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

public class  RecordMIDlet
    extends  MIDlet
    implements  CommandListener {
  private static final String  kUser     = "user";
  private static final String  kPassword = "password";
  
  private Preferences  mPreferences;
  private Form         mForm;
  private TextField    mUserField, mPasswordField;
  
  public  RecordMIDlet( ) {
    try {
      mPreferences = new Preferences( "preferences" );
    }
    catch ( RecordStoreException  rse ) {
      mForm = new Form( "Exception" );
      mForm.append( new StringItem( null, rse.toString( ) ) );
      mForm.addCommand( new Command( "Exit", Command.EXIT, 0 ) );
      mForm.setCommandListener( this );
      return;
    }

    mForm = new Form( "Login" );
    mUserField     = new TextField(
      "Name", mPreferences.get( kUser ), 32, 0 );
    mPasswordField = new TextField(
      "Password", mPreferences.get( kPassword ), 32, 0 );
    mForm.append( mUserField );
    mForm.append( mPasswordField );
    mForm.addCommand( new Command( "Exit", Command.EXIT, 0 ) );
    mForm.setCommandListener( this );
  }
  
  public void  startApp( ) {
    Display.getDisplay( this ).setCurrent( mForm );
  }
  
  public void  pauseApp( ) { }

  public void  destroyApp( boolean unconditional ) {
    // Save the user name and password.
    mPreferences.put( kUser, mUserField.getString( ) );
    mPreferences.put( kPassword, mPasswordField.getString( ) );
    try { 
      mPreferences.save( );
    }
    catch ( RecordStoreException  rse ) { }
  }

  public void  commandAction( Command c, Displayable s ) {
    if ( c.getCommandType( ) == Command.EXIT ) {
      destroyApp( true );
      notifyDestroyed( );
    }
  }
}