Files can be easily transfered from an Android device to Windows computer using MTP (Media Transfer Protocol). Unfortunately this protocol is not supported in Finder which means that you need to connect your smartphone as hard drive – if this function is supported.
My Android 4.4.x ROM isn’t supporting this function anymore – fortunately there is an application called Android File Transfer that expands MTP to OS X.
The application can be downloaded for free on the Android website. Connected Android devices are automatically connected if the screen is unlocked – and copying files is working like a charm. 🙂