What event will be fired when the drawer is start to open/close?

[blueberry6401]

Hi,
I'm using Drawer Layout, having an issue: onDrawerOpen and onDrawerClose only be fired when drawer is fully open or close. Is there any event that can help me detect if drawer is start to open or close?
I tried onDrawerSlide, but it only work with gestures, not when I call open() or close().

[blueberry6401]

I'm able to detect the begin of open/close using onDrawerStateChanged.
Have to mention that onDrawerStateChanged have 2 values passed back, the first one is state, and the 2nd is drawer is about to open or close. The 2nd has no mention in the docs, it should be there.