https://qooah.com/2011/01/27/google-%e7%b5%82%e6%96%bc%e6%89%bf%e8%aa%8d-android-%e6%94%b6%e8%b2%bb%e8%bb%9f%e4%bb%b6%e4%b8%8b%e8%bc%89%e9%87%8f%e4%b8%8d%e4%bd%b3%ef%bc%8c%e8%a7%a3%e6%b1%ba%e8%be%a6%e6%b3%95%e5%91%a2%ef%b9%96/