Hello, I hope it's acceptable to drag up such an old topic, but it exactly mirrors my problem.
I realise it's not the end of the world, but I'm finding it INCREDIBLY annoying that I can't work out what's going wrong.
Basically, when I first transferred all my music from PC to my Android phone I had quite a lot of missing cover art and I had to work out a method to get it all sorted.
I'll run through that first, as others might find it useful...
First, I decided to ensure that the art is embedded in every mp3 file, I don't trust any "album art" files or folders that other programs such as iTunes have created.
To do that, I actually do use iTunes (even though Apple have made it as awkward as possible with every software update!).
1. With the chosen album showing in iTunes "songs" view, I click and drag to select every track in the album.
2. I then right click and select "Clear downloaded artwork" from the pop-up menu.
3. I then download the artwork from anywhere on the web, trying to find a small version or if I can't I quickly create one - around 60x60 pixels is good enough for my purposes, you might want it bigger for an Android tablet.
4. Next, I right click on all the tracks again in iTunes and select "Get info", you'll see a small "artwork" box on the first tab. (For some daft reason, that doesn't appear if you only select ONE track).
5. Finally I drag the cover art file I downloaded into that box (from a windows Explorer window into the iTunes window).
When you do that, you should see iTunes working and if you have the "size" column displayed, you may see it get a bit bigger for each track as the art gets embedded.
As a secondary check, I use a program called "mp3Tag" to prove to myself that the art is actually embedded into every track file.
SO, that's my solution and it works well 99% of the time.
But now my tale of woe.
I'm left with just ONE album that simply REFUSES to show it's artwork on the Android phone.
It's fine on the PC in every program I've used
I've tried deleting the art and embedding the cover from a DIFFERENT album which does work with that album
I've tried deleting the whole album and re-importing it from the PC.
I've tried deleting it on the PC and re-ripping it from the original CD
I've removed and replaced the cover art time and time again.
And finally I tried reformatting the SD card - no change.
Now you're probably about to say "Just download an app, that'll sort it", but I did that once before and it automatically ran through EVERY album I had and replaced a lot of the art I'd carefully prepared with stuff it found on the web that was WRONG (such as re-release or compilation covers when I'd used the originals. or US versions when I wanted the UK cover.
Also I shouldn't need an app. What' I'm doing should work.... I just want to know WHY it's not working on this one album, for my own sanity.