Flutter高仿微信-第26篇-新的朋友

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。

详情请查看

效果图：

实现代码：

/**
 * Author : wangning
 * Email : maoning20080809@163.com
 * Date : 2022/8/17 15:48
 * Description : 新的朋友
 */
class NewFriends extends StatelessWidget {
  const NewFriends({super.key});

  @override
  Widget build(BuildContext context) {
    return const NewFriendsPage(title: '新的朋友');
  }
}

class NewFriendsPage extends StatefulWidget {
  const NewFriendsPage({super.key, required this.title});
  final String title;
  @override
  State createState() => _NewFriendsPageState();
}

class _NewFriendsPageState extends State {
  final ScrollController _scrollController = ScrollController(); //listview 的控制器
  List _contactList = [];

  var json; //是否正在加载数据
  @override
  void initState() {
    super.initState();
    _updateStatus();
    _getData();
    //下面这个方法每次都底部都会执行，上面的代码只会执行一次
    _scrollController.addListener(() {
      if (_scrollController.position.pixels >
          _scrollController.position.maxScrollExtent - 20) {
        _getData();
      }
    });
  }

  //更改状态
  void _updateStatus() async {
    ContactsRepository.getInstance().updateContactStatusRead();
    Map result = HashMap();
    eventBus.emit(BaseEvent(BaseEvent.TYPE_READ_FRIENDS, result: result));
  }

  //加载数据
  _getData() async {
    List contactList = await ContactsRepository.getInstance().findAllContactsCombNew();
    _contactList = [];
    setState(() {
      _contactList = contactList;
    });
  }

  //没有好友请求显示
  Widget _noDataWidget() {
    return Center(
      child: Padding(
        padding: EdgeInsets.all(10.0),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Text('没有新的朋友...',style: TextStyle(fontSize: 16.0),)
          ],
        ),
      ),
    );
  }

  Future _onRefresh() async {
    await Future.delayed(Duration(seconds: 3), () {
      LogUtils.d('通讯录refresh');
    });
  }

  //接受好友邀请
  void _receiveFriends(ContactsBeanComb contactsBeanComb){
    XmppManager.getInstance().createRoster(contactsBeanComb.toAccount);
    ContactsBean contactsBean = ContactsBean();
    contactsBean.id = contactsBeanComb.id;
    contactsBean.fromAccount = contactsBeanComb.fromAccount;
    contactsBean.toAccount = contactsBeanComb.toAccount;
    contactsBean.type = ContactsBean.typeReceive;
    contactsBean.addTime = contactsBeanComb.addTime;
    ContactsRepository.getInstance().updateContactLocal(contactsBean);
    ContactsRepository.getInstance().updateContactServer(contactsBean);
    ChatSendBean chatSendBean = ChatSendBean();
    chatSendBean.contentType = CommonUtils.TYPE_RECEIVE_FRIENDS;
    chatSendBean.content = contactsBeanComb.toAccount;
    String message = jsonEncode(chatSendBean);
    _sendMessage(contactsBeanComb.fromAccount, message);

    Map result = HashMap();
    eventBus.emit(BaseEvent(BaseEvent.TYPE_RECEIVE_FRIENDS, result: result));
    Navigator.pop(context);
  }

  //发送消息
  _sendMessage(String toAccount, var message){
    int id = DateTime.now().millisecondsSinceEpoch;
    String account = SpUtils.getString(CommonUtils.LOGIN_ACCOUNT);
    String toJid = toAccount + "@wangning";
    XmppManager.getInstance().sendMessage(toJid, message, "$account", id);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: WnAppBar.getAppBar(context, Text("${widget.title}")),

      body: Column(
        children: [
          Expanded(
              child:_contactList.length > 0
                  ? RefreshIndicator(
                  onRefresh: _onRefresh,
                  child: ListView.builder(
                      itemCount: _contactList.length,
                      controller: _scrollController,
                      itemBuilder: (context, index) {
                        return InkWell(
                          onLongPress: (){
                            _showDeleteDialog(_contactList[index].fromAccount, _contactList[index].toAccount);
                          },
                          onTap: (){
                          },
                          child: Container(
                            decoration: BoxDecoration(border: Border(bottom:BorderSide(color: Color(0xffd9d9d9), width: 0.3))),
                            width: double.infinity,
                            padding: EdgeInsets.only(left: 14, top: 10, bottom: 10),
                            child: Row(
                              children: [
                                CommonAvatarView.showBaseImage(_contactList[index].avatar),
                                SizedBox(width: 12,),
                                Text(_contactList[index].nickName, maxLines: 1,style: TextStyle(fontSize: 18, color: Colors.black, fontWeight: FontWeight.bold),),
                                SizedBox(width: 12,),
                                Expanded(child: SizedBox()),//自动扩展挤压
                                _getFriendsStatus(_contactList[index]),
                              ],
                            ),
                          ),
                        );

                      }))
                  : _noDataWidget()
          ),

        ],
      ),
    );
  }

  //删除对话框
  Future _showDeleteDialog(String fromAccount, String toAccount) async {
    return showDialog(
        context: context,
        barrierDismissible: false,
        builder: (BuildContext context) {
          return AlertDialog(
            title: Text('确定要删除该好友吗？', style: new TextStyle(fontSize: 17.0)),
            actions: [
              MaterialButton(
                child: Text('取消'),
                onPressed: (){
                  LogUtils.d("确定取消");
                  Navigator.of(context).pop();
                },
              ),
              MaterialButton(
                child: Text('确定'),
                onPressed: (){
                  LogUtils.d("确定删除");
                  Navigator.pop(context);
                  _deleteContacts(fromAccount, toAccount);
                },
              )
            ],
          );
        }
    );
  }

  //删除联系人
  _deleteContacts(String fromAccount, String toAccount) async{
    bool deleteServerFlag = await ContactsRepository.getInstance().deleteContactsByAccountServer(fromAccount, toAccount);
    if(deleteServerFlag){
      bool deleteFlag = await ContactsRepository.getInstance().deleteContactsByAccount(fromAccount, toAccount);
      if(deleteFlag){
        CommonToast.show(context, "删除成功！");
        _getData();
      } else {
        CommonToast.show(context, "删除失败！");
      }
    } else {
      CommonToast.show(context, "删除失败！");
    }
  }

  Widget _getFriendsStatus(ContactsBeanComb contactsBeanComb){
    String account = SpUtils.getString(CommonUtils.LOGIN_ACCOUNT);
    LogUtils.d("新的朋友 _getFriendsStatus ${account} , ${contactsBeanComb.fromAccount}, ${contactsBeanComb.toAccount}");
    if(contactsBeanComb.fromAccount == account) {
      LogUtils.d("已发送");
      return GestureDetector(
        onLongPress: (){
          _receiveFriends(contactsBeanComb);
        },
        child: Container(
          margin: EdgeInsets.only(left: 12.0, right: 12),
          child: Text("已发送"),
        ),
      );
    } else if(contactsBeanComb.type == ContactsBean.typeRequest||contactsBeanComb.type == ContactsBean.typeRead){
      LogUtils.d("同意按钮");
      return Container(
        margin: EdgeInsets.only(left: 12.0, right: 12),
        child: MaterialButton(
          color: Colors.green,
          textColor: Colors.white,
          child: Text("同意"),
          onPressed: (){
            LogUtils.d("新的朋友点击添加");
            _receiveFriends(contactsBeanComb);
          },
        ),
      );
    }
    return Text("");
  }
}