https://qooah.com/2014/09/12/android-%e6%9c%80%e6%96%b0%e5%b8%82%e5%a0%b4%e4%bb%bd%e9%a1%8d%e5%9c%96%e5%87%ba%e7%88%90-jelly-bean-%e4%be%9d%e7%84%b6%e6%98%af%e9%9c%b8%e4%b8%bb/