static String buildKeySelection(int selectionCount){
  String[] list=new String[selectionCount];
  Arrays.fill(list,"?");
  return KEY_COLUMN + " IN (" + TextUtils.join(", ",list)+ ")";
}

static String buildKeySelection ( int selectionCount ) { String [ ] list = new String [ selectionCount ] ; Arrays . fill ( list , "?" ) ; return KEY_COLUMN + " IN (" + TextUtils . join ( ", " , list ) + ")" ; }
build the string required for an sql select statement : where key in ( ? , ? , . . . , ? ) without ' where ' and with selectioncount ' ? '
