public int decrementCurrentSongIndex(){
  if ((getCurrentSongIndex() - 1) > -1)   mCurrentSongIndex--;
  return mCurrentSongIndex;
}

public int decrementCurrentSongIndex ( ) { if ( ( getCurrentSongIndex ( ) - 1 ) > - 1 ) mCurrentSongIndex -- ; return mCurrentSongIndex ; }
decrements mcurrentsongindex by one . returns the new value of mcurrentsongindex .
