This simple application is already composed of a range of classes related to each other in via different types of relationships. We can capture this design graphically in UML, exploring the true nature of the structure of the app.

Android introduced a new user interface language to the world, one that is gradually evolving in flexibility and expressiveness. Here we review the principle elements of this language and how its is incorporated into attractive and usable applications

Here we take a quick look at JSON and how it can be used as a format for transferring data to and from an Android app.