flutter and android version upgraded

android/app/build.gradle

@@ -25,7 +25,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 33
     ndkVersion "21.4.7075529"
 
     lintOptions {
@@ -36,7 +36,7 @@ android {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.cloudwebrtc.flutterwebrtcdemo"
         minSdkVersion 21 
-        targetSdkVersion 28
+        targetSdkVersion 33
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
@@ -52,8 +52,6 @@ android {
             // TODO: Add your own signing config for the release build.
             // Signing with the debug keys for now, so `flutter run --release` works.
             signingConfig signingConfigs.debug
-            useProguard true
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
     packagingOptions {

android/app/src/main/AndroidManifest.xml

@@ -29,6 +29,7 @@
             android:value="2" />
         <activity
             android:name="io.flutter.embedding.android.FlutterActivity"
+            android:exported="true"
             android:launchMode="singleTop"
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"

android/build.gradle

@@ -1,11 +1,13 @@
 buildscript {
+    ext.kotlin_version = '1.9.10'
     repositories {
         google()
         jcenter()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.0'
+        classpath 'com.android.tools.build:gradle:7.3.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
 
@@ -24,6 +26,6 @@ subprojects {
     project.evaluationDependsOn(':app')
 }
 
-task clean(type: Delete) {
+tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }

android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip

lib/src/call_sample/call_sample.dart

@@ -1,8 +1,10 @@
-import 'package:flutter/material.dart';
 import 'dart:core';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_webrtc/flutter_webrtc.dart';
+
 import '../widgets/screen_select_dialog.dart';
 import 'signaling.dart';
-import 'package:flutter_webrtc/flutter_webrtc.dart';
 
 class CallSample extends StatefulWidget {
   static String tag = 'call_sample';
@@ -103,7 +105,6 @@ class _CallSampleState extends State<CallSample> {
           });
 
           break;
-        case CallState.CallStateRinging:
       }
     };
 
@@ -354,7 +355,7 @@ class _CallSampleState extends State<CallSample> {
           : ListView.builder(
               shrinkWrap: true,
               padding: const EdgeInsets.all(0.0),
-              itemCount: (_peers != null ? _peers.length : 0),
+              itemCount: _peers.length,
               itemBuilder: (context, i) {
                 return _buildRow(context, _peers[i]);
               }),

lib/src/call_sample/data_channel_sample.dart

@@ -1,10 +1,12 @@
-import 'package:flutter/material.dart';
-import 'dart:core';
 import 'dart:async';
+import 'dart:core';
 import 'dart:typed_data';
-import 'signaling.dart';
+
+import 'package:flutter/material.dart';
 import 'package:flutter_webrtc/flutter_webrtc.dart';
 
+import 'signaling.dart';
+
 class DataChannelSample extends StatefulWidget {
   static String tag = 'call_sample';
   final String host;
@@ -249,10 +251,11 @@ class _DataChannelSampleState extends State<DataChannelSample> {
           : ListView.builder(
               shrinkWrap: true,
               padding: const EdgeInsets.all(0.0),
-              itemCount: (_peers != null ? _peers.length : 0),
+              itemCount: _peers.length,
               itemBuilder: (context, i) {
                 return _buildRow(context, _peers[i]);
-              }),
+              },
+            ),
     );
   }
 }

lib/src/call_sample/random_string.dart

@@ -40,7 +40,7 @@ int randomBetween(int from, int to) {
 /// Generates a random string of [length] with characters
 /// between ascii [from] to [to].
 /// Defaults to characters of ascii '!' to '~'.
-String randomString(int length, {int from: ASCII_START, int to: ASCII_END}) {
+String randomString(int length, {int from = ASCII_START, int to = ASCII_END}) {
   return String.fromCharCodes(
       List.generate(length, (index) => randomBetween(from, to)));
 }

lib/src/call_sample/signaling.dart

@@ -1,16 +1,16 @@
-import 'dart:convert';
 import 'dart:async';
+import 'dart:convert';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_webrtc/flutter_webrtc.dart';
 
-import '../utils/screen_select_dialog.dart';
-import 'random_string.dart';
-
 import '../utils/device_info.dart'
     if (dart.library.js) '../utils/device_info_web.dart';
+import '../utils/screen_select_dialog.dart';
+import '../utils/turn.dart' if (dart.library.js) '../utils/turn_web.dart';
 import '../utils/websocket.dart'
     if (dart.library.js) '../utils/websocket_web.dart';
-import '../utils/turn.dart' if (dart.library.js) '../utils/turn_web.dart';
+import 'random_string.dart';
 
 enum SignalingState {
   ConnectionOpen,
@@ -459,25 +459,22 @@ class Signaling {
       */
     }
     pc.onIceCandidate = (candidate) async {
-      if (candidate == null) {
-        print('onIceCandidate: complete!');
-        return;
-      }
-      // This delay is needed to allow enough time to try an ICE candidate
-      // before skipping to the next one. 1 second is just an heuristic value
-      // and should be thoroughly tested in your own environment.
       await Future.delayed(
-          const Duration(seconds: 1),
-          () => _send('candidate', {
-                'to': peerId,
-                'from': _selfId,
-                'candidate': {
-                  'sdpMLineIndex': candidate.sdpMLineIndex,
-                  'sdpMid': candidate.sdpMid,
-                  'candidate': candidate.candidate,
-                },
-                'session_id': sessionId,
-              }));
+        const Duration(seconds: 1),
+        () => _send(
+          'candidate',
+          {
+            'to': peerId,
+            'from': _selfId,
+            'candidate': {
+              'sdpMLineIndex': candidate.sdpMLineIndex,
+              'sdpMid': candidate.sdpMid,
+              'candidate': candidate.candidate,
+            },
+            'session_id': sessionId,
+          },
+        ),
+      );
     };
 
     pc.onIceConnectionState = (state) {};
@@ -507,7 +504,7 @@ class Signaling {
   }
 
   Future<void> _createDataChannel(Session session,
-      {label: 'fileTransfer'}) async {
+      {label = 'fileTransfer'}) async {
     RTCDataChannelInit dataChannelDict = RTCDataChannelInit()
       ..maxRetransmits = 30;
     RTCDataChannel channel =

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -5,6 +5,12 @@
 import FlutterMacOS
 import Foundation
 
+import flutter_webrtc
+import path_provider_foundation
+import shared_preferences_foundation
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
+  FlutterWebRTCPlugin.register(with: registry.registrar(forPlugin: "FlutterWebRTCPlugin"))
+  PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
+  SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))
 }