Theme Question

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I've been playing around with the theme engine on CM9 nightlies and want to tweak one of the existing theme apks from the market for my own use, specifically the purple holo. I've been trying to integrate yellow into it for a schnazy purple/yellow theme starting with the dialer.

So here's the snag: I have no errors nor problems decompiling the theme apk. I go into the drawable file(s) (hdpi, mdpi and I believe xhdpi) and copy the dialer icons and proceed to edit them in gimp, changing them to yellow. I save them as .pngs. and then drop them back into their respected drawable folders.

Now I recompile, again, no errors or problems. Sign the apk and then push it to my phone. It installs just fine. HOWEVER when I go to switch to the theme via the integrated theme engine I states that it was not compiled properly and to contact the author.

So what am I missing? Do I actually need to edit an XML or something? I never changed any names or locations of any of the files. I'm new to themeing and trying to started on personal projects, maybe one day create my own from scratch. Any help from all you masters out there would be appreciated.

Sent from my Galaxy Nexus

Edited to include a market link of the theme I'm trying to alter:
https://play.google.com/store/apps/d...a.theme.Purple