How to take a screenshot on your Android phone

Once upon a time, in order to take a screenshot on an Android phone, you had to install the Android developer tools. These days, you can take screenshots on phones running Android 4.0 or later with the press of a couple buttons. On most Android phones, you can take a screenshot by holding down the Sleep/wake button and the volume-down button simultaneously. Hold these buttons down until your screen flashes. The process differs on some phone models, though. For example, on Samsung's Galaxy phones...