pointertest.java

来自「在eclipse环境下」· Java 代码 · 共 67 行

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class PointerTest extends MIDlet {
    Display display;
    
    //画布
    PointerCanvas pc;
    
    public PointerTest() {
        super();
        //创建画布对象实例
        pc = new PointerCanvas();
    }

    protected void startApp() throws MIDletStateChangeException {
        //获得当前MIDlet的Display对象
        display = Display.getDisplay(this); 
        //设置PointerCanvas对象为当前显示对象
        display.setCurrent(pc);
    }

    protected void pauseApp() {
        // TODO Auto-generated method stub

    }

    protected void destroyApp(boolean arg0) 
        throws MIDletStateChangeException {
        // TODO Auto-generated method stub

    }
    
    /**
     * 画布实现
     */
    class PointerCanvas extends Canvas {
        protected void paint(Graphics g) {
            //在这个方法中绘制屏幕
        }
        
        /**
         * 指针按下时触发
         */
        protected void pointerPressed(int x, int y) {
            System.out.println("Pressed (x=" + x + "; y="+y+")");
        }
        
        /**
         * 指针拖动时触发
         */
        protected void pointerDragged(int x, int y) {
            System.out.println("Dragged (x=" + x + "; y="+y+")");
        }
        
        /**
         * 指针释放时触发
         */
        protected void pointerReleased(int x, int y) {
            System.out.println("Released (x=" + x + "; y="+y+")"); 
        }
    }
}