protected async override void OnCreate(Bundle savedInstanceState)
{
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
base.OnCreate(savedInstanceState);
IInstanceIdResult result = await FirebaseInstanceId.Instance.GetInstanceId().AsAsync <IInstanceIdResult>();
string token = result.Token;
string FcmKey = token.ToString();
Preferences.Set("FcmKey", FcmKey);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
ZXing.Mobile.MobileBarcodeScanner.Initialize(this.Application);
LoadApplication(new App());
}