https://qooah.com/2012/04/09/android-4-0-%e5%8d%b3%e5%b0%87%e5%8a%a0%e5%85%a5%e5%90%8d%e7%82%ba-novalauncher-beta-%e7%9a%84%e6%96%b0%e5%8a%9f%e8%83%bd/