static boolean isExist(String libName,int version){
  String file=_targetSoFile(libName,version);
  File a=new File(file);
  return a.exists();
}

static boolean isExist ( String libName , int version ) { String file = _targetSoFile ( libName , version ) ; File a = new File ( file ) ; return a . exists ( ) ; }
tell whether the so is extracted .
