https://qooah.com/2011/11/11/android-%e5%92%8c-ios-%e5%9c%a8%e4%be%bf%e6%94%9c%e5%bc%8f%e9%81%8a%e6%88%b2%e6%94%b6%e5%85%a5%e4%b8%8a%e8%b6%85%e4%bb%bb%e5%a4%a9%e5%a0%82%e5%92%8c%e7%b4%a2%e5%b0%bc/