public void removeExpiredAcronyms(){
  final String SELECTION_EXPIRATION=AcronymEntry.COLUMN_EXPIRATION_TIME + " <= ?";
  String[] selectionArgs={String.valueOf(System.nanoTime())};
}

public void removeExpiredAcronyms ( ) { final String SELECTION_EXPIRATION = AcronymEntry . COLUMN_EXPIRATION_TIME + " <= ?" ; String [ ] selectionArgs = { String . valueOf ( System . nanoTime ( ) ) } ; }
remove the expired acronyms from database .
