“How do I take a screen shot on my Galaxy Nexus Android phone?”
Taking a screenshot on your Samsung Galaxy Nexus running Android 4.0 or higher is super easy because this feature is built into the operating system.
How to take screenshot on Android 4.0 or later:
Press the ‘Power’ button and the ‘Volume Down’ button at the same time and hold it there for about 1 second. The phone will take a snapshot of the screen.
You can find the screenshot picture(s) in your Gallery application.
If you are running an earlier version of Android try press and holding the Power button and Home button. Or press and hold the Power and Back button.