Flutter高仿微信系列共59篇，从Flutter客户端、Kotlin客户端、Web服务器、数据库表结构、Xmpp即时通讯服务器、视频通话服务器、腾讯云服务器全面讲解。

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效果图：

实现代码：

/*** Author : wangning* Email : maoning20080809@163.com* Date : 2022/8/11 12:16* Description : 添加好友*/
Color themeDef = Color(0xffEDEDED);class AddFriends extends StatelessWidget {UserBean userBean;AddFriends({required this.userBean});@overrideWidget build(BuildContext context) {return AddFriendsPage(title: '添加好友', userBean: userBean,);}
}class AddFriendsPage extends StatefulWidget {UserBean userBean;AddFriendsPage({super.key, required this.title, required this.userBean});final String title;@overrideState createState() => _AddFriendsState();
}class _AddFriendsState extends State {@overridevoid initState() {super.initState();_checkAvailable();}//检查状态， 如果不可以，先登录void _checkAvailable() async{var isAvailable = await XmppManager.getInstance().isAvailable();if(!isAvailable){String account = SpUtils.getString(CommonUtils.LOGIN_ACCOUNT);String password = SpUtils.getString(CommonUtils.LOGIN_PASSWORD);XmppManager.getInstance().connect(account, password);}}bool bCanPress = true;//添加好友void _createRoster(String toAccount) async {if(!bCanPress){return;}bCanPress = false;bool isNetwork = await CommonNetwork.isNetwork();if(!isNetwork) {CommonUtils.showNetworkError(context);return;}var isAvailable = await XmppManager.getInstance().isAvailable();LogUtils.d("连接状态：${isAvailable} , ${toAccount}");if(!isAvailable){_checkAvailable();CommonToast.show(context, "添加失败，请重试！");return;}CommonToast.show(context, "请稍后。。。");UserBean toUserBean = await UserRepository.getInstance().getUserServer(toAccount);if(toUserBean != null){UserRepository.getInstance().insertUserLocal(toUserBean);String account = SpUtils.getString(CommonUtils.LOGIN_ACCOUNT);String addTime = WnDateUtils.getCurrentTime();//添加好友之前， 先删除await ContactsRepository.getInstance().deleteContactsByAccount(account, toAccount);ContactsBean contactsBean  = ContactsBean();contactsBean.fromAccount = account;contactsBean.toAccount = toAccount;contactsBean.type = ContactsBean.typeRequest;contactsBean.addTime = addTime;ContactsRepository.getInstance().insertContactsLocal(contactsBean);ContactsRepository.getInstance().insertContactsServer(contactsBean);XmppManager.getInstance().createRoster(toAccount);//获取对方账号信息//String message = "${CommonUtils.CHAT_CONTENT_TYPE_ADD_FRIENDS}${CommonUtils.CHAT_MESSAGE_SPILE}${account}${CommonUtils.CHAT_MESSAGE_SPILE}${addTime}";ChatSendBean chatSendBean = ChatSendBean();chatSendBean.contentType = CommonUtils.TYPE_ADD_FRIENDS;chatSendBean.content = account;chatSendBean.addTime = addTime;String message = jsonEncode(chatSendBean);_sendMessage(toAccount, message);CommonToast.show(context, "添加成功！");Navigator.pop(context);} else {CommonToast.show(context, "添加失败，请重试！");}//2秒后才可以继续点击Future.delayed(Duration(seconds: 2), (){bCanPress = true;});}_sendMessage(String toAccount, var message){int id = DateTime.now().millisecondsSinceEpoch;String account = SpUtils.getString(CommonUtils.LOGIN_ACCOUNT);String toJid = toAccount + "@wangning";LogUtils.d("添加好友发送消息：${toJid} , ${message}");XmppManager.getInstance().sendMessage(toJid, message, "$account", id);}String results = "";//原来的内容是空的final TextEditingController controller = TextEditingController(text: "");@overrideWidget build(BuildContext context) {return Scaffold(appBar: WnAppBar.getAppBar(context, Text("${widget.title}")),body: Column(children: [_getAccountWidget(),_getAddFriendsWidget(),],),);}//显示用户信息控件Widget _getAccountWidget(){String avatarUrl = widget.userBean.avatar??"";return Container(height: 140,alignment: Alignment.bottomCenter,padding: const EdgeInsets.all(10.0),//上下左右都设置边距child: Row(crossAxisAlignment: CrossAxisAlignment.center,children: [GestureDetector(onTap: (){Navigator.push(context, MaterialPageRoute(builder: (context) => CommonImagePreview(fileName : CommonUtils.getReallyImage(avatarUrl), isNetwork: true, defaultUrl: CommonUtils.getDefaultAvatar(),)));},child: CommonAvatarView.showBaseImage(avatarUrl, 80, 80),),SizedBox(width: 12),Column(crossAxisAlignment: CrossAxisAlignment.start,mainAxisAlignment: MainAxisAlignment.center,children: [Text("${widget.userBean.nickName}", style: TextStyle(fontSize: 20, color: Colors.black),),Text("账号：${widget.userBean.account}", style: TextStyle(fontSize: 16, color: Colors.black),),],),],),);}//添加控件Widget _getAddFriendsWidget(){return Container(padding: const EdgeInsets.all(10.0),//上下左右都设置边距child: Row(mainAxisAlignment: MainAxisAlignment.center,children: [MaterialButton(color: Colors.blue,textColor: Colors.white,padding: EdgeInsets.only(left: 28, top: 8, right: 28, bottom: 8),child: Text('添加到通讯录',style: TextStyle(fontSize: 16),),onPressed: () {LogUtils.d("点击  添加到通讯录 ");_createRoster(widget.userBean.account!);},)],),);}
}