Go语言视频零基础入门到精通

javalearner

函数
protected void keyPressed(int keyCode) {
}
让我们能够使用手机数字键,下面是我编写的一个实例，由两个文件组成：

//liuy002.java
package example.liuy.liuy002;

import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class liuy002 extends MIDlet {

/**
* @see MIDlet#startApp()
*/
protected void startApp() throws MIDletStateChangeException {
Display d = Display.getDisplay(this);
keytest f = new keytest();
d.setCurrent(f);
}

/**
* @see MIDlet#pauseApp()
*/
protected void pauseApp() {
}

/**
* @see MIDlet#destroyApp(boolean)
*/
protected void destroyApp(boolean flag) throws MIDletStateChangeException {
}
}

//keytest.java
package example.liuy.liuy002;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;

public class keytest extends Canvas {

/**
* Constructor for keytest
*/
String aMessage = "[请按键]";


protected keytest() {
super();
}

/**
* @see Canvas#paint(Graphics)
*/
protected void paint(Graphics g) {
                // Clear the display
                  g.setColor(255,255,255);
                  g.fillRect(0, 0, getWidth(), getHeight());
                  g.setColor(0,0,0);
    g.drawString(aMessage,10,50,Graphics.TOP|Graphics.LEFT);
}

protected void keyPressed(int keyCode) {
aMessage = getKeyName(keyCode);
aMessage = "数字"+aMessage+"已被按下";
repaint();

}

}    
  
   
   

     
   

     
   
  
  

源码下载：http://203.93.208.26/kj/cwb/dir7/liuy002.zip