Implementation

HelloWorld class

The HelloWorld class defines the look and feel of the MIDlet. It simply lays out the text and adds the exit command for exiting the MIDlet.

To implement the HelloWorld class, add the following code:

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ercp.swt.mobile.Command;

public class HelloWorld extends SWTMIDlet {

    public void runUI(Display display) {
        Shell shell = new Shell(display);
        Command exitCommand = new Command(shell, Command.EXIT, 0);
        exitCommand.setText("Exit");
        exitCommand.addSelectionListener(new SelectionListener() {

            public void widgetSelected(SelectionEvent arg0) {
                exit();
            }

            public void widgetDefaultSelected(SelectionEvent arg0) {
            }
        });
        shell.setLayout(new FillLayout());
        Label label = new Label(shell, SWT.HORIZONTAL);
        label.setText("Hello, world!");
        shell.open();
    }
}

eSWT MIDlet starter

To make developing eSWT MIDlets faster and easier, the Java Developer's Library provides an eSWT MIDlet starter, consisting of two classes, which you can use as a basis for implementing MIDlets with eSWT UIs. The starter creates the eSWT UI thread and also manages the MIDlet lifecycle for you. If supported by the device, the starter uses the org.eclipse.ercp.swt.midp.UIThreadSupport class to safely obtain a platform-optimized thread for the eSWT UI. Otherwise, the starter creates a random thread for the UI.