VirtualBox的鼠标

装了Android，发现没有鼠标，后来Google了一下，要把Absolute pointing device去掉：

手册里面是这么写的：

 Enable absolute pointing device

If enabled, VirtualBox reports to the virtual machine that a USB tablet device is present and communicates mouse events to the virtual machine through this device. If disabled, mouse events are communicated through a traditional PS/2 virtual mouse device. Using the virtual USB tablet has the advantage that movements are reported in absolute coordinates (instead of as relative position changes), which allows VirtualBox to translate mouse events over the VM window into tablet events without having to "capture" the mouse in the guest as described in the section called “Capturing and releasing keyboard and mouse”. This makes using the VM less tedious even if Guest Additions are not installed.^[11]

原来如果是触控板输入，那么这样可以把虚拟机和宿主机的位置统一起来，比较省心，但是如果是普通鼠标，不能勾上这一项。