https://qooah.com/2012/06/19/android-%e5%b9%b3%e6%9d%bf%e9%9b%bb%e8%85%a6%e4%bd%bf%e7%94%a8%e9%87%8f%e5%b7%b2%e7%b6%93%e6%8e%a5%e8%bf%91-ipad/