https://qooah.com/2011/01/07/sony-%e5%ae%a3%e4%bd%88-xperia-x10%e7%b3%bb%e5%88%97%e5%b0%87%e4%b8%8d%e6%9c%83%e6%9c%89-android-2-2-%e8%a9%b2%e6%ad%bb%e7%9a%84/