Android How to Program, 3/e

4.1 Introduction

The Flag Quiz app tests your ability to correctly identify 10 flags from various countries and territories (Fig. 4.1). By default, the app presents a flag image and four country-name Buttons that you click to guess the answer—one is correct and the others are randomly selected, nonduplicated incorrect answers. The app displays the user’s progress throughout the quiz, showing the question number (out of 10) in a TextView above the current flag image.

Fig. 4.1 Flag Quiz app running on a smartphone in portrait orientation

Figure 4.1 Full Alternative Text

As you’ll see, the app also allows you to control the quiz difficulty by specifying ...