Your computer must be running Mac OS X 10.7 and up. Your Android device must be running Android 3.0 and up.
Move files by USB.
Download and install Android File Transfer on your computer.
Open Android File Transfer. (The next time that you connect your device, it opens automatically.)
Unlock your Android device.
With a USB cable, connect your device to your computer.
On your device, tap the "USB for..." notification.
Select Transfer files.
An Android File Transfer window will open on your computer. Use it to drag files.
When you're done, unplug the USB cable.