/**

     * 获取当前的网络状态 ：没有网络-0：WIFI网络1：4G网络-4：3G网络-3：2G网络-2

     * 自定义

     *

     * @param context

     * @return

     */

    public static int getAPNType(Context context) {

        //结果返回值

        int netType = ;

        //获取手机所有连接管理对象

        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        //获取NetworkInfo对象

        NetworkInfo networkInfo = manager.getActiveNetworkInfo();

        //NetworkInfo对象为空 则代表没有网络

        if (networkInfo == null) {

            return netType;

        }

        //否则 NetworkInfo对象不为空 则获取该networkInfo的类型

        int nType = networkInfo.getType();

        if (nType == ConnectivityManager.TYPE_WIFI) {

            //WIFI

            netType = ;

        } else if (nType == ConnectivityManager.TYPE_MOBILE) {

            int nSubType = networkInfo.getSubtype();

            TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);

            //3G   联通的3G为UMTS或HSDPA 电信的3G为EVDO

            if (nSubType == TelephonyManager.NETWORK_TYPE_LTE

                    && !telephonyManager.isNetworkRoaming()) {

                netType = ;

            } else if (nSubType == TelephonyManager.NETWORK_TYPE_UMTS

                    || nSubType == TelephonyManager.NETWORK_TYPE_HSDPA

                    || nSubType == TelephonyManager.NETWORK_TYPE_EVDO_0

                    && !telephonyManager.isNetworkRoaming()) {

                netType = ;

                //2G 移动和联通的2G为GPRS或EGDE，电信的2G为CDMA

            } else if (nSubType == TelephonyManager.NETWORK_TYPE_GPRS

                    || nSubType == TelephonyManager.NETWORK_TYPE_EDGE

                    || nSubType == TelephonyManager.NETWORK_TYPE_CDMA

                    && !telephonyManager.isNetworkRoaming()) {

                netType = ;

            } else {

                netType = ;

            }

        }

        return netType;

    }

/*

 * @category 判断是否有外网连接（普通方法不能判断外网的网络是否连接，比如连接上局域网）

 * @return

 */

public static final boolean ping() { 

  String result = null;

  try {

      String ip = "www.baidu.com";// ping 的地址，可以换成任何一种可靠的外网

      Process p = Runtime.getRuntime().exec("ping -c 3 -w 100 " + ip);// ping网址3次

      // 读取ping的内容，可以不加

      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的状态

      int status = p.waitFor();

      if (status == ) {

          result = "success";

          return true;

      } else {

          result = "failed";

      }

  } catch (IOException e) {

      result = "IOException";

  } catch (InterruptedException e) {

      result = "InterruptedException";

  } finally {

      Log.d("----result---", "result = " + result);

  }

  return false;

}