public boolean haveNetworkConnection()
     {
       ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
       NetworkInfo netInfo = cm.getActiveNetworkInfo();
       if (netInfo == null)
          return false;
      else
          {
          if(netInfo.isConnected())
              return true;
          else
              return false;
          }
    }