https://qooah.com/2014/11/23/%e6%91%a9%e6%89%98%e7%be%85%e6%8b%89%e7%ad%89%e5%bb%a0%e5%95%86%e8%a1%9d%e6%93%8aandroid-one%e5%9c%a8%e5%8d%b0%e5%ba%a6%e5%b8%82%e5%a0%b4%e9%8a%b7%e9%87%8f%e4%b8%a6%e4%b8%8d%e6%a8%82%e8%a7%80/