protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); Xamarin.Facebook.FacebookSdk.SdkInitialize(this); // Set our view from the "main" layout resource SetContentView(Resource.Layout.main_activity); toolbar = FindViewById <AndroidX.AppCompat.Widget.Toolbar> (Resource.Id.toolbar); messengerButton = FindViewById <View> (Resource.Id.messenger_send_button); toolbar.SetTitle(Resource.String.app_name); if (this.Intent.Action == Intent.ActionPick) { threadParams = MessengerUtils.GetMessengerThreadParamsForIntent(this.Intent); picking = true; } messengerButton.Click += MessengerButton_Click; }