Working with BlackBerry list fields – Tutorial

This tutorial will show you how to create non-trivial lists using ListField. I will create a sample program that allows you to create, remove, update, delete the contents of a list (that’s backed by a Vector). The list field contains rows of selectable list items. It allows you to display a list of items, and load this list of objects from an array or vector. When using a ListField you have to provide an implementation of the ListFieldCallback interface to perform drawing tasks. This callback constitutes the view and model (using MVC terminology). The controller is the ListField class.

BlackBerry field borders and backgrounds – Tutorial

This tutorial will show you how to create field (component) backgrounds and borders (decoration). Each field can have a border and a background property. You can use the border to space out fields in your UI, and you can use them to add whitespace. The background allows you to set the background color property of your field and make it fit the look for your app.

Using the BlackBerry gauge field to display progress – Tutorial

This tutorial will show you how the use the gauge field to show progress in your apps. This is useful when your app is performing long running tasks that need to report feedback to the user. The gauge field is a horizontal component that can be used to display status or progress. It displays a percentage from 0 to 100 and you can set a label before it to display any progress/status messages. You can even overlay the label inside of the gauge field, so that it won’t be displayed before it, but inside of it (on top of the progress bar that’s drawn).

Asking for BlackBerry application permissions upfront – Tutorial

This tutorial will show you how to ask a user (of your BlackBerry app) for permissions that are required in order for your app to function properly. There are many APIs in the RIM API that will cause a prompt to be displayed in the BlackBerry UI that will require a user to provide explicit permission to access certain API functionality or access to certain hardware features or data on the device. Instead of interrupting the UI, it’s possible to ask the user for all of these permissions at the very beginning. By the way, if the user does not grant permissions when this popup appears, then an exception will be thrown which you have to deal with.

Working with BlackBerry screens – Tutorial

In this tutorial, I will show you how to quickly manage screens using the RIM UI API. The BlackBerry OS maintains a stack of screens, and your app can be pushed and popped from this stack. These are normal screen display operations. You can even hide your screen from the display, and it will show the BlackBerry home screen. You can close the screen as well.