如何擷取Android IP地址

 

 

 

1.使用WIFI

首先設定使用者權限

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

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

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

其次，代碼如下

public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

       

        //擷取wifi服務

        WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);

        //判斷wifi是否開啟

        if (!wifiManager.isWifiEnabled()) {

        wifiManager.setWifiEnabled(true);  

        }

        WifiInfo wifiInfo = wifiManager.getConnectionInfo();     

        int ipAddress = wifiInfo.getIpAddress(); 

        String ip = intToIp(ipAddress); 

        EditText et = (EditText)findViewById(R.id.EditText01);

        et.setText(ip);

    }   

    private String intToIp(int i) {     

       

          return (i & 0xFF ) + "." +     

        ((i >> 8 ) & 0xFF) + "." +     

        ((i >> 16 ) & 0xFF) + "." +     

        ( i >> 24 & 0xFF) ;

     } 

2.使用GPRS

首先，設定使用者上網許可權

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

其次，代碼如下

public String getLocalIpAddress()

    {

        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();

                   }

               }

           }

        }

        catch (SocketException ex)

        {

            Log.e("WifiPreference IpAddress", ex.toString());

        }

        return null;

    }