//    @NonNull
    public static String getIPAddress() {
        if (TextUtils.isEmpty(deviceIpAddress))
            new PublicIPAddress().execute();
        return deviceIpAddress;
    }

    public static String deviceIpAddress = "";

    public static class PublicIPAddress extends AsyncTask<String, Void, String> {
        InetAddress localhost = null;

        protected String doInBackground(String... urls) {
            try {
                localhost = InetAddress.getLocalHost();
                URL url_name = new URL("http://bot.whatismyipaddress.com");
                BufferedReader sc = new BufferedReader(new InputStreamReader(url_name.openStream()));
                deviceIpAddress = sc.readLine().trim();
            } catch (Exception e) {
                deviceIpAddress = "";
            }
            return deviceIpAddress;
        }

        protected void onPostExecute(String string) {
            Lg.d("deviceIpAddress", string);
        }
    }

 //    @NonNull
    public static String getIPAddress() {
        if (TextUtils.isEmpty(deviceIpAddress))
            new PublicIPAddress().execute();
        return deviceIpAddress;
    }

    public static String deviceIpAddress = "";

    public static class PublicIPAddress extends AsyncTask<String, Void, String> {
        InetAddress localhost = null;

        protected String doInBackground(String... urls) {
            try {
                localhost = InetAddress.getLocalHost();
                URL url_name = new URL("http://bot.whatismyipaddress.com");
                BufferedReader sc = new BufferedReader(new InputStreamReader(url_name.openStream()));
                deviceIpAddress = sc.readLine().trim();
            } catch (Exception e) {
                deviceIpAddress = "";
            }
            return deviceIpAddress;
        }

        protected void onPostExecute(String string) {
            Lg.d("deviceIpAddress", string);
        }
    }

private InetAddress getLocalAddress()throws IOException {

            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()) {
                            //return inetAddress.getHostAddress().toString();
                            return inetAddress;
                        }
                    }
                }
            } catch (SocketException ex) {
                Log.e("SALMAN", ex.toString());
            }
            return null;
        }

在AndroidManifest.xml中声明ACCESS_WIFI_STATE权限:

<uses-permission
    android:name="android.permission.ACCESS_WIFI_STATE"/>

可以通过WifiManager获取IP地址:

Context context = requireContext().getApplicationContext();
WifiManager wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
String ip = Formatter.formatIpAddress(wm.getConnectionInfo().getIpAddress());

WifiManager wm = (WifiManager) getSystemService(WIFI_SERVICE);
String ipAddress = BigInteger.valueOf(wm.getDhcpInfo().netmask).toString();

这是互联网上最简单的方法…… 首先，将此权限添加到您的manifest文件中…

“互联网” “ACCESS_NETWORK_STATE”

将此添加到Activity的onCreate文件中。

getPublicIP（）;

现在将这个函数添加到MainActivity.class中。

private void getPublicIP() { ArrayList<String> urls=new ArrayList<String>(); //to read each line new Thread(new Runnable(){ public void run(){ //TextView t; //to show the result, please declare and find it inside onCreate() try { // Create a URL for the desired page URL url = new URL("https://api.ipify.org/"); //My text file location //First open the connection HttpURLConnection conn=(HttpURLConnection) url.openConnection(); conn.setConnectTimeout(60000); // timing out in a minute BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream())); //t=(TextView)findViewById(R.id.TextView1); // ideally do this in onCreate() String str; while ((str = in.readLine()) != null) { urls.add(str); } in.close(); } catch (Exception e) { Log.d("MyTag",e.toString()); } //since we are in background thread, to post results we have to go back to ui thread. do the following for that PermissionsActivity.this.runOnUiThread(new Runnable(){ public void run(){ try { Toast.makeText(PermissionsActivity.this, "Public IP:"+urls.get(0), Toast.LENGTH_SHORT).show(); } catch (Exception e){ Toast.makeText(PermissionsActivity.this, "TurnOn wiffi to get public ip", Toast.LENGTH_SHORT).show(); } } }); } }).start(); }