1. 经常用法，调用Android的API：WifiManager

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

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

WifiInfo info = wifi.getConnectionInfo();

return info.getMacAddress();

此方法须要保证WIFI在本次开机以来以前是打开过的，否则会返回null。所以须要后台尝试先打开WIFI再获取。

演示样例代码：

//尝试打开wifi

private static boolean tryOpenMAC(WifiManager manager)

{

    boolean softOpenWifi = false;

    int state = manager.getWifiState();

    if (state != WifiManager.WIFI_STATE_ENABLED && state != WifiManager.WIFI_STATE_ENABLING)


    {

        manager.setWifiEnabled(true);

        softOpenWifi = true;

    }

    return softOpenWifi;

}

//尝试关闭MAC

private static void tryCloseMAC(WifiManager manager)

{

    manager.setWifiEnabled(false);

}

//尝试获取MAC地址

private static String tryGetMAC(WifiManager manager)

{

    WifiInfo wifiInfo = manager.getConnectionInfo();

    if (wifiInfo == null || StringUtil.isNull(wifiInfo.getMacAddress()))

    {

        return null;

    }

    String mac = wifiInfo.getMacAddress().replaceAll(":", "").trim().toUpperCase();

    mac = formatIdentify(mac);

    return mac;

}

//尝试读取MAC地址

private static String getMacFromDevice(int internal)

{

    String mac=null;

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


    mac = tryGetMAC(wifiManager);

    if(!StringUtil.isNull(mac))

    {

        return mac;

    }

 

    //获取失败，尝试打开wifi获取

    boolean isOkWifi = tryOpenMAC(wifiManager);

    for(int index=0;index<internal;index++)

    {

        //假设第一次没有成功，第二次做100毫秒的延迟。

        if(index!=0)

        {

            try

            {

                Thread.sleep(100);

            }

            catch (InterruptedException e)

            {

                e.printStackTrace();

            }

        }

        mac = tryGetMAC(wifiManager);

        if(!StringUtil.isNull(mac))

        {

            break;

        }

    }

//尝试关闭wifi

    if(isOkWifi)

    {

        tryCloseMAC(wifiManager);

    }

    return mac;

}

==================================================================

2. 查询文件路径 /sys/class/net/wlan0/address

adb shell cat /sys/class/net/wlan0/address

98:6c:f5:10:96:c4

可是假设WIFI在本次开机期间从来没有打开过，返回的MAC地址是不同的（非实际的），例如以下：

cat /sys/class/net/wlan0/address

00:90:4c:11:22:33

演示样例代码：

String getMac() {

                String macSerial = null;

                String str = "";

                try {

                        Process pp = Runtime.getRuntime().exec("cat /sys/class/net/wlan0/address");

                        InputStreamReader ir = new InputStreamReader(pp.getInputStream());

                        LineNumberReader input = new LineNumberReader(ir);

for (; null != str;) {

                                str = input.readLine();

                                if (str != null) {

                                        macSerial = str.trim();

                                        break;

                                }

                        }

                } catch (IOException e) {

                        e.printStackTrace();

                }

                return macSerial;

        }

==================================================================

3. 查询记录了MAC地址的文件“/proc/net/arp”，可是从測试结果看，返回的数据并非想要的Wifi Mac地址：

比方，手机实际的WIFI Mac地址是98:6c:f5:10:96:c4，但使用adb shell cat proc/net/arp返回的是：

cat proc/net/arp

IP address       HW type     Flags       HW address            Mask     Device

192.168.0.3      0x1         0x2         00:23:89:b9:1a:fd     *        wlan0

192.168.0.1      0x1         0x2         08:00:27:7c:65:5a     *        wlan0