Question

关于J2ME显示图片的问题！急啊！

我之前有C++基础，现在刚开始学J2ME。写了一个小程序，显示一个png格式的图片，遇到了一点问题！代码如下：

import java.io.IOException;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

public class TestImage extends Canvas {

Image img;

public TestImage() throws IOException {
try
{
img = Image.createImage("/res/plane.PNG");
}
catch (IOException e)
{
System.out.println("读取图片异常！"+e.getMessage());
}
}

protected void paint(Graphics g) {

try
{
g.drawImage(img, 50, 50, Graphics.LEFT);
}
catch (Exception e)
{
System.out.println("绘制图片异常！"+e.getMessage());
}
}
}

import java.io.IOException;
import javax.microedition.lcdui.Display;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class TestImageMain extends MIDlet {

TestImage ti = new TestImage();

public TestImageMain() throws IOException {
Display.getDisplay(this).setCurrent(ti);
}

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

}

}

已经在res文件夹里面导入了plane.png这个图片，项目根目录里面也有plane.png，可是不知道为什么运行后控制台还是出错：
Running with storage root C:\Documents and Settings\Administrator\j2mewtk\2.5.2\appdb\MediaControlSkin
Running with locale: Chinese_People's Republic of China.936
Running in the identified_third_party security domain
读取图片异常！null
绘制图片异常！
Execution completed.
3403941 bytecodes executed
141 thread switches
1668 classes in the system (including system classes)
17799 dynamic objects allocated (532080 bytes)
2 garbage collections (458244 bytes collected)

我把img = Image.createImage("/res/plane.PNG");这一句改成
img = Image.createImage("/plane.PNG");之后，错误信息变成了：

Running with storage root C:\Documents and Settings\Administrator\j2mewtk\2.5.2\appdb\MediaControlSkin
Running with locale: Chinese_People's Republic of China.936
Running in the identified_third_party security domain
绘制图片异常！
Execution completed.
3404368 bytecodes executed
213 thread switches
1668 classes in the system (including system classes)
17786 dynamic objects allocated (538996 bytes)
2 garbage collections (458244 bytes collected)

请各位大神帮帮忙，小弟新手，感激不尽！

Answer 1

1. 写图片位置的时候，默认的就是res，所以不能再加res/ 了
2. g.drawImage(img, 50, 50, Graphics.LEFT);
这句不对，括号里的第4个参数是锚点，需要由 上下 和 左右 2部分构成， 写成0的话就是默认左上，换算下来就是 Graphics.LEFT|Graphics.TOP，就是需要2个方向，中间加上“|”的格式，来确认锚点位置，你只写了一个方向，就会出错。

追问

恩，试试。谢谢