How to close an ActionMode menu programmatically?

這個 ActionMode 用起來滿神奇的，他幾乎算是一個特定區塊的dialog，但是和 dialog 不同的是會和上一個 activity overlap 在一起，並可以存取 parent fragment 或 activity 裡的變數內容，更像是 toolbar 的概念。

要開始／結束 ActionMode 是用：

Whenever you are creating/starting ActionMode Create by

mMode = startActionMode(....);

To Dismiss it use following Syntax

if (mMode != null) 
 {
     mMode.finish();
 }

from:
http://stackoverflow.com/questions/11158957/how-to-close-an-actionmode-menu-programmatically-on-honeycomb