recover the audioSession of the player being played

I'm trying to retrieve the audioSession of the current player on android in order to send it to the Visualizer class, but all attempts are not working.

I tried this:

 AudioManager audioManager = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE);
assert audioManager != null;
int audioSessionId = audioManager.generateAudioSessionId();

// Create the Visualizer object and attach it to our media player.
mVisualizer = new Visualizer(audioSessionId);
mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);

According to the documentation it is this way.