Remove Actionbar from android app

[ashah7]

I'm trying to remove the actionbar from my android app but having no success.
The code in the style.xml from a newly built app indicates that it's hidden by default, but it continues to show regardless.

 <item name="windowActionBar">false</item>
    <item name="android:windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="android:windowNoTitle">true</item>

I have tried to use the below without success
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

And the below

  if (ActionBar != null)
        {
            ActionBar.Hide(); // Hide ActionBar if it exists
        }

Even in full screen mode the title/action bar does not hide

[morning4coffe-dev]

Hey @ashah7,

Thank you for your questions. I am not sure, if works with the recent versions of Android, but you can set your app to full screen like this:

public class MainActivity : Microsoft.UI.Xaml.ApplicationActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        if (SupportActionBar != null)
        {
            SupportActionBar.Hide();
        }

        if (Build.VERSION.SdkInt >= BuildVersionCodes.R)
        {
            Window.SetDecorFitsSystemWindows(false);
            var controller = Window.InsetsController;
            if (controller != null)
            {
                controller.Hide(WindowInsets.Type.StatusBars() | WindowInsets.Type.NavigationBars());
                controller.SystemBarsBehavior = default;
            }
        }
        else
        {
            Window.DecorView.SystemUiVisibility = (StatusBarVisibility)(
                SystemUiFlags.LayoutStable |
                SystemUiFlags.LayoutHideNavigation |
                SystemUiFlags.LayoutFullscreen |
                SystemUiFlags.HideNavigation |
                SystemUiFlags.Fullscreen |
                SystemUiFlags.ImmersiveSticky
            );
        }
    }
}

You can also play around with the OnWindowFocusChanged so the full screen stays on even if the user navigates out. Let me know if this helps.

[ashah7]

sadly this doesn't seem to work, on Android 15,14. I was using full screen anyway using the below code.

 Window.DecorView.SystemUiVisibility = (StatusBarVisibility)(
       SystemUiFlags.LayoutStable |
       SystemUiFlags.LayoutFullscreen |
       SystemUiFlags.Fullscreen |
       SystemUiFlags.HideNavigation |
       SystemUiFlags.ImmersiveSticky);

Even for a default android new built app the title/action bar does not hide. I'm considering this could be a bug

[morning4coffe-dev]

@ashah7 Interesting, have you checked the controller.Hide as well? It seems to mostly work on my side with Android 14 phone emulator. If it doesn't work on tablet, it could be a bug directly in Android or coming from .NET mobile as this is a platform specific code, which is not a part of Uno itself.

[ashah7]

So I started a brand new demo app using .net 9 and started it using a visual 2022 emulator on one of the phones (phone_m-dpi_3_2in) and put in the above code an the title bar is still showing. When I close uno and open a normal browser it doesn't show).
This seriously seems like basic functionally or I'm just being silly...

[morning4coffe-dev]

@ashah7 I see! I think you mean the NavigationBar which showcases the title?

Sorry if I misunderstood your original question, those are two separate parts. You can find the utu:NavigationBar in your MainPage (or any other pages) and either remove it, or disable it.
For example: https://github.com/morning4coffe-dev/recurrents/blob/d108142eadac83e27301dbcf26256138797836c2/src/Recurrents/Presentation/HomePage.xaml#L70C12-L70C29. Let me know, if this helps.

[kazo0]

@ashah7 so these are actually two different things you are seeing. The native Android code you have is properly removing the status bar, but what you are still seeing is the NavigationBar control. If you look at the XAML for this page, is there a defined somewhere?

[ashah7]

thanks all I managed to fix it once you guys told me it was called the "navigationbar" and not "actionbar" d'oh

<utu:NavigationBar Content="{Binding Title}" Visibility="Collapsed" />