https://qooah.com/2012/04/03/%e5%88%86%e6%9e%90%e6%8c%87-google-%e5%be%9e%e6%af%8f%e9%83%a8-android-%e8%a8%ad%e5%82%99%e4%b8%ad%e6%af%8f%e5%b9%b4%e5%83%85%e7%8d%b2%e5%88%a9-1-7-%e7%be%8e%e5%85%83/