How to check Audio is finished or not in just audio library?

there is a way to listen to state changes you can use that

      audioPlayer.playerStateStream.listen((state) {
        if (state.processingState == ProcessingState.completed) {
          onComplete();
        }
      });

use audioplayers: https://pub.dev/packages/audioplayers

 player.onPlayerCompletion.listen((event) {
    onComplete();
    setState(() {
      position = duration;
    });
  });