The Android applications
Now, let's spend some time discussing applications—those things we write that provide value to the user. Android applications are made up of various types of classes and resources. The following sections describe the different types of classes or building blocks that an application can be composed of.
One of the most fundamental parts of an Android application is an activity. An activity provides a single function that a user can perform with an application such as list contacts, enter new contact, and display location(s) on a map. A single application is composed of many activities.
A user interacts with an activity through one or more Views, which are described later in this chapter. If you are familiar with ...