Android Programming: The Big Nerd Ranch Guide, Third Edition

12 Dialogs

Dialogs demand attention and input from the user. They are useful for presenting a choice or important information. In this chapter, you will add a dialog in which users can change the date of a crime. Pressing the date button in CrimeFragment will present this dialog on Lollipop and later (Figure 12.1).

Figure 12.1  A dialog for picking the date of a crime

The dialog in Figure 12.1 is an instance of AlertDialog, a subclass of Dialog. AlertDialog is the all-purpose Dialog subclass that you will use most often.

When Lollipop was released, dialogs were given a visual makeover. AlertDialogs on Lollipop automatically ...