今天有个朋友要获取Android手机当前连入网络的ip，问我怎么做，我一想这还不简单。告诉他先判断是什么网络环境，如果是WiFi可以通过WifiManager获取到，如果是流量（2G、3G或者4G网）就通过NetworkInterface遍历获取getHostAddress()获得，但是他们要求获取不是路由器发出的局域网ip，而是当前的外网ip，一般我们手机连接路由器，路由器分给我们的ip都是路由器转发的C网段的局域网ip，也就是192.168.x.xx 这样的网段，但是我们想要的真实的外网ip怎么获取呢？
话不多说直接上代码。
public class MainActivity extends Activity { private TextView tv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv = (TextView) findViewById(R.id.tv); new Thread(new Runnable() { @Override public void run() { 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(); } } tv.setText("ip===="+line); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } tv.setText("ip===="+line); } }).start(); } }
这就是方法了，大家可再根据自己的实际需要，进行修改。
