Merge pull request #37 from optimist-dev/migrate-example-to-null-safety

Migrate example to null safety

example/lib/examples_page.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:vk_bridge/vk_bridge.dart';
 
+/// Main page of example app
 class ExamplesPage extends StatefulWidget {
   @override
   _ExamplesPageState createState() => _ExamplesPageState();
@@ -180,8 +181,8 @@ class _ExamplesPageState extends State<ExamplesPage> {
                 call: (it) => it.showCommunityWidgetPreviewBox(
                     groupId: _vkMiniAppGroupId, type: 'text', code: '''
                 "return {
-    \"title\": \"Цитата\",
-    \"text\": \"Текст цитаты\"
+    "title": "Цитата",
+    "text": "Текст цитаты"
 };"
 '''),
               ),
@@ -208,9 +209,9 @@ class _ExamplesPageState extends State<ExamplesPage> {
               _button(
                 title: 'setViewSettings',
                 call: (it) => it.setViewSettings(
-                  statusBarStyle: "light",
-                  actionBarColor: "#ff00ff",
-                  navigationBarColor: "#ff0000",
+                  statusBarStyle: 'light',
+                  actionBarColor: '#ff00ff',
+                  navigationBarColor: '#ff0000',
                 ),
               ),
               _button(
@@ -234,7 +235,7 @@ class _ExamplesPageState extends State<ExamplesPage> {
               const Text('Interacting with Taptic Engine'),
               _button(
                 title: 'tapticNotificationOccurred',
-                call: (it) => it.tapticNotificationOccurred("error"),
+                call: (it) => it.tapticNotificationOccurred('error'),
               ),
               _button(
                 title: 'tapticSelectionChanged',
@@ -290,27 +291,27 @@ class _ExamplesPageState extends State<ExamplesPage> {
   }
 
   Widget _button({
-    @required String title,
-    @required Future<Object> Function(VKBridge vkBridge) call,
+    required String title,
+    required Future<dynamic> Function(VKBridge vkBridge) call,
   }) {
     return Padding(
       padding: const EdgeInsets.all(16),
-      child: RaisedButton(
+      child: ElevatedButton(
         child: Text(title),
         onPressed: () => _callVKBridge(call),
       ),
     );
   }
 
-  void _callVKBridge(Future<Object> Function(VKBridge vkBridge) call) {
+  void _callVKBridge(Future<dynamic> Function(VKBridge vkBridge) call) {
     try {
       call(VKBridge.instance).then(_showResult).catchError(_showErrorDialog);
     } catch (e) {
       print('_callVKBridge: $e');
     }
   }
 
-  void _showResult(Object result) {
+  void _showResult(dynamic result) {
     if (result == null) {
       return;
     }

example/pubspec.lock

@@ -7,7 +7,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.5.0"
+    version: "2.8.1"
   boolean_selector:
     dependency: transitive
     description:
@@ -21,14 +21,14 @@ packages:
       name: built_collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.0.0"
+    version: "5.1.0"
   built_value:
     dependency: transitive
     description:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "8.0.2"
+    version: "8.1.2"
   characters:
     dependency: transitive
     description:
@@ -42,7 +42,7 @@ packages:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.1"
   clock:
     dependency: transitive
     description:
@@ -101,7 +101,7 @@ packages:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.7.0"
   path:
     dependency: transitive
     description:
@@ -115,7 +115,7 @@ packages:
       name: rxdart
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.26.0"
+    version: "0.27.1"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -162,7 +162,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.0"
+    version: "0.4.2"
   typed_data:
     dependency: transitive
     description:
@@ -183,6 +183,6 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "1.3.0"
+    version: "2.0.0"
 sdks:
   dart: ">=2.12.0 <3.0.0"

example/pubspec.yaml

@@ -4,7 +4,7 @@ version: 1.0.0+1
 publish_to: none
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter: