j2me 实现翻页功能的一个小例子

/*

create time: 2008-8-30 Administrator

*/

import javax.microedition.lcdui.*;

import javax.microedition.midlet.MIDlet;

import javax.microedition.midlet.MIDletStateChangeException;

public class PageMessage extends MIDlet {

public cCanvas canvas;

public PageMessage() {

canvas = new cCanvas();

}

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

Display.getDisplay(this).setCurrent(canvas);

}

}

class cCanvas extends Canvas {

public String message[][] = { { "订单号", "股票名称", "价格", "数量" },

{ "bbb", "bbb", "bbb", "bbb" }, { "ccc", "bbb", "bbb", "bbb" },

{ "ddd", "bbb", "bbb", "bbb" }, { "eee", "bbb", "bbb", "bbb" },

{ "fff", "bbb", "bbb", "bbb" }, { "ggg", "bbb", "bbb", "bbb" } };

private static int startindex, currentindex, LINENUM = 3, COLNUM = 4;

public cCanvas() {

}

protected void paint(Graphics g) {

g.setColor(255, 255, 255); //刷屏

g.fillRect(0, 0, getWidth(), getHeight());

g.setColor(0); //设置显示字体颜色

drawPageStudentMessage(g);

drawSoftKey(g); //画左右键

}

public void drawSoftKey(Graphics g) {

g.setColor(0); //设置显示字体颜色

g.drawString("返回", 2, getHeight() - 2, Graphics.LEFT | Graphics.BOTTOM);

g.drawString("下页", getWidth() - 2, getHeight() - 2, Graphics.RIGHT

| Graphics.BOTTOM);

}

//数据内容，实现翻页功能

public void drawPageStudentMessage(Graphics g) {

for (int currentindex = startindex; (currentindex < startindex

+ LINENUM)

&& currentindex < message.length; currentindex++) {

for (int col = 0; col < COLNUM; col++) {

g.drawString(message[currentindex][col], 60 * col,

20 * (currentindex % LINENUM), Graphics.LEFT

| Graphics.TOP);

}

}

}

public static int page;

protected void keyPressed(int keyCode) {

if (keyCode == -7) //点击右键 翻页

{

if (page < message.length / LINENUM)

page++;

startindex = (page * LINENUM);

}

if (keyCode == -6) //点击左键 翻页

{

if (page > 0)

page--;

startindex = (page * LINENUM);

}

repaint();

}

}