Android How to Program, 3/e

2.2 Technologies Overview

This section introduces the technologies you’ll use to build the Welcome app.

2.2.1 Android Studio

In Section 2.3, you’ll use the Android Studio integrated development environment (IDE) to create a new app. As you’ll see, the IDE creates a default GUI that contains the text "Hello world!" You’ll then use the layout editor’s Design and Text views and the Properties window to visually build a simple graphical user interface (GUI) consisting of text and an image (Section 2.5).

2.2.2 LinearLayout, TextView and ImageView

GUI components in Android are called views. Layouts are views that contain and arrange other views. You’ll use a vertical LinearLayout to arrange the app’s text and image with each occupying half the ...