User Guide

How to develop Java

Applications for the Nokia 9210 Communicator

Version 1.1

Screen size (resolution 640 x 200) should be taken into account. The developer should also

notice that certain areas in the display make use of the screen. Figure 1 shows a typical

screenshot of the Nokia 9210 Communicator display. The Indicator and Command Button Areas

have two different sizes or they can be hidden.

FIGURE 1. Typical view of the Nokia 9210 Communicator screen

3.2 Abstract Window Toolkit (AWT) interfaces

The Java programming language provides a class library called the Abstract Window Toolkit

(AWT) that contains a number of common graphical widgets. You can add these widgets to your

display area and position them with a layout manager.

A typical UI designed for a PC screen may not be efficient enough in the screen of the Nokia

9210 Communicator. It is recommended that application developers take advantage of the

Crystal platform's UI features. Certain APIs for Nokia 9210 Communicator specific display

features are included:

• Command Button Area API

• Status Pane API

• Virtual Cursor API

3.3 Command Button Area API

The Command Button Area is the recommended method of allowing the user to choose

commands simply and rapidly. Crystal provides a class in the com.symbian.epoc.awt package that

allows Java programs to create Command Button Areas and receive events from them. The API

can be used by both applets and applications.