? city;
-  String state;
+  String? state;
-  String phoneNumber;
+  String? phoneNumber;
   bool isDefault;
-  String userID;
+  String? userID;
+
   DeliveryAddress(
       {this.id,
       this.fullName,

lib/domain/vo/message.dart

@@ -1,15 +1,15 @@
 import 'package:cloud_firestore/cloud_firestore.dart';
 
 class Message {
-  String id;
+  String? id;
-  String message;
+  String? message;
-  DateTime date;
+  DateTime? date;
-  String receiverID;
+  String? receiverID;
-  String receiverName;
+  String? receiverName;
-  String senderID;
+  String? senderID;
-  String senderName;
+  String? senderName;
-  String messageType;
+  String? messageType;
-  String messageID;
+  String? messageID;
 
   Message(
       {this.id,
@@ -21,11 +21,13 @@ class Message {
       this.senderName,
       this.messageType,
       this.messageID});
+
   bool fromToday() {
+    if (date == null) return false;
     var now = DateTime.now();
-    return date.day == now.day &&
+    return date!.day == now.day &&
-        date.month == now.month &&
+        date!.month == now.month &&
-        date.year == now.year;
+        date!.year == now.year;
   }
 
   Map<String, dynamic> toMap() {
@@ -36,9 +38,10 @@ class Message {
   }
 
   bool sameDay(Message another) {
-    return date.year == another.date.year &&
+    if (date == null) return false;
-        date.month == another.date.month &&
+    return date!.year == another.date!.year &&
-        date.day == another.date.day;
+        date!.month == another.date!.month &&
+        date!.day == another.date!.day;
   }
 
   factory Message.fromMap(Map<String, dynamic> map, String id) {
@@ -52,7 +55,7 @@ class Message {
       receiverName: map['receiver_name'],
       messageType: map['msg_type'],
       messageID: map['msg_id'],
-      date: date != null ? date.toDate() : null,
+      date: date.toDate(),
     );
   }
 }

lib/domain/vo/privilege.dart

@@ -1,20 +1,24 @@
 import 'package:fcs/domain/constants.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_icons/flutter_icons.dart';
+import 'package:flutter_icons_null_safety/flutter_icons_null_safety.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 
 class Privilege {
   String id;
-  String name;
+  String? name;
-  String desc;
+  String? desc;
-  bool sysAdminOnly = true;
+  bool? sysAdminOnly = true;
-  bool isChecked = false;
+  bool? isChecked = false;
 
-  IconData iconData;
+  IconData? iconData;
 
   Privilege(
-      {this.id, this.name, this.desc, this.isChecked, this.sysAdminOnly}) {
+      {required this.id,
+      this.name,
+      this.desc,
+      this.isChecked,
+      this.sysAdminOnly}) {
     if (this.id == privilege_admin) {
       iconData = MaterialCommunityIcons.account_tie;
     } else if (this.id == privilege_support) {

lib/domain/vo/radio.dart

@@ -1,5 +0,0 @@
-class RadioGroup {
-  String text;
-  int index;
-  RadioGroup({this.text, this.index});
-}

lib/domain/vo/shipment_status.dart

@@ -3,17 +3,21 @@ import 'package:cloud_firestore/cloud_firestore.dart';
 class ShipmentStatus {
   String status;
   DateTime date;
-  bool done;
+  bool? done;
-  String staffId;
+  String? staffId;
-  String staffName;
+  String? staffName;
   ShipmentStatus(
-      {this.status, this.date, this.done, this.staffId, this.staffName});
+      {required this.status,
+      required this.date,
+      this.done,
+      this.staffId,
+      this.staffName});
 
   factory ShipmentStatus.fromMap(Map<String, dynamic> map) {
     var _date = (map['date'] as Timestamp);
     return ShipmentStatus(
         status: map['status'],
-        date: _date == null ? null : _date.toDate(),
+        date: _date.toDate(),
         done: map['done'],
         staffId: map['staff_id'],
         staffName: map['staff_name']);

lib/domain/vo/status.dart

@@ -1,8 +1,7 @@
-
 class Status {
-  String status;
+  String? status;
-  String message;
+  String? message;
-  String errorCode;
+  String? errorCode;
   Status(this.status, this.message);
 
   Status.fromJson(Map<String, dynamic> json) {

lib/domain/vo/term.dart

@@ -1,8 +1,8 @@
 import 'package:fcs/domain/entities/setting.dart';
 
 class Term {
-  String termEng;
+  String? termEng;
-  String termMm;
+  String? termMm;
 
   Term({this.termEng, this.termMm});
 

lib/helpers/api_helper.dart

@@ -20,8 +20,8 @@ Future<dynamic> requestAPI(
   String path,
   method, {
   dynamic payload,
-  String token,
+  String? token,
-  String url,
+  String? url,
 }) async {
   DevInfo devInfo = await DevInfo.getDevInfo();
 
@@ -33,7 +33,7 @@ Future<dynamic> requestAPI(
     headers["Token"] = token;
   }
   if (devInfo != null && devInfo.deviceID != null && deviceName != null) {
-    headers["Device"] = devInfo.deviceID + ":" + deviceName;
+    headers["Device"] = devInfo.deviceID??"" + ":" + deviceName;
   }
   headers["Project-ID"] = Config.instance.reportProjectID;
 
@@ -66,7 +66,7 @@ Future<dynamic> requestAPI(
 // request makes http request
 // if token is null
 Future<dynamic> requestDownloadAPI(String path, method,
-    {dynamic payload, String token, String url, String filePath}) async {
+    {dynamic payload, String? token, String? url, String? filePath}) async {
   DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
   AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
   String deviceName = "${androidInfo.model}(${androidInfo.id})";
@@ -81,7 +81,7 @@ Future<dynamic> requestDownloadAPI(String path, method,
     log.info("Path:$baseUrl$path");
     HttpClient client = new HttpClient();
     var _downloadData = StringBuffer();
-    var fileSave = new File(filePath);
+    var fileSave = new File(filePath!);
     var request = await client.getUrl(Uri.parse("$baseUrl$path"));
     request.headers.set("Project-ID", Config.instance.reportProjectID);
     request.headers
@@ -108,7 +108,7 @@ Future<dynamic> requestDownloadAPI(String path, method,
 // request makes http request
 // if token is null
 Future<dynamic> requestDownloadPDFAPI(String path, method,
-    {dynamic payload, String token, String url, String filePath}) async {
+    {dynamic payload, String? token, String? url, String? filePath}) async {
   DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
   AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
   String deviceName = "${androidInfo.model}(${androidInfo.id})";
@@ -123,7 +123,7 @@ Future<dynamic> requestDownloadPDFAPI(String path, method,
     log.info("Path:$baseUrl$path");
     HttpClient client = new HttpClient();
     // var _downloadData = StringBuffer();
-    var fileSave = new File(filePath);
+    var fileSave = new File(filePath!);
     var request = await client.getUrl(Uri.parse("$baseUrl$path"));
     request.headers.set("Project-ID", Config.instance.reportProjectID);
     if (token != null) {
@@ -135,7 +135,7 @@ Future<dynamic> requestDownloadPDFAPI(String path, method,
     request.headers.set("payload", escapePayload);
     var response = await request.close();
     print("headers:${response.headers}");
-    var _downloadData = List<int>();
+    List<int> _downloadData = [];
 
     response.listen((d) => _downloadData.addAll(d), onDone: () {
       fileSave.writeAsBytes(_downloadData);
@@ -155,10 +155,10 @@ typedef OnDownloadDone(File file);
 // if token is null
 Future<dynamic> requestDownload(String path, method,
     {dynamic payload,
-    String token,
+    required String token,
-    String url,
+    required String url,
-    String filePath,
+    required String filePath,
-    OnDownloadDone onDownloadDone}) async {
+    OnDownloadDone? onDownloadDone}) async {
   DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
   AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
   String deviceName = "${androidInfo.model}(${androidInfo.id})";
@@ -188,7 +188,7 @@ Future<dynamic> requestDownload(String path, method,
     // request.write(escapePayload);
     var response = await request.close();
     print("headers:${response.headers}");
-    var _downloadData = List<int>();
+    List<int> _downloadData = [];
     var cd = response.headers.value("content-disposition");
     String fileName = "download.csv";
     if (cd != null && cd.contains("filename=")) {

lib/helpers/dev_info.dart

@@ -2,13 +2,13 @@ import 'package:device_info/device_info.dart';
 import 'dart:io' show Platform;
 
 class DevInfo {
-  bool isAndroid;
+  bool? isAndroid;
-  bool isIOS;
+  bool? isIOS;
-  String deviceID;
+  String? deviceID;
-  String id;
+  String? id;
-  String model;
+  String? model;
 
-  static DevInfo _instance;
+  static DevInfo? _instance;
 
   static Future<DevInfo> getDevInfo() async {
     if (_instance != null) return Future.value(_instance);
@@ -18,14 +18,14 @@ class DevInfo {
 
     if (Platform.isAndroid) {
       AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
-      _instance.deviceID = androidInfo.androidId;
+      _instance!.deviceID = androidInfo.androidId;
-      _instance.id = androidInfo.id;
+      _instance!.id = androidInfo.id;
-      _instance.model = androidInfo.model;
+      _instance!.model = androidInfo.model;
     } else if (Platform.isIOS) {
       IosDeviceInfo iosDeviceInfo = await deviceInfo.iosInfo;
-      _instance.deviceID = iosDeviceInfo.identifierForVendor;
+      _instance!.deviceID = iosDeviceInfo.identifierForVendor;
-      _instance.id = iosDeviceInfo.utsname.release;
+      _instance!.id = iosDeviceInfo.utsname.release;
-      _instance.model = iosDeviceInfo.model;
+      _instance!.model = iosDeviceInfo.model;
     }
     return Future.value(_instance);
   }

lib/helpers/firebase_helper.dart

@@ -1,32 +1,31 @@
 import 'dart:io';
 
-import 'package:fcs/config.dart';
+import 'package:firebase_auth/firebase_auth.dart' as fb;
-import 'package:firebase_auth/firebase_auth.dart';
 import 'package:firebase_storage/firebase_storage.dart';
 import 'package:logging/logging.dart';
 import 'package:uuid/uuid.dart';
 
 final log = Logger('firebaseHelper');
 
-final FirebaseAuth auth = FirebaseAuth.instance;
+final fb.FirebaseAuth auth = fb.FirebaseAuth.instance;
 
 Future<String> getToken() async {
-  FirebaseUser firebaseUser = await auth.currentUser();
+  fb.User? firebaseUser = fb.FirebaseAuth.instance.currentUser;
-  IdTokenResult token = await firebaseUser.getIdToken();
+  String token = await firebaseUser?.getIdToken() ?? "";
-  return token.token;
+  return token;
 }
 
-Future<Map> getClaims({bool refreshIdToken = false}) async {
+Future<Map?> getClaims({bool refreshIdToken = false}) async {
-  FirebaseUser firebaseUser = await auth.currentUser();
+  fb.User? firebaseUser = auth.currentUser;
   if (firebaseUser == null) return null;
-  IdTokenResult idToken =
+  fb.IdTokenResult idToken =
-      await firebaseUser.getIdToken(refresh: refreshIdToken);
+      await firebaseUser.getIdTokenResult(refreshIdToken);
   return idToken.claims;
 }
 
 // returns list of url
 Future<List<String>> uploadFiles(String path, List<File> files,
-    {String fileName}) async {
+    {String? fileName}) async {
   List<Future<String>> fu = [];
   for (File f in files) {
     Future<String> u = uploadStorage(path, f);
@@ -35,22 +34,27 @@ Future<List<String>> uploadFiles(String path, List<File> files,
   return Future.wait(fu);
 }
 
-Future<String> uploadStorage(String path, File file, {String fileName}) async {
+Future<String> uploadStorage(String path, File file, {String? fileName}) async {
   if (fileName == null) {
     fileName = Uuid().v4();
   }
-  StorageReference storageReference =
+  Reference ref = FirebaseStorage.instance.ref().child('$path/$fileName');
-      FirebaseStorage(storageBucket: Config.instance.bucketName)
+  UploadTask uploadTask = ref.putFile(file);
-          .ref()
+  await uploadTask.resume();
-          .child('$path/$fileName');
+  String downloadUrl = await ref.getDownloadURL();
-  StorageUploadTask uploadTask = storageReference.putFile(file);
-  await uploadTask.onComplete;
-  String downloadUrl = await storageReference.getDownloadURL();
-  print("name:${await storageReference.getName()}");
-  print("bucket:${await storageReference.getBucket()}");
-  print("path:${await storageReference.getPath()}");
-  print("meta:${await storageReference.getMetadata()}");
   return downloadUrl;
+  // StorageReference storageReference =
+  //     FirebaseStorage(storageBucket: Config.instance.bucketName)
+  //         .ref()
+  //         .child('$path/$fileName');
+  // StorageUploadTask uploadTask = storageReference.putFile(file);
+  // await uploadTask.onComplete;
+  // String downloadUrl = await storageReference.getDownloadURL();
+  // print("name:${await storageReference.getName()}");
+  // print("bucket:${await storageReference.getBucket()}");
+  // print("path:${await storageReference.getPath()}");
+  // print("meta:${await storageReference.getMetadata()}");
+  // return downloadUrl;
 }
 
 Future<void> deleteStorageFromUrls(List<String> urls) async {
@@ -62,10 +66,12 @@ Future<void> deleteStorageFromUrls(List<String> urls) async {
 
 Future<void> deleteStorageFromUrl(String url) async {
   try {
-    StorageReference storageReference =
+    Reference ref = FirebaseStorage.instance.refFromURL(url);
-        await FirebaseStorage(storageBucket: Config.instance.bucketName)
+    await ref.delete();
-            .getReferenceFromUrl(url);
+    // StorageReference storageReference =
-    await storageReference.delete();
+    //     await FirebaseStorage(storageBucket: Config.instance.bucketName)
+    //         .getReferenceFromUrl(url);
+    // await storageReference.delete();
   } catch (e) {
     log.warning("deleteStorage:$e");
   }

lib/helpers/network_connectivity.dart

@@ -11,7 +11,7 @@ class NetworkConnectivity {
   final log = Logger('NetworkConnectivity');
 
   static final NetworkConnectivity instance = NetworkConnectivity._internal();
-  static String hostName;
+  static String? hostName;
   NetworkConnectivity._internal() {
     _initialise();
     var uri = Uri.parse(Config.instance.apiURL);
@@ -38,7 +38,7 @@ class NetworkConnectivity {
     // lookup if connectivity is not none
     if (result != ConnectivityResult.none) {
       try {
-        final hostNameLookup = await InternetAddress.lookup(hostName);
+        final hostNameLookup = await InternetAddress.lookup(hostName ?? "");
         if (hostNameLookup.isNotEmpty &&
             hostNameLookup[0].rawAddress.isNotEmpty) {
           if (await checkHeartbeat()) {

lib/helpers/paginator.dart

@@ -13,7 +13,7 @@ class Paginator<T> {
   final log = Logger('Paginator');
 
   final int rowPerLoad;
-  DocumentSnapshot prev;
+  DocumentSnapshot? prev;
   bool ended = false;
   bool isLoading = false;
   List<T> values = [];
@@ -21,7 +21,7 @@ class Paginator<T> {
 
   Query pageQuery;
 
-  Paginator(this.pageQuery, {this.rowPerLoad = 20, this.toObj}) {
+  Paginator(this.pageQuery, {this.rowPerLoad = 20, required this.toObj}) {
     _clearState();
   }
 
@@ -36,27 +36,27 @@ class Paginator<T> {
     _clearState();
   }
 
-  Future<void> refresh({CallBack onFinished}) async {
+  Future<void> refresh({CallBack? onFinished}) async {
     _clearState();
     await load();
     if (onFinished != null) onFinished();
   }
 
-  Future<bool> load({CallBack onFinished}) async {
+  Future<bool?> load({CallBack? onFinished}) async {
     if (ended) return null;
     isLoading = true;
     Query _query =
-        prev != null ? pageQuery.startAfterDocument(prev) : pageQuery;
+        prev != null ? pageQuery.startAfterDocument(prev!) : pageQuery;
     try {
       await _query
           .limit(rowPerLoad)
-          .getDocuments(source: Source.server)
+          .get(GetOptions(source: Source.server))
           .then((QuerySnapshot snapshot) {
-        int count = snapshot.documents.length;
+        int count = snapshot.docs.length;
         ended = count < rowPerLoad;
-        prev = count > 0 ? snapshot.documents[count - 1] : prev;
+        prev = count > 0 ? snapshot.docs[count - 1] : prev;
-        snapshot.documents.forEach((e) {
+        snapshot.docs.forEach((e) {
-          values.add(toObj(e.data, e.documentID));
+          values.add(toObj(e.data() as Map<String, dynamic>, e.id));
         });
       });
     } catch (e) {

lib/helpers/shared_pref.dart

@@ -7,17 +7,17 @@ class SharedPref {
   static final SharedPref instance = SharedPref._();
   SharedPref._();
 
-  static Future<bool> isFirstLaunch() async {
+  static Future<bool?> isFirstLaunch() async {
     SharedPreferences prefs = await SharedPreferences.getInstance();
     return prefs.getBool('first_launch');
   }
 
   static Future<void> finishFirstLaunch() async {
     SharedPreferences prefs = await SharedPreferences.getInstance();
-    return prefs.setBool('first_launch', false);
+    prefs.setBool('first_launch', false);
   }
 
-  static Future<String> getLang() async {
+  static Future<String?> getLang() async {
     SharedPreferences prefs = await SharedPreferences.getInstance();
     return prefs.getString('language');
   }
@@ -27,7 +27,7 @@ class SharedPref {
     prefs.setString('language', lang);
   }
 
-  static Future<bool> getStaffMode() async {
+  static Future<bool?> getStaffMode() async {
     SharedPreferences prefs = await SharedPreferences.getInstance();
     return prefs.getBool('staff_mode_on');
   }
@@ -41,7 +41,7 @@ class SharedPref {
     await _save("user", user.toJson());
   }
 
-  static Future<User> getUser() async {
+  static Future<User?> getUser() async {
     try {
       return User.fromJson(await _read("user"));
     } catch (e) {
@@ -57,7 +57,7 @@ class SharedPref {
     await _save("skipped_recovery_email", skipped);
   }
 
-  static Future<bool> getSkippedRecoverEmail() async {
+  static Future<bool?> getSkippedRecoverEmail() async {
     try {
       bool _skipped = await _read("skipped_recovery_email");
       return _skipped;
@@ -69,7 +69,7 @@ class SharedPref {
   static _read(String key) async {
     try {
       final prefs = await SharedPreferences.getInstance();
-      return json.decode(prefs.getString(key));
+      return json.decode(prefs.getString(key) ?? "");
     } catch (e) {
       print("Error:$e");
     }

lib/helpers/theme.dart

@@ -20,8 +20,10 @@ const TextStyle labelStyleMM = TextStyle(
     fontFamily: "Myanmar3");
 const TextStyle subMenuStyle =
     TextStyle(fontSize: 14, color: Colors.white, fontWeight: FontWeight.w500);
-const TextStyle subMenuStyleMM =
+const TextStyle subMenuStyleMM = TextStyle(
-    TextStyle(fontSize: 14, color: Colors.white, fontWeight: FontWeight.w500,
+    fontSize: 14,
+    color: Colors.white,
+    fontWeight: FontWeight.w500,
     fontFamily: "Myanmar3");
 
 const TextStyle welcomeLabelStyle =
@@ -31,11 +33,10 @@ const TextStyle welcomeSubLabelStyle =
 const TextStyle siginButtonStyle =
     TextStyle(fontSize: 16, color: Colors.white, fontWeight: FontWeight.w500);
 
-
 TextStyle newLabelStyle(
-    {Color color,
+    {Color? color,
-    double fontSize,
+    double? fontSize,
-    FontWeight fontWeight,
+    FontWeight? fontWeight,
     bool underline = false}) {
   return TextStyle(
       fontSize: fontSize == null ? 14 : fontSize,
@@ -45,9 +46,9 @@ TextStyle newLabelStyle(
 }
 
 TextStyle newLabelStyleMM(
-    {Color color,
+    {Color? color,
-    double fontSize,
+    double? fontSize,
-    FontWeight fontWeight,
+    FontWeight? fontWeight,
     bool underline = false}) {
   return TextStyle(
       fontSize: fontSize == null ? 13 : fontSize,
@@ -59,8 +60,8 @@ TextStyle newLabelStyleMM(
 
 const TextStyle photoLabelStyle =
     TextStyle(color: Colors.black, fontSize: 13.0);
-const TextStyle photoLabelStyleMM = TextStyle(
+const TextStyle photoLabelStyleMM =
-    color: Colors.black, fontSize: 13.0, fontFamily: "Myanmar3");
+    TextStyle(color: Colors.black, fontSize: 13.0, fontFamily: "Myanmar3");
 const TextStyle textStyle =
     TextStyle(fontSize: 14, color: Colors.black87, fontWeight: FontWeight.w500);
 const TextStyle textStyleOdd = TextStyle(

lib/pages/main/util.dart

@@ -54,7 +54,7 @@ Future<void> showConfirmDialog(
                 FlatButton(
                     color: Colors.grey[300],
                     child: Text(
-                      AppTranslations.of(context).text('btn.cancel'),
+                      AppTranslations.of(context)!.text('btn.cancel'),
                       style: Provider.of<LanguageModel>(context).isEng
                           ? TextStyle()
                           : TextStyle(fontFamily: 'Myanmar3'),
@@ -67,7 +67,7 @@ Future<void> showConfirmDialog(
                 ),
                 FlatButton(
                     color: primaryColor,
-                    child: Text(AppTranslations.of(context).text('btn.ok'),
+                    child: Text(AppTranslations.of(context)!.text('btn.ok'),
                         style: Provider.of<LanguageModel>(context).isEng
                             ? TextStyle(
                                 color: Colors.white,
@@ -367,7 +367,7 @@ Widget fcsButton(BuildContext context, String text,
 }
 
 String getLocalString(BuildContext context, String key) {
-  return AppTranslations.of(context).text(key);
+  return AppTranslations.of(context)!.text(key);
 }
 
 void showToast(GlobalKey key, String text) {

lib/pages/widgets/bottom_widgets.dart

@@ -5,7 +5,7 @@ import 'package:fcs/pages/widgets/local_text.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
-import 'package:flutter_icons/flutter_icons.dart';
+import 'package:flutter_vector_icons/flutter_vector_icons.dart';
 import 'package:provider/provider.dart';
 
 class BottomWidgets extends StatelessWidget {

lib/pages/widgets/defalut_delivery_address.dart

@@ -3,20 +3,20 @@ import 'package:fcs/helpers/theme.dart';
 import 'package:fcs/pages/delivery_address/delivery_address_row.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_icons/flutter_icons.dart';
+import 'package:flutter_vector_icons/flutter_vector_icons.dart';
 
 import 'callbacks.dart';
 import 'display_text.dart';
 import 'local_text.dart';
 
 class DefaultDeliveryAddress extends StatelessWidget {
-  final DeliveryAddress deliveryAddress;
+  final DeliveryAddress? deliveryAddress;
-  final String labelKey;
+  final String? labelKey;
-  final OnTap onTap;
+  final OnTap? onTap;
-  final IconData iconData;
+  final IconData? iconData;
 
   const DefaultDeliveryAddress(
-      {Key key, this.deliveryAddress, this.onTap, this.labelKey, this.iconData})
+      {Key? key, this.deliveryAddress, this.onTap, this.labelKey, this.iconData})
       : super(key: key);
 
   @override
@@ -37,7 +37,7 @@ class DefaultDeliveryAddress extends StatelessWidget {
             onTap == null
                 ? Container()
                 : GestureDetector(
-                    onTap: () => onTap(),
+                    onTap: () => onTap!(),
                     child: Chip(
                         label: LocalText(
                             context, "delivery_address.change_address",
@@ -50,8 +50,8 @@ class DefaultDeliveryAddress extends StatelessWidget {
           child: deliveryAddress == null
               ? Container()
               : DeliveryAddressRow(
-                  key: ValueKey(deliveryAddress.id),
+                  key: ValueKey(deliveryAddress!.id),
-                  deliveryAddress: deliveryAddress),
+                  deliveryAddress: deliveryAddress!),
         ),
       ],
     );

lib/pages/widgets/delivery_address_selection.dart

@@ -10,11 +10,11 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 class DeliveryAddressSelection extends StatefulWidget {
-  final DeliveryAddress deliveryAddress;
+  final DeliveryAddress? deliveryAddress;
-  final User user;
+  final User? user;
 
   const DeliveryAddressSelection({
-    Key key,
+    Key? key,
     this.deliveryAddress,
     this.user,
   }) : super(key: key);
@@ -38,7 +38,7 @@ class _DeliveryAddressSelectionState extends State<DeliveryAddressSelection> {
         Provider.of<DeliveryAddressModel>(context, listen: false);
 
     var deliveryAddresses =
-        await addressModel.getDeliveryAddresses(widget.user.id);
+        await addressModel.getDeliveryAddresses(widget.user!.id);
     setState(() {
       this._deliveryAddresses = deliveryAddresses;
     });
@@ -95,7 +95,7 @@ class _DeliveryAddressSelectionState extends State<DeliveryAddressSelection> {
             padding: const EdgeInsets.all(10.0),
             child: Icon(Icons.check,
                 color: widget.deliveryAddress != null &&
-                        _deliveryAddress.id == widget.deliveryAddress.id
+                        _deliveryAddress.id == widget.deliveryAddress!.id
                     ? primaryColor
                     : Colors.black26),
           ),

lib/pages/widgets/dialog_input.dart

@@ -5,10 +5,10 @@ import 'package:flutter/material.dart';
 import 'local_text.dart';
 
 class DialogInput extends StatefulWidget {
-  final String value;
+  final String? value;
-  final String label;
+  final String? label;
 
-  const DialogInput({Key key, this.label, this.value}) : super(key: key);
+  const DialogInput({Key? key, this.label, this.value}) : super(key: key);
   @override
   _DialogInputState createState() => _DialogInputState();
 }
@@ -24,7 +24,7 @@ class _DialogInputState extends State<DialogInput> {
   void initState() {
     super.initState();
     if (widget.value != null) {
-      _controller.text = widget.value;
+      _controller.text = widget.value!;
       _focusNode.addListener(() {
         if (_focusNode.hasFocus) {
           _controller.selection = TextSelection(
@@ -41,7 +41,7 @@ class _DialogInputState extends State<DialogInput> {
       child: AlertDialog(
         title: LocalText(
           context,
-          widget.label,
+          widget.label!,
           fontSize: 20,
           color: primaryColor,
         ),
@@ -77,7 +77,7 @@ class _DialogInputState extends State<DialogInput> {
                 fontWeight: FontWeight.bold,
               ),
               onPressed: () async {
-                if (!_formKey.currentState.validate()) return;
+                if (!_formKey.currentState!.validate()) return;
                 _save();
               })
         ],

lib/pages/widgets/discount_dropdown.dart

@@ -6,13 +6,13 @@ import 'package:flutter/material.dart';
 import 'local_text.dart';
 
 class DiscountDropdown<T> extends StatelessWidget {
-  final Function(T) callback;
+  final Function(T)? callback;
-  final IconData iconData;
+  final IconData? iconData;
-  final T selectedValue;
+  final T? selectedValue;
-  final List<T> values;
+  final List<T>? values;
 
   const DiscountDropdown(
-      {Key key, this.callback, this.iconData, this.selectedValue, this.values})
+      {Key? key, this.callback, this.iconData, this.selectedValue, this.values})
       : super(key: key);
 
   @override
@@ -46,11 +46,11 @@ class DiscountDropdown<T> extends StatelessWidget {
                     height: 1,
                     color: primaryColor,
                   ),
-                  onChanged: (T newValue) {
+                  onChanged: (T? newValue) {
-                    callback(newValue);
+                    callback!(newValue!);
                   },
                   isExpanded: true,
-                  items: values.map<DropdownMenuItem<T>>((T value) {
+                  items: values!.map<DropdownMenuItem<T>>((T value) {
                     return DropdownMenuItem<T>(
                       value: value,
                       child: Text(value == null ? "" : (value as Discount).code,

lib/pages/widgets/display_image_source.dart

@@ -4,12 +4,12 @@ import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/widgets.dart';
 
 class DisplayImageSource {
-  String url;
+  String? url;
-  File file;
+  File? file;
   DisplayImageSource({this.url, this.file});
 
-  ImageProvider get imageProvider =>
+  ImageProvider? get imageProvider =>
-      file == null ? CachedNetworkImageProvider(url) : FileImage(file);
+      file == null ? CachedNetworkImageProvider(url!) : FileImage(file!);
 
   @override
   bool operator ==(other) {

lib/pages/widgets/display_text.dart

@@ -62,7 +62,7 @@ class DisplayText extends StatelessWidget {
                 labelTextKey == null
                     ? Container()
                     : Text(
-                        AppTranslations.of(context).text(labelTextKey!),
+                        AppTranslations.of(context)!.text(labelTextKey!),
                         style: labelStyle,
                       ),
                 text == null

lib/pages/widgets/fcs_expansion_tile.dart

@@ -5,10 +5,10 @@ import 'package:flutter/material.dart';
 import 'callbacks.dart';
 
 class FcsExpansionTile extends StatefulWidget {
-  final ValueChanged<bool> onExpansionChanged;
+  final ValueChanged<bool>? onExpansionChanged;
-  final CallBack onEditPress;
+  final CallBack? onEditPress;
-  final List<Widget> children;
+  final List<Widget>? children;
-  final Widget title;
+  final Widget? title;
   final bool isEdit;
   const FcsExpansionTile(
       {this.onExpansionChanged,
@@ -21,7 +21,7 @@ class FcsExpansionTile extends StatefulWidget {
 }
 
 class _FcsExpansionTileState extends State<FcsExpansionTile> {
-  bool expanded;
+  bool? expanded;
   @override
   void initState() {
     this.expanded = false;
@@ -39,22 +39,22 @@ class _FcsExpansionTileState extends State<FcsExpansionTile> {
             expanded = value;
           });
           if (widget.onExpansionChanged != null)
-            widget.onExpansionChanged(value);
+            widget.onExpansionChanged!(value);
         },
-        title: widget.title,
+        title: widget.title != null ? widget.title! : Container(),
-        children: widget.children,
+        children: widget.children != null ? widget.children! : [Container()],
         trailing: widget.isEdit
             ? IconButton(
                 padding: EdgeInsets.all(0),
                 iconSize: 20,
                 onPressed: () =>
-                    widget.onEditPress != null ? widget.onEditPress() : {},
+                    widget.onEditPress != null ? widget.onEditPress!() : {},
                 icon: Icon(
                   Icons.edit,
                   color: primaryColor,
                 ))
             : AnimatedSwitcher(
-                child: expanded
+                child: expanded!
                     ? Icon(
                         Icons.remove,
                         color: primaryColor,

lib/pages/widgets/fcs_icons.dart

@@ -1,4 +1,4 @@
-import 'package:flutter_icons/flutter_icons.dart';
+import 'package:flutter_vector_icons/flutter_vector_icons.dart';
 
 const cartonIconData = MaterialCommunityIcons.package;
 const customFeeIconData = MaterialCommunityIcons.security;

lib/pages/widgets/image_file_picker.dart

@@ -1,7 +1,7 @@
 import 'dart:io';
 
 import 'package:flutter/material.dart';
-import 'package:flutter_icons/flutter_icons.dart';
+import 'package:flutter_vector_icons/flutter_vector_icons.dart';
 import 'package:image_picker/image_picker.dart';
 import 'local_text.dart';
 
@@ -18,15 +18,15 @@ modelBottomSheet(BuildContext context, {final OnFile onFile}) {
 }
 
 class ImageFile extends StatefulWidget {
-  final OnFile onFile;
+  final OnFile? onFile;
 
-  const ImageFile({Key key, this.onFile}) : super(key: key);
+  const ImageFile({Key? key, this.onFile}) : super(key: key);
   @override
   _ImageFileState createState() => _ImageFileState();
 }
 
 class _ImageFileState extends State<ImageFile> {
-  File selectedFile;
+  File? selectedFile;
   @override
   Widget build(BuildContext context) {
     return Container(
@@ -44,7 +44,7 @@ class _ImageFileState extends State<ImageFile> {
               onTap: () async {
                 Navigator.pop(context);
                 selectedFile = await pickImage(ImageSource.gallery);
-                if (widget.onFile != null) widget.onFile(selectedFile);
+                if (widget.onFile != null) widget.onFile!(selectedFile!);
               }),
           new ListTile(
             leading: CircleAvatar(
@@ -58,7 +58,7 @@ class _ImageFileState extends State<ImageFile> {
               Navigator.pop(context);
               selectedFile = await pickImage(ImageSource.camera);
 
-              if (widget.onFile != null) widget.onFile(selectedFile);
+              if (widget.onFile != null) widget.onFile!(selectedFile!);
             },
           ),
           new ListTile(
@@ -75,7 +75,7 @@ class _ImageFileState extends State<ImageFile> {
                 selectedFile = null;
               });
 
-              if (widget.onFile != null) widget.onFile(selectedFile);
+              if (widget.onFile != null) widget.onFile!(selectedFile!);
             },
           ),
         ],

lib/pages/widgets/img_url.dart

@@ -8,10 +8,10 @@ import 'show_img.dart';
 typedef OnFile = void Function(File);
 
 class ImageUrl extends StatefulWidget {
-  final String title;
+  final String? title;
-  final String url;
+  final String? url;
 
-  const ImageUrl({Key key, this.title, this.url}) : super(key: key);
+  const ImageUrl({Key? key, this.title, this.url}) : super(key: key);
   @override
   _ImageUrlState createState() => _ImageUrlState();
 }
@@ -25,12 +25,12 @@ class _ImageUrlState extends State<ImageUrl> {
           context,
           MaterialPageRoute(
               builder: (context) =>
-                  ShowImage(url: widget.url, fileName: widget.title)),
+                  ShowImage(url: widget.url!, fileName: widget.title!)),
         )
       },
       child: Chip(
         avatar: Icon(Icons.image),
-        label: Text(widget.title),
+        label: Text(widget.title!),
       ),
     );
   }

lib/pages/widgets/input_date.dart

@@ -10,19 +10,19 @@ class InputDate extends StatelessWidget {
   final String labelTextKey;
   final IconData iconData;
   final TextEditingController controller;
-  final FormFieldValidator<String> validator;
+  final FormFieldValidator<String>? validator;
   final int maxLines;
   final bool withBorder;
-  final Color borderColor;
+  final Color? borderColor;
-  final TextInputType textInputType;
+  final TextInputType? textInputType;
   final bool autoFocus;
   final String dateFormatString;
 
   const InputDate(
-      {Key key,
+      {Key? key,
-      this.labelTextKey,
+      required this.labelTextKey,
-      this.iconData,
+      required this.iconData,
-      this.controller,
+      required this.controller,
       this.validator,
       this.maxLines = 1,
       this.withBorder = false,
@@ -72,7 +72,7 @@ class InputDate extends StatelessWidget {
             ),
             labelText: labelTextKey == null
                 ? null
-                : AppTranslations.of(context).text(labelTextKey),
+                : AppTranslations.of(context)!.text(labelTextKey),
             labelStyle: languageModel.isEng
                 ? newLabelStyle(color: Colors.black54, fontSize: 20)
                 : newLabelStyleMM(color: Colors.black54, fontSize: 20),

lib/pages/widgets/input_text.dart

@@ -6,20 +6,20 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 class InputText extends StatelessWidget {
-  final String labelTextKey;
+  final String? labelTextKey;
-  final IconData iconData;
+  final IconData? iconData;
-  final TextEditingController controller;
+  final TextEditingController? controller;
-  final FormFieldValidator<String> validator;
+  final FormFieldValidator<String>? validator;
   final int maxLines;
   final bool withBorder;
-  final Color borderColor;
+  final Color? borderColor;
-  final TextInputType textInputType;
+  final TextInputType? textInputType;
   final bool autoFocus;
   final TextAlign textAlign;
   final bool enabled;
 
   const InputText(
-      {Key key,
+      {Key? key,
       this.labelTextKey,
       this.iconData,
       this.controller,
@@ -30,7 +30,7 @@ class InputText extends StatelessWidget {
       this.autoFocus = false,
       this.textInputType,
       this.enabled = true,
-      this.textAlign})
+      this.textAlign = TextAlign.start})
       : super(key: key);
   @override
   Widget build(BuildContext context) {
@@ -46,7 +46,7 @@ class InputText extends StatelessWidget {
           style: textStyle,
           maxLines: maxLines,
           keyboardType: textInputType,
-          textAlign: textAlign ?? TextAlign.start,
+          textAlign: textAlign,
           decoration: new InputDecoration(
             // hintText: '',
             hintStyle: TextStyle(
@@ -54,7 +54,7 @@ class InputText extends StatelessWidget {
             ),
             labelText: labelTextKey == null
                 ? null
-                : AppTranslations.of(context).text(labelTextKey),
+                : AppTranslations.of(context)!.text(labelTextKey!),
             labelStyle: languageModel.isEng
                 ? newLabelStyle(color: Colors.black54, fontSize: 20)
                 : newLabelStyleMM(color: Colors.black54, fontSize: 20),

lib/pages/widgets/input_time.dart

@@ -7,18 +7,18 @@ import 'package:intl/intl.dart';
 import 'package:provider/provider.dart';
 
 class InputTime extends StatelessWidget {
-  final String labelTextKey;
+  final String? labelTextKey;
-  final IconData iconData;
+  final IconData? iconData;
-  final TextEditingController controller;
+  final TextEditingController? controller;
-  final FormFieldValidator<String> validator;
+  final FormFieldValidator<String>? validator;
   final int maxLines;
   final bool withBorder;
-  final Color borderColor;
+  final Color? borderColor;
-  final TextInputType textInputType;
+  final TextInputType? textInputType;
   final bool autoFocus;
 
   const InputTime(
-      {Key key,
+      {Key? key,
       this.labelTextKey,
       this.iconData,
       this.controller,
@@ -45,14 +45,14 @@ class InputTime extends StatelessWidget {
               try {
                 final format = DateFormat.jm(); //"6:00 AM"
                 initialDate =
-                    TimeOfDay.fromDateTime(format.parse(controller.text));
+                    TimeOfDay.fromDateTime(format.parse(controller!.text));
                 // var values = controller.text.split(":");
                 // initialDate = TimeOfDay(
                 //     hour: int.parse(values[0]), minute: int.parse(values[1]));
               } catch (e) {} // ignore error
             }
 
-            TimeOfDay t = await showTimePicker(
+            TimeOfDay? t = await showTimePicker(
               initialTime: initialDate,
               context: context,
             );
@@ -61,7 +61,7 @@ class InputTime extends StatelessWidget {
               final now = new DateTime.now();
               final dt =
                   DateTime(now.year, now.month, now.day, t.hour, t.minute);
-              controller.text = "${format.format(dt)}";
+              controller!.text = "${format.format(dt)}";
             }
           },
           controller: controller,
@@ -77,7 +77,7 @@ class InputTime extends StatelessWidget {
             ),
             labelText: labelTextKey == null
                 ? null
-                : AppTranslations.of(context).text(labelTextKey),
+                : AppTranslations.of(context)!.text(labelTextKey!),
             labelStyle: languageModel.isEng
                 ? newLabelStyle(color: Colors.black54, fontSize: 20)
                 : newLabelStyleMM(color: Colors.black54, fontSize: 20),

lib/pages/widgets/length_picker.dart

@@ -10,13 +10,13 @@ const MAX_INC = 50.0;
 const MAX_FEET = 25.0;
 
 class LengthPicker extends StatefulWidget {
-  final TextEditingController controller;
+  final TextEditingController? controller;
-  final String lableKey;
+  final String? lableKey;
   final bool isReadOnly;
   final bool displayFeet;
 
   const LengthPicker(
-      {Key key,
+      {Key? key,
       this.controller,
       this.lableKey,
       this.isReadOnly = false,
@@ -35,14 +35,14 @@ class _LengthPickerState extends State<LengthPicker> {
     super.initState();
     if (widget.controller != null) {
       _setText();
-      widget.controller.addListener(() {
+      widget.controller!.addListener(() {
         _setText();
       });
     }
   }
 
   _setText() {
-    double v = double.parse(widget.controller.text, (s) => 0);
+    double v = double.parse(widget.controller!.text, (s) => 0);
     int _v = v.toInt();
 
     int f = (v / 12).floor();
@@ -72,8 +72,8 @@ class _LengthPickerState extends State<LengthPicker> {
       context: context,
       builder: (BuildContext context) {
         return LengthPickerDialog(
-          controller: widget.controller,
+          controller: widget.controller!,
-          labelKey: widget.lableKey,
+          labelKey: widget.lableKey!,
           displayFeet: widget.displayFeet,
         );
       },
@@ -82,12 +82,12 @@ class _LengthPickerState extends State<LengthPicker> {
 }
 
 class LengthPickerDialog extends StatefulWidget {
-  final TextEditingController controller;
+  final TextEditingController? controller;
-  final String labelKey;
+  final String? labelKey;
-  final bool displayFeet;
+  final bool? displayFeet;
 
   const LengthPickerDialog(
-      {Key key, this.controller, this.labelKey, this.displayFeet})
+      {Key? key, this.controller, this.labelKey, this.displayFeet})
       : super(key: key);
 
   @override
@@ -95,8 +95,8 @@ class LengthPickerDialog extends StatefulWidget {
 }
 
 class _LengthPickerDialogState extends State<LengthPickerDialog> {
-  int _valueFeet;
+  late int _valueFeet;
-  int _valueInc;
+  late int _valueInc;
   TextEditingController inchInputController = TextEditingController();
   TextEditingController feetInputController = TextEditingController();
   final _focusNode = FocusNode();
@@ -107,9 +107,9 @@ class _LengthPickerDialogState extends State<LengthPickerDialog> {
     _valueFeet = 0;
     _valueInc = 0;
     if (widget.controller != null) {
-      double v = double.parse(widget.controller.text, (s) => 0);
+      double v = double.parse(widget.controller!.text, (s) => 0);
       _valueFeet = (v / 12).floor();
-      _valueInc = widget.displayFeet ? (v % 12).toInt() : v.toInt();
+      _valueInc = widget.displayFeet! ? (v % 12).toInt() : v.toInt();
       inchInputController.text = _valueInc.toString();
       feetInputController.text = _valueFeet.toString();
     }
@@ -144,7 +144,7 @@ class _LengthPickerDialogState extends State<LengthPickerDialog> {
                     borderSide: BorderSide(color: primaryColor, width: 1.0),
                   ),
                   enabledBorder: OutlineInputBorder(
-                    borderSide: BorderSide(color: Colors.grey[400], width: 1.0),
+                    borderSide: BorderSide(color: Colors.grey.shade400, width: 1.0),
                   ),
                 ),
               ),
@@ -196,7 +196,7 @@ class _LengthPickerDialogState extends State<LengthPickerDialog> {
                     borderSide: BorderSide(color: primaryColor, width: 1.0),
                   ),
                   enabledBorder: OutlineInputBorder(
-                    borderSide: BorderSide(color: Colors.grey[400], width: 1.0),
+                    borderSide: BorderSide(color: Colors.grey.shade400, width: 1.0),
                   ),
                 ),
               ),
@@ -233,14 +233,14 @@ class _LengthPickerDialogState extends State<LengthPickerDialog> {
       title: Center(
           child: LocalText(
         context,
-        widget.labelKey,
+        widget.labelKey!,
         color: primaryColor,
         fontSize: 16,
       )),
       children: [
         Row(
           mainAxisAlignment: MainAxisAlignment.spaceAround,
-          children: widget.displayFeet
+          children: widget.displayFeet!
               ? [
                   Container(width: 100, child: feetBox),
                   Container(width: 100, child: inchBox),
@@ -252,7 +252,7 @@ class _LengthPickerDialogState extends State<LengthPickerDialog> {
         SizedBox(
           height: 10,
         ),
-        widget.displayFeet
+        widget.displayFeet!
             ? Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
@@ -295,11 +295,11 @@ class _LengthPickerDialogState extends State<LengthPickerDialog> {
             ),
             Slider(
               activeColor: primaryColor,
-              value: _valueInc.toDouble() > (widget.displayFeet ? 11 : MAX_INC)
+              value: _valueInc.toDouble() > (widget.displayFeet! ? 11 : MAX_INC)
                   ? 0
                   : _valueInc.toDouble(),
               min: 0,
-              max: widget.displayFeet ? 11 : MAX_INC,
+              max: widget.displayFeet! ? 11 : MAX_INC,
               divisions: 100,
               label: (_valueInc ?? 0).round().toString(),
               onChanged: (double v) {
@@ -318,10 +318,10 @@ class _LengthPickerDialogState extends State<LengthPickerDialog> {
     });
     int _v = _valueInc.round() + _valueFeet.round() * 12;
     if (widget.controller != null) {
-      widget.controller.text = _v.toString();
+      widget.controller!.text = _v.toString();
     }
     feetInputController.text =
-        widget.displayFeet ? _valueFeet.round().toString() : _v.toString();
+        widget.displayFeet! ? _valueFeet.round().toString() : _v.toString();
   }
 
   _updateInc(double v) {
@@ -330,8 +330,8 @@ class _LengthPickerDialogState extends State<LengthPickerDialog> {
     });
     int _v = _valueInc.round() + _valueFeet.round() * 12;
     if (widget.controller != null) {
-      widget.controller.text =
+      widget.controller!.text =
-          widget.displayFeet ? _v.toString() : _valueInc.toString();
+          widget.displayFeet! ? _v.toString() : _valueInc.toString();
     }
     inchInputController.text = _valueInc.toString();
   }
@@ -343,8 +343,8 @@ class _LengthPickerDialogState extends State<LengthPickerDialog> {
     });
     int _v = _valueInc.round() + _valueFeet.round() * 12;
     if (widget.controller != null) {
-      widget.controller.text =
+      widget.controller!.text =
-          widget.displayFeet ? _v.toString() : _valueInc.toString();
+          widget.displayFeet! ? _v.toString() : _valueInc.toString();
     }
   }
 
@@ -355,7 +355,7 @@ class _LengthPickerDialogState extends State<LengthPickerDialog> {
     });
     int _v = _valueInc.round() + _valueFeet.round() * 12;
     if (widget.controller != null) {
-      widget.controller.text = _v.toString();
+      widget.controller!.text = _v.toString();
     }
   }
 

lib/pages/widgets/local_button.dart

@@ -6,13 +6,13 @@ import 'package:flutter/material.dart';
 import 'callbacks.dart';
 
 class LocalButton extends StatelessWidget {
-  final CallBack callBack;
+  final CallBack? callBack;
-  final IconData iconData;
+  final IconData? iconData;
-  final String textKey;
+  final String? textKey;
-  final Color color;
+  final Color? color;
 
   const LocalButton(
-      {Key key,
+      {Key? key,
       this.callBack,
       this.iconData,
       this.textKey,
@@ -33,7 +33,7 @@ class LocalButton extends StatelessWidget {
           minWidth: 900.0,
           height: 100.0,
           child: FlatButton(
-            onPressed: callBack == null ? null : () => callBack(),
+            onPressed: callBack == null ? null : () => callBack!(),
             child: Row(
               mainAxisAlignment: MainAxisAlignment.center,
               children: [
@@ -48,7 +48,7 @@ class LocalButton extends StatelessWidget {
                 ),
                 LocalText(
                   context,
-                  textKey,
+                  textKey!,
                   color: Colors.white,
                   fontSize: 16,
                 ),

lib/pages/widgets/local_dropdown.dart

@@ -5,15 +5,15 @@ import 'package:flutter/material.dart';
 import 'local_text.dart';
 
 class LocalDropdown<T> extends StatelessWidget {
-  final Function(T) callback;
+  final Function(T)? callback;
-  final IconData iconData;
+  final IconData? iconData;
-  final T selectedValue;
+  final T? selectedValue;
-  final List<T> values;
+  final List<T>? values;
-  final Function(T) display;
+  final Function(T)? display;
-  final String labelKey;
+  final String? labelKey;
 
   const LocalDropdown(
-      {Key key,
+      {Key? key,
       this.callback,
       this.iconData,
       this.selectedValue,
@@ -40,7 +40,7 @@ class LocalDropdown<T> extends StatelessWidget {
                   padding: const EdgeInsets.only(right: 18.0),
                   child: LocalText(
                     context,
-                    labelKey,
+                    labelKey!,
                     color: Colors.black54,
                     fontSize: 16,
                   ),
@@ -53,20 +53,20 @@ class LocalDropdown<T> extends StatelessWidget {
                     height: 1,
                     color: Colors.grey,
                   ),
-                  onChanged: (T newValue) {
+                  onChanged: (T? newValue) {
-                    callback(newValue);
+                    callback!(newValue!);
                   },
                   isExpanded: true,
                   items: values == null
                       ? []
-                      : values.map<DropdownMenuItem<T>>((T value) {
+                      : values!.map<DropdownMenuItem<T>>((T value) {
                           return DropdownMenuItem<T>(
                             value: value,
                             child: Text(
                                 value == null
                                     ? ""
                                     : display != null
-                                        ? display(value)
+                                        ? display!(value)
                                         : value.toString(),
                                 overflow: TextOverflow.ellipsis,
                                 style: TextStyle(color: primaryColor)),

lib/pages/widgets/local_popup_menu_button.dart

@@ -7,15 +7,15 @@ import 'local_popupmenu.dart';
 typedef PopupMenuCallback = Function(LocalPopupMenu popupMenu);
 
 class LocalPopupMenuButton extends StatefulWidget {
-  final PopupMenuCallback popupMenuCallback;
+  final PopupMenuCallback? popupMenuCallback;
-  final List<LocalPopupMenu> popmenus;
+  final List<LocalPopupMenu>? popmenus;
   final bool multiSelect;
   final bool selectable;
-  final IconData buttonIcon;
+  final IconData? buttonIcon;
   final Color buttonColor;
 
   const LocalPopupMenuButton(
-      {Key key,
+      {Key? key,
       this.popupMenuCallback,
       this.popmenus,
       this.buttonIcon,
@@ -29,11 +29,11 @@ class LocalPopupMenuButton extends StatefulWidget {
 }
 
 class _LocalPopupMenuButtonState extends State<LocalPopupMenuButton> {
-  List<LocalPopupMenu> popmenus;
+  late List<LocalPopupMenu> popmenus;
 
   @override
   void initState() {
-    popmenus = widget.popmenus;
+    popmenus = widget.popmenus!;
     super.initState();
   }
 
@@ -64,7 +64,7 @@ class _LocalPopupMenuButtonState extends State<LocalPopupMenuButton> {
             }
           }
           if (selected.enabled && widget.popupMenuCallback != null)
-            widget.popupMenuCallback(selected);
+            widget.popupMenuCallback!(selected);
         },
         icon: Container(
             width: 30,

lib/pages/widgets/local_popupmenu.dart

@@ -1,11 +1,11 @@
 class LocalPopupMenu {
   int id;
-  String textKey;
+  String? textKey;
   bool selected;
   bool highlight;
   bool enabled;
   LocalPopupMenu(
-      {this.id,
+      {required this.id,
       this.textKey,
       this.selected = false,
       this.highlight = false,

lib/pages/widgets/local_radio_buttons.dart

@@ -3,15 +3,15 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 
 class LocalRadioButtons<T> extends StatelessWidget {
-  final Function(T) callback;
+  final Function(T)? callback;
-  final IconData iconData;
+  final IconData? iconData;
-  final T selectedValue;
+  final T? selectedValue;
-  final List<T> values;
+  final List<T>? values;
   final bool readOnly;
   final bool hideUnselected;
 
   const LocalRadioButtons(
-      {Key key,
+      {Key? key,
       this.callback,
       this.iconData,
       this.selectedValue,
@@ -26,19 +26,19 @@ class LocalRadioButtons<T> extends StatelessWidget {
   }
 
   List<Widget> getChildren() {
-    return values
+    return values!
         .toList()
         .map((e) => SizedBox(
             height: 30,
             child: InkWell(
-              onTap: () => callback(e),
+              onTap: () => callback!(e),
               child: Row(children: <Widget>[
                 Radio<T>(
                   activeColor: primaryColor,
                   groupValue: selectedValue,
                   value: e,
-                  onChanged: (T value) {
+                  onChanged: (T? value) {
-                    callback(value);
+                    callback!(value!);
                   },
                 ),
                 Text(e.toString()),
@@ -48,7 +48,7 @@ class LocalRadioButtons<T> extends StatelessWidget {
   }
 
   List<Widget> getReadonlyChildren() {
-    return values
+    return values!
         .toList()
         .map((e) => hideUnselected && e == selectedValue
             ? SizedBox(

lib/pages/widgets/local_text.dart

@@ -7,26 +7,26 @@ import 'package:fcs/helpers/theme.dart';
 class LocalText extends Text {
   final BuildContext context;
   LocalText(this.context, String translationKey,
-      {Color color,
+      {Color? color,
-      double fontSize,
+      double? fontSize,
-      FontWeight fontWeight,
+      FontWeight? fontWeight,
-      List<String> translationVariables,
+      List<String>? translationVariables,
-      String text,
+      String? text,
       bool underline = false})
       : super(
             text ??
-                AppTranslations.of(context).text(translationKey,
+                AppTranslations.of(context)!.text(translationKey,
                     translationVariables: translationVariables),
             style: Provider.of<LanguageModel>(context, listen: false).isEng
                 ? newLabelStyle(
-                    color: color,
+                    color: color!,
-                    fontSize: fontSize,
+                    fontSize: fontSize!,
-                    fontWeight: fontWeight,
+                    fontWeight: fontWeight!,
                     underline: underline)
                 : newLabelStyleMM(
-                    color: color,
+                    color: color!,
-                    fontSize: fontSize,
+                    fontSize: fontSize!,
-                    fontWeight: fontWeight,
+                    fontWeight: fontWeight!,
                     underline: underline));
 }
 
@@ -35,10 +35,10 @@ class LocalLargeTitle extends Text {
   LocalLargeTitle(
     this.context,
     String translationKey, {
-    Color color,
+    Color? color,
-    List<String> translationVariables,
+    List<String>? translationVariables,
   }) : super(
-            AppTranslations.of(context).text(translationKey,
+            AppTranslations.of(context)!.text(translationKey,
                 translationVariables: translationVariables),
             style: Provider.of<LanguageModel>(context).isEng
                 ? TextStyle(color: color)
@@ -48,7 +48,7 @@ class LocalLargeTitle extends Text {
 class TextLocalStyle extends Text {
   final BuildContext context;
   TextLocalStyle(this.context, String text,
-      {Color color, double fontSize, FontWeight fontWeight})
+      {Color? color, double? fontSize, FontWeight? fontWeight})
       : super(text,
             style: Provider.of<LanguageModel>(context).isEng
                 ? TextStyle(

lib/pages/widgets/local_title.dart

@@ -4,10 +4,10 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 
 class LocalTitle extends StatelessWidget {
-  final String textKey;
+  final String? textKey;
-  final Widget trailing;
+  final Widget? trailing;
 
-  const LocalTitle({Key key, this.textKey, this.trailing}) : super(key: key);
+  const LocalTitle({Key? key, this.textKey, this.trailing}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -20,13 +20,13 @@ class LocalTitle extends StatelessWidget {
             children: [
               LocalText(
                 context,
-                textKey,
+                textKey!,
                 fontSize: 20,
                 fontWeight: FontWeight.bold,
                 color: primaryColor,
               ),
               trailing != null ? Spacer() : Container(),
-              trailing != null ? trailing : Container()
+              trailing != null ? trailing! : Container()
             ],
           ),
         ),

lib/pages/widgets/multi_img_controller.dart

@@ -79,16 +79,16 @@ class MultiImgController {
   }
 
   List<File> get getUpdatedFile {
-    List<File> _addfiles = getAddedFile;
+    List<File?> _addfiles = getAddedFile;
     this.imageFiles.addAll(_addfiles);
     return this.imageFiles;
   }
 
-  List<File> get getAddedFile {
+  List<File?> get getAddedFile {
     return addedFiles.map((e) => e.file).toList();
   }
 
-  List<String> get getDeletedUrl {
+  List<String?> get getDeletedUrl {
     return removedFiles.map((e) => e.url).toList();
   }
 }

lib/pages/widgets/multi_img_file.dart

@@ -8,7 +8,7 @@ import 'package:fcs/pages/widgets/show_img.dart';
 import 'package:fcs/pages/widgets/show_multiple_img.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_icons/flutter_icons.dart';
+import 'package:flutter_vector_icons/flutter_vector_icons.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 import 'package:image_picker/image_picker.dart';
 
@@ -18,13 +18,13 @@ import 'multi_img_controller.dart';
 typedef OnFile = void Function(File);
 
 class MultiImageFile extends StatefulWidget {
-  final String title;
+  final String? title;
   final bool enabled;
   final ImageSource imageSource;
-  final MultiImgController controller;
+  final MultiImgController? controller;
 
   const MultiImageFile(
-      {Key key,
+      {Key? key,
       this.title,
       this.enabled = true,
       this.controller,
@@ -39,10 +39,10 @@ class _MultiImageFileState extends State<MultiImageFile> {
   @override
   void initState() {
     super.initState();
-    fileContainers = widget.controller.fileContainers;
+    fileContainers = widget.controller!.fileContainers;
-    widget.controller.onChange(() {
+    widget.controller!.onChange(() {
       setState(() {
-        this.fileContainers = widget.controller.fileContainers;
+        this.fileContainers = widget.controller!.fileContainers;
       });
     });
   }
@@ -133,7 +133,7 @@ class _MultiImageFileState extends State<MultiImageFile> {
                               fit: BoxFit.cover,
                               width: 50,
                               height: 50,
-                              imageUrl: fileContainers[index].url,
+                              imageUrl: fileContainers[index].url!,
                               placeholder: (context, url) => Column(
                                 mainAxisAlignment: MainAxisAlignment.center,
                                 mainAxisSize: MainAxisSize.min,
@@ -150,7 +150,7 @@ class _MultiImageFileState extends State<MultiImageFile> {
                           : FittedBox(
                               fit: BoxFit.cover,
                               child: Image.file(
-                                fileContainers[index].file,
+                                fileContainers[index].file!,
                               ),
                             ),
                     ),
@@ -189,13 +189,13 @@ class _MultiImageFileState extends State<MultiImageFile> {
     fileContainer.file = selectedFile;
     setState(() {
       fileContainers.add(fileContainer);
-      widget.controller.addFile = fileContainer;
+      widget.controller!.addFile = fileContainer;
     });
   }
 
   _fileRemove(DisplayImageSource fileContainer) {
     setState(() {
-      widget.controller.removeFile = fileContainer;
+      widget.controller!.removeFile = fileContainer;
     });
   }
 
@@ -232,11 +232,11 @@ class _MultiImageFileState extends State<MultiImageFile> {
                     context,
                     MaterialPageRoute(
                         builder: (context) => ShowImage(
-                            imageFile: fileContainer.file,
+                            imageFile: fileContainer.file!,
                             url: fileContainer.file == null
-                                ? fileContainer.url
+                                ? fileContainer.url!
-                                : null,
+                                : '',
-                            fileName: widget.title)),
+                            fileName: widget.title!)),
                   )
                 },
                 child: Chip(
@@ -249,7 +249,7 @@ class _MultiImageFileState extends State<MultiImageFile> {
                   deleteIcon: Icon(
                     Icons.close,
                   ),
-                  label: Text(widget.title + " - ${index + 1}"),
+                  label: Text("${widget.title}" + " - ${index + 1}"),
                 ),
               ),
             ),
@@ -308,7 +308,7 @@ class _MultiImageFileState extends State<MultiImageFile> {
     );
   }
 
-  Widget actionIcon({OnTap onTap, Color color, IconData iconData}) {
+  Widget actionIcon({OnTap? onTap, Color? color, IconData? iconData}) {
     return InkWell(
       onTap: onTap,
       child: ClipOval(

lib/pages/widgets/number_cell.dart

@@ -5,9 +5,9 @@ import 'package:fcs/helpers/theme.dart' as theme;
 class NumberCell extends StatelessWidget {
   final int number;
   final numberFormatter;
-  final TextStyle textStyle;
+  final TextStyle? textStyle;
 
-  NumberCell(this.number, {Key key, this.textStyle})
+  NumberCell(this.number, {Key? key, this.textStyle})
       : numberFormatter = new NumberFormat("#,###"),
         super(key: key);
 

lib/pages/widgets/offline_redirect.dart

@@ -6,14 +6,14 @@ import 'package:provider/provider.dart';
 
 class OfflineRedirect extends StatefulWidget {
   final Widget child;
-  OfflineRedirect({@required this.child});
+  OfflineRedirect({required this.child});
 
   @override
   _OfflineRedirectState createState() => _OfflineRedirectState();
 }
 
 class _OfflineRedirectState extends State<OfflineRedirect> {
-  Timer offlineTimer;
+  Timer? offlineTimer;
 
   @override
   void initState() {
@@ -27,7 +27,7 @@ class _OfflineRedirectState extends State<OfflineRedirect> {
   }
 
   _startOfflineTimer() async {
-    if (offlineTimer != null && offlineTimer.isActive) return;
+    if (offlineTimer != null && offlineTimer!.isActive) return;
     var _duration = new Duration(milliseconds: 500);
     this.offlineTimer = new Timer.periodic(_duration, offlineNav);
   }
@@ -41,7 +41,7 @@ class _OfflineRedirectState extends State<OfflineRedirect> {
   }
 
   void dispose() {
-    offlineTimer.cancel();
+    offlineTimer!.cancel();
     super.dispose();
   }
 

lib/pages/widgets/pdf_screen.dart

@@ -11,10 +11,10 @@ import 'package:flutter_pdfview/flutter_pdfview.dart';
 import 'package:share/share.dart';
 
 class PDFScreen extends StatefulWidget {
-  final String title;
+  final String? title;
-  final String url;
+  final String? url;
 
-  PDFScreen({Key key, this.url, this.title}) : super(key: key);
+  PDFScreen({Key? key, this.url, this.title}) : super(key: key);
 
   _PDFScreenState createState() => _PDFScreenState();
 }
@@ -33,10 +33,10 @@ class _PDFScreenState extends State<PDFScreen> with WidgetsBindingObserver {
     download();
   }
 
-  File file;
+  File? file;
   Future<void> download() async {
     try {
-      File f = await PdfCacheMgr.pdfs.getSingleFile(widget.url);
+      File f = await PdfCacheMgr.pdfs.getSingleFile(widget.url!);
       setState(() {
         file = f;
       });
@@ -89,23 +89,23 @@ class _PDFScreenState extends State<PDFScreen> with WidgetsBindingObserver {
                     fitPolicy: FitPolicy.BOTH,
                     preventLinkNavigation:
                         false, // if set to true the link is handled in flutter
-                    onRender: (_pages) {
+                    onRender: (int?_pages) {
                       print(('pages => $pages'));
                       setState(() {
-                        pages = _pages;
+                        pages = _pages!;
                         isReady = true;
                       });
                     },
                     onViewCreated: (PDFViewController pdfViewController) {
                       _controller.complete(pdfViewController);
                     },
-                    onLinkHandler: (String uri) {
+                    onLinkHandler: (String? uri) {
                       print('goto uri: $uri');
                     },
-                    onPageChanged: (int page, int total) {
+                    onPageChanged: (int? page, int? total) {
                       print('page change: $page/$total');
                       setState(() {
-                        currentPage = page;
+                        currentPage = page!;
                       });
                     },
                   ),
@@ -116,8 +116,8 @@ class _PDFScreenState extends State<PDFScreen> with WidgetsBindingObserver {
   }
 
   _share() async {
-    final RenderBox box = context.findRenderObject();
+    final RenderBox box = context.findRenderObject() as RenderBox;
-    await Share.shareFiles([file.path],
+    await Share.shareFiles([file!.path],
         mimeTypes: ["application/pdf"],
         subject: "File",
         sharePositionOrigin: box.localToGlobal(Offset.zero) & box.size);

lib/pages/widgets/popupmenu.dart

@@ -1,7 +1,7 @@
 class PopupMenu {
   int id;
   String status;
-  PopupMenu({this.id, this.status});
+  PopupMenu({required this.id, required this.status});
 }
 
 List<PopupMenu> menuPopup = <PopupMenu>[

lib/pages/widgets/progress.dart

@@ -4,7 +4,7 @@ import 'package:provider/provider.dart';
 import 'package:fcs/helpers/theme.dart';
 
 class LocalProgress extends Progress {
-  LocalProgress({bool inAsyncCall, Widget child})
+  LocalProgress({required bool inAsyncCall, required Widget child})
       : super(
             inAsyncCall: inAsyncCall,
             child: child,

lib/pages/widgets/show_img.dart

@@ -6,12 +6,12 @@ import 'package:flutter/material.dart';
 import 'package:photo_view/photo_view.dart';
 
 class ShowImage extends StatefulWidget {
-  final String url;
+  final String? url;
-  final File imageFile;
+  final File? imageFile;
-  final String fileName;
+  final String? fileName;
-  final String localImage;
+  final String? localImage;
   const ShowImage(
-      {Key key, this.imageFile, this.fileName, this.url, this.localImage})
+      {Key? key, this.imageFile, this.fileName, this.url, this.localImage})
       : super(key: key);
   @override
   _ShowImageState createState() => _ShowImageState();
@@ -20,6 +20,13 @@ class ShowImage extends StatefulWidget {
 class _ShowImageState extends State<ShowImage> {
   @override
   Widget build(BuildContext context) {
+    final ImageProvider<Object>? p;
+    if (widget.imageFile != null) {
+      p = FileImage(widget.imageFile!);
+    } else {
+      p = AssetImage(widget.localImage!);
+    }
+
     return Scaffold(
       appBar: AppBar(
         leading: new IconButton(
@@ -35,11 +42,7 @@ class _ShowImageState extends State<ShowImage> {
               backgroundDecoration: const BoxDecoration(
                 color: primaryColor,
               ),
-              imageProvider: widget.url != null
+              imageProvider: widget.url != null ? NetworkImage(widget.url!) : p,
-                  ? NetworkImage(widget.url)
-                  : widget.imageFile != null
-                      ? FileImage(widget.imageFile)
-                      : AssetImage(widget.localImage),
               minScale: PhotoViewComputedScale.contained * 1)),
     );
   }

pubspec.yaml

@@ -43,7 +43,7 @@ dependencies:
   permission_handler: ^8.1.4+2
   country_code_picker: ^2.0.2
   pin_input_text_field: ^4.1.0
-  # flutter_icons: ^1.1.0
+  flutter_icons_null_safety: ^1.1.0
   country_icons: ^2.0.2
   timeline_list: ^0.0.5
   # barcode_scan: ^2.0.2