LWUIT: Button

Example of using Button of LWUIT.

In order to handle the action trigged by a button, a class(it is "this" in this case) implements actionPerformed() have to be set as listener by the method addActionListener().

import java.io.IOException;
import javax.microedition.midlet.*;

import com.sun.lwuit.*;
import com.sun.lwuit.events.*;
import com.sun.lwuit.plaf.Border;

public class HelloMIDlet extends MIDlet implements ActionListener {

    Form f;
    Command exitCommand;
    Button buttonTextOnly, buttonImage, buttonTextAndImage;

  public void startApp() {
   Display.init(this);

   f = new Form("Hello, MIDlet in LWUIT!");

   
   
   buttonTextOnly = new Button("I'm Button");
   buttonTextOnly.getStyle().setBorder(Border.createEtchedRaised());
   buttonTextOnly.getSelectedStyle().setBgColor(0xC0C0C0);
   f.addComponent(buttonTextOnly);

   buttonImage = null;
   try {
       buttonImage = new Button(Image.createImage("/java.png"));
   }
   catch (IOException ex) {
       ex.printStackTrace();
   }
   buttonImage.getStyle().setBorder(Border.createLineBorder(5, 0xA0A0A0));
   buttonImage.getSelectedStyle().setBgColor(0xC0C0C0);
   f.addComponent(buttonImage);

   buttonTextAndImage = new Button();
   buttonTextAndImage.setText("Button with Text and Image");
   try {
       buttonTextAndImage.setIcon(Image.createImage("/java.png"));
   } catch (IOException ex) {
       ex.printStackTrace();
   }
   buttonTextAndImage.getSelectedStyle().setBgColor(0xC0C0C0);
   f.addComponent(buttonTextAndImage);

   f.show();

   exitCommand = new Command("Exit");
   f.addCommand(exitCommand);
   f.setCommandListener(this);

   buttonTextOnly.addActionListener(this);
   buttonImage.addActionListener(this);
   buttonTextAndImage.addActionListener(this);

  }

  public void pauseApp() {}

  public void destroyApp(boolean unconditional) {}

  public void actionPerformed(ActionEvent ae) {
   //notifyDestroyed();

      Command aeCommand = ae.getCommand();
      Object aeSource = ae.getSource();

      if (aeCommand == exitCommand){
          notifyDestroyed();
      }

      if(aeSource == buttonTextOnly){
          buttonTextOnly.setText("I have been Pressed");
          f.repaint();
      }
      else if(aeSource == buttonImage){
          buttonImage.setText("I have been Pressed");
          f.repaint();
      }
      else if(aeSource == buttonTextAndImage){
          buttonTextAndImage.setText("I have been Pressed");
          f.repaint();
      }
  }
}