public boolean isRunning(){
 ...
}

private boolean isPlaying = false;
private Track track;
 
 ...
 
 public void play(){
    if (!isPlaying){
       this.isPlaying = true;
      track.play();
    }
 }
 
  public void stop(){
     if ( isPlaying){
         this.isPlaying = false;
        track.stop();
    }
   }