https://qooah.com/2014/08/30/%e5%be%ae%e8%bb%9f%e5%8d%81%e5%88%86%e6%9c%89%e8%88%88%e8%b6%a3%e6%94%b6%e8%b3%bc%e8%91%97%e5%90%8dandroid%e7%ac%ac%e4%b8%89%e6%96%b9rom%e5%9c%98%e9%9a%8acyanogen/