Have you found a way to benefit from the MINI_THUMB_MAGIC column without doing a second query to access the thumbnails?
On Saturday, January 2, 2010 12:06:54 PM UTC-8, CaptainSpam wrote: > > In an app I'm developing, I have a need to list the images stored on > the device in a Gallery widget. In a base sense, I've got that much > working; I can get thumbnails of everything via a query on > MediaStore.Images.Thumbnails, display them using an ImageAdapter, and > get the corresponding image IDs so I can retrieve the correct image > from MediaStore.Images.Media when the user selects it. That's all > fine and good. > > The problem, however, is that I want this image list sorted first by > bucket (and, for convenience, make sure Camera comes first), then by > the date the image was taken (or, failing that, when the image was > added). Where this comes into a problem is that I can't query on > these parameters when using MediaStore.Images.Thumbnails, and I don't > think it's possible to do an SQL JOIN between two content providers > (which makes sense, really) so I can match up thumbnail IDs to image > IDs. So, I can't directly get the thumbnails if I'm querying by > MediaStore.Images.Media, is what I'm saying. > > Looking over the docs, I'm noticing that MINI_THUMB_MAGIC is a part of > MediaStore.Images.Media (inherited from ImageColumns), and that it > should, if I'm understanding it right, give me the mini-sized > thumbnail ID for the specified image. However, when I look that value > up, I get a massive, 64-bit value (in this case, 4159546474444162379) > that, while it appears to be consistent in that the same image keeps > giving the same value, doesn't appear to be accepted by the thumbnail > content provider (it just tells me that the image can't be found). > > So what I'm asking is, how do I use > MediaStore.Images.Media.MINI_THUMB_MAGIC to get a thumbnail, if I > can? I can think of a way around this involving a second query every > time I want a thumbnail (ask the thumbnail content provider to look up > the thumbnail ID given a specific IMAGE_ID and indicating I only want > the mini thumbnail), but that seems horribly inefficient for something > like this. > > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
