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在J2Se應用程序上創建javax.microedition.lcdui.Image

[英]Creating a javax.microedition.lcdui.Image on J2Se Application

我已經為J2Me設計了一個組件,這是paint方法:

import javax.microedition.lcdui.Graphics;  
import javax.microedition.lcdui.Image;  
class Component {
...
public void paint(Graphics g) {
    if (background != null)
        g.drawImage(image, bounds.getLocation().x, bounds.getLocation().y, 0);
}
...
}

我想在J2Se應用程序上繪制此組件,我嘗試將組件繪制到J2Me圖像上,然后將int []提取到InputStream中,並使用此對象在J2Se平台上創建一個新圖像:

public class ComponentStreamer {
    private Component component;
    private Image j2Me_Image;

    public void setComponent(Component component) {
        this.component = component;
    }

    public InputStream getInputStream() throws IOException {
        if(component==null)
            return null;
        //THIS LINE THROWS THE EXCEPTION
        j2Me_Image=Image.createImage(component.getSize().width, component.getSize().height); 
        component.paint(j2Me_Image.getGraphics());
            return getImageInputStream(j2Me_Image);
    }
}

我已經嘗試了對象,但是注釋行引發了異常:

Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: javax.microedition.lcdui.ImmutableImage.decodeImage([BII)V
    at javax.microedition.lcdui.ImmutableImage.decodeImage(Native Method)
    at javax.microedition.lcdui.ImmutableImage.getImageFromStream(Image.java:999)
    at javax.microedition.lcdui.ImmutableImage.<init>(Image.java:955)
    at javax.microedition.lcdui.Image.createImage(Image.java:554)

如何克服這個錯誤?

謝謝,
亞當。

好,

深入研究J2Me MIDP和CLDC的源代碼以及使用名為Microemulator的軟件包的過程是一個漫長的過程,下面的代碼可以使其他人入門:

這將啟動一個模擬器,然后啟用一些J2Me功能。

    private void setUpEmulator() {
    try {
        // overrideJ2MeImagePackageLock();
        Headless app = new Headless();
        DeviceEntry defaultDevice = new DeviceEntry("Default device", null, DeviceImpl.DEFAULT_LOCATION, true, false);
        Field field = app.getClass().getDeclaredField("emulator");
        field.setAccessible(true);
        Common emulator = (Common) field.get(app);
        emulator.initParams(new ArrayList<String>(), defaultDevice, J2SEDevice.class);
    } catch (Exception e) {
        e.printStackTrace();
        System.out.println("Un-handled Exception");
    }
}

接下來,我們還有其他一些不錯的對象可以使用:

    public class J2MeImageLayer extends ScalableLayer {
    private static final long serialVersionUID = -4606125807092612043L;

    public J2MeImageLayer() {
        componentViewer.super();
    }
    @Override
    public void repaint() {
        J2SEMutableImage mutableImage = new J2SEMutableImage(page.getSize().width, page.getSize().height);
        page.paint(mutableImage.getGraphics());
        Graphics g = getImage().getGraphics();
        g.drawImage(mutableImage.getImage(), 0, 0, DCP_Simulator.this);
    }
    public void addComponent(Component component) {
        page.add(component);
    }
    public void setComponent(final Component component) {
        page.removeAllElements();
        final Container componentParent;
        if ((componentParent = component.getParent()) != null)
            component.setRemovedAction(new interfaces.Action() {
                @Override
                public void action() {
                    componentParent.add(component);
                }
            });
        page.add(component);
    }
}

這是如何做到這一點的重點。

亞當。

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