Android TV app "Playing notification [card]"

[firemen01]

Google Play rejected the application for the following reason:
"Issue found: No Now Playing notification [card]"

Your App does not contain a “Now Playing” notification [card] for when the user has selected the HOME button within the app.
Please refer to our Displaying a Now Playing Card documentation for more details.

https://developer.android.com/training/tv/playback/now-playing"

how can this be implemented on delphi 12.1?

[DelphiWorlds]

Did you actually read what is at that link? It seems to tell you what you need to do. Do you have any existing code example of what you are doing?

[firemen01]

unfortunately I don't even know how to approach it.
I didn't find any examples of Delphi implementation on the Internet. I understand that there should be something like this:

procedure CreateMediaSession; 
var
  MediaSession: JMediaSession;
  PendingIntent: JPendingIntent;
  Intent: JIntent;
begin

  Intent := TJIntent.JavaClass.init(TAndroidHelper.Context, TMyActivity.JavaClass);
  PendingIntent := TJPendingIntent.JavaClass.getActivity(TAndroidHelper.Context, 99, Intent, TJPendingIntent.JavaClass.FLAG_UPDATE_CURRENT);

  MediaSession := TJMediaSession.JavaClass.init(TAndroidHelper.Context, StringToJString('MyMediaSession'));
  MediaSession.setFlags(TJMediaSession.JavaClass.FLAG_HANDLES_MEDIA_BUTTONS or TJMediaSession.JavaClass.FLAG_HANDLES_TRANSPORT_CONTROLS);
  MediaSession.setSessionActivity(PendingIntent);
  MediaSession.setActive(True);
end;

procedure UpdateMediaMetadata(MediaSession: JMediaSession; Title, Artist: string);
var
  Metadata: JMediaMetadata;
begin
  Metadata := TJMediaMetadata.JavaClass.init;
  Metadata.putString(TJMediaMetadata.JavaClass.METADATA_KEY_TITLE, StringToJString(Title));
  Metadata.putString(TJMediaMetadata.JavaClass.METADATA_KEY_ARTIST, StringToJString(Artist));  
  MediaSession.setMetadata(Metadata);
end;

procedure UpdatePlaybackState(MediaSession: JMediaSession; State: Integer);
var
  PlaybackState: JPlaybackState;
begin
  PlaybackState := TJPlaybackState.JavaClass.init;
  PlaybackState.setState(State, 0, 1.0, TJSystem.JavaClass.currentTimeMillis);
  
  MediaSession.setPlaybackState(PlaybackState);
end;

procedure StartPlaying;
begin
  CreateMediaSession; 
  UpdateMediaMetadata(MediaSession, 'Song Title', 'Artist Name'); 
  UpdatePlaybackState(MediaSession, TJPlaybackState.JavaClass.STATE_PLAYING); 
end;

procedure StopPlaying;
begin
  MediaSession.setActive(False); 
end;

[DelphiWorlds]

This line of code is not right:

Intent := TJIntent.JavaClass.init(TAndroidHelper.Context, TMyActivity.JavaClass);

It should be:

Intent := TJIntent.JavaClass.init;
Intent.setClassName(TAndroidHelper.Context.getPackageName, StringToJString('com.embarcadero.firemonkey.FMXNativeActivity'));

[firemen01]

If anyone has experience, please tell me, I sketched out an approximate code, everything comes together, when I start the application I activate the media session, when I start playing the song I update the metadata of the artist and the song title, but nothing appears on the Android device. what's wrong?

var
  MediaSession: JMediaSession;


implementation
uses
   Androidapi.JNI.GraphicsContentViewText,
   Androidapi.Helpers,
   DW.Androidapi.JNI.Os
   Androidapi.JNI.Media, Androidapi.JNI.App;

procedure CreateMediaSession(optActive: boolean);
var
  PendingIntent: JPendingIntent;
  Intent: JIntent;
begin

  if not optActive then begin
     if Assigned(MediaSession) then MediaSession.setActive(false);
     exit;
  end;

  Intent := TJIntent.JavaClass.init;
  Intent.setClassName(TAndroidHelper.Context.getPackageName, StringToJString('com.embarcadero.firemonkey.FMXNativeActivity'));

  PendingIntent := TJPendingIntent.JavaClass.getActivity(TAndroidHelper.Context, 99, Intent, TJPendingIntent.JavaClass.FLAG_UPDATE_CURRENT);

  MediaSession := TJMediaSession.JavaClass.init(TAndroidHelper.Context, StringToJString('myMediaSession'));
  MediaSession.setFlags(TJMediaSession.JavaClass.FLAG_HANDLES_MEDIA_BUTTONS or TJMediaSession.JavaClass.FLAG_HANDLES_TRANSPORT_CONTROLS);
  MediaSession.setSessionActivity(PendingIntent);
  MediaSession.setActive(True);

end;


procedure UpdatePlaybackState(State: Integer);
var
  PlaybackState: JPlaybackState_Builder;
  myPlaybackState: JPlaybackState;
begin
  if not Assigned(MediaSession) then exit;

  PlaybackState := TJPlaybackState_Builder.JavaClass.init;
  PlaybackState.setState(State, 0, 1.0, TJSystem.JavaClass.currentTimeMillis);
  myPlaybackState:= PlaybackState.build;
  MediaSession.setPlaybackState(myPlaybackState);
end;


procedure UpdateMediaMetadata(Title, Artist: string);
var
  MetadataBuilder: JMediaMetadata_Builder;
  Metadata: Jmedia_MediaMetadata;
begin
  if not Assigned(MediaSession) then exit;

  if title = '' then begin
    MediaSession.setMetadata(nil);
    exit;
  end;


  MetadataBuilder := TJMediaMetadata_Builder.JavaClass.init;
  MetadataBuilder.putString(TJmedia_MediaMetadata.JavaClass.METADATA_KEY_TITLE, StringToJString(Title));
  MetadataBuilder.putString(TJmedia_MediaMetadata.JavaClass.METADATA_KEY_ARTIST, StringToJString(Artist));
  Metadata := MetadataBuilder.build;
  MediaSession.setMetadata(Metadata);

  UpdatePlaybackState(TJPlaybackState.JavaClass.STATE_PLAYING);

end;

[firemen01]

If this cannot be implemented, then how can you at least track the event when the application starts running in the background when the user presses "home" to pause playback?
maybe then the application will be accepted for publication

[DelphiWorlds]

I've been working on an implementation for this - I'll update here later.