Android 獲取WIFI MAC地址的方法

原創

2020-02-22 10:37

1. 常用方法，調用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();

此方法需要保證WIFI在本次開機以來曾經是打開過的，否則會返回null。所以需要後臺嘗試先打開WIFI再獲取。

示例代碼：

//嘗試打開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;
}

//嘗試關閉MAC
private static void tryCloseMAC(WifiManager manager)
{
manager.setWifiEnabled(false);
}

//嘗試獲取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;
}

//嘗試讀取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;
    }

    //獲取失敗，嘗試打開wifi獲取
    boolean isOkWifi = tryOpenMAC(wifiManager);
    for(int index=0;index<internal;index++)
    {
        //如果第一次沒有成功，第二次做100毫秒的延遲。
        if(index!=0)
        {
            try
            {
                Thread.sleep(100);
            }
            catch (InterruptedException e)
            {
                e.printStackTrace();
            }
        }
        mac = tryGetMAC(wifiManager);
        if(!StringUtil.isNull(mac))
        {
            break;
        }
    }

    //嘗試關閉wifi
    if(isOkWifi)
    {
        tryCloseMAC(wifiManager);
    }
    return mac;
}

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

2. 查詢文件路徑 /sys/class/net/wlan0/address

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

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

但是如果WIFI在本次開機期間從來沒有打開過，返回的MAC地址是不同的（非實際的），如下：

cat /sys/class/net/wlan0/address
00:90:4c:11:22:33

示例代碼：

           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. 查詢記錄了MAC地址的文件“/proc/net/arp”，但是從測試結果看，返回的數據並不是想要的Wifi Mac地址：

比如，手機實際的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