https://qooah.com/2011/08/23/hp-touchpad%e5%8f%af%e6%90%ad%e8%bc%89android%e7%b3%bb%e7%b5%b1-%e8%96%91%e9%a4%85%e8%9c%82%e7%aa%a9%e5%8d%b3%e5%b0%87%e9%99%8d%e8%87%a8/