https://qooah.com/2012/03/18/%e8%aa%b0%e8%aa%aa-dell-%e5%b0%87%e6%8e%a8%e5%87%ba-android-%e5%b8%82%e5%a0%b4%ef%bc%8cdell-%e8%a1%a8%e7%a4%ba%e6%88%96%e6%9c%83%e7%b9%bc%e7%ba%8c%e6%8e%a8%e5%87%ba%e6%ae%ba%e6%89%8b%e7%b4%9a-androi-2/