I do this .. but in a very roundabout fashion.
My Android devices all accept On-The-Go usb drives (some additional apps may be needed with some devices, but they're all free from the android market. {rooting the device may also be required. My Samsung Phone accepts the OTG straight off the cuff. My Nexus 7 needed rooted and a free app installed} )
Bearing in mind I don't have a standard CF memory card in my 400D, I have an adapter that allows me to plug a micro-SD card into it, and then the adapter into the camera, it opens up my options for data transfer to devices that don't have a CF reader slot. I've had trouble making my laptop see my camera at all via the data cable - tried three cables, all nada - hence the resort to micro-sd adapters etc.
You can get an OTG adapter lead to accept a normal usb drive for a couple of quid - and a usb/micro sd adapter for another couple.
Plug your camera card into the usb/micro sd adapter, the usb/micro sd adapter into the OTG adapter, and the otg adapter into your droid and any file manager such as ESFile Explorer will see the drive as new external storage.
http://www.ebay.co.uk/itm/DUAL-PORTS-SL ... 3f34018f0fhttp://www.ebay.co.uk/itm/USB-2-0-Micro ... 58b1f3307dhttp://www.ebay.co.uk/itm/MICRO-SD-TO-U ... 1576598180
I like him ... He says "Okie Dokie!"