Hide 3 Bottom Buttons (Back/Home/Recent) (Android full screen)-CodePudding

I am developing an app for price verification on an Android device (OS version 7.1.2, API Level 25) using .NET MAUI RC3.

I have managed to make the status bar at the top disappear, as well as the .NET MAUI navigation bar, using Shell.NavBarIsVisible="False", however, I'm stuck at trying to disable the Android navigation bar at the bottom:

I have tried:

NavigationPage.HasNavigationBar="False" in the
NavigationPage.HasNavigationBar="False" in the
NavigationPage.HasNavigationBar="False" in the

I have set this in the MainActivity, but it only removes the status bar at the top:

public class MainActivity : MauiAppCompatActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        this.Window.AddFlags(Android.Views.WindowManagerFlags.Fullscreen);
    }
}

The examples I found for hiding the navigation buttons all fail with syntax errors for various reasons:

DecorView doesn't have the SetSystemUiVisibility method
Android.Views.WindowManagerFlags doesn't have all the flags, such as "immersive", etc.
WindowInsetsController is not available in API version 25

Any help would be appreciated.

Thanks,

Joerg.

CodePudding user response：

In MainActivity.cs:

using Android.Views;
...
public class MainActivity : MauiAppCompatActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        this.Window.DecorView.SystemUiVisibility = (StatusBarVisibility)
            (SystemUiFlags.ImmersiveSticky | SystemUiFlags.HideNavigation |
             SystemUiFlags.Fullscreen | SystemUiFlags.Immersive);
    }
}

I don't know which of those flags are needed, so I set them all.

Tested on a newer device. But should work fine on an API-25 device.

SystemUiVisibility is marked as deprecated, but it still works.
If you set targetSdkVersion to API-31, you could add if-test to use WindowInsetsController where available. (Though it sounds like you have a specific device to run on, so not relevant to your situation.)

NOTE: targetSdkVersion and TargetFrameworkVersion do not have to be API-25; its fine if they are newer. Not sure how Maui is setting TargetFrameworkVersion. I think net6.0-android is defaulting to API-31. Causing the warning you see.