判断Wifi 连接

private boolean checkConnection(){   boolean connected = false; ConnectivityManager cm =  (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);  if (cm != null) { NetworkInfo[] netInfo = cm.getAllNetworkInfo();  for (NetworkInfo ni : netInfo) { if ((ni.getTypeName().equalsIgnoreCase("WIFI") || ni.getTypeName().equalsIgnoreCase("MOBILE")) & ni.isConnected() & ni.isAvailable()) { connected = true;      }     }  }   return connected;