public boolean addToActiveList(DownloadInfoRunnable downloadInfoRunnable){
  return activeListHasRoom() && mActiveList.add(downloadInfoRunnable);
}

public boolean addToActiveList ( DownloadInfoRunnable downloadInfoRunnable ) { return activeListHasRoom ( ) && mActiveList . add ( downloadInfoRunnable ) ; }
tries to add a download object to the active list . will not work if the max number of downloads is already reached .
