Android获取本机IP地址，绝对可行

获取内网IP地址

    /**
     * 获取ip地址
     * @return
     */
    public static String getHostIP() {

        String hostIp = null;
        try {
            Enumeration nis = NetworkInterface.getNetworkInterfaces();
            InetAddress ia = null;
            while (nis.hasMoreElements()) {
                NetworkInterface ni = (NetworkInterface) nis.nextElement();
                Enumeration ias = ni.getInetAddresses();
                while (ias.hasMoreElements()) {
                    ia = ias.nextElement();
                    if (ia instanceof Inet6Address) {
                        continue;// skip ipv6
                    }
                    String ip = ia.getHostAddress();
                    if (!"127.0.0.1".equals(ip)) {
                        hostIp = ia.getHostAddress();
                        break;
                    }
                }
            }
        } catch (SocketException e) {
            Log.i("yao", "SocketException");
            e.printStackTrace();
        }
        return hostIp;

    }

获取外网IP地址

/**
	 * 获取IP地址
	 * @return
     */
	public static String GetNetIp() {
		URL infoUrl = null;
		InputStream inStream = null;
		String line = "";
		try {
			infoUrl = new URL("http://pv.sohu.com/cityjson?ie=utf-8");
			URLConnection connection = infoUrl.openConnection();
			HttpURLConnection httpConnection = (HttpURLConnection) connection;
			int responseCode = httpConnection.getResponseCode();
			if (responseCode == HttpURLConnection.HTTP_OK) {
				inStream = httpConnection.getInputStream();
				BufferedReader reader = new BufferedReader(new InputStreamReader(inStream, "utf-8"));
				StringBuilder strber = new StringBuilder();
				while ((line = reader.readLine()) != null)
					strber.append(line + "\n");
				inStream.close();
				// 从反馈的结果中提取出IP地址
				int start = strber.indexOf("{");
				int end = strber.indexOf("}");
				String json = strber.substring(start, end + 1);
				if (json != null) {
					try {
						JSONObject jsonObject = new JSONObject(json);
						line = jsonObject.optString("cip");
					} catch (JSONException e) {
						e.printStackTrace();
					}
				}
				return line;
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return line;
	}