// 程序名UI_Low9.java
// 測試測試絕對坐標
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class UI_Low9 extends MIDlet implements CommandListener{
  private Display  display;
  private PigCanvas canvas; //構造一個PigCanvas對象
  private Command cmdExit;
  public UI_Low9(){
    display = Display.getDisplay( this );
    canvas  = new PigCanvas( this ); //構造一個PigCanvas對象
    cmdExit = new Command("Exit",Command.SCREEN,1);
    canvas.addCommand(cmdExit);
    canvas.setCommandListener(this);
  }

  protected void startApp(){
    display.setCurrent( canvas ); //把Canvas對象設置為當前屏幕
  }
   
  protected void pauseApp(){
  }
  
  protected void destroyApp( boolean unconditional ){
  }

  public void commandAction( Command c, Displayable d ){
    if (c == cmdExit){
      exit();
    }
  }

  public void exit(){ //單獨實現一個exit()方法，目的是讓Canvas對象也能方便調用
    destroyApp(true);
    notifyDestroyed();
  }
}