keyPress事件中的keyCode和action 两个参数（附测试按键的一个小demo）

protected void keyPressed(int keyCode) ---------摘自j2me的API文档

有时候为了方便处理我们会传递
 
  两个参数用于处理按键事件.

if(action == Canvas.LEFT){
	System.out.println("LEFT is pressed");
}

else if(keys == Canvas.KEY_STAR){
	System.out.println("KEY_STAR is pressed");
}
else if(action == Canvas.RIGHT) {
	System.out.println("RIGHT is pressed");
}
 

当代码在运行的时候可能会出现多个条件都满足的情况。

moto手机：*键 为42 经过this.getGameAction(keyCode)装换后 刚好和左键相等。这样第二个分支永远执行不到。也在想这个东西怎么设计了可移植性更好

大家有什么意见了

写了一个用于测试的小的demo  作用：装在真机上显示按键的 key action 和keyName 的值
Main函数入口
import javax.microedition.lcdui.Display;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;


public class Main extends MIDlet {
	
	Display dis;
	public Main() {
		// TODO Auto-generated constructor stub
		dis = Display.getDisplay(this);
	}

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

	}

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

	}

	protected void startApp() throws MIDletStateChangeException {
		// TODO Auto-generated method stub
		dis.setCurrent(new MyCanvas());

	}

}
 
canvas画布：
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;


public class MyCanvas extends Canvas {
	
	private int keyCode;
	private String keyName;
	private int action;
	MyCanvas(){

	}
	
	protected void paint(Graphics g) {
		// TODO Auto-generated method stub
		
		/** 清屏**/
		int oldC = g.getColor();
		g.setColor(0xffffff);
		g.fillRect(0, 0, this.getWidth(), this.getHeight());
		g.setColor(oldC);
		
		g.drawString("you press:  "+ keyCode,0, 0, Graphics.TOP|Graphics.LEFT);
		g.drawString("name   is:  "+ keyName,0, 30, Graphics.TOP|Graphics.LEFT);
		g.drawString("action   is:  "+ action,0, 60, Graphics.TOP|Graphics.LEFT);
	}
	
	protected void keyPressed(int keyCode){
		
		this.keyCode = keyCode;
		keyName = this.getKeyName(keyCode);
		action = this.getGameAction(keyCode);
		this.repaint();
	}

}