J2ME Tutor

Custom Font in J2ME

2009-05-02T20:47:00.000-07:00

Drawing strings in low level J2ME Application/Game is somewhat complicated. Though there is a easiest way to do that. That is called Custom Font.

Using this methodology you include any kind of PC Fonts in your application.

Steps to be followed:-

1. Create a Bitmap font Image based on your Charset. Your Charset may be in any Language.
Example:-

"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_/?"

2. Get each Character X_Offset & Width values & make an integer array.
Example:-

public int CHAR_X[] = {
0,7,13,19,26,33,39,45,53,57,61,69,72,82,89,96,103,110,115,122,127,134,140,149,156,162, 168,177,183,191,200,206,213,222,231,235,242,248,255,265,273,282,289,298,306,312,321,328,336,348,355,362,
368,376,383,391,396,405,412,418,426,432,
440,444,454,462,468,477,483,491,498,503,507,515,522
} ;

public int CHAR_W[] = {
5,5,6,6,6,4,6,6,2,2,6,2,9,6,6,6,6,4,5,4,5,5,9,6,6,6,
8,5,7,7,4,5,8,8,2,5,6,5,10,7,8,6,8,8,6,8,7,8,12,8,7,6,
7,5,7,5,7,6,5,7,5,6,2,
10,7,5,8,6,8,6,3,3,7,4,4
} ;

3. Integrate the above steps in the source code.

/////////////////////////////////////////////////////////////////////
Example Canvas class
/////////////////////////////////////////////////////////////////////
public class FontCanvas extends Canvas{

private int mWidth;
private int mHeight;
private Font mFont;

/** Creates a new instance of FontCanvas */
public FontCanvas() {
this.setFullScreenMode(true);
mFont = new Font();
this.mWidth = getWidth();
this.mHeight = getHeight();
}

protected void paint(Graphics g) {
g.setColor(0xffffff);
g.fillRect(0, 0, mWidth, mHeight);

//mFont.drawString(g, "Have a look at this Custom Font", 10, 10, 0);

mFont.setColor(0xFF0000);
mFont.drawString(g, "abcdefghijklmnopqrstuvwxyz", 10, 10, 0);
mFont.drawString(g, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 10, 30, 0);
mFont.drawString(g, "0123456789!@#$%^&*()_/?", 10, 50, 0);

mFont.setColor(0x00AA00);
mFont.drawString(g, "abcdefghijklmnopqrstuvwxyz", 10, 80, 0);
mFont.drawString(g, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 10, 100, 0);
mFont.drawString(g, "0123456789!@#$%^&*()_/?", 10, 120, 0);

mFont.setColor(0x0000FF);
mFont.drawString(g, "abcdefghijklmnopqrstuvwxyz", 10, 150, 0);
mFont.drawString(g, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 10, 170, 0);
mFont.drawString(g, "0123456789!@#$%^&*()_/?", 10, 190, 0);

mFont.setColor(0x0);
mFont.drawString(g, "abcdefghijklmnopqrstuvwxyz", 10, 230, 0);
mFont.drawString(g, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 10, 250, 0);
mFont.drawString(g, "0123456789!@#$%^&*()_/?", 10, 270, 0);

mFont.setColor(0xFF00FF);
mFont.drawString(g, "by Albert", mWidth-70, mHeight-14, 0);
}
}

/////////////////////////////////////////////////////////////////////
Example Font Class:-
/////////////////////////////////////////////////////////////////////
class Font
{
Image fontImage, forColorImage;
int fontHeight;

public Font()
{
try{
fontImage = Image.createImage("/font.png");
forColorImage = fontImage;
fontHeight = fontImage.getHeight();
}catch(Exception e){}
}

public String CHAR_SET = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_/?";

public int CHAR_X[] = {
0,7,13,19,26,33,39,45,53,57,61,69,72,82,89,96,103,110,115,122,127,134,140,149,156,162,
168,177,183,191,200,206,213,222,231,235,242,248,255,265,273,282,289,298,306,312,321,328,336,348,355,362,
368,376,383,391,396,405,412,418,426,432,440,444,454,462,468,477,483,
491,498,503,507,515,522
} ;

public int CHAR_W[] = {
5,5,6,6,6,4,6,6,2,2,6,2,9,6,6,6,6,4,5,4,5,5,9,6,6,6,
8,5,7,7,4,5,8,8,2,5,6,5,10,7,8,6,8,8,6,8,7,8,12,8,7,6,
7,5,7,5,7,6,5,7,5,6,2,
10,7,5,8,6,8,6,3,3,7,4,4
} ;

public int convert_RGB_to_ARGB(int rgb) {
int r = (rgb >> 16) & 0xFF;
int g = (rgb >> 8) & 0xFF;
int b = (rgb >> 0) & 0xFF;
return 0xff000000 | (r <<>
}

public void setColor(int c)
{
int w = fontImage.getWidth();
int h = fontImage.getHeight();
int len = w*h;
int temp[] = new int[len];
forColorImage.getRGB(temp, 0, w, 0, 0, w, h);
int color = convert_RGB_to_ARGB(c);
//System.out.println("COLOR: " + Integer.toHexString(color));
for(int i=0; i
if(temp[i] == -16711936)
temp[i] = color;
this.fontImage = fontImage.createRGBImage(temp, w, h, false);
temp=null;
}

public void drawString(Graphics g, String str, int x, int y, int anchor)
{
int cx = g.getClipX();
int cy = g.getClipY();
int cw = g.getClipWidth();
int ch = g.getClipHeight();

char chr[] = str.toCharArray();
int len = chr.length;
int c;
for(int i=0; i
{
if(chr[i] != ' ')
{
c = CHAR_SET.indexOf(""+chr[i]);
//System.out.println(i+":"+c + "fontHeight: " + fontHeight);

g.clipRect(x, y, CHAR_W[c], 14);
g.drawImage(fontImage, x-CHAR_X[c], y, Graphics.TOP | Graphics.LEFT);
g.setClip(cx, cy, cw, ch);

x += CHAR_W[c]+1;
}
else
x += 3;
}
g.setClip(cx, cy, cw, ch);
}
}

/////////////////////////////////////////////////////////////////////
Example Screen Shot
/////////////////////////////////////////////////////////////////////

J2ME Packages

2009-04-30T10:24:00.000-07:00

J2ME Configurations

JSR Specification	Acronym	Description
JSR 30	CLDC 1.0	Connected, Limited Device Configuration
JSR 139	CLDC 1.1	Connected, Limited Device Configuration 1.1
JSR 36	CDC	Connected Device Configuration
JSR 218	CDC 1.1	Connected Device Configuration 1.1

J2ME Profiles

JSR Specification	Acronym	Description
JSR 37	MIDP 1.0	Mobile Information Device Profile
JSR 118	MIDP 2.0	Mobile Information Device Profile 2.0
JSR 75	PDAP	PDA Profile
JSR 46	FP	Foundation Profile
JSR 219	FP 1.1	Foundation Profile 1.1
JSR 129	PBP	Personal Basis Profile
JSR 217	PBP 1.1	Personal Basis Profile 1.1
JSR 62	PP	Personal Profile
JSR 215	PP 1.1	Personal Profile 1.1
JSR 195	IMP	Information Module Profile
JSR 228	IMP-NG	Information Module Profile - Next Generation

J2ME Optional Packages

JSR Specification	Acronym	Description
JSR 75	PIM	PDA Optional Packages for the J2ME Platform(It supports File Connection & PIM-Personal Information Management.)
JSR 82	BTAPI	Java APIs for Bluetooth(It supports Bluetooth & Obex)
JSR 120	WMA	Wireless Messaging API(It supports Text & Binary message)
JSR 205	WMA 2.0	Wireless Messaging API 2.0(It also supports Multimedia message)
JSR 135	MMAPI	Mobile Media API(It supports Audio, Video, Volume control)
JSR 164		JAIN SIMPLE Presence
JSR 165		JAIN SIMPLE Instant Messaging
JSR 172		J2ME Web Services
JSR 177	SATSA	Security and Trust Services API for J2ME
JSR 179		Location API for J2ME
JSR 180	SIP	SIP API for J2ME
JSR 184	3D	Mobile 3D Graphics API for J2ME
JSR 186		JAIN Presence
JSR 187		JAIN Instant Messaging
JSR 190		Event Tracking API for J2ME
JSR 209		Advanced Graphics and User Interface Optional Package for J2ME Platform
JSR 211	CHAPI	Content Handling API
JSR 213		Micro WSCI Framework for J2ME
JSR 214		Micro BPSS for J2ME Devices
JSR 226		Scalable 2D Vector Graphics API
JSR 229		Payment API
JSR 230		Data Sync API
JSR 232		Mobile Operational Management
JSR 234	AMMS	Advanced Multimedia Supplements
JSR 238		Mobile Internationalization API
JSR 239		Java Bindings for OpenGL ES
JSR 246		Device Management API
JSR 253	MTA	Mobile Telephony API

RGB and ARGB in J2ME

2009-04-30T10:03:00.000-07:00

RGB - It is a color combination value of Red Green Blue

Syntax: 0xRRGGBB

Example: -

0xFF0000 (or) 255, 0, 0 (Red color)

0x00FF00 (or) 0, 255, 0 (Green color)

0x0000FF (or) 0, 0, 255 (Blue color)

Red - the red component of the color being set in range 0-255

Green - the green component of the color being set in range 0-255

Blue - the blue component of the color being set in range 0-255

ARGB - It is a color combination value of Red Green Blue with Alpha channel

Syntax: 0xAARRGGBB

Example: -

0xFFFF0000 - Red color with white color background

0x00FF0000 - Red color with transparent background

Alpha – it specifies the opacity (transparency) of the pixel

[0x00 – Fully transparent and 0xFF – white background]

Red - the red component of the color being set in range 0-255

Green - the green component of the color being set in range 0-255

Blue - the blue component of the color being set in range 0-255

Convert RGB to ARGB

public int convert_RGB_to_ARGB(int rgb) {

int r = (rgb >> 16) & 0xFF;

int g = (rgb >> 8) & 0xFF;

int b = (rgb >> 0) & 0xFF;

return 0xff000000 | (r <<>

}

Convert ARGB to RGB

public int convert_ARGB_to_RGB(int argb) {

int a = (argb >> 24) & 0xFF;

int r = (argb >> 16) & 0xFF;

int g = (argb >> 8) & 0xFF;

int b = (argb >> 0) & 0xFF;

return (r <<>

}

J2ME – Intro

2009-04-29T19:32:00.000-07:00

J2ME – Intro
J2ME/Java ME [Java (2) Micro Edition] is an advanced Java technology, developed by Sun micro systems with the help of Java Community Process Program (JCP).

JavaME is a reduced version of the Java API and Java Virtual Machine that is designed to operate within the limited resources available in the embedded computers and microcomputers. this JVM will be called as KVM [KVM- KJava (Kilobytes) Virtual Machine]

This technology is not only present in Mobile Phones but also in Pagers, PDAs & other consumer electronics devices like washing machine, Set top boxes, Car Navigation systems etc.,

J2ME is compatibility with all Java-enabled devices (Mostly in GSM phones). Blackberry, Motorola, Nokia, Samsung, LG, Sagem, SonyEricsson, Panasonic, HTC, Alcatel, Sharp, Siemens, BenQ- Siemens, NEC & etc.