Android机器不在网络上 [英] Android Machine is not on the network

问题描述

当我的应用连接到WiFi网络时，我遇到问题运行网络服务。
我收到以下异常，

I am having a problem Running a network service when my app connects to a WiFi network. I am getting a the following exception,

java.net.SocketException：套接字失败：ENONET（机器不在网络上） ）

java.net.SocketException: socket failed: ENONET (Machine is not on the network) in the openPort() method bellow

BroadcastReceiver

@Override
public void onReceive(Context context, Intent intent) {

    String action = intent.getAction();

    if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(action)) {

        NetworkInfo networkInfo = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);

        if (networkInfo.getState() == NetworkInfo.State.CONNECTED) {
            welcomeService = new BroadcastService(context, "Welcome");
            Log.i(TAG, "onReceive: SUPPLICANT-STATE ---> Connected");
            //do something
            if (!serviceRegistered) {
                welcomeService.registerService();
                serviceRegistered = true;
            }
        }

        if (networkInfo.getState() == NetworkInfo.State.DISCONNECTED) {
            Log.i(TAG, "onReceive: SUPPLICANT-STATE ---> Disconnected");
            //do something
            unRegisterService();
        }
    }

}

public void unRegisterService() {
    if (serviceRegistered && welcomeService != null) {
        welcomeService.unregisterService();
        serviceRegistered = false;

    }
}

BroadcastService

public void registerService() {
    NsdServiceInfo serviceInfo  = new NsdServiceInfo();
    serviceInfo.setServiceName(mServiceName);
    serviceInfo.setServiceType("_http._tcp.");
    serviceInfo.setPort(openPort());

    mNsdManager = (NsdManager) mContext.getSystemService(Context.NSD_SERVICE);

    mNsdManager.registerService(serviceInfo, NsdManager.PROTOCOL_DNS_SD, mRegistrationListener);
}

private int openPort() {
    try{
        // Line that throws the exception
        return  new ServerSocket(0).getLocalPort();
    }catch (IOException ioe){
        Crashlytics.logException(ioe);
        ioe.printStackTrace();
        return 0;
    }
}

这个广播接收器仅在主要活动时运行正在显示。它在第一次运行时工作正常但是当我改变WiFi网络时会发生这种情况。非常感谢帮助世界。

This the Broadcast Receiver only runs on when the main activity is showing. and it works fine on the first run but when I change the WiFi network this happens. Help world be greatly appreciated.

推荐答案

使用服务启动服务并在网络发生变化或停止网络时停止服务。检查首先使用release的同一个端口以及之后使用该port。在 onStartCommand（）中执行你想做的任何任务。

Use Service which start service and stop service when network would be change or when stop network.Also check same port which is using release first and after that use that port.Do whatever task you want in onStartCommand().

@Override
public void onReceive(Context context, Intent intent) {
  Date now = new Date();
  Long time = now.getTime();
  String action = intent.getAction();



  NetworkInfo networkInfo = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);

  if (networkInfo.getState() == NetworkInfo.State.CONNECTED) {


    boolean check = isMyServiceRunning(context,
    service.getName());
    if (check) {
      Intent i = new Intent(sqlitewraper.context,service.class);
      stopService(i);
    }
    else{
      Intent i = new Intent(sqlitewraper.context,service.class);
      startservice(i);

    }

  }

  if (networkInfo.getState() == NetworkInfo.State.DISCONNECTED) {

    boolean check = isMyServiceRunning(context,
    service.getName());
    if (check) {
      Intent i = new Intent(sqlitewraper.context,service.class);
      stopService(i);
    }
  }


  private boolean isMyServiceRunning(Context context, String Myservice) {
    ActivityManager manager = (ActivityManager) context
    .getSystemService(Context.ACTIVITY_SERVICE);
    for (RunningServiceInfo service : manager
    .getRunningServices(Integer.MAX_VALUE)) {
      if (Myservice.equals(service.service.getClassName())) {

        return true;
      }
    }
    return false;
  }
}

这篇关于Android机器不在网络上的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！