java 获取ip地址

1.使用WIFI

首先设置用户权限

<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，代码如下

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //获取wifi服务
        WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        //判断wifi是否开启
        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，设置用户上网权限

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

 

其次，代码如下

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;
    }