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

/**
 * @author Ernestas Kardzys
 */
public class SplashScreen extends Canvas implements Runnable {
    private Display display;
    private Displayable next;
    private long splashTime = 0;
    private Thread thread;

    public SplashScreen(Display display, Displayable next) {
        this.display = display;
        this.next = next;

        this.display.setCurrent(this);
    }

    public SplashScreen(Display display, Displayable next, long splashTime) {
        this.display = display;
        this.next = next;
        this.splashTime = splashTime;

        this.display.setCurrent(this);
    }

    protected void paint(Graphics g) {
        int width = getWidth();
        int height = getHeight();

        // Set background color
        g.setColor(0×006000);

        g.fillRect(0, 0, width, height);

        Font font = Font.getFont(Font.FACE_MONOSPACE, Font.STYLE_BOLD, Font.SIZE_LARGE);
        g.setColor(0×555555);
        g.setFont(font);

        g.drawString("Hello, World!", width/2, height/2, 0);
    }

    // Closes the screen
    private void dismiss(){
        if (isShown())
          display.setCurrent(next);
    }

    public void showSplash() {
        thread = new Thread(this);
        thread.start();
    }

    public synchronized void notifyDone() {
        notify();
    }

    public void keyReleased(int keyCode) {
        // Do something if a key was pressed or dismiss(); …
    }

    public void pointerReleased(int x, int y) {
       // … or with pointer – dismiss();
    }

    public synchronized void run() {
        try {
            // Splash time set – splash until time ends
            if (splashTime > 0) {
                Thread.sleep(splashTime);
            }
            else {
                // No time set – wait until notified
                wait();
            }

            dismiss();
        }
        catch (InterruptedException ex) {
            ex.printStackTrace();
            dismiss();
        }
    }

}

// Some code here…
splashScreen.notifyDone();

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

/**
 * @author Ernestas Kardzys
 */
public class Midlet extends MIDlet implements CommandListener {
    private Display display;
    private Form mainForm;
    private TextBox textBox;
    private Command quitCommand;
    private Command backCommand;
    private Command alertCommand;
    private Command textboxCommand;

    /**
      * Called by the system to start our MIDlet.
      */
    public void startApp() {
        display = Display.getDisplay(this);

        quitCommand = new Command("Exit", Command.EXIT, 1);
        backCommand = new Command("Back", Command.BACK, 1);
        alertCommand = new Command("Alert", Command.SCREEN, 2);
        textboxCommand = new Command("Show textbox", Command.SCREEN, 3);

        mainForm = new Form("Main form!");
        mainForm.addCommand(quitCommand);
        mainForm.addCommand(alertCommand);
        mainForm.addCommand(textboxCommand);
        mainForm.setCommandListener(this);

        textBox = new TextBox("SimpleTextBox", "", 100, 0);
        textBox.setCommandListener(this);
        textBox.addCommand(alertCommand);
        textBox.addCommand(backCommand);
        textBox.setCommandListener(this);

        display.setCurrent(mainForm);
    }

    /**
      * Called by the system to pause our MIDlet.
      */
    public void pauseApp() {
       
    }

    /**
      * Called by the system to end our MIDlet.
      */
    public void destroyApp(boolean unconditional) {

    }

    public void commandAction(Command choice, Displayable displayable) {
        if (choice == quitCommand) {
            destroyApp(false);
            notifyDestroyed();
        }
        else if (choice == backCommand) {
            display.setCurrent(mainForm);
        }
        else if (choice == textboxCommand) {
            display.setCurrent(textBox);
        }
        else if (choice == alertCommand) {
            if (textBox.getString().trim().length() > 0) {
                Alert alert = new Alert(textBox.getString());
                alert.setTimeout(5000);
                textBox.setString("");
                display.setCurrent(alert);
            }
        }
    }
}