獲取手機外網IP

/**
 * 獲取公網ip(要訪問Url，要放到後臺執行緒裡處理)
 *
 * @return
 */
public static String getNetIp() {
    URL infoUrl = null;
    InputStream inStream = null;
    String line = "";
    try {
        infoUrl = new URL("");
        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();
            // 從反饋的結果中提取出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();
                }

            }


        }
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    Log.i("test", line);
    return line;

}

使用時要開闢執行緒，不然會奔潰

原文連結：http://www.apkbus.com/blog-867211-68759.html