telephonelistmidlet.java

java 的手机通讯录程序

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

public class TelephoneListMIDlet extends MIDlet implements CommandListener
{
  static TelephoneListMIDlet instance;
  private Display display;
  private Form mainScreen;
  private Command exitCommand, addCommand, editCommand,
      deleteCommand, deleteStoreCommand;
  public static PersistantData pd;
  public TelephoneListMIDlet() throws IOException
  {
    this.instance = this;
    pd = new PersistantData();
    pd.openRecStore("Telephone Directory");
    exitCommand = (new Command("Exit", Command.EXIT, 0));
    addCommand = new Command("Add to Telephone List", Command.SCREEN, 0);
    editCommand = new Command("Edit Telephone List", Command.SCREEN, 1);
    deleteCommand = new Command("Delete from Telephone List", Command.SCREEN, 2);
    deleteStoreCommand = new Command("Delete record Store", Command.SCREEN, 3);
    mainScreen = new Form("FlagMidlet");
    mainScreen.append("Hit the menu button to see the choices");
    mainScreen.addCommand(exitCommand);
    mainScreen.addCommand(addCommand);
    mainScreen.addCommand(editCommand);
    mainScreen.addCommand(deleteCommand);
    mainScreen.addCommand(deleteStoreCommand);
    mainScreen.setCommandListener(this);
    display = Display.getDisplay(this);
  }

  public Form getForm()
  {
    return mainScreen;
  }

  public void commandAction(Command c, Displayable d)
  {
    if (c == exitCommand)
    {
      TelephoneListMIDlet.quitApp();
    }
    else if (c == addCommand)
    {
      display.setCurrent(new AddScreen());
    }
    else if (c == editCommand)
    {
      display.setCurrent(new EditScreen());
    }
    else if (c == deleteCommand)
    {
      display.setCurrent(new DeleteScreen());
    }
    else if (c == deleteStoreCommand)
    {
      try
      {
        PersistantData.recordStore.closeRecordStore();
        System.out.println("record store closed");
        PersistantData.recordStore.deleteRecordStore("Telephone Directory");
      }
      catch (Exception e)
      {
        e.printStackTrace();
      }
    }
  }

  public void startApp()
  {
    display.setCurrent(mainScreen);
  }

  public void pauseApp()
  {
  }

  public void destroyApp(boolean unconditional)
  {
    instance.destroyApp(true);
    instance.notifyDestroyed();
    instance = null;
    System.out.println("finished");
  }

  public static void quitApp()
  {
    instance.destroyApp(true);
    instance.notifyDestroyed();
    instance = null;
  }
}