protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); // Set our view from the "main" layout resource SetContentView(Resource.Layout.acitivity_demo); _scrollView = FindViewById<ParallaxScrollView>(Resource.Id.scroll_view); _factorText = FindViewById<TextView>(Resource.Id.factor_text); _minus = FindViewById<Button>(Resource.Id.minus); _minus.SetOnClickListener(this); _plus = FindViewById<Button>(Resource.Id.plus); _plus.SetOnClickListener(this); }