migrate example apps to null safety

Author: matehat

example/flutter_app/lib/main.dart

@@ -1,5 +1,5 @@
-import 'package:logging/logging.dart';
 import 'package:flutter/material.dart';
+import 'package:logging/logging.dart';
 import 'package:phoenix_socket/phoenix_socket.dart';
 
 void main() {
@@ -41,7 +41,7 @@ class MyApp extends StatelessWidget {
 }
 
 class MyHomePage extends StatefulWidget {
-  MyHomePage({Key key, this.title}) : super(key: key);
+  MyHomePage({Key? key, required this.title}) : super(key: key);
 
   // This widget is the home page of your application. It is stateful, meaning
   // that it has a State object (defined below) that contains fields that affect
@@ -61,8 +61,8 @@ class MyHomePage extends StatefulWidget {
 class _MyHomePageState extends State<MyHomePage> {
   int _counter = 0;
   bool _connected = false;
-  PhoenixSocket _socket;
-  PhoenixChannel _channel;
+  late PhoenixSocket _socket;
+  PhoenixChannel? _channel;
 
   _MyHomePageState() {
     _socket = PhoenixSocket('ws://localhost:4001/socket/websocket')..connect();
@@ -72,7 +72,7 @@ class _MyHomePageState extends State<MyHomePage> {
     _socket.openStream.listen((event) {
       setState(() {
         _channel = _socket.addChannel(topic: 'channel3');
-        return _connected = true;
+        _connected = true;
       });
     });
   }
@@ -100,7 +100,9 @@ class _MyHomePageState extends State<MyHomePage> {
       appBar: AppBar(
         // Here we take the value from the MyHomePage object that was created by
         // the App.build method, and use it to set our appbar title.
-        title: Text(_connected ? "Connected" : "Disconnected"),
+        title: Text(
+          _channel != null && _connected ? "Connected" : "Disconnected",
+        ),
       ),
       body: Center(
         // Center is a layout widget. It takes a single child and positions it

example/flutter_app/pubspec.yaml

@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter:
@@ -29,7 +29,7 @@ dependencies:
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^1.0.0
+  cupertino_icons: ^1.0.2
 
 dev_dependencies:
   flutter_test:

example/flutter_app/test/widget_test.dart

@@ -13,9 +13,10 @@ void main() async {
   channel1.push('ping', {'from': uuid});
 
   await for (var message in channel1.messages) {
-    if (message.event != 'pong' || message.payload['from'] == uuid) continue;
-    print("received ${message.event} from ${message.payload['from']}");
-    Timer(Duration(seconds: 1), () {
+    if (message.event != PhoenixChannelEvent.custom('pong') ||
+        message.payload?['from'] == uuid) continue;
+    print("received ${message.event} from ${message.payload!['from']}");
+    Timer(const Duration(seconds: 1), () {
       channel1.push('ping', {'from': uuid});
     });
   }

example/simple/lib/main.dart

@@ -2,13 +2,15 @@ name: phoenix_socket_example
 description: A PhoenixSocket example
 version: 0.0.2
 homepage: https://www.github.com/matehat/phoenix-socket-dart
+publish_to: none
 
 environment:
-  sdk: ">=2.3.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   phoenix_socket:
     path: ../../
-  uuid: ^2.0.4
+
+  uuid: ^3.0.1
 
 dev_dependencies: {}