@Override
    protected ParcelFileDescriptor loadResource(Uri uri, ContentResolver contentResolver) throws FileNotFoundException {
        return contentResolver.openAssetFileDescriptor(uri, "r").getParcelFileDescriptor();
    }
Fetches an {@link ParcelFileDescriptor} for a local {@link Uri}.
core/src/main/java/com/bumptech/glide/load/data/FileDescriptorLocalUriFetcher.java