Book Image

BlackBerry Java Application Development

Book Image

BlackBerry Java Application Development

Overview of this book

BlackBerry Smartphone was once the domain of jet-setting business users with power suits. Now you can hardly go anywhere without seeing someone using a BlackBerry to check their messages or make a call. It's this kind of explosive growth that makes the BlackBerry ecosystem a great place to develop and market applications through the BlackBerry App World store—this book shows you how to do just that! This step-by-step guide gives you a hands-on experience of developing innovative Java applications for your BlackBerry. With the help of this book, you will learn to build your own applications to illustrate the platform, and the various capabilities that developers can use in their programs. It explores the powers of Blackberry and helps you develop professional and impressive Java applications. The book teaches how to write rich, interactive, and smart BlackBerry applications in Java. It expects the readers to know Java but not Java Mobile or the BlackBerry APIs. We will learn to build rich, interactive, and smart Java applications for the BlackBerry. The book will cover UI programming, data storage, programming network, and internet API apps. As we move on, we will learn more about the BlackBerry's device features, such as messaging, GPS, multimedia, contacts and calendar, and so on.This book also helps you build your own applications to illustrate the platform, and the various capabilities that developers can use in their programs.
Table of Contents (18 chapters)
BlackBerry Java Application Development
Credits
About the Author
Acknowledgement
About the Reviewers
Preface

LabelField


A LabelField is another very simple class, just slightly more complicated than a SeparatorField. A LabelField displays some text in a read-only manner, which is only fitting for a label. The LabelField does not receive focus, so as the user scrolls around the screen the cursor will simply jump over the LabelField.

In the FieldSampler skeleton application, we put a LabelField in the title portion of the MainScreen. This is one of the most common uses of a LabelField. However, they can be used for any other descriptive text needed on the screen. Maybe the label portion of an editable field has so much text that it really needs to be split into two lines of text—the second line should be done with a LabelField. Or, you could have a large multiline edit field but using the label in that field just doesn't look good. In this case, you can place a LabelField before the multiline edit field to properly label the field's purpose.