I will like some clarifications around thumbnails:

1. Whose responsibility is it to generate thumbnails - the android OS
or the application developer?

2. If it is that of android OS - Can you please explain when the
thumbnail generation happens and whether it is possible to have images
on my SD card that don't have thumbnails generated for them.

3. It seems there are thumbnails of two kinds - micro and mini - most
probably this distinction is based on the size of the thumbnail. Which
one of these is generated? Are both always generated?

4. I am using a gallery to display all thumbnails.
managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
null, null, null, null);
Will I end up showing duplicates? - As of now I find this doesn't
result in duplicates appearing in my Gallery.
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