CODEWITHSUNDEEP
c#xamarin.formscustom-renderer
Stamatis Stiliats
Stamatis Stiliats

Reputation: 399

NavigationPage rendere for android. Xamarin Forms

I am trying to access the actionbar from a custom renderer(i know i can use the toolbar.xml but it's not fitting my situation). Here is my code 

[assembly: ExportRenderer(typeof(NavigationPage), typeof(NoviNavigationPageRenderer))]
namespace NoviMobileTest.Droid.Renderers
{
    public class NoviNavigationPageRenderer : PageRenderer
    {

        protected override void OnLayout(bool changed, int l, int t, int r, int b)
        {
                base.OnLayout(changed, l, t, r, b);
                var actionBar = ((Activity)Context).ActionBar;
                actionBar.SetBackgroundDrawable(Resources.GetDrawable(Resource.Drawable.YourImageInDrawable));
        }
    }
}

variable actionbar is always null. I also tried extending NavigationRenderer but i get class cast exception. I've seen many people having the same issue but it's amazing that there are no examples out there to see. How am i suppose to get instance of the toolbar?

NOTE: my MainActivity extends FormsAppCompatActivity

Thanks in advance

Upvotes: 0

Views: 1357

Answers (1)

Wilson Vargas
Wilson Vargas

Reputation: 2899

Try installing CurrentActivity Plugin in your Android project and then like this:

using Plugin.CurrentActivity;
...
private static Android.Support.V7.Widget.Toolbar GetToolbar() => (CrossCurrentActivity.Current?.Activity as MainActivity)?.FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar);

Finally:

protected override void OnLayout(bool changed, int l, int t, int r, int b)
    {
            base.OnLayout(changed, l, t, r, b);
            var actionBar = GetToolbar();
            actionBar.SetBackgroundDrawable(Resources.GetDrawable(Resource.Drawable.YourImageInDrawable));
    }

For more information about this see: IconNavigationPageRenderer.cs

Upvotes: 3

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