Android to determine if there is an extranet connection _android

Android to determine whether the Internet, commonly used is the following methods:

/**
 * Detect whether the network is connected
 * 
 * @return/
Private Boolean isnetworkavailable () {
  //Get network connection Information
  Connectivitymanager manager = (Connectivitymanager) getsystemservice (context.connectivity_service);
  To determine if the network is connected if
  (manager.getactivenetworkinfo ()!= null) {return
    manager.getactivenetworkinfo (). IsAvailable ();
  }
  return false;
}

There are times when we connect to a WiFi or cable that doesn't have an extranet connection, and the current Android SDK doesn't recognize the situation, and the general solution is to ping an extranet.

/* @author Suncat * @category To determine whether there is an extranet connection (the common method can not determine whether the network is connected, such as LAN) * @return/public static final Boolean ping () { 
  String result = null;  try {String IP = "www.baidu.com";//Ping's address, which can be replaced by any reliable extranet Process P = runtime.getruntime (). EXEC ("Ping-c 3 
      -W-M "+ IP"//Ping URL 3 times/Read the contents of Ping, can not add inputstream input = P.getinputstream (); 
      BufferedReader in = new BufferedReader (new InputStreamReader (input)); 
      StringBuffer StringBuffer = new StringBuffer (); 
      String content = ""; 
      while (content = In.readline ())!= null) {stringbuffer.append (content); 
      } log.d ("------ping-----", "Result content:" + stringbuffer.tostring ()); 
      Ping's status int status = P.waitfor (); 
          if (status = = 0) {result = "success"; 
      return true; 
      else {result = "failed"; 
  The catch (IOException e) {result = ' ioexception '; catch (Interruptedexception e) {
      result = "Interruptedexception"; 
  finally {LOG.D ("----Result---", ' result = ' + result);
return false;

 }