/* In this example we will construct a choice group using the Append()method.
We design an exclusive choice, where only one element can be chosen at a time */

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

public class ExChGr extends MIDlet implements CommandListener{

  private Display display; // a display
  private Form fmMain; // form
  private Command cmExit; // Exit command
  private Command cmView; // View the choice selected
  private ChoiceGroup cgSMS; // Choice group
  private int replyIndex; // "reply" index in the choice group
  private int choiceGroupIndex; // Index of choice group on the form


  // constructor

  public ExChGr(){
    display = Display.getDisplay(this);

    // Create an Exculsive Radio group
    cgSMS = new ChoiceGroup("SMS Options", Choice.EXCLUSIVE);

    // Append options with images associated
    cgSMS.append("Read", null);

    // make note of the inex of the "Reply" entry
    replyIndex = cgSMS.append("Reply", null);
    cgSMS.append("Forward", null);
    cgSMS.append("Delete", null);

    // Set "reply" as the defualt selected option
    cgSMS.setSelectedIndex(replyIndex, true);

    // add commands
    cmExit = new Command("Exit", Command.EXIT,  1);
    cmView = new Command("View", Command.SCREEN, 2);

    // create form, add components, listen for events
    fmMain = new Form("You have new message ...");
    choiceGroupIndex = fmMain.append(cgSMS);
    fmMain.addCommand(cmExit);
    fmMain.addCommand(cmExit);
    fmMain.addCommand(cmView);
    fmMain.setCommandListener(this);
  }

  // start App
  public void startApp(){
    display.setCurrent(fmMain);
  }
  public void pauseApp(){
    //pause app
  }

  public void destroyApp(boolean unconditional){
    // destroy App
  }

  // Command Action
  public void commandAction(Command c, Displayable s){
    if(c == cmView){

      // build a string showing which option was slected
      StringItem siMessage = new StringItem("You Selected: ", cgSMS.getString
                                            (cgSMS.getSelectedIndex()));

      // show the string siMessage
      fmMain.append(siMessage);


      // delete the choice group and view button
      fmMain.removeCommand(cmView);
      fmMain.delete(choiceGroupIndex);
    }

    else if (c == cmExit){
      destroyApp(false);
      notifyDestroyed();
    }
  }
}