https://qooah.com/2011/07/12/android-%e6%89%8b%e6%a9%9f%e5%8f%83%e8%88%87%e5%8d%87%e7%a9%ba%e8%a8%88%e5%8a%83-nexus-s%e8%88%87%e4%ba%9e%e7%89%b9%e8%98%ad%e6%8f%90%e6%96%af%e7%9a%84%e5%a4%aa%e7%a9%ba%e4%bb%bb%e5%8b%99/