The API Demos application includes a variety of small applications that illustrate the use of various Android APIs. It includes samples of: - Notifications - Alarms - Progress Dialogs - Intents - Menus - Search - Persistent application state - Background Services - App Widgets - Voice Recognition - And many many more... Api demos is designed to use the compatibility library "android-support-v4.jar". It is available through the SDK Updater in the "Android Compatibility package". Once downloaded, copy the jar file into the ApiDemos project libs/ folder. (If using Eclipse, add it manually to the project build path).