android studio中的getBSSID（）

我正在尝试获取WiFi的BSSID，但我总是获得02:00:00:00:00。如何获取Wifi MAC地址

在android清单中-

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

WifiManager wifiMgr = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiMgr.getConnectionInfo();
Toast.makeText(UserDashboardActivity.this,"macAddress " + wifiInfo.getBSSID(),Toast.LENGTH_LONG).show();