I’m sure you’re ready to roll up your sleeves and write more code. However, there are a few topics in the realm of theory and design to cover in detail first. In this chapter, we’ll cover the basics of some essential building blocks, including the files, parts, and terms that make up a simple Android application; the
Activity class, which controls a single screen; the
Intent class, Android’s powerful communications class; and the
Application singleton class, which can be accessed from all your components. There is one more key component for your Android toolset, the
Fragment, but we’ll cover that later on; it’s not necessary to understanding the basics.
I recommend you open your IDE and follow along ...