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I have this minor bug in my Walkman app. Although some songs display the correct album art, other songs display the wrong one. Have tried deleting all songs, clearing data for the Walkman app, restarting the phone and putting the songs back. Still, some songs got the wrong album art.
Did you try to download the album art again?
Checked with Album Art Grabber, no missing album art. Also checked it with MX Player, which got all album arts correct.
You can do it manually.
Save the album art picture you want from the net (Google Pic Search or whatever).
Go into Walkman app
Select Album and Play a song
Hit the picture of the album at the bottom of the screen (next to play controls)
Hit the "three dot" settings menu and hit "Edit Music Info"
Hit the album art pic and hit "select from album"
I could do that, but I have like more than a hundred songs and a lot of it displays the wrong album art. Plus, if I do fix everything, this could happen again if I add more songs. I hope I don't have to always do it manually. Every other player I tested displays the correct album art.
Most Album art was OK for me.
If you manually change for one song it will apply it to all in the album.
I have a few thousand songs and it didn't take long to change the few that were wrong.