protected override void OnElementChanged(ElementChangedEventArgs <DropDownMenuView> e) { base.OnElementChanged(e); if (e.NewElement != null) { _dropDownView = (DropDownMenuView)e.NewElement; if (Control == null) { Android.Widget.RelativeLayout wraper = new Android.Widget.RelativeLayout(Android.App.Application.Context); ContextThemeWrapper theme = new ContextThemeWrapper(Android.App.Application.Context, Mobile.Droid.Resource.Style.Base_Widget_AppCompat_TextView_SpinnerItem); _nativeView = new Spinner(theme); _nativeView.OnItemSelectedListener = this; if (Android.OS.Build.VERSION.SdkInt < Android.OS.BuildVersionCodes.M) { _nativeView.SetBackgroundResource(Mobile.Droid.Resource.Drawable.abc_btn_borderless_material); } else { wraper.SetBackgroundResource(Mobile.Droid.Resource.Drawable.abc_btn_borderless_material); } _nativeView.LayoutParameters = new Android.Widget.RelativeLayout.LayoutParams(LayoutParams.MatchParent, LayoutParams.MatchParent); _dropDownView.SetItemSelection = (i) => { _nativeView.SetSelection(i); }; ImageView downIcon = new ImageView(Android.App.Application.Context); var param = new Android.Widget.RelativeLayout.LayoutParams(20, 20); param.AddRule(LayoutRules.AlignParentRight); param.AddRule(LayoutRules.CenterInParent); param.SetMargins(0, 0, 14, 0); downIcon.LayoutParameters = param; downIcon.SetImageResource(Mobile.Droid.Resource.Drawable.abc_ic_arrow_drop_right_black_24dp); wraper.AddView(_nativeView); wraper.AddView(downIcon); SetNativeControl(wraper); } if (_dropDownView.ItemsSource != null) { SetApdater(); } } }