October 2012
Intermediate to advanced
408 pages
9h 38m
English
Content preview from Android Application Development For Dummies, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Creating an Alert Dialog Box
From time to time it may be necessary to alert the user to something that has happened. In the Task Reminder app, perhaps you want to display a welcome message and offer instructions on how to create a task. The Android system has a framework, built around dialog boxes that provide you with the implementation you may need.
Various types of dialog boxes are available:
Alert: Notifies the user of an important occurrence. Also allows you to set the text value of a button and the action to be performed when it’s clicked. As a developer, you can provide the AlertDialog with a list of items to display, allowing the user to select from a list of items.
Progress: Used to display a progress wheel or bar. This type of dialog box is created via the ProgressDialog class.
Custom: A custom dialog box created and programmed by you, the master Android developer. You create a custom dialog box class by extending the Dialog base class or using custom layout XML files.
Seeing why you should work with dialog boxes
If you’ve never worked with an application that failed to alert you, or warn you appropriately, consider the example of an e-mail client not notifying you that ...
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