IN THIS CHAPTER
Creating an elementary Android app
Running an app on an emulator or a physical device
Adding buttons, text fields, and other components to an app
In a quiet neighborhood in south Philadelphia, there's a maternity shop named Hello World. I stumbled onto the store on my way to Pat's (to get a delicious Philly cheesesteak, of course), and I couldn't resist taking a picture of the store's sign.
Computer geek that I am, I'd never thought of Hello World as anything but an app. A Hello World app is the simplest program that can run in a particular programming language or on a particular platform.* Authors create Hello World apps to show people how to get started writing code for a particular system.
So, in this chapter, you make an Android Hello World app. The app doesn't do much. (In fact, you might argue that the app doesn't do anything!) But the example shows you how to create and run new Android projects.
A typical gadget comes with a manual. The manual's first sentence is “Read all 37 safety warnings ...