2. Welcome App

Objectives

In this chapter you’ll:

Image Learn the basics of the Android Developer Tools (the Eclipse IDE and the ADT Plugin), which you’ll use to write, test and debug your Android apps.

Image Use the IDE to create a new app project.

Image Design a graphical user interface (GUI) visually (without programming) using the IDE’s Graphical Layout editor.

Image Display text and two images in a GUI.

Image Edit the properties of GUI components.

Image Build and launch an app in the Android emulator.

Image Make the app more accessible to visually impaired people by specifying strings for use with Android’s TalkBack and Explore-by-Touch features.

Image Support internationalization so your app can display strings localized in different languages.

Outline

2.1 Introduction

2.2 Technologies Overview

2.2.1 Android Developer Tools IDE

2.2.2 TextViews and ImageViews

2.2.3 App Resources

2.2.4 Accessibility

2.2.5 Internationalization

2.3 Creating an App

2.3.1 Launching the Android Developer Tools IDE

2.3.2 Creating a New Project

2.3.3 New Android Application Dialog

2.3.4 Configure Project Step

2.3.5 Configure Launcher Icon Step

2.3.6 Create Activity Step

2.3.7 Blank Activity Step

2.4 Android Developer Tools Window

2.4.1 Package Explorer Window

2.4.2 Editor Windows

2.4.3 Outline Window

2.4.4 App Resource Files

2.4.5 Graphical Layout Editor

2.4.6 The Default GUI

2.5 Building the App’s GUI with the Graphical Layout Editor

2.5.1 Adding Images to the Project

2.5.2 Changing the Id Property of the RelativeLayout and the TextView

2.5.3 Configuring the TextView

2.5.4 Adding ImageViews to Display the Images

2.6 Running the Welcome App

2.7 Making Your App Accessible

2.8 Internationalizing Your App

2.9 Wrap-Up

Self-Review Exercises | Answers to Self-Review Exercises | Exercises

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