The Android SDK provides various sample applications, one of which is the API Demos application. This application demonstrates how to use the various Android APIs through small, digestible, working examples. You find tons of simple straight-to-the-point examples in the API Demos source code. Perhaps you're interested in incorporating animation into your project, or you want to play an audio file inside your app — that's easy because the API Demos provide examples of both! If you have a lot of ideas but not a lot of time, you should definitely check out these cool examples. I recommend installing this demo app on your device and playing with each of the numerous examples to see exactly what they can do. Source code: In your Android SDK, in the samples folder.