keytest.java

在eclipse环境下

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 KeyTest extends MIDlet {
   Display display;
    
    //画布
    KeyCanvas kc;
    
    public KeyTest() {
        super();
        //创建画布对象实例
        kc = new KeyCanvas();
        if (!kc.hasRepeatEvents()) {
            System.out.println("Do not support keyRepeated event");
        }
    }

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

    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 KeyCanvas extends Canvas {
        protected void paint(Graphics g) {
            //在这个方法中绘制屏幕
        }
        
        /**
         * 键按下时触发
         */
        protected void keyPressed(int keyCode) {
            System.out.println("Pressed (keyCode=" + keyCode);
            System.out.println("--------keyName=" + 
                    getKeyName(keyCode));   
            System.out.println("--------Game Action=" + 
                    getGameAction(keyCode) +")"); 
        }
        
        /**
         * 长按某个键时触发
         */
        protected void keyRepeated(int keyCode) {
            System.out.println("Repeated (keyCode=" + keyCode + 
                    ", keyName=" + getKeyName(keyCode) +")");            
        }
        
        /**
         * 键释放时触发
         */
        protected void keyReleased(int keyCode) {
            System.out.println("Released (keyCode=" + keyCode + 
                    ", keyName=" + getKeyName(keyCode) +")");          
        }
    }
}