If he's talking about the yahoo app, you need to decompile it with apk manager (google it if you don't have it already, 4.9 is the current version, I've heard that 4.7 is the local favorite), not your framework, but the app itself. Once you make your modifications and you go to recompile it, select yes for system app, yes to the next question. At the next prompt, go to the apk manager folder/keep, and delete the resources.arsc file. Then go back to the script and continue. The reason to delete that file is because when the layout, values and other folders are compiled, they turn into resources.arsc. once complete with compiling, compare the size with the original. If it matches or is VERY close, you are good. If not, grab the resources.arsc out of the 'unsignedYahooMessenger.apk', and replace the one in the 'YahooMessenger.apk' you downloaded. No need to unzip/decompile it, just open with WinRAR or a comparable program, and drop it in. If the one you outputted is ok, sign it, rename it from 'signedYahooMessenger.apk' to 'YahooMessenger.apk' and drop it into an update.zip and install.
Sorry if I'm telling you a lot that you already know, just putting it all out there. Cheers, and good luck!
Sent from 1885
EDIT: Posts like this are why I never want to give up having a physical keyboard... although my thumbs are pretty sore now!