How to change navigation page back button in xamarin forms

Question

I am trying to change back arrow image in navigation page. For this in android app i created navigation page renderer and then using method toolbar.SetNavigationIcon and its

Answer 1

I solved this the next way: In my MainActivity i am added static toolbar property and identified it in OnCreateOptionsMenu

    public static Toolbar ToolBar { get; private set; }

    public override bool OnCreateOptionsMenu(IMenu menu)
    {
        ToolBar = FindViewById(Resource.Id.toolbar);
        ToolBar.SetNavigationIcon(Resource.Drawable.arrow);
        return base.OnCreateOptionsMenu(menu);
    }

    protected override void OnCreate(Bundle bundle)
    {
        TabLayoutResource = Resource.Layout.Tabbar;
        ToolbarResource = Resource.Layout.Toolbar;
        ....
    }

Then in PageRenderer:

protected override void OnElementChanged(ElementChangedEventArgs e)
{
     base.OnElementChanged(e);
     MainActivity.ToolBar?.SetNavigationIcon(Resource.Drawable.arrow);
}

But!! From 2 ways i have bad effect with redrawing

Usage:

async void tapImage_Tapped(object sender, EventArgs e)
{
     await Navigation.PushAsync(new ChooseGenrePage(_listGenres));
}