This J2ME sample program shows how to CHANGE THE FONT SIZE and CHANGE COLOR.

Having worked with many different J2ME devices, I have come across many phones with small displays or small defaul fonts and sizes. However in real time usage, most of the times the customer needs a bigger font size. This sample J2ME code shows how to increase or change the font size according to our requirement.

/*
*
* A free J2ME sample program
* to CHANGE THE FONT SIZE of the display and CHANGE COLOR
*
* @author William Alexander
* free for use as long as this comment is included
* in the program as it is
*
* More Free Java programs available for download
* at http://www.java-samples.com
*
*/
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import java.io.*;
import java.lang.*;
import javax.microedition.io.*;
import javax.microedition.rms.*;

public class changeFont extends MIDlet { public static final boolean COLOR = false;
public static final boolean DEBUG = false; public static final int WHITE = 0xFFFFFF;
public static final int BLACK = 0x000000;
public static final int BLUE = 0x0000FF;
public static final int LIGHT_GRAY = 0xAAAAAA;
public static final int DARK_GRAY = 0x555555;


private Display myDisplay = null;

private DecodeCanvas decodeCanvas = null;

private boolean painting = false;

public changeFont() {

myDisplay = Display.getDisplay(this);
decodeCanvas = new DecodeCanvas(this);

}


public void startApp() throws MIDletStateChangeException {
myDisplay.setCurrent(decodeCanvas);
}


public void pauseApp() {


}


protected void destroyApp(boolean unconditional)
throws MIDletStateChangeException {
}


class DecodeCanvas extends Canvas {
private changeFont parent = null;

private int width = getWidth();
private int height = getHeight();


public DecodeCanvas(changeFont parent) {
this.parent = parent;

}

public void paint(Graphics g) {


g.setColor(WHITE);
g.fillRect(0, 0, width, height);


Font f1 = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_LARGE);
Font f2 = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM);
Font f3 = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_SMALL);
int yPos = 0;
if (COLOR)
g.setColor(BLUE);
else
g.setColor(LIGHT_GRAY);

g.fillRect(0, yPos, width, f1.getHeight());

if (COLOR)
g.setColor(WHITE);
else
g.setColor(BLACK);
g.setFont(f1);
g.drawString("BIG FONT", 0, yPos, Graphics.LEFT | Graphics.TOP);
yPos = yPos + f1.getHeight() + 10;
g.setFont(f2);
// g.drawLine(0, f1.getHeight() + yPos - 1, width, f1.getHeight() + yPos - 1);
g.drawString("MEDIUM FONT", 0, yPos, Graphics.LEFT | Graphics.TOP);
g.setColor(BLACK);
//g.drawLine(0, f2.getHeight() + yPos - 1, width, f2.getHeight() + yPos - 1);

yPos = yPos + f1.getHeight() + 10;
g.setFont(f3);
g.drawString("SMALL FONT", 0, yPos, Graphics.LEFT | Graphics.TOP);
yPos = yPos + f1.getHeight() + 10;
g.drawLine(0, f3.getHeight() + yPos - 1, width, f3.getHeight() + yPos - 1);

painting = false;
}

}
}