UI/Application Exerciser Monkey

http://developer.android.com/tools/help/monkey.html

Don’t worry: The UI/Application Exerciser Monkey doesn’t need to be fed bananas to remain happy! You use Exerciser Monkey to stress-test your application. It simulates random touches, clicks, and other user events to ensure that abnormal usage doesn’t make the app explode. Exerciser Monkey can be used to test apps on either your emulator or your own device.