https://qooah.com/2011/02/22/nec%e5%b0%87%e6%8e%a8%e5%87%ba%e4%b8%96%e7%95%8c%e4%b8%8a%e6%9c%80%e8%96%84%e7%9a%84android%e6%99%ba%e8%83%bd%e6%89%8b%e6%a9%9f/