Android判断网络类型的方法(2g,3g还是wifi)

ConnectivityManager connectMgr = (ConnectivityManager) this
    .getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = connectMgr.getActiveNetworkInfo();

info ==null
info.getType() == ConnectivityManager.TYPE_WIFI

info !=null && info.getType() == ConnectivityManager.TYPE_MOBILE

private String getPhoneIp() {
    try {
      for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
        NetworkInterface intf = en.nextElement();
        for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
          InetAddress inetAddress = enumIpAddr.nextElement();
          if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) {
          //if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet6Address) {
            return inetAddress.getHostAddress().toString();
          }
        }
      }
    } catch (Exception e) {
    }
    return "";
}