ui_low9.java

java手机/PDA程序开发与设计用户界面UI_Low9.rar

// 程序名UI_Low9.java
// 测试测试绝对坐标
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class UI_Low9 extends MIDlet implements CommandListener{
  private Display  display;
  private PigCanvas canvas; //构造一个PigCanvas对象
  private Command cmdExit;
  public UI_Low9(){
    display = Display.getDisplay( this );
    canvas  = new PigCanvas( this ); //构造一个PigCanvas对象
    cmdExit = new Command("Exit",Command.SCREEN,1);
    canvas.addCommand(cmdExit);
    canvas.setCommandListener(this);
  }

  protected void startApp(){
    display.setCurrent( canvas ); //把Canvas对象设置为当前屏幕
  }
   
  protected void pauseApp(){
  }
  
  protected void destroyApp( boolean unconditional ){
  }

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

  public void exit(){ //单独实现一个exit()方法，目的是让Canvas对象也能方便调用
    destroyApp(true);
    notifyDestroyed();
  }
}