https://qooah.com/2012/10/06/samsung-galaxy-note-ii-%e6%9b%b4%e6%96%b0%e5%b0%87%e5%8a%a0%e5%85%a5%e3%80%8c-multi-window%e3%80%8d%e5%8a%9f%e8%83%bd/