https://qooah.com/2012/01/28/android-%e5%b9%b3%e6%9d%bf-2011-q4-%e5%b8%82%e4%bd%94%e7%8e%87%e6%bf%80%e5%a2%9e%ef%bc%8c%e5%bf%ab%e8%83%bd%e5%8f%96%e4%bb%a3-ipad-%e6%88%90%e7%88%b2%e4%b8%bb%e5%b0%8e/