public boolean addItemUnique(Playlist p){
  if (!mPlaylists.contains(p)) {
    mPlaylists.add(p);
    return true;
  }
 else {
    return false;
  }
}

public boolean addItemUnique ( Playlist p ) { if ( ! mPlaylists . contains ( p ) ) { mPlaylists . add ( p ) ; return true ; } else { return false ; } }
adds the playlist to the adapter if it ' s not already there
