新学 Flutter，请教个问题

[chengxiao]

想写一个功能，对服务器进行每 5 秒 1 次请求，如果达到最大尝试次数，就跳转到屏保页面，现在遇到个问题，就是在我更改了全局变量后，终端依旧会对之前的全局配置进行错误请求。

@override
  void initState() {
    super.initState();
    setState(() {
      if (Global.serverAddress == "") {
        Global.serverAddress = "127.0.0.1";
        Global.serverPort = "80";
      }

      this.host = Global.serverAddress + ":" + Global.serverPort;
      print("++++++++++++++++++++++++++++++++++++++++++++");
      print(this.host);
    });
    timer = Timer.periodic(Duration(seconds: 5), (Timer t) => get());
  }
  
    get() async {
    var full = "http://" + this.host + "/data.json";
    var url = Uri.parse(full);
    var response = await http.get(url);
      Map data = json.decode(response.body);
      setState(() {
        wrongTry++;
        setComputeState(data);
      });
  }
  
  

当我从其他页面把配置改成"192.168.100.156"后，虽然画面渲染是 OK 的，但是后台还是不停的对之前的错误地址 127.0.0.1 进行重试，这是什么原因呢？

I/flutter ( 5764): ++++++++++++++++++++++++++++++++++++++++++++
I/flutter ( 5764): 192.168.100.156:8085
E/flutter ( 5764): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: SocketException: OS Error: Connection refused, errno = 111, address = 127.0.0.1, port = 51088
E/flutter ( 5764): 
E/flutter ( 5764): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: SocketException: OS Error: Connection refused, errno = 111, address = 127.0.0.1, port = 51092
E/flutter ( 5764): 
E/flutter ( 5764): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: SocketException: OS Error: Connection refused, errno = 111, address = 127.0.0.1, port = 51096
E/flutter ( 5764): 
E/flutter ( 5764): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: SocketException: OS Error: Connection refused, errno = 111, address = 127.0.0.1, port = 51100

[serious198706]

之前的 timer 没 cancel 掉。