You can take screenshots of the emulator or handsets which is very useful for debugging as shown in figure below.
When you are using real devices, this screenshot aspect of DDMS perspective is very helpful. Follow below steps, to take a screen shot of your device and see what is happening.
1. Select your device or emulator from DDMS perspective. The device you are selecting must be connected with USB data cable.
2. Select your desired screen on the device or emulator.