Problem with repaint of display after a click event

Question

Hi,
I have a problem with repaint of display. In particular in method keyPressed() i inserted a statement that, after i clicked bottom 2 of phone, must draw a string. But this string doesn't drawing.
Instead if i reduce to icon the window, which emulate my application, and then i enlarge it, i see display repainted with the string.
I don't know why.
Any suggestions?
Please help me.

Answer 1

modified your code little
don't draw in keyPressed
import java.io.IOException;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
public class PlayerCanvas extends Canvas implements CommandListener{
     Display display;
     Displayable dsp11;
private Image play, pause, stop, next, previous = null;
private int gamcode;
private Command quitCmd = new Command("Back", Command.ITEM, 1);
public PlayerCanvas(Display display,Displayable dsp11){
     this.display =display;
     this.dsp11 =dsp11;
     addCommand(quitCmd);
     createController();
     setCommandListener(this);
     display.setCurrent(this);
          protected void paint(Graphics g)
          g.setColor(255,200,150);
          g.fillRect(0, 0, getWidth(), getHeight());
          if (play != null){
          g.drawImage(play, getWidth()/5, getHeight()-50, Graphics.BOTTOM | Graphics.HCENTER);
          if (stop != null){
          g.drawImage(stop, getWidth()/5, getHeight()-10, Graphics.BOTTOM | Graphics.HCENTER);
          if (next != null){
          g.drawImage(next, (getWidth()/5)+10, getHeight()-30, Graphics.BOTTOM | Graphics.LEFT);
          if (previous != null){
          g.drawImage(previous, (getWidth()/5)-30, getHeight()-30, Graphics.BOTTOM | Graphics.LEFT);
               /////this will draw on key UP
               g.setColor(0,0,0);
               System.out.print(gamcode);
               if(gamcode==Canvas.UP){
                    g.drawString("PROVA",10, 0, 0);
               }else if(gamcode==Canvas.DOWN){
                    g.drawString("DIFFERENT",10, 30, 0);     
private void createController()
try {
play = Image.createImage("/icon3.png");//replace your original images plz
pause = Image.createImage("/icon3.png");
stop = Image.createImage("/icon3.png");
next = Image.createImage("/icon3.png");
previous = Image.createImage("/icon3.png");
} catch (IOException e) {
play = null;
pause = null;
stop = null;
next = null;
previous = null;
if (play == null){
System.out.println("cannot load play.png");
if (pause == null){
System.out.println("cannot load pause.png");
if (stop == null){
System.out.println("cannot load stop.png");
if (next == null){
System.out.println("cannot load next.png");
if (previous == null){
System.out.println("cannot load previous.png");
          protected void keyPressed(int keyCode)
               repaint();
               if ( (keyCode == 2) || (UP == getGameAction(keyCode)) ){
                    gamcode = UP;
                    repaint();
                    else if ( (keyCode == 8) || (DOWN == getGameAction(keyCode)) ){
                         gamcode =DOWN;
                         repaint();
          else if ( (keyCode == 4) || (LEFT == getGameAction(keyCode)) ){
          else if ( (keyCode == 6) || (RIGHT == getGameAction(keyCode)) ){
          public void commandAction(Command arg0, Displayable arg1) {
               // TODO Auto-generated method stub
               if(arg0==quitCmd){
                    display.setCurrent(dsp11);
}