protected override void OnCreate(Bundle savedInstanceState) { base.OnCreate(savedInstanceState); SetContentView(Resource.Layout.payment_activity); mDependencyHandler = new DependencyHandler( this, FindViewById <CardInputWidget>(Resource.Id.card_input_widget), FindViewById <ListView>(Resource.Id.listview)); Button saveButton = FindViewById <Button>(Resource.Id.save); mDependencyHandler.AttachAsyncTaskTokenController(saveButton); Button saveRxButton = FindViewById <Button>(Resource.Id.saverx); mDependencyHandler.AttachRxTokenController(saveRxButton); Button saveIntentServiceButton = FindViewById <Button>(Resource.Id.saveWithService); mDependencyHandler.AttachIntentServiceTokenController(this, saveIntentServiceButton); }