diff --git a/bytedesk_demo/android/app/build.gradle b/bytedesk_demo/android/app/build.gradle
index 7f00281..5afe2f0 100644
--- a/bytedesk_demo/android/app/build.gradle
+++ b/bytedesk_demo/android/app/build.gradle
@@ -30,7 +30,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.bytedesk.bytedesk_demo"
-        minSdkVersion 16
+        minSdkVersion 19
         targetSdkVersion 30
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
diff --git a/bytedesk_demo/lib/main.dart b/bytedesk_demo/lib/main.dart
index 4b34b7a..0e9efdc 100644
--- a/bytedesk_demo/lib/main.dart
+++ b/bytedesk_demo/lib/main.dart
@@ -10,7 +10,7 @@ import 'package:bytedesk_demo/page/setting_page.dart';
 import 'package:bytedesk_demo/page/user_info_page.dart';
 import 'package:overlay_support/overlay_support.dart';
 import 'package:flutter/material.dart';
-import 'package:vibration/vibration.dart';
+// import 'package:vibration/vibration.dart';
 import 'package:audioplayers/audioplayers.dart';
 
 void main() {
@@ -41,10 +41,11 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
   //
   String _title = '萝卜丝客服Demo(连接中...)';
   AudioCache audioCache = AudioCache();
+  // bool _isConnected = false;
   //
   @override
   void initState() {
-    WidgetsBinding.instance.addObserver(this);
+    WidgetsBinding.instance?.addObserver(this);
     super.initState();
     _listener();
   }
@@ -130,6 +131,16 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
           )
         ],
       ).toList()),
+      // floatingActionButton: FloatingActionButton(
+      //   onPressed: () {
+      //     // 第二步：到 客服管理->技能组-有一列 ‘唯一ID（wId）’, 默认设置工作组wid
+      //     // 说明：一个技能组可以分配多个客服，访客会按照一定的规则分配给组内的各个客服账号
+      //     String _workGroupWid = "201807171659201"; // 默认人工
+      //     BytedeskKefu.startWorkGroupChat(context, _workGroupWid, "技能组客服-默认人工");
+      //   },
+      //   tooltip: '客服',
+      //   child: Icon(Icons.message),
+      // ), // Th
     );
   }
 
@@ -157,7 +168,7 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
       // print('receive message:' + event.message.content);
       // 1. 首先将example/assets/audio文件夹中文件拷贝到自己项目；2.在自己项目pubspec.yaml中添加assets
       // 播放发送消息提示音
-      if (BytedeskKefu.getPlayAudioOnSendMessage() &&
+      if (BytedeskKefu.getPlayAudioOnSendMessage()! &&
           event.message.isSend == 1) {
         print('play send audio');
         // 修改为自己项目中语音文件路径
@@ -168,49 +179,53 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
         return;
       }
       // 接收消息播放提示音
-      if (BytedeskKefu.getPlayAudioOnReceiveMessage() &&
+      if (BytedeskKefu.getPlayAudioOnReceiveMessage()! &&
           event.message.isSend == 0) {
         print('play receive audio');
         audioCache.play('audio/bytedesk_dingdong.wav');
       }
       // 振动
-      if (BytedeskKefu.getVibrateOnReceiveMessage() &&
+      if (BytedeskKefu.getVibrateOnReceiveMessage()! &&
           event.message.isSend == 0) {
         print('should vibrate');
         vibrate();
       }
       if (event.message.type == BytedeskConstants.MESSAGE_TYPE_TEXT) {
-        print('文字消息: ' + event.message.content);
+        print('文字消息: ' + event.message.content!);
         // 判断当前是否客服页面，如否，则显示顶部通知栏
-        if (!BytedeskUtils.isCurrentChatKfPage()) {
+        if (!BytedeskUtils.isCurrentChatKfPage()!) {
           // https://github.com/boyan01/overlay_support
           showOverlayNotification((context) {
             return MessageNotification(
-              avatar: event.message.user.avatar,
-              nickname: event.message.user.nickname,
-              content: event.message.content,
+              avatar: event.message.user!.avatar!,
+              nickname: event.message.user!.nickname!,
+              content: event.message.content!,
               onReply: () {
                 //
-                OverlaySupportEntry.of(context).dismiss();
+                OverlaySupportEntry.of(context)!.dismiss();
                 // 进入客服页面，支持自定义页面标题
-                BytedeskKefu.startChatThread(context, event.message.thread,
+                BytedeskKefu.startChatThread(context, event.message.thread!,
                     title: '客服会话');
               },
             );
           }, duration: Duration(milliseconds: 4000));
         }
       } else if (event.message.type == BytedeskConstants.MESSAGE_TYPE_IMAGE) {
-        print('图片消息:' + event.message.imageUrl);
+        print('图片消息:' + event.message.imageUrl!);
       } else if (event.message.type == BytedeskConstants.MESSAGE_TYPE_VOICE) {
-        print('语音消息:' + event.message.voiceUrl);
+        print('语音消息:' + event.message.voiceUrl!);
       } else if (event.message.type == BytedeskConstants.MESSAGE_TYPE_VIDEO) {
-        print('视频消息:' + event.message.videoUrl);
+        print('视频消息:' + event.message.videoUrl!);
       } else if (event.message.type == BytedeskConstants.MESSAGE_TYPE_FILE) {
-        print('文件消息:' + event.message.fileUrl);
+        print('文件消息:' + event.message.fileUrl!);
       } else {
         print('其他类型消息');
       }
     });
+    // token过期
+    bytedeskEventBus.on<InvalidTokenEventBus>().listen((event) {
+      // 执行重新初始化
+    });
   }
 
   // @override
@@ -232,14 +247,15 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
 
   // 振动
   void vibrate() async {
-    if (await Vibration.hasVibrator()) {
-      Vibration.vibrate();
-    }
+    // if (await Vibration.hasVibrator()) {
+    //   Vibration.vibrate();
+    // }
   }
 
   @override
   void dispose() {
-    WidgetsBinding.instance.removeObserver(this);
+    WidgetsBinding.instance?.removeObserver(this);
     super.dispose();
+    // audioCache?
   }
 }
diff --git a/bytedesk_demo/lib/notification/custom_animation.dart b/bytedesk_demo/lib/notification/custom_animation.dart
index abe84df..b6d1f03 100755
--- a/bytedesk_demo/lib/notification/custom_animation.dart
+++ b/bytedesk_demo/lib/notification/custom_animation.dart
@@ -3,21 +3,21 @@ import 'ios_toast.dart';
 
 /// Example to show how to popup overlay with custom animation.
 class CustomAnimationToast extends StatelessWidget {
-  final double value;
+  final double? value;
 
   static final Tween<Offset> tweenOffset = Tween<Offset>(begin: Offset(0, 40), end: Offset(0, 0));
 
   static final Tween<double> tweenOpacity = Tween<double>(begin: 0, end: 1);
 
-  const CustomAnimationToast({Key key, @required this.value}) : super(key: key);
+  const CustomAnimationToast({Key? key, @required this.value}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
     return Transform.translate(
-      offset: tweenOffset.transform(value),
+      offset: tweenOffset.transform(value!),
       child: Opacity(
         child: IosStyleToast(),
-        opacity: tweenOpacity.transform(value),
+        opacity: tweenOpacity.transform(value!),
       ),
     );
   }
diff --git a/bytedesk_demo/lib/notification/custom_notification.dart b/bytedesk_demo/lib/notification/custom_notification.dart
index 168caf9..8a0dede 100755
--- a/bytedesk_demo/lib/notification/custom_notification.dart
+++ b/bytedesk_demo/lib/notification/custom_notification.dart
@@ -2,13 +2,13 @@ import 'package:flutter/material.dart';
 
 class MessageNotification extends StatelessWidget {
   //
-  final VoidCallback onReply;
-  final String avatar;
-  final String nickname;
-  final String content;
+  final VoidCallback? onReply;
+  final String? avatar;
+  final String? nickname;
+  final String? content;
 
   const MessageNotification({
-    Key key,
+    Key? key,
     @required this.onReply,
     @required this.avatar,
     @required this.nickname,
@@ -23,13 +23,13 @@ class MessageNotification extends StatelessWidget {
         child: ListTile(
           leading: SizedBox.fromSize(
               size: const Size(40, 40),
-              child: ClipOval(child: Image.network(avatar))),
-          title: Text(nickname),
-          subtitle: Text(content),
+              child: ClipOval(child: Image.network(avatar!))),
+          title: Text(nickname!),
+          subtitle: Text(content!),
           trailing: IconButton(
               icon: Icon(Icons.reply),
               onPressed: () {
-                if (onReply != null) onReply();
+                if (onReply != null) onReply!();
               }),
         ),
       ),
diff --git a/bytedesk_demo/lib/notification/ios_toast.dart b/bytedesk_demo/lib/notification/ios_toast.dart
index 00929b3..2cbb76c 100755
--- a/bytedesk_demo/lib/notification/ios_toast.dart
+++ b/bytedesk_demo/lib/notification/ios_toast.dart
@@ -5,7 +5,7 @@ class IosStyleToast extends StatelessWidget {
   Widget build(BuildContext context) {
     return SafeArea(
       child: DefaultTextStyle(
-        style: Theme.of(context).textTheme.bodyText2.copyWith(color: Colors.white),
+        style: Theme.of(context).textTheme.bodyText2!.copyWith(color: Colors.white),
         child: Padding(
           padding: const EdgeInsets.all(16),
           child: Center(
diff --git a/bytedesk_demo/lib/page/chat_type_page.dart b/bytedesk_demo/lib/page/chat_type_page.dart
index 85e8688..0d28bbe 100755
--- a/bytedesk_demo/lib/page/chat_type_page.dart
+++ b/bytedesk_demo/lib/page/chat_type_page.dart
@@ -6,7 +6,7 @@ import 'package:flutter/material.dart';
 
 // 多种客服对话类型列表页面
 class ChatTypePage extends StatefulWidget {
-  ChatTypePage({Key key}) : super(key: key);
+  ChatTypePage({Key? key}) : super(key: key);
 
   @override
   _ChatTypePageState createState() => _ChatTypePageState();
diff --git a/bytedesk_demo/lib/page/history_thread_page.dart b/bytedesk_demo/lib/page/history_thread_page.dart
index 48ed2f1..edfabac 100755
--- a/bytedesk_demo/lib/page/history_thread_page.dart
+++ b/bytedesk_demo/lib/page/history_thread_page.dart
@@ -4,7 +4,7 @@ import 'package:flutter/material.dart';
 
 // 历史会话列表
 class HistoryThreadPage extends StatefulWidget {
-  HistoryThreadPage({Key key}) : super(key: key);
+  HistoryThreadPage({Key? key}) : super(key: key);
 
   @override
   _HistoryThreadPageState createState() => _HistoryThreadPageState();
@@ -34,7 +34,7 @@ class _HistoryThreadPageState extends State<HistoryThreadPage> {
           child: ListView.builder(
             padding: EdgeInsets.all(8.0),
             itemBuilder: (_, int index) => ListTile(
-              leading: Image.network(_historyThreadList[index].avatar),
+              leading: Image.network(_historyThreadList[index].avatar!),
               title: Text('${_historyThreadList[index].nickname}, ${_historyThreadList[index].timestamp}'),
               subtitle: Text('${_historyThreadList[index].content}'),
               onTap: () {
diff --git a/bytedesk_demo/lib/page/online_status_page.dart b/bytedesk_demo/lib/page/online_status_page.dart
index 3bf8af8..59f7c61 100755
--- a/bytedesk_demo/lib/page/online_status_page.dart
+++ b/bytedesk_demo/lib/page/online_status_page.dart
@@ -3,7 +3,7 @@ import 'package:flutter/material.dart';
 
 // 查询技能组和指定客服账号的在线状态
 class OnlineStatusPage extends StatefulWidget {
-  OnlineStatusPage({Key key}) : super(key: key);
+  OnlineStatusPage({Key? key}) : super(key: key);
 
   @override
   _OnlineStatusPageState createState() => _OnlineStatusPageState();
diff --git a/bytedesk_demo/lib/page/setting_page.dart b/bytedesk_demo/lib/page/setting_page.dart
index 6eac97c..d189717 100755
--- a/bytedesk_demo/lib/page/setting_page.dart
+++ b/bytedesk_demo/lib/page/setting_page.dart
@@ -4,7 +4,7 @@ import 'package:list_tile_switch/list_tile_switch.dart';
 
 // 消息声音、振动设置页面
 class SettingPage extends StatefulWidget {
-  SettingPage({Key key}) : super(key: key);
+  SettingPage({Key? key}) : super(key: key);
 
   @override
   _SettingPageState createState() => _SettingPageState();
@@ -17,9 +17,9 @@ class _SettingPageState extends State<SettingPage> {
   //
   @override
   void initState() {
-    _playAudioOnSendMessage = BytedeskKefu.getPlayAudioOnSendMessage();
-    _playAudioOnReceiveMessage = BytedeskKefu.getPlayAudioOnReceiveMessage();
-    _vibrateOnReceiveMessage = BytedeskKefu.getVibrateOnReceiveMessage();
+    _playAudioOnSendMessage = BytedeskKefu.getPlayAudioOnSendMessage()!;
+    _playAudioOnReceiveMessage = BytedeskKefu.getPlayAudioOnReceiveMessage()!;
+    _vibrateOnReceiveMessage = BytedeskKefu.getVibrateOnReceiveMessage()!;
     super.initState();
   }
 
diff --git a/bytedesk_demo/lib/page/user_info_page.dart b/bytedesk_demo/lib/page/user_info_page.dart
index d5fed3c..5af3308 100755
--- a/bytedesk_demo/lib/page/user_info_page.dart
+++ b/bytedesk_demo/lib/page/user_info_page.dart
@@ -6,7 +6,7 @@ import 'package:fluttertoast/fluttertoast.dart';
 // 需要首先调用anonymousLogin之后，再调用此接口
 // 自定义用户信息接口-对接APP用户信息
 class UserInfoPage extends StatefulWidget {
-  UserInfoPage({Key key}) : super(key: key);
+  UserInfoPage({Key? key}) : super(key: key);
 
   @override
   _UserInfoPageState createState() => _UserInfoPageState();
@@ -34,7 +34,7 @@ class _UserInfoPageState extends State<UserInfoPage> {
         tiles: [
           ListTile(
             title: Text('设置昵称(见代码)'),
-            subtitle: Text(_nickname ?? ''),
+            subtitle: Text(_nickname),
             onTap: () {
               //
               _setNickname();
@@ -42,7 +42,7 @@ class _UserInfoPageState extends State<UserInfoPage> {
           ),
           ListTile(
             leading: Image.network(
-              _avatar ?? BytedeskConstants.DEFAULT_AVATA,
+              _avatar,
               height: 30,
               width: 30,
             ),
@@ -61,8 +61,8 @@ class _UserInfoPageState extends State<UserInfoPage> {
     // 查询当前用户信息：昵称、头像
     BytedeskKefu.getProfile().then((user) => {
       setState(() {
-        _nickname = user.nickname;
-        _avatar = user.avatar;
+        _nickname = user.nickname!;
+        _avatar = user.avatar!;
       })
     });
   }
diff --git a/bytedesk_demo/pubspec.yaml b/bytedesk_demo/pubspec.yaml
index 13db50e..130b1c2 100644
--- a/bytedesk_demo/pubspec.yaml
+++ b/bytedesk_demo/pubspec.yaml
@@ -15,10 +15,10 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
 # Read more about iOS versioning at
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
-version: 1.0.0+1
+version: 1.0.0+10
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter:
@@ -28,19 +28,19 @@ dependencies:
   # https://pub.dev/packages/event_bus
   event_bus: ^2.0.0
   # toast https://pub.dev/packages/fluttertoast
-  fluttertoast: ^8.0.7
+  fluttertoast: ^8.0.8
   # 消息设置switch https://pub.dev/packages/list_tile_switch
   list_tile_switch: ^1.0.0
   # 应用内-顶部通知栏 https://pub.dev/packages/overlay_support/
   overlay_support: ^1.2.1
   # 播放提示音 https://pub.dev/packages/audioplayers
-  audioplayers: ^0.19.1
+  audioplayers: ^0.20.1
   # 振动 https://pub.dev/packages/vibration
   # 针对报错fatal error: 'vibration/vibration-Swift.h' file not found #import <vibration/vibration-Swift.h>, ld: library not found for -lvibration
   # 请在ios/Podfile中添加：use_frameworks! 
   vibration: ^1.7.3
   # 在线客服 https://pub.dev/packages/bytedesk_kefu
-  bytedesk_kefu: ^1.0.6
+  bytedesk_kefu: ^1.1.1
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
diff --git a/bytedesk_demo/windows/flutter/generated_plugin_registrant.cc b/bytedesk_demo/windows/flutter/generated_plugin_registrant.cc
index cffaf8f..50989f9 100644
--- a/bytedesk_demo/windows/flutter/generated_plugin_registrant.cc
+++ b/bytedesk_demo/windows/flutter/generated_plugin_registrant.cc
@@ -2,6 +2,8 @@
 //  Generated file. Do not edit.
 //
 
+// clang-format off
+
 #include "generated_plugin_registrant.h"
 
 #include <bytedesk_kefu/bytedesk_kefu_plugin.h>
diff --git a/bytedesk_demo/windows/flutter/generated_plugin_registrant.h b/bytedesk_demo/windows/flutter/generated_plugin_registrant.h
index 9846246..dc139d8 100644
--- a/bytedesk_demo/windows/flutter/generated_plugin_registrant.h
+++ b/bytedesk_demo/windows/flutter/generated_plugin_registrant.h
@@ -2,6 +2,8 @@
 //  Generated file. Do not edit.
 //
 
+// clang-format off
+
 #ifndef GENERATED_PLUGIN_REGISTRANT_
 #define GENERATED_PLUGIN_REGISTRANT_