public class MainActivity implements WailCallback
{

WailMusicLibrary wLib;

@Override
public void onCreate()
{
  ...
  wLib = new WailMusicLibrary(context);

  //Method to start listening
  wLib.startServices();

  //Method to stop listening
  wLib.stopServices();

  ...
}

//Callback with track details
/**
  * This callback is called with the track details
  * Track has passed all checks
  * Scrobble the track
**/
public void scrobbleTrack(Bundle bundle)
{
  String mSong   = bundle.getString("SONG_NAME");
  String mArtist = bundle.getString("ARTIST_NAME");
  String mId     = bundle.getString("ALBUM_ID");
 ...
}

}