The image appears only in running my application on device

Hello

use listfield where images are drawn.

the images are downloaded from a url using Analyzer, these images are

populated my listfield.

It works fine when running my apps on my Simulator

But doesn't work in the unit.

WATS the problem?

class Download extends Thread {
        private Vector urls;

        public Download(Vector urls) {
            this.urls = urls;

        }

        public void run() {
            try {
                System.out.println("starting downloading");
                for (int i = 0; i < urls.size(); i++) {

                    System.out.println("a part ofconstant url which is common " +i
                            + urls.elementAt(i));

                    imageData = getImage((String) urls.elementAt(i));

                    EncodedImage img = EncodedImage.createEncodedImage(
                            imageData, 0, imageData.length);
                    imageListElements.addElement(img);
                    System.out.println("image added");
                }
                System.out.println("\t\t Download completed");

                UiApplication.getUiApplication().invokeLater(new Runnable() {
                    public void run() {
                        System.out.println("Pushing the list screen");
                        AscreenListFieldCallBack callBack = new AscreenListFieldCallBack (imageListElements);
                        _list.setCallback(callBack);
                        System.out.println("imageListElements.size() --> " + imageListElements.size());
                        for (int i = 0; i < imageListElements.size(); i++) {
                            _list.insert(i);
                            callBack.insert("imageListElements", i);
                        }
                        add(_list);
                        invalidate();
                    }
                });

            } catch (Exception e) {
                System.err.println("Msg: " + e.toString());
            }
        }

        public void startThread() {
            new Thread(this).start();
        }

        public byte[] getImage(String url) throws IOException {
            HttpConnection connection = (HttpConnection) Connector.open(url + ";deviceside=true");
            DataInputStream iStrm = connection.openDataInputStream();
            ByteArrayOutputStream bStrm = null;
            byte imageData[];
            int length = (int) connection.getLength();
            System.out.println("length --> " + length);
            if (length != -1) {
                imageData = new byte[length];
                iStrm.readFully(imageData);
            } else {
                bStrm = new ByteArrayOutputStream();
                int ch;
                while ((ch = iStrm.read()) != -1)
                    bStrm.write(ch);
                imageData = bStrm.toByteArray();
                bStrm.close();
            }
            System.out.println("\n\n\n\n image Data  " + imageData);
            return imageData;
        }
    }

}

Once you start a download must be completed or throws an Exception. I've never seen a communication process so nothing else.

But you say:

"in the console, it displays as started, but it is not downloaded.

I suspect that your treatment is throw an exception. Have you checked this while debugging?

To answer your question later, yes there are limits of size of the files that can be downloaded. The limit depends on the circumstances, but can be as low as 128 KB. Of course, a picture of 128 KB is big enough, probably too large to display in a ListField.

I think it should be clear that it is much more effective to send a picture about the right size for the BlackBerry. That way you'll spend less time of transmission and, if you want to scale on the BlackBerry, the scale is much faster.

Tags: BlackBerry Developers

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