I propose a solution that there is an event like for MediaEnded, but for activated MediaButton.

[behemothe]

I try in vain, with COPILOT too, to retrieve the actions on the buttons of my bluetooth headphones via a BroadcastReceiver on the IntentFilter "android.intent.action.MEDIA_BUTTON".

I see them passing via adb.exe, they are passed to my application, but I do not receive anything. However, I do the same thing on Phone_State and there it works very well. I deduced that it is the MediaElement that I use that retrieves them. And MediaElement does not offer the possibility of having them.

So here I propose that there is an event like for MediaEnded, but for activated MediaButton.

This my code that don't work:

<public class MainActivity : MauiAppCompatActivity
{
   private PhoneCallReceiver _phoneCallReceiver;

   protected override void OnCreate(Bundle savedInstanceState)
   {
      base.OnCreate(savedInstanceState);
      IntentFilter filterPhone = new IntentFilter();
      filterPhone.AddAction("android.intent.action.MEDIA_BUTTON");
      filterPhone.AddAction("android.intent.action.PHONE_STATE");
      _phoneCallReceiver = new Platforms.Android.PhoneCallReceiver();
      if (Build.VERSION.SdkInt >= BuildVersionCodes.Tiramisu) // Android 33
      {
        RegisterReceiver(_phoneCallReceiver, filterPhone,    ReceiverFlags.Exported);
      }
      else
      {
        RegisterReceiver(_phoneCallReceiver, filterPhone);
      }
    }....
  Another file
    [BroadcastReceiver(Enabled = false, Exported = true)]
    public class PhoneCallReceiver : BroadcastReceiver
    {
      public delegate void PlayMusic();
      static public PlayMusic DelegatePlayMusic;
      static bool tantQuePasRacroche = false ;
      public override void OnReceive(Context context, Intent intent)
      {
        System.Diagnostics.Debug.WriteLine("MaMusique", intent.Action);
        if (intent.Action == "android.intent.action.PHONE_STATE")
        {
          System.Diagnostics.Debug.WriteLine("MaMusique",    "android.intent.action.PHONE_STATE");
          string state = intent.GetStringExtra(TelephonyManager.ExtraState);
          if (state == TelephonyManager.ExtraStateRinging)
          {
            // Traitement à effectuer lors d'un appel entrant
            //Toast.MakeText(context, "Appel entrant détecté",         ToastLength.Long).Show();
            if (!tantQuePasRacroche)
            {
              tantQuePasRacroche = true;
              DelegatePlayMusic();
            }
          }
          else if (state == TelephonyManager.ExtraStateIdle)
          {
            // Traitement à effectuer lors de la fin de l'appel
            //Toast.MakeText(context, "Appel terminé", ToastLength.Long).Show();
            DelegatePlayMusic();
            tantQuePasRacroche = false;
          }
        }
        else if (intent.Action == "android.intent.action.MEDIA_BUTTON")
        {
          // Traitement à effectuer lors de l'appui sur un bouton de         commande de la musique
          //Toast.MakeText(context, "Bouton de commande de la musique appuyé", ToastLength.Long).Show();
          System.Diagnostics.Debug.WriteLine("MaMusique", "android.intent.action.MEDIA_BUTTON");
          KeyEvent keyEvent;
          if (Build.VERSION.SdkInt >= BuildVersionCodes.Tiramisu) // Android 13 (API 33)
          {
            keyEvent = intent.GetParcelableExtra(Intent.ExtraKeyEvent, Java.Lang.Class.FromType(typeof(KeyEvent))) as KeyEvent;
          }
          else
          {
            keyEvent = (KeyEvent)intent.GetParcelableExtra(Intent.ExtraKeyEvent);
          }
          System.Diagnostics.Debug.WriteLine($"Sending KeyEvent multimédia appuyé keycode = {keyEvent.KeyCode}");
          if (keyEvent != null && keyEvent.Action == KeyEventActions.Down)
          {
            if (keyEvent.KeyCode == Keycode.MediaPlayPause)
            {
              //Gérer l'événement du bouton multimédia ici
              System.Diagnostics.Debug.WriteLine("MaMusique", "Sending KeyEvent Pause appuyé");

            }
            else if (keyEvent.KeyCode == Keycode.MediaNext)
            {
              //Gérer l'événement du bouton multimédia ici
              System.Diagnostics.Debug.WriteLine("MaMusique", "Sending KeyEvent Next  appuyé");
            }
            else if (keyEvent.KeyCode == Keycode.MediaPrevious)
            {
              //Gérer l'événement du bouton multimédia ici
              System.Diagnostics.Debug.WriteLine("MaMusique", "Sending KeyEvent Previous appuyé");
            }
            else if (keyEvent.KeyCode == Keycode.MediaPlay)
            {
              System.Diagnostics.Debug.WriteLine("MaMusique", "Sending KeyEvent Play appuyé");
            }
          }
        }
      }

And this is the manifest :

[behemothe]

This is proof that it is indeed MediaElement that has the reservation on Media Button :
17:06:16:080 Loaded assembly: /data/data/francois.rousset.ma.musique/files/.override/arm64-v8a/Xamarin.AndroidX.LocalBroadcastManager.dll [External]
17:06:16:080 [MediaSessionCompat] Couldn't find a unique registered media button receiver in the given context.
It is the Debug view on VS.

[behemothe]

So here I propose that there is an event like for MediaEnded, but for activated MediaButton.

[behemothe]

Here` is the solution I propose to handle the management of Media Button. There are three files to modify, the modifications made with the help of Copilot are tagged //frdp.
I renamed the ".cs" files to ".txt" to be able to pass them as an attachment. I do not know how Git works like that and I am not experienced enough to allow to do it.
You do what you want with it.
IMediaElement.txt
MediaElement.shared.txt
MediaManager.android.txt
To use it here is the code xaml:

<toolkit:MediaElement x:Name="video"
                      ShouldAutoPlay="True"
                      ShouldShowPlaybackControls="True"
                      HeightRequest="{OnPlatform 150, Android=50}"
                      BackgroundColor="Black" IsVisible="true" MediaEnded="OnMediaEnded" Grid.Row="0"      MediaFailed="video_MediaFailed" MediaButton="video_MediaButton" />

and c#

 private void video_MediaButton(object sender, IMediaElement.EventArgsButton e)
  {
    switch (e.Action)
    {
      case "Play":
        Play();
        break;
      case "Pause":
        Pause();
        break;
      case "Next":
        PlayNextFichierMusic();
        break;
      case "Previous":
        PlayPrecFichierMusic();
        break;
    }
  }