Flutter使用internet_speed包遇MissingPluginException及Socket关闭错误求解决

遇到的错误 #

启动测速时触发两类核心错误：

1. MissingPluginException(No implementation found for method startListening on channel internet_speed)
2. 日志反复输出CONNECTION_ERROR、Socket is closed

错误日志：

I/System.out(12436): port:80
I/flutter (12436): the errorMessage CONNECTION_ERROR, the 
speedTestError Socket is closed
I/flutter (12436): the errorMessage CONNECTION_ERROR, the speedTestError Socket is closed
W/1.raster(12436): type=1400 audit(0.0:100191): avc: denied { search } for name="battery" dev="sysfs" ino=6688 scontext=u:r:untrusted_app:s0:c170,c257,c512,c768 tcontext=u:object_r:sysfs_batteryinfo:s0 tclass=dir permissive=0
I/flutter (12436): the errorMessage CONNECTION_ERROR, the 
speedTestError Socket is closed

最小复现代码 #

class SpeedTestPage extends StatefulWidget {
  const SpeedTestPage({Key? key}) : super(key: key);

  @override
  State createState() => _SpeedTestPageState();
}
    
class _SpeedTestPageState extends State {
  InternetSpeed internetSpeed = InternetSpeed();
 
  @override
  Widget build(BuildContext context) {
    return InkWell(
      child: Text("Click to start"),
      onTap: () {
        internetSpeed.startDownloadTesting(
          onDone: (double transferRate, SpeedUnit unit) {
            debugPrint('the transfer rate $transferRate, the percent 100');
          },
          onProgress: (double percent, double transferRate, SpeedUnit unit) {
            debugPrint('the transfer rate $transferRate, the percent $percent');
          },
          onError: (String errorMessage, String speedTestError) {
            debugPrint('the errorMessage $errorMessage, the speedTestError $speedTestError');
          },
        );
      },
    );
  }
}

解决办法 #

针对MissingPluginException #

• 执行命令清理缓存并重新获取依赖：

  flutter clean
  flutter pub get
  

• 重启IDE，彻底终止当前App进程后重新运行
• 检查AndroidManifest.xml，确保添加必要网络权限：

  <uses-permission android:name="android.permission.INTERNET"/>
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
  

• 确认插件版本，尝试升级到最新稳定版，或回退到已知可用的旧版本

针对CONNECTION_ERROR与Socket is closed #

• 手动指定稳定的测速服务器，替换默认服务器：

  internetSpeed.startDownloadTesting(
    testServer: "http://cdn.example.com", // 替换为稳定的大文件服务器地址
    // 其他回调参数...
  );
  

• 检查设备网络状态，确保网络连接稳定，排除弱网、VPN或代理干扰
• 添加点击防抖，避免频繁触发测速导致连接冲突：

  bool _isTesting = false;
  
  // ...
  
  onTap: () {
    if (_isTesting) return;
    setState(() => _isTesting = true);
    internetSpeed.startDownloadTesting(
      // 回调参数...
      onDone: (rate, unit) {
        setState(() => _isTesting = false);
        // 其他逻辑
      },
      onError: (msg, err) {
        setState(() => _isTesting = false);
        // 错误处理
      },
    );
  },
  

• 排除设备防火墙或安全软件对App网络请求的拦截

代码修正提示 #

原代码存在几个语法问题，建议修正：

• State需指定泛型：State<_SpeedTestPageState>
• @OverRide应为小写的@override
• build方法需返回完整Widget，比如用Scaffold包裹：

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: InkWell(
          // 原代码内容...
        ),
      ),
    );
  }
  

内容的提问来源于stack exchange，提问作者Moses