记录一下，直接调用系统的方法，实际测试可以获取，
注意：需要申请wifi相关权限，同时还有定位权限，Android 10中必须具有 ACCESS_FINE_LOCATION 权限才能使用
public static String getConnectedWifiMacAddress(Context context) {
String connectedWifiMacAddress = null;
WifiManager wifiManager = (WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
List<ScanResult> wifiList;
if (wifiManager != null) {
wifiList = wifiManager.getScanResults();
WifiInfo info = wifiManager.getConnectionInfo();
if (wifiList != null && info != null) {
for (int i = 0; i < wifiList.size(); i++) {
ScanResult result = wifiList.get(i);
if (info.getBSSID().equals(result.BSSID)) {
connectedWifiMacAddress = result.BSSID;
}
}
}
}
return connectedWifiMacAddress;
}