How to Listen for Volume Button Presses in .NET MAUI (iOS & Android)? - Stack Overflow

I'm developing a .NET MAUI app and want to detect when the user presses the volume up or down buttons on both iOS and Android. My goal is to trigger a function whenever the volume buttons are pressed.

I’ve searched for solutions, but I haven’t found a simple cross-platform way to achieve this in MAUI. I’m open to platform-specific implementations if needed.

Has anyone successfully implemented this? Any code examples or guidance would be greatly appreciated!

I'm developing a .NET MAUI app and want to detect when the user presses the volume up or down buttons on both iOS and Android. My goal is to trigger a function whenever the volume buttons are pressed.

I’ve searched for solutions, but I haven’t found a simple cross-platform way to achieve this in MAUI. I’m open to platform-specific implementations if needed.

Has anyone successfully implemented this? Any code examples or guidance would be greatly appreciated!

• maui
• cross-platform

Share Improve this question Follow asked Feb 11 at 11:26 Matan YaminMatan Yamin 1144 bronze badges 2

• There is no direct way of doing this, what you need to do is create native events that listen to it separately on each platform and then give you a callback in MAUI – FreakyAli Commented Feb 11 at 15:49
• .NET MAUI does not provide a direct API for this functionality. For Android, you can override the OnKeyDown and OnKeyUp methods in your MainActivity to detect volume button presses. For iOS, you need to use the MPVolumeView to detect volume button presses. – Guangyu Bai - MSFT Commented Feb 18 at 9:42

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1 Answer 1

Sorted by: Reset to default 0

First, you need to create an interface to abstract the platform-specific implementations.

// IVolumeButtonService.cs
public interface IVolumeButtonService
{
    event EventHandler VolumeButtonPressed;
}

Second, you can create a service to handle volume button presses in your Android project.

using Android.Views;
using Microsoft.Maui.Controls.Compatibility.Platform.Android;

[assembly: Dependency(typeof(VolumeButtonService))]
public class VolumeButtonService : IVolumeButtonService
{
    public event EventHandler VolumeButtonPressed;

    public bool OnKeyDown(Keycode keyCode, KeyEvent e)
    {
        if (keyCode == Keycode.VolumeUp || keyCode == Keycode.VolumeDown)
        {
            VolumeButtonPressed?.Invoke(this, EventArgs.Empty);
            return true;
        }
        return false;
    }
}

Then, you need to override the OnKeyDown and OnKeyUp methods in your MainActivity.

public override bool OnKeyDown(Keycode keyCode, KeyEvent e)
{
    var volumeService = DependencyService.Get<IVolumeButtonService>() as VolumeButtonService;
    if (volumeService != null && volumeService.OnKeyDown(keyCode, e))
    {
        return true;
    }
    return base.OnKeyDown(keyCode, e);
}

In your iOS project, please create a service to handle volume button presses.

using AVFoundation;
using MediaPlayer;
using UIKit;

[assembly: Dependency(typeof(VolumeButtonService))]
public class VolumeButtonService : IVolumeButtonService
{
    public event EventHandler VolumeButtonPressed;

    public VolumeButtonService()
    {
        var volumeView = new MPVolumeView();
        volumeView.ShowsVolumeSlider = false;
        volumeView.ShowsRouteButton = false;
        UIApplication.SharedApplication.KeyWindow.AddSubview(volumeView);

        foreach (var view in volumeView.Subviews)
        {
            if (view is UISlider slider)
            {
                slider.ValueChanged += (sender, e) =>
                {
                    VolumeButtonPressed?.Invoke(this, EventArgs.Empty);
                };
            }
        }
    }
}

In your .NET MAUI project, use the service to listen for volume button presses.

public MainPage()
    {
        InitializeComponent();
        var volumeService = DependencyService.Get<IVolumeButtonService>();
        volumeService.VolumeButtonPressed += OnVolumeButtonPressed;
    }

    private void OnVolumeButtonPressed(object sender, EventArgs e)
    {
        DisplayAlert("Volume Button Pressed", "A volume button was pressed!", "OK");
    }