I have discovered how to get an InputStream object from a Uri pointing
to an image stored on the SD card!!!
Since the method to do this was not straight forward to me, I would
like to share it so that others may not suffer like I did.
A ContentResolver is the thing needed, but it is an abstract class.
The "trick" it would seem, is to call getContentResolver() from your
activity or service like this:
Uri imgUri = "content://media/external/images/media/92";
InputStream in = getContentResolver().openInputStream(imgUri);
I hope that helps someone.
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