J4ME: Issue in touch screen devices of nokia

[shanu14]

Hi,

I am working on a J4ME application for touch screen device of Nokia. But touch motion is not proper working in my application. I am writing the code in pointer dragged and pointer Released method. Kindly give me any code or any solution of this issue.

[skalogir]

Hi shanu14 and welcome to Nokia's Discussion Boards,

A sample code for what you need is this:

The CanvasKeyPressed MIDlet:

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

public class CanvasKeyPressed extends MIDlet implements CommandListener{
	CanvasKey canvas;

  private Display display;
  Command cmd2=new Command("KeyPress2",Command.OK,0);
  
  public void startApp(){
  canvas = new CanvasKey();
  display = Display.getDisplay(this);
  display.setCurrent(canvas);
  canvas.addCommand(cmd2);
  canvas.setCommandListener(this);
  }

  public void pauseApp(){}

  public void destroyApp(boolean unconditional){}

  public void commandAction(Command c, Displayable d) 
  {
	if(c==cmd2)
	{
		canvas.keyPressed(2);
	}
	
  }
  
}

The CanvasKey supporting java class:

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;


class CanvasKey extends Canvas{

  private Font font;
  private String message = "[PRESS KEY]";

  public CanvasKey(){
  font = Font.getFont(Font.FACE_PROPORTIONAL, 
   Font.STYLE_PLAIN, Font.SIZE_MEDIUM);
  }

  public void mypress(int akey)
  {
	  keyPressed(akey);
  }
  public void paint(Graphics g){
  int width = getWidth();
  int height = getHeight();

  g.setColor(255, 0, 0);
  g.fillRect(0, 0, width - 1, height - 1);
  g.setColor(0, 0, 255);
  g.drawRect(0, 0, width - 1, height - 1);
  g.setFont(font);

  int x = width / 2;
  int y = height / 2;

  g.drawString(message, x, y, Graphics.BASELINE | Graphics.HCENTER);
  }
  

  protected void keyPressed(int keyCode){
	  message="KeyCode is "+keyCode;
	  repaint();
  }
  protected void pointerPressed(int x, int y)
  {
	 message="Pressed!";
	 repaint();
  }
  protected void pointerReleased(int x, int y)
  {
	  message="Released!";
	  repaint();
  }
  
  protected void pointerDragged(int x, int y)
  {
	  message="Dragged!";
	  repaint();
  }

}

Make sure that you also check

a) the Java ME examples in the wiki:
http://www.developer.nokia.com/Commu...tegory:Java_ME

b) the Touch UI articles in Java Developer's Library:
http://library.developer.nokia.com/t...B166C077F.html

c) the examples in the Library (including the multipoint touch event examples)
http://library.developer.nokia.com/t...33A115191.html

[shanu14]

Hi skalogir,

Thanks for reply.

Actually I am working on a J4ME application for touch screen device of Nokia. But touch motion is not proper working in my application. I am writing the code in pointer dragged and pointer Released method. Kindly provide me any solution

[skalogir]

Hi shanu14,

But touch motion is not proper working in my application

Could you elaborate a bit more about the problem and the target device? It might be easier, if you could provide the code that is not working and a short description of what you need to do.

[shanu14]

Hi,

Touch motion(J4ME) is not proper working(drag up and down) in 5230 and other devices also.

[skalogir]

I assume this is the same problem as the one you have opened here:

http://www.developer.nokia.com/Commu...king-more-time

I have already provided some suggestions on the above thread.