https://qooah.com/2012/02/15/htc-sense-4-0-%e7%95%8c%e9%9d%a2%e6%9b%9d%e5%85%89-%e6%9b%b4%e9%ab%98%e5%ba%a6%e7%9a%84-dropbox-%e6%95%b4%e5%90%88%e6%80%a7/