bitwarden-android/src/Android/Controls/ExtendedNavigationPage.cs

using Android.App;
using Android.Graphics.Drawables;
using Bit.Android.Controls;
using Bit.App.Controls;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(ExtendedNavigationPage), typeof(ExtendedNavigationRenderer))]
namespace Bit.Android.Controls
{
    public class ExtendedNavigationRenderer : NavigationRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<NavigationPage> e)
        {
            base.OnElementChanged(e);

            RemoveAppIconFromActionBar();
        }

        private void RemoveAppIconFromActionBar()
        {
            // ref: http://stackoverflow.com/questions/14606294/remove-icon-logo-from-action-bar-on-android
            var actionBar = ((Activity)Context).ActionBar;
            actionBar.SetIcon(new ColorDrawable(Color.Transparent.ToAndroid()));
        }
    }
}