Okay, download two files from here and here (actually wait a minute for it to upload), and then type in command prompt:
apktool if [file location]
And do that for both files. For example:
apktool if D:\SemcMusic.apk
apktool if D:\SemcGenericUxpRes.apk
And then you can use "d" to decompile files.
After editing the xml files, use "b" command to build.
Then, open .apk file from "dist" folder and copy the edited files to original .apk
Then move it to /system/app and edit permissions to 644 and you can run it.
I'm creating batch file to automate process with ADB.
And it's works? I tried it, but after recomplie i got Package Verification error... I said that
By the way, if you want to edit values/dimens.xml, you will not found in the edited apk from the dist folder. It's recomplie into resources.arsc, so you need to change this too, but if you change it, you will got an error, like me.