listscreen.java

Mobile Phone JSR 177 midlet example

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package satsa;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;

// Main UI screen showing the list of available messages
class ListScreen
  extends List
  implements CommandListener
{
  private final SATSAMIDlet midlet;
  private final Command commandExit =
    new Command("Exit", Command.EXIT, 1);
  private final Command commandShow =
    new Command("Show", Command.ITEM, 1);
  private final Command commandNew =
    new Command("Create new", Command.ITEM, 2);
  private final Command commandDelete =
    new Command("Delete this", Command.ITEM, 3);

  ListScreen(SATSAMIDlet midlet)
  {
    super("Messages", List.IMPLICIT);
    this.midlet = midlet;
    createList();
  }
  
  public void commandAction(Command c, Displayable d)
  {
    if (c==commandExit)
    {
      midlet.exitMIDlet();
    }
    if (c==commandShow)
    {
      midlet.showEncryptedMessage(getSelectedIndex());
    }
    if (c==commandDelete)
    {
      midlet.deleteMessage(getSelectedIndex());
    }
    if (c==commandNew)
    {
      midlet.showNewMessage();
    }
  }

  void setNumber(int number)
  {
    deleteAll();
    for(int i=1; i<=number; i++)
    {
      append("Message "+i, null);
    }
  }

  private void createList()
  {
    addCommand(commandExit);
    addCommand(commandDelete);
    addCommand(commandNew);
    addCommand(commandShow);
    setCommandListener(this);
  }
}