Writing a Custom Counter Component

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Tutorial: Writing a Custom Counter Component

MIDP 2.0 introduced the javax.microedition.lcdui.CustomItem class. As the name implies, a developer can now create custom UI components by extending the CustomItem class. This tech tip designs and implements a UI component for displaying a numeric counter

Tutorial Details:

On occasion you may want your MIDP application to display a counter, for example to display the number of seconds elapsed since some operation started. It's fairly simple to write a custom component that automatically updates and displays such a counter. With a bit of careful coding you can even make it work with canvases, custom application-drawn screens derived from the Canvas class, and on forms, using the MIDP 2.0 CustomItem class.

The key to making a dual-purpose component is to separate the drawing of the component from its management. The reason is that there is no concept of a component when working with a canvas as a whole; the application itself must draw and manage the entire canvas. A custom item, on the other hand, is a true component; the system delegates drawing to the component but handles most of the management itself. To handle this difference, you define a callback interface that your component uses to delegate management tasks to the appropriate code.

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