protected override void OnBtnImportV2ByQRCodeClick()
 {
     BarcodeScannerActivity.StartActivity(this,
                                          onScanCompleted: bytes =>
     {
         if (ViewModel !.ImportSteamPlusPlusV2B(bytes))
         {
             // 导入成功,关闭添加令牌页
             Activity?.Finish();
         }
     });