https://qooah.com/2016/04/19/android-n-%e5%86%8d%e8%a2%ab%e6%8c%96%e5%87%ba%e6%96%b0%e5%8a%9f%e8%83%bd-vr-%e5%b0%87%e6%88%90%e5%a4%a7%e5%99%a8/