图像未在iPhone中加载

Question

I have created own listmodel and override its methods and image is displaying in android but in iphone it displays image first time and when back and return to the page then it dispays only white screen , how to solve it?

@Override
public Image getItemAt(final int index) {
    if (images[index] == null) {
        String imageName = "image_" + urls.get(index).hashCode();
        if (Storage.getInstance().exists(imageName)) {
            InputStream is;
            try {

                is = Storage.getInstance().createInputStream(imageName);
                EncodedImage i = EncodedImage.create(is, is.available());
                images[index] = i;
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        } else {
            images[index] = defaultImage;
            Util.downloadUrlToStorageInBackground(urls.get(index), imageName, (e) -> {
                try {
                    images[index] = EncodedImage.create(Storage.getInstance().createInputStream(imageName));
                    listeners.fireDataChangeEvent(index, DataChangedListener.CHANGED);
                } catch (IOException err) {
                    err.printStackTrace();
                }
            });
        }

    }

    return images[index];
}

Answer 1

You seem to return null for missing images which might be a problem. You need to return placeholder values and replace them later.