Android携帯電話MACを取得する方法

Android携帯電話MACの実装案を取得し、参考にしてください.ハハハ!他にもっと優れた解決策はありますか?
高バージョンではWiFiがオフの場合、MAC`/**が取得できません.*param context * @return */

public static String getWlanMac(Context context){

    String mac = getWlanMacWifiManager(context);
    if(mac == null){
        //       
        mac = getWlanMacLocalAddress();
        if(mac == null){
            // java      
            mac = getWlanMacInterface();
            if(mac == null){
                //        
                mac = Pref.getString("wlan_mac_cached", context);
            }
        }
    }
    if(mac != null){
        //  mac ，        ；  MAC    
        Pref.saveString("wlan_mac_cached", mac, context);
    }

    return mac;


/**
 *  WifiManager      MAC；
 * @param context
 * @return
 */
public static String getWlanMacWifiManager(Context context){

    Log.i("DeviceUtil","get mac by WifiManager...");

    String mac = null;
    WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE); 
    boolean isWifiEnabled = wifiManager.isWifiEnabled();
    if(!isWifiEnabled){
        //6.0            ，              
        wifiManager.setWifiEnabled(true);
    }
    if (isWifiEnabled) {
        WifiInfo wifiInfo = wifiManager.getConnectionInfo(); 
        if (wifiInfo != null) {
            mac = wifiInfo.getMacAddress();
            if(CheckUtils.isMacRight(mac)){
                Log.i("DeviceUtil","mac = " + mac);
                return mac;
            }else{
                mac = null;
            }
        }
    }
    return mac;
}

/**
 *          MAC；
 * @param context
 * @return
 */

public static String getWlanMacLocalAddress(){
    Log.i("DeviceUtil","get mac by local address...");
    String mac = null;
    String path = "/sys/class/net/wlan0/address";
    File wlan0 = new File(path);
    if(wlan0.exists() && wlan0.isFile()){
        mac = execCmd("cat " + path);
        if (CheckUtils.isMacRight(mac)) {
            return mac;
        }else{
            mac = null;
        }
    }
    return mac;
}

private static String getWlanMacInterface() {

    Log.i("DeviceUtil","get mac by new interface..." );

    String mac = null;
    try {
        List all = Collections.list(NetworkInterface.getNetworkInterfaces());  
        for (NetworkInterface nif : all) {  
            if (!nif.getName().equalsIgnoreCase("wlan0")) {
                continue;
            }

            byte[] macBytes = nif.getHardwareAddress();  
            if (macBytes == null) {  
                return mac;  
            }  

            StringBuilder builder = new StringBuilder();  
            for (byte b : macBytes) {  
                builder.append(String.format("%02X:",b));  
            }  

            if (builder.length() > 0) {  
                builder.deleteCharAt(builder.length() - 1);  
            }
            mac = builder.toString();
            Log.i("DeviceUtil","mac = " + mac);
        }  
    } catch (Exception e) {
        e.printStackTrace();
    }

    return mac;  
} 

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