LOLCat

This is a great example if you are interested in image manipulation with Android. You find out how to take a picture using the device's camera, add captions to it, and then save the resulting file on the SD Card. You also discover how to create various intents, which allow you to send the image as an MMS (multimedia messaging service) image or as an e-mail attachment. Source code: http://code.google.com/p/apps-for-android.