When Wifi disconnect, how does Socket on Android server side know that?

I developed an Android app, which works in Wifi AP mode as a Socket server. Some clients setup Wifi connection and socket connection with my app. When the socket is connected, I disconnect the Wifi connection from the client, however there is no exception nor the read method of socket return -1 in my server app. My questions are:

How to detect the broken wifi connection

How to detect which client's wifi connection is broken

Thanks.

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在线程中使用它

public static boolean checkNetworkConnection(Context context)   
{   

   final ConnectivityManager connMgr = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);   

   final android.net.NetworkInfo wifi =connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);   
   final android.net.NetworkInfo mobile =connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);   

   if(wifi.isAvailable()||mobile.isAvailable())   
       return true;   
   else  
       return false;   
}  

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