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()); }