2.1. Introduction

In this chapter, without writing any code you’ll build the Welcome app that displays a welcome message and two images. You’ll use the Android Developer Tools IDE to create an app that runs on Android phones. In later chapters you’ll also create apps that run on tablets or on both phones and tablets. You’ll create a simple Android app (Fig. 2.1) using the IDE’s Graphical Layout editor, which allows you to build GUIs using drag-and-drop techniques. You’ll execute your app in the Android emulator (and on an Android phone, if you have one available). Finally, you’ll learn how to make the app more accessible for people with disabilities and how to internationalize it to display strings localized in different languages. On the book’s website—http://www.deitel.com/books/AndroidHTP2—we provide an Android Studio IDE version of this chapter. This chapter assumes that you’ve read the Preface, Before You Begin and Section 1.9.

Fig. 2.1 | Welcome app running in the Android emulator.