added background for qr image for bright theme.

lib/src/screens/dashboard/widgets/address_page.dart

@@ -3,6 +3,7 @@ import 'package:cake_wallet/src/widgets/alert_with_two_actions.dart';
 import 'package:cake_wallet/src/widgets/keyboard_done_button.dart';
 import 'package:cake_wallet/src/widgets/primary_button.dart';
 import 'package:cake_wallet/store/settings_store.dart';
+import 'package:cake_wallet/themes/theme_base.dart';
 import 'package:cake_wallet/utils/show_pop_up.dart';
 import 'package:cake_wallet/view_model/dashboard/dashboard_view_model.dart';
 import 'package:flutter/material.dart';
@@ -73,7 +74,8 @@ class AddressPage extends StatelessWidget {
                   child: Observer(builder: (_) => QRWidget(
                       addressListViewModel: addressListViewModel,
                       amountTextFieldFocusNode: _cryptoAmountFocus,
-                      isAmountFieldShow: !addressListViewModel.hasAccounts))
+                      isAmountFieldShow: !addressListViewModel.hasAccounts,
+                      isBright: walletViewModel.settingsStore.currentTheme.type == ThemeType.bright))
               ),
               Observer(builder: (_) {
                 return addressListViewModel.hasAddressList

lib/src/screens/receive/receive_page.dart

@@ -125,7 +125,8 @@ class ReceivePage extends BasePage {
                 child: QRWidget(
                     addressListViewModel: addressListViewModel,
                     isAmountFieldShow: true,
-                    amountTextFieldFocusNode: _cryptoAmountFocus),
+                    amountTextFieldFocusNode: _cryptoAmountFocus,
+                    isBright: currentTheme.type == ThemeType.bright),
               ),
               Observer(
                   builder: (_) => ListView.separated(

lib/src/screens/receive/widgets/qr_widget.dart

@@ -13,7 +13,8 @@ class QRWidget extends StatelessWidget {
   QRWidget(
       {@required this.addressListViewModel,
       this.isAmountFieldShow = false,
-      this.amountTextFieldFocusNode})
+      this.amountTextFieldFocusNode,
+      this.isBright})
       : amountController = TextEditingController(),
         _formKey = GlobalKey<FormState>() {
     amountController.addListener(() => addressListViewModel.amount =
@@ -25,6 +26,7 @@ class QRWidget extends StatelessWidget {
   final TextEditingController amountController;
   final FocusNode amountTextFieldFocusNode;
   final GlobalKey<FormState> _formKey;
+  final bool isBright;
 
   @override
   Widget build(BuildContext context) {
@@ -55,7 +57,7 @@ class QRWidget extends StatelessWidget {
                             ),
                             child: QrImage(
                               data: addressListViewModel.uri.toString(),
-                              backgroundColor: Colors.transparent,
+                              backgroundColor: isBright ? Colors.black : Colors.white,
                               foregroundColor: Theme.of(context).accentTextTheme.
                               display3.backgroundColor,
                             ),