Android判断网络连接是否可用

ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); //判断网络连接类型,此处为wifi NetworkInfo networkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI); //此处判断网络是否连接(注:此处只能判断网络是否连接,不能判断网络是否可用) if (networkInfo != null) return networkInfo.getState() == Netw