Ticker problem

Question

Hello!
I've got a problem with the Ticker-function. I don't want my Ticker to reset (start over again) when i change between an application's Displayables. Does anybody know how to avoid this?
I supply an example where the Ticker will be reset if you select "Test-screen #1".
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class TickerTest extends MIDlet implements CommandListener{
private Display myDisplay;
private Command backCommand;
private List myMenu;
private Ticker myTicker;
public void pauseApp(){}
public void destroyApp(boolean unconditional){}
public void startApp(){
if(myDisplay==null)myDisplay=Display.getDisplay(this);
initialize();
setDisplay(myMenu);
public void commandAction(Command c, Displayable d){
if(c == List.SELECT_COMMAND){
switch(((List)d).getSelectedIndex()){
case(0):
TextBox t=new TextBox("Foo", "Bar", 100, TextField.ANY);
t.addCommand(backCommand);
t.setCommandListener(this);
setDisplay(t);
break;
}else if(c==backCommand){
setDisplay(myMenu);
public void setDisplay(Displayable d){
d.setTicker(myTicker);
myDisplay.setCurrent(d);
private void initialize(){
myTicker=new Ticker("Tick Tack - this is a nice hack");
backCommand=new Command("Back", Command.BACK, 0);
String[] menuAlt={"Test-screen #1"};
myMenu=new List("Main menu", List.IMPLICIT, menuAlt, null);
myMenu.setCommandListener(this);
TY for any help!
-J�rgen-

Answer 1

Hi!
Here is an improved version. The first time you switch Display it still reset the ticker, but after that you go back and forth it works as it should be. I am not sure why it is not working the first time another display is switched, may be a bug or may be there is some work around which I am not getting.
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class TickerTest extends MIDlet implements CommandListener{
     private Display myDisplay;
     private Command backCommand;
     private List myMenu;
     private Ticker myTicker;
     private TextBox t;
     private Form mainForm;
     private String[] menuAlt;
     public void pauseApp(){}
     public void destroyApp(boolean unconditional){}
     public void startApp(){
          if(myDisplay==null)
               myDisplay = Display.getDisplay(this);
          initialize();
          setDisplay(myMenu);
     public void commandAction(Command c, Displayable d){
          if(c == List.SELECT_COMMAND){
               switch(((List)d).getSelectedIndex()){
                    case(0):
                         setDisplay(t);
                         break;
                    case(1):
                         setDisplay(mainForm);
                         break;
          }else if(c==backCommand){
               setDisplay(myMenu);
     public void setDisplay(Displayable d){
          d.setTicker(myTicker);
          myDisplay.setCurrent(d);
     private void initialize(){
          myTicker = new Ticker("Tick Tack - this is a nice hack!");
          backCommand = new Command("Back", Command.BACK, 0);
          menuAlt = new String[]{"Test-screen #item1", "Test-screen #item2"};
          myMenu = new List("Main menu", List.IMPLICIT, menuAlt, null);
          myMenu.setCommandListener(this);
          t = new TextBox("Foo", "Bar", 100, TextField.ANY);
          t.addCommand(backCommand);
          t.setCommandListener(this);
          mainForm = new Form("Ticker");
          mainForm.addCommand(backCommand);
          mainForm.setCommandListener(this);
}