LCDUI - Simple Test MIDlet

This section provides the source code for the Simple Test MIDlet example. For the complete Eclipse project ZIP file, see Forum Nokia.

The example includes the following classes:

• SimpleTest

• HelloCanvas

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class SimpleTest extends MIDlet implements CommandListener
{	
	private HelloCanvas myCanvas;
	private Form myForm;
	private Gauge myGauge;
	private TextField textField;
	private Command backCommand = new Command("Back", Command.BACK, 1);
	private Command messageCommand = new Command("Message", Command.SCREEN,1);
    private Command displayCommand = new Command("Display Message", Command.SCREEN,1);
    private Command exitCommand = new Command("Exit", Command.EXIT, 1);
    private Command showCommand = new Command("Show Levels", Command.SCREEN, 1);
	
    public SimpleTest(){	
		myCanvas = new HelloCanvas();
		myCanvas.addCommand(backCommand);
		myCanvas.addCommand(messageCommand);
		myForm = new Form("Gauge level");
		myGauge = new Gauge("Value", true, 120, 10);
		textField = new TextField("Enter number", "", 3, TextField.NUMERIC);
		myForm.append(myGauge);
		myForm.append(textField);
		myForm.addCommand(showCommand);
		myForm.addCommand(displayCommand);
		myForm.addCommand(exitCommand);
		myCanvas.setCommandListener(this);
		myForm.setCommandListener(this);			
	}
    
	public void startApp(){
		Display.getDisplay(this).setCurrent(myForm);
	}
	
	public void pauseApp(){}
	
	public void destroyApp(boolean a) throws MIDletStateChangeException{}
	
	public void commandAction(Command c, Displayable d){
		if (c == exitCommand){
			notifyDestroyed();
		}
		if (c == messageCommand){
			myCanvas.newMessage();
			//myCanvas.start();
		}
		if (c == backCommand){	
			Display.getDisplay(this).setCurrent(myForm);
		}			
		if (c== displayCommand){
			Display.getDisplay(this).setCurrent(myCanvas);
			myCanvas.start();
		}
		if (c==showCommand){
			String valueString = textField.getString();
			int value = 0;
			if (!valueString.equals("")) { 
				value = Integer.parseInt(valueString);
			}
			myGauge.setValue(value);
		}
	}
}

import javax.microedition.lcdui.*;

public class HelloCanvas extends Canvas
{
	boolean myCanvasTXT = true;
	
	public HelloCanvas()
	{
	}
	
	void start(){
		repaint();
	}

	public void newMessage(){
		myCanvasTXT = !myCanvasTXT;
		repaint();
	}
	
	public void paint(Graphics g){
		int w = getWidth();
		int h = getHeight();
		g.setColor(0xffff00);
		g.fillRect(0, 0, w, h);
		//display the message
		if(myCanvasTXT){
			Font font = g.getFont();
			int fontHeight = font.getHeight();
			int fontWidth = font.stringWidth("CANVAS FONT");
			//set the text color
			g.setColor(0x00ff0000);
			g.setFont(font);
			//write the strings in the center of the screen
			g.drawString("CANVAS FONT !!!", (w-fontWidth)/2, (h-fontHeight)/2, Graphics.TOP | Graphics.LEFT);
		}		
	}
}