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).