https://qooah.com/2012/02/16/%e6%9c%89%e5%82%b3%e8%81%9e%e6%8c%87-android-5-0-%e6%88%96%e6%96%bc%e4%bb%8a%e5%b9%b4%e7%ac%ac%e4%ba%8c%e5%ad%a3%e7%99%bc%e4%bd%88/