monline

In the latest version (v1.4.0) of baksmali the process has been greatly simplified:

Eg. to deodex the Google Services Framework system app (from Jelly Bean), you can do the following:

1. First of all, fetch the dependencies: apktool and baksmali
2. Copy the /system/app/GoogleServicesFramework.apk and /system/app/GoogleServicesFramework.odex files (and the /system/framework folder) to your computer.
3. Initialize apktool using the downloaded framework folder:
   
   apktool if framework/framework-res.apk
4. Unpack the contents of the target app's APK using apktool:
   
   apktool d GoogleServicesFramework.apk GoogleServicesFramework
5. Read the API level of the APK using aapt (which is a helper app for apktool):
   
   aapt d badging GoogleServicesFramework.apk | grep targetSdkVersion
6. Disassemble the contents of the ODEX using baksmali (specify the correct API level with -a):
   
   baksmali -a 16 -x GoogleServicesFramework.odex -d framework -o GoogleServicesFramework/smali
7. Repackage into an APK:
   
   apktool b GoogleServicesFramework GoogleServicesFramework-deodexed.apk
8. Optionally sign the package (with a key named "my_key" using the my-release-key.keystore file for keystore):
   
   jarsigner -sigalg MD5withRSA -digestalg SHA1 -keystore my-release-key.keystore GoogleServicesFramework-deodexed.apk my_key
   (jarsigner is part of the Oracle JDK)
9. Optionally run zipalign to give the APK the finishing touches:
   
   zipalign 4 GoogleServicesFramework-deodexed.apk GoogleServicesFramework-deodexed-aligned.apk
   (zipalign is part of the Android SDK)

P.S.: if you want to know what an odex file is and what deodexing means, read this short guide