https://qooah.com/2011/11/14/%e5%82%b3%e8%a8%80-android-4-0-%e7%b3%bb%e7%bb%9f%e6%ba%90%e4%bb%a3%e7%a2%bc%e5%b0%87%e6%96%bc-11-%e6%9c%88-17-%e6%97%a5%e9%87%8b%e5%87%ba/