通用图像加载器和BitmapDrawable

Question

We have an image in B64, an we want to use that image as loading image in Universal Image Loader while a better image isn't loaded from an url. So we create a bitmap from that url in b64 and convert it into a BitmapDrawable. The result is shown fine if I do:

imageView.setImageDrawable(bitmapDrawable)

But, on DisplayImageOptions, if I set that bitmapDrawable as image on loading, the image is never shown. I'm doing the following:

final DisplayImageOptions imageOptions = mDisplayImageOptionsDefaultBuilder.
        .showImageOnLoading(bitmapDrawable)
        .showImageOnFail(bitmapDrawable)
        .showImageForEmptyUri(bitmapDrawable)
        .build()

As you can see, I am setting the bitmap drawable not only as image when loading, but as image when fails too (as we don't want that image to change in case of error while loading the better image from an url). The result of that is that the bitmap drawable is never shown. What are we doing wrong?

UPDATE: After debugging what was happening I've seen that the problem is not the bitmap drawable, it is supported and working fine. The problem was that I am using a default display options builder (mDisplayImageOptionsDefaultBuilder), than at some point did:

final DisplayImageOptions imageOptions = mDisplayImageOptionsDefaultBuilder.
        .showImageOnLoading(loadingResource)
        .showImageOnFail(errorResource)
        .showImageForEmptyUri(errorResource)
        .build()

So there's a bug in Universal Image Loader, because now I'm creating a display image options with:

.showImageOnLoading(bitmapDrawable)

Another "solution" is do:

final DisplayImageOptions imageOptions = mDisplayImageOptionsDefaultBuilder.
        .showImageOnLoading(0)
        .showImageOnLoading(loadingResource)
        .showImageOnFail(errorResource)
        .showImageForEmptyUri(errorResource)
        .build()

But internally it stores that there's a resource stored, so my drawable is not shown but the stored resource instead. Creating a new DisplayImageOptionsBuilder worked for me, but it would be nice that if the showImageOnLoading is set with a drawable, then the old resource was automatically cleared.

Thanks in advance.

Answer 1

UIL only supports the following schemes:

"h t t p://site.com/image.png" // from Web
"file:///mnt/sdcard/image.png" // from SD card
"file:///mnt/sdcard/video.mp4" // from SD card (video thumbnail)
"content://media/external/images/media/13" // from content provider
"content://media/external/video/media/13" // from content provider (video thumbnail)
"assets://image.png" // from assets
"drawable://" + R.drawable.img // from drawables (non-9patch images)

Use these schemes.

Answer 2

Universal Image Loader also provide to use the Background functionality.Please check the below coed for it:-

Here Uri is the path of the folder image OR the URL of the image.

imageLoader.loadImage(YOUR_URL, new SimpleImageLoadingListener() {
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
   super.onLoadingComplete(imageUri, view, loadedImage);
   layout.setBackgroundDrawable(new BitmapDrawable(loadedImage));
  }
});