Android Programming: The Big Nerd Ranch Guide, 2nd Edition

Challenge: From Button to ImageButton

Perhaps the user interface would look even better if the next and previous buttons showed only icons, as in Figure 2.15.

Figure 2.15  Icon-only buttons

To accomplish this challenge, these two widgets must become ImageButtons instead of regular Buttons.

ImageButton is a widget that inherits from ImageView. Button, on the other hand, inherits from TextView. Figure 2.16 shows their different inheritance hierarchies.

Figure 2.16  Inheritance diagram for ImageButton and Button

You can replace the text and drawable attributes on the Next button with a single ImageView ...