Experiment 5 - Displaying Multiple Screens with High-level UI

Navigating through Multiple Screens in a MIDlet

(Experiment 5)

Version 1:

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

public class SlideShowText extends MIDlet implements CommandListener

{

private Display display;

private Command back;

private Command exit;

private Command nxtBtn;

private Command cmdDisp;

private Form form;

private TextBox txtSlide;

private Form frm;

private TextField txtHello;

private StringItem st = new StringItem("","");

public SlideShowText()

{

display = Display.getDisplay(this);

exit = new Command("Exit", Command.EXIT, 1);

nxtBtn = new Command(">>", Command.OK, 2);

back = new Command("<<", Command.BACK, 3);

cmdDisp = new Command("Display",Command.OK,4);

/* Code for Creating Screen1 */

form = new Form("Slide Show MIDlet - Home");

String msg = "Hello World!!!!!!!";

form.append(msg);

form.addCommand(exit);

form.addCommand(nxtBtn);

form.setCommandListener(this);

/* Code for Creating Screen2 */

txtSlide = new TextBox("Second Screen of Slide Show", "Press Prev Button to go back to Home screen & Next Button to go to Third Screen.", 81, 0);

txtSlide.addCommand(back);

txtSlide.addCommand(nxtBtn);

txtSlide.setCommandListener(this);

/* Code for Creating Screen3 */

frm = new Form("Third Screen of Slide Show");

txtHello = new TextField("Welcome Text", msg, 50, 0);

frm.append(txtHello);

frm.addCommand(back);

frm.addCommand(cmdDisp);

frm.addCommand(exit);

frm.setCommandListener(this);

}

public void startApp()

{

display.setCurrent(form);

}

public void pauseApp()

{ }

public void destroyApp(boolean unconditional)

{ }

public void commandAction(Command command, Displayable displayable)

{

if (command == back)

{

if (displayable == frm)

{

display.setCurrent(txtSlide);

}

else

{

display.setCurrent(form);;

}

else if (command == exit)

{

destroyApp(false);

notifyDestroyed();

}

else if (command == nxtBtn)

{

if (displayable == form)

{

display.setCurrent(txtSlide);

}

else if (displayable == txtSlide)

{

display.setCurrent(frm);

}

else if (command == cmdDisp)

{

st.setText("");

st.setText(txtHello.getString());

frm.append(st);

}

Output:

Version 2 (Displaying One after the Other like Slideshow):

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class SlideShow extends MIDlet implements CommandListener {
public Form slide1;
public Form slide2;
public Form slide3;
public Command Exit;
public Display display;
public SlideShow()
{
display=Display.getDisplay(this);
Exit=new Command("Exit",Command.EXIT,1);
slide1=new Form("Slide1");
slide1.append("This is Slide number 1");
slide1.addCommand(Exit);
slide2=new Form("Slide2");
slide2.append("This is Slide number 2");
slide2.addCommand(Exit);
slide3=new Form("Slide3");
slide3.append("This is Slide number 3");
slide3.addCommand(Exit);
slide1.setCommandListener(this);
slide2.setCommandListener(this);
slide3.setCommandListener(this);
}
public void startApp() {
Thread runner = new Thread(new ThreadRunner(display,slide1,slide2,slide3));
runner.start();
}
public void pauseApp()
{
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command command,Displayable displayable)
{
if(displayable==slide1)
{
if(command==Exit) notifyDestroyed();
}
else if(displayable==slide2)
{
if(command==Exit) notifyDestroyed();
}
else if(displayable==slide3)
{
if(command==Exit) notifyDestroyed();
}
}
}
class ThreadRunner implements Runnable
{
Display display;
public int c=0;
public Form slide1;
public Form slide2;
public Form slide3;
public ThreadRunner(Display display,Form slide1,Form slide2,Form slide3)
{
this.display = display;
this.slide1=slide1;
this.slide2=slide2;
this.slide3=slide3;
}
public void run()
{
while(true)
{
c++;
if(c==1)
display.setCurrent(slide1);
else if(c==2)
display.setCurrent(slide2);
else if(c==3)
display.setCurrent(slide3);
else if(c==4)
c=0;
try
{
Thread.sleep(1500);
}
catch(Exception ex)
{ }
}
}
}