protected void updateUpContentDescription() {
        final int upContentDesc = isMenuVisible() ? mDrawerOpenContentDesc : mDrawerClosedContentDesc;
        if (mDrawerIndicatorEnabled && mActionBarHelper != null && upContentDesc != mCurrentUpContentDesc) {
            mCurrentUpContentDesc = upContentDesc;
            mActionBarHelper.setActionBarDescription(upContentDesc);
        }
    }
Gets whether an overlay is drawn when sliding the drawer.

@return Whether an overlay is drawn when sliding the drawer.
menudrawer/src/net/simonvt/menudrawer/MenuDrawer.java