https://qooah.com/2012/02/11/motorola-%e6%8c%87%e6%9f%90%e7%a8%8b%e5%ba%a6%e4%b8%8a%e7%a1%ac%e4%bb%b6%e5%9c%a8%e5%bd%b1%e9%9f%bf%e8%91%97-android-%e6%9b%b4%e6%96%b0%e9%80%9f%e5%ba%a6/