Работает функционал переключения валют, остались правки по ui

lib/screens/currencies.dart

@@ -1,8 +1,7 @@
 import 'package:checker/base/settings_base_state.dart';
 import 'package:flutter/material.dart';
-import 'package:checker/consts.dart';
 import 'package:checker/strings.dart';
-import 'package:checker/base/base_state.dart';
+import 'package:checker/common.dart';
 
 class CurrenciesScreen extends StatefulWidget {
   @override State createState() => new _CurrenciesState();
@@ -10,6 +9,8 @@ class CurrenciesScreen extends StatefulWidget {
 
 class _CurrenciesState extends SettingsBaseState<CurrenciesScreen> {
 
+  List<int> currencies = const [643, 840, 980];
+
   @override
   List<String> getOptions() {
 
@@ -20,8 +21,22 @@ class _CurrenciesState extends SettingsBaseState<CurrenciesScreen> {
     return [ruble, dollar, hryvna];
   }
 
+  @override
+  void getSelectedValue() {
+    helper.getCurrency().then((currency) {
+      setState(() {
+        selectedItem = currencies.indexOf(currency);
+      });
+    });
+  }
+
   @override
   String getTitle() {
     return StringsLocalization.settings();
   }
+
+  @override
+  saveOption() async {
+    await helper.saveCurrency(currencies[selectedItem]);
+  }
 }

lib/screens/languages.dart

@@ -2,6 +2,7 @@ import 'package:checker/base/settings_base_state.dart';
 import 'package:flutter/material.dart';
 import 'package:checker/consts.dart';
 import 'package:checker/strings.dart';
+import 'package:checker/common.dart';
 
 class LanguagesScreen extends StatefulWidget {
   @override State createState() => new _LanguagesState();
@@ -18,4 +19,19 @@ class _LanguagesState extends SettingsBaseState<LanguagesScreen> {
   String getTitle() {
     return StringsLocalization.locale();
   }
+
+  @override
+  void saveOption() {
+//    helper.sa(languages[selectedItem]);
+  }
+
+  @override
+  void getSelectedValue() {
+    helper.getLocale().then((locale) {
+      setState(() {
+        print(selectedItem);
+        selectedItem = getOptions().indexOf(getLocaleTitle(locale));
+      });
+    });
+  }
 }

lib/screens/purchase.dart

@@ -203,29 +203,31 @@ class PurchaseScreenState<T> extends BaseState<PurchaseScreen> {
 
           String url = user['purchases_url'];
 
-          var body = {
-            'doc_id': result,
-            'curr_iso_code': '643',
-            'commit': 'true',
-            'sum_total': sumTotal
-          };
+          helper.getCurrency().then((currency) {
+            var body = {
+              'doc_id': result,
+              'curr_iso_code': currency.toString(),
+              'commit': 'true',
+              'sum_total': sumTotal
+            };
 
-          var headers = {
-            'DM-Authorization': 'dmapptoken $appToken',
-            'Authorization': 'dmtoken ${token}'
-          };
+            var headers = {
+              'DM-Authorization': 'dmapptoken $appToken',
+              'Authorization': 'dmtoken ${token}'
+            };
 
-          httpClient.post(url, body: body, headers: headers).then((response) {
+            httpClient.post(url, body: body, headers: headers).then((response) {
 
-            print(response.body);
-            helper.close().then((_) {
-              Navigator.of(context).pop();
-              pushRouteReplacement(context, new PurchaseSuccessScreen(sumTotal, user['first_name'] == null ? '' : user['first_name']));
+              print(response.body);
+              helper.close().then((_) {
+                Navigator.of(context).pop();
+                pushRouteReplacement(context, new PurchaseSuccessScreen(sumTotal, user['first_name'] == null ? '' : user['first_name']));
+              });
+
+            }).catchError((error) {
+              purchaseInProgress = false;
+              print(error.toString());
             });
-
-          }).catchError((error) {
-            purchaseInProgress = false;
-            print(error.toString());
           });
         });
       }