android程序获取WIFI的IP地址和MAC地址

转自：http://my.oschina.net/chenj/blog/68680

近日在鼓捣这玩意，拿出来大家分享一下，代码比较简单，如果有不懂的再问

 <Button
       android:id="@+id/btn"
       android:text="获取IP"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:onClick="onclick"
   />
   <EditText
       android:id="@+id/ip_txt"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"/>

<EditText
       android:id="@+id/mac_txt"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"/>

//这里是权限，添加为AndroidManifest.xml的<manifest>的子节点

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

//接下来就是正文（注意IPV4与IPV6的区别，见注释）

package com.wifi;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
    public static String IP;             //本机IP
    public static String MAC;            //本机MAC

    Button btn=null;
    EditText ip_txt=null;
    EditText mac_txt=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn=(Button)findViewById(R.id.btn);
        ip_txt=(EditText)findViewById(R.id.ip_txt);
        mac_txt=(EditText)findViewById(R.id.mac_txt);

    }
    public void onclick(View v){
        switch (v.getId()) {
        case R.id.btn:
            IP = getLocalIpAddress();  //获取本机IP
            MAC = getLocalMacAddress();//获取本机MAC
            ip_txt.setText(IP);
            mac_txt.setText(MAC);
            break;
        }
    }

    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()&&(inetAddress instanceof Inet4Address)) { // 这是只获取IPV4的，如果要获取IPV6的，改成instanceof Inet6Address
                        return inetAddress.getHostAddress().toString();
                    }
                }
            }
        } catch (SocketException ex) {
            Log.e("WifiPreference IpAddress", ex.toString());
        }
        return null;
    }

    public String getLocalMacAddress() {
        WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        WifiInfo info = wifi.getConnectionInfo();
        return info.getMacAddress();
    }
}

另一种方法：

WifiManager wifi_service = (WifiManager)getSystemService(WIFI_SERVICE);

//检查wifi是否开启  

if(!wifimanage.isWifiEnabled())  {  

　　wifimanage.setWifiEnabled(true);  

}  

WifiInfo wifiinfo= wifimanage.getConnectionInfo();  

String ip=intToIp(wifiinfo.getIpAddress());  

//将获取的int转为真正的ip地址,参考的网上的，修改了下  

private String intToIp(int i)  {
　　return (i & 0xFF)+ "." + ((i >> 8 ) & 0xFF)? + "." + ((i >> 16 ) & 0xFF) +"."+((i >> 24 ) & 0xFF );
} 

关于WifiManager的用法：http://blog.csdn.net/zd_1471278687/article/details/12158367