https://qooah.com/2012/07/16/android-%e7%a2%8e%e7%89%87%e5%8c%96%e4%bb%a4%e9%83%a8%e4%bb%bd%e8%bb%9f%e4%bb%b6%e9%96%8b%e7%99%bc%e5%95%86%e6%94%af%e6%8c%81-ios/